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Conferences  

Speakers

Prof. Detlef

Prof. Ahmad Fauzi Bin Ismail

______________________________________________________

Ph.D, D.P.S.M., FASc., CEng, FIChemE, P.Tech

Professor Ahmad Fauzi Ismail is the Deputy Vice Chancellor (Research & Innovation), Universiti Teknologi Malaysia. He is the Founding Director of Advanced Membrane Technology Research Center (AMTEC), Universiti Teknologi Malaysia (UTM). Prof. Fauzi graduated with a B.Eng. (Petroleum Engineering) and M.Sc. in (Chemical Engineering) from Universiti Teknologi Malaysia (UTM). He has awarded the Commonwealth Academic Staff Scholarship to pursue his Ph.D. in Chemical and Process Engineering at University of Strathclyde, Glasgow, UK, specializing in Membrane Manufacturing Technology. He has completed his PhD study in less than three years. He is the author of over 900 papers in refereed journals and over 50 book chapters. He has authored or co-authored 6 books and edited or co-edited 11 books, 9 Patents granted and 21 Patents pending.

His current Scopus h-index 79 (Citation 28,871) & Web of Science h-index 75 (Citation 25,731). He has supervised 56 PhD and 51 MSc students to completion as well as having supervised 10 post-doctoral fellows. He received more than 130 awards both at National and International level. Among the prestigious awards won are The World Academy of Sciences (TWAS) Prize in Engineering Sciences for 2019, Merdeka Award for the Outstanding Scholastic Achievement Category on 4th September 2014, three times Malaysia’s Rising Star Award by Clarivate Analytics (2016, 2017, 2018). He has been awarded Malaysia Young Scientist Award in 2000; ASEAN Young Scientist Award in 2001. He also won National Academic Award (Innovation and Product Commercialization Category) in August 2013 and Malaysian Toray Science and Technology Foundation Award, on 28 November 2013. He has been named as one of Most Cited Researchers in the world by Shanghai Ranking's Global Ranking of Academic in Chemical Engineering 2016. In 2004, The Cambridge Biographical Centre, Cambridge, England has listed him in the 2000 Outstanding Scientist of the 21th Century. In August 2006, he was awarded the British Chevening Royal Society Fellowship and was the only candidate being awarded by The British Council in that year. In August 1999, he was conferred a Gold Medal Discovery Award by UTM which had been presented by the Prime Minister Tun Dr. Mahathir Mohammad.

Prof. Fauzi served as the Chief Editor (Water Treatment and Desalination), Emergent Materials Journal; Engineering Editor for The Arabian Journal for Science and Engineering (AJSE) Journal; Advisory Board Qatar University Press 2019, Advisory Board Members for Desalination Journal, Journal of Chemical Technology and Biotechnology and Journal of Membrane Science and Research; Editorial Board Members for Membranes 2020, Separation and Purification Technology Journal, Journal of Membrane Water Treatment, Carbon Resources Conversion Journal, Jurnal Teknologi, Journal of Membrane and Separation Technology; Biofuel Research Journal, Journal of Rubber Research and Editor-in Chief for Journal of Applied Membrane Science & Technology and International Evaluation Panel member University of Hradec Kralove (UHK), Czech Republic. Prof. Fauzi’s research focuses on the development of polymeric, inorganic and mixed matrix membranes for water desalination, waste water treatment, gas separation processes, membrane for fuel cell applications, palm oil refining, haemodialysis membrane and smart optical fiber for tracking migration of oil flow. He also led a team of researchers and professional service teams who have secured research grant at national and international levels amounting about RM60 millions in total.

Prof. Fauzi has more than 27 years integrated combination experience in the academic and research environment. Throughout these years, he has played multiple roles as a lecturer, a researcher and an administrator. During his tenure as Deputy Vice-Chancellor (Research and Innovation) (DVCR&I) of UTM (from 2015 - present), he has made significant changes in the University's financial management by ensuring all financial units under the office of DVCRI office have full compliance to the Financial regulation of the university. Some of the proactive actions taken include ensuring the closure and updates of trust funds in all Centers of Excellence.

The implementation has been successfully made within 6 months without negative trust declaration. Going through various levels of academic services, his career aspiration is to promote transformation and translation of the innovations created in universities for the benefits of society, industries and wealth creation for our country in general. He genuinely believed that universities are transformative platform for the talents. Therefore, one of his lifetime privileges is to nurture the young generations through empowerment and inspiration. His aspires to help the young generation to envision potential and successes by building a shared vision, creating mental models and fostering team learning.

Ahmad Fauzi Ismail1, Pei Sean Goh1, Takeshi Matsuura2

Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia

Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa

Many parts of the world is facing severe water shortage issues. With the increasing pressure on reliable fresh water supply, desalination is known as one of the most sustainable approaches to provide fresh water to address this alarming issue. Both membrane-based and thermal-based desalination processes have attracted equal attentions due to their respective advantages to produce fresh water. Over the last decades, various strategies including development novel materials and emerging desalination processes have been attempted to fulfil the increasing needs for fresh water.

Constant research efforts have been made to seek more innovative ways to efficiently and reliably supply potable water through desalination. In terms of material development, innovative functional or hybrid materials have been extensively investigated for the development of membranes or electrodes to enhance the desalination performances. In view of the dramatic environmental concerns, desalination system has also been improved to enhance the energy efficiency and separation efficiencies. Integrated desalination processes and renewable energy-driven desalination processes have been widely studied to achieve these purposes.

This presentation first provides an overview on the recent progresses made in the field of desalination including two major aspects, i.e. emerging desalination processes and advancement of functional materials to heighten the performances of desalination processes. The current efforts made in achieving highly sustainable desalination processes are discussed. Finally, the future perspective and research directions are highlighted.

 

Prof. Thomas

Prof. G.Arthanareeswaran

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Group Leader, Membrane Research Laboratory

Professor, Department of Chemical Engineering

Education

G. Arthanareeswaran graduated Chemical Engineering in CIT, Coimbatore, India. He completed his Master Degree in petroleum refining and petrochemicals and defended his PhD thesis at the Anna University, Chennai, India. In 2001, he obtained teaching and research associate from Anna University for four years. G. Arthanareeswaran stayed for four years at Anna University where he studied development and application of membranes.

Experience

In 2005, he was appointed Lecturer at the Chemical Engineering department, Anna University, Chennai. Then, he moved to Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli in the year 2007 and continued his teaching and research as Lecturer in NIT-Trichy. Now, He is working as Professor in the same department. His research interest involves development of polymer membranes for Energy and Environmental applications

Award and achievements

He has received Research exchange award from the Royal Academy of Engineering (RAE) London in 2010, Endeavour Executive award from Australian Government, Hiyoshi Environmental Award 2017 from Japan for outstanding Research in the field of Environmental conservation. He received Brain Pool Award from South Korea in the world in the year 2016 and 2019.

Visiting Academic Position

He is served various university visiting professor appointment form Australia, UK, Brazil, Malaysia, Hungary, Thailand and South Korea.

Sponsored Research Projects

He has been the principal Investigator for many sponsored research projects funded by DST, DBT, CNPq, Brazil, MST, Korea and RAE,UK, ASEAN India Fund, NRDI, Hungary.

Collaborations and Network

He is also collaborating research Institution like Loughbourgh University-UK, Monash university- Australia, University of Sao Carlous-Brazil, Universiti Teknologi Malaysia-Malaysia, Konkuk University-South Korea, University of Szeged-Hungary, PSU-Thailand, UMP-Indonesia.

Membership

He is Executive member of Indian Membrane society and life member of Indian Institute of Chemical Engineers.

Publications Synopsis

Arthanareeswaran has authored over 135 original and review articles in peer review international journals and 2 books, 7 book chapters and presented around 50 research findings in international conferences. His research work widely cited with nearly 2740 citations. The current relevance/importance of research work from google scholar citation report:

H-indexi10-indexCitations
All Time 28 62 2740
Since 2015 26 55 1992

Research Guidence

Post graduate thesis guidance: 30 Completed, 2 progress

Ph.D. Thesis guidance: 5 Completed, 9 progress

Editorial Board

He Served as Gust Editor in Desalination, Membrane and water treatment journal. Associate Editor in Ecotoxicology and Environmental Safety, Pharmaceutics. He is an Editorial Board of Journal of Applied Membrane Science & Technology, UTM press, Journal of Membrane and Separation Technology lifescienceglobal. Associate Editor, Emergent Materials, Springer Nature Switzerland AG

Keynote and invited talks

He presented key note and invited talk in international conference, workshop and seminar in ASEAN Membrane Society Conferences, Indian membrane Society conferences, Water conference in UK, Malaysia, Germany, Indonesia, Hungary, Thailand and South Korea.

G. Arthanareeswaran

Professor, Department of Chemical Engineering

Email: arthanaree10@yahoo.com

Pressure driven membrane separation processes such as nanofiltration (UF) and forward osmosis is widely utilized in the removal of various contaminants from wastewater and extensively applied in industrial applications for process. Metal organic framework (MOF) materials has been emerged as one potential materials for modification or alter membrane materials for the removal of specific contaminants from water and wastewater by mixed matrix concepts. The mixed matrix membrane is a developing technology which provides compactness, energy efficient, economic and environmental friendly.

The MOFs of hybrid materials have been used as fillers to prepare composite membranes with various polymers such as polysulfone (PSF), Polyethersulfone (PES). The interfacial compatibility between the fillers and polymer matrix is an important factor in obtaining high separation efficiency. MOF act as organic and inorganic linkers to enhance the selectivity, tenable property. The mixed matrix membranes (MMM) were efficient applied for the removal of heavy metal ions from wastewater, efficient organic dye removal from wastewater, desalination. Some of the water-soluble MOF nanoparticles were also used to modify polymer membrane for improving flux and molecular retention. The functionalized MOFs successfully applied for metal ion removal especially Pb (II) removal.

The antifouling properties, membrane hydrophilicity were improved by addition of MOFs and suitable for applications in the water purification field. The MOFs based MMM are having an excellent membrane separation performance due to the large pore system, hydrophilic nature, antifouling property and layout free of MOF agglomerates, therefore facilitating an effective transport and high rejection.

 

Prof. Enrico

Dr. Dong Suk Han

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PhD from Texas A&M University-College Station

Research Associate Professor at the Center for Advanced Materials (CAM) of Qatar University (QU)

Dr. Dong Suk Han is Research Associate Professor at the Center for Advanced Materials (CAM) of Qatar University (QU). Dr. Han received a PhD from Texas A&M University-College Station, the United States in 2009. He has over 20 years of experience in development of Water Environment and Energy Technology using nanomaterials and environmental physical/chemical technologies such as adsorption/membrane separation, (Photo) electrochemistry, and advanced oxidation/reduction process. Currently, Dr. Han is one of the founding members who established Water Technology Unit (WTU) under the CAM with financial support from Qatar Electricity and Water Company (QEWC) and Qatar University. He has been serving as Journal Reviewer Editor for Frontiers in Chemistry (Impact factor of 3.994) in electrochemistry section, editorial board member of Current Graphene Science, and is also participating in guest editor on special issue topic for Resource Recovery in Desalination journal (Impact factor of 7.098).

Until now, he was awarded the graduate student research grant from Texas Water Research Institute (TWRI) through U.S. Geological Survey (USGS) in 2006, C. Ellen Gonter Environmental Chemistry Paper Award in 2009 at American Chemical Society (ACS), and Research Fellow Excellency Award and Research Team Excellency Award at Texas A&M University at Qatar both in 2012. His research has been supported by National Research Foundation of Korea (NRF-K), U.S. Department of Energy (US DOE), U.S. Geological Survey (USGS), and Qatar National Research Foundation (QNRF). Regarding QNRF grant, he awarded 5 National Priorities Research Program (NPRP) grants (total ~4M US$) as key investigators, studying on CO2 conversion with integrated desalination and (photo)electrochemical technologies, water-energy-food nexus technology, microbial desalination cell, reactive adsorbent material for toxic metal removal in a continuous contact system, and lithium recovery from seawater reverse osmosis (SWRO) process using a flow-through electrochemical capturing system.

Dong Suk Han

Central Role of Water for Qatar’s Multi-Integrated Security

In recent years, Qatar has been making great efforts to secure water, energy, food, and the environment for Qatar society as well as for global community. Being able to secure such a variety of security at once is at the center of being able to secure a safe and sufficient amount of high water quality from seawater desalination.

Compared to the past, extreme climate change has led to water shortages and food shortages threatening our society in many parts of the world, and unpredictable natural disasters due to sea level changes are a stage where we cannot predict how our future society will be affected. In this regard, countries that produce large amounts of gas and oil, such as Qatar, should focus on energy security strategies that can reduce CO2 emissions, a major contributor to climate change. In this context, the reliable water quality secured by low energy consumption or renewable energy is expected to help society become healthier by providing healthy food and high air quality. In addition, these integrated securities are becoming more and more imperative in the current COVID-19 pandemic, which increasingly demands stronger immunity from humans. This talk will provide an overview of what has been mentioned above and shows what kind of research activity is currently contributing to these things.

 

Prof. Barcelo

Prof. Aziz AMINE

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Professor of biochemistry at the Faculty of Sciences and Techniques

Prof. Aziz AMINE is a Professor of biochemistry at the Faculty of Sciences and Techniques of Hassan II University of Casablanca (Morocco). He received PhD degree from the Free University of Brussels in 1993. Professor Amine’s research over the last 30 years has focused on Sensors, Biosensors, and their use in analytical chemistry. He is the author of more than 170 papers and his H-index of 49. He has served as coordinator of several national and international research projects and actually, he is one of the Editors of the journals Biosensors & Bioelectronics (Elsevier) and Chemistry for Africa (Springer).

https://scholar.google.com/citations?hl=en&user=yycHU3UAAAAJ&view_op=list_works&sortby=pubdate

Aziz Amine

Electrochemical Applications of Sensors and Biosensors Based on Laser Scribed Graphene Electrodes

Laser-derived graphene (LDG) technology is attracting attention as a promising material for the development of new electrochemical sensors and biosensors (1,2). Indeed, LDG has many advantages such as good electrical conductivity, porosity, mechanical stability, and large surface area. LDG technology was introduced for the easy, mask-free, and low-cost production of graphene-based materials. It is based on laser-induced scribing of various kinds of substrates, preferably of polyimides (PI), to produce graphene layers.

The laser irradiation of the PI sheet using a photothermal process leads to the production of the LSG sensors. The CO2 laser irradiation allows the rearrangement of the aromatic compounds of the PI into a graphene-like structures. The products are now mainly termed laser-scribed graphene (LSG).

Several biomolecules were tested for their electroactivity. The LSG electrodes showed a significant enhancement in the electrochemical performances of all these analytes in respect to the conventional electrodes. The figure bellow indicates that the electron transfer process for paracetamol(PCM) at the LSGE is significantly improved and becomes faster with a lower ΔEp of 88 instead of 384 and 440 mV at screen printed electrodes and glassy carbon electrodes respectively.

In this presentation, I will focus on the electronalytical performances of LDG sensors and biosensors. Taking into account that LDG technology for electrochemical sensors and biosensors fabrication is still at its infancy, it paves the way for more applications in flexible and wearable devices.

Prof. Barcelo

Refrences:

Laser scribed graphene: A novel platform for highly sensitive detection of electroactive biomolecules Abdelghani Ghanam, Abdellatif Ait Lahcen, Tutku Beduk, Husam N. Alshareef, Aziz Amine, Khaled Nabil Salama. Biosensors and Bioelectronics 168 (2020) 112509, doi.org/10.1016/j.bios.2020.112509

Electrochemical sensors and biosensors using laser-derived graphene: A comprehensive review Abdellatif Ait Lahcen, Sakandar Rauf, Tutku Beduk, Ceren Durmus, Abdulrahman Aljedaibi, Suna Timur, Husam N. Alshareef, Aziz Amine, Otto S. Wolfbeis, Khaled N. Salama. Biosensors and Bioelectronics 168 (2020) 112565, doi.org/10.1016/j.bios.2020.112565

 

Prof. Roger

Prof. Igor Krupa

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Research associate professor and Qatar Petrochemical Company (QAPCO)

Polymer Chair at the Center for Advanced Materials, QU

Dr. Igor Krupa is the research associate professor and Qatar Petrochemical Company (QAPCO) Polymer Chair at the Center for Advanced Materials, QU. His research interest includes polymeric blends and composites, electrically and thermally conductive composites, membranes, phase change materials, sol-gel technology and modifications of polymeric surfaces. As an Industrial company Chair, he has long experience with the industry, specifically polymers and chemical modifications of materials. His current research is mostly focused on the water treatment of polluted water. He is the author or co-author of 130 scientific papers in peer-reviewed journals, six chapters in books and one patent. Dr. Krupa had led and participated in many national and international research projects in the field of polymers, nanotechnology and composites.

Dr. Igor Krupa

Preparation, properties and applications of polymeric nanocomposites based on the MXene

MXenes are a relatively new family of (2D) transition metal carbides, nitrides or carbonitrides, produced by the selective chemical etching of “A” from MAX-phases, where M is a transition metal, A is a group IIIA or IVA element and X is C or N, first reported in 2011 by the Gogotsi and Barsoum groups [1]. These materials have received tremendous attention from the scientific community due to their excellent physiochemical properties, electrical conductivity and hydrophilicity [2].

Herein, we report the preparation and properties of electrically conductive, transparent and flexible polymeric composites based on MXene-filled co-polyamide that were prepared by a simple casting method to form self-standing films. The electrical conductivity of as-prepared MXene was 9.1 S·cm–1, and the electrical conductivity of the MAX-phase was 172 S·cm–1. The percolation threshold of the MXene filler within the coPA matrix was found to be 0.005 vol.%, and the highest determined electrical conductivity was 1.4×10-2 S·cm-1 for the composite filled with 5 wt.% (1.8 vol.%) of the MXene.

The transparency of the prepared films exceeded 75%, even for samples containing 5 wt% of MXene, as confirmed by UV spectroscopy. Moreover, all the composite films are highly flexible and do not break under repeated twisting. The combination of the relatively high electrical conductivity of the composites with low filler content, appropriate transparency, and good mechanical properties make these materials promising for various applications such as flexible electronics.

Prof. Barcelo

Figure 1: Connection of coPA film containing 5 wt% into electrical circuit. B) coPA film containing 5 wt% of MXene wrapped around pencil.

Furthermore, MXene particles were used for modification of membrane surface for vegetable oil/water separation by casting MXene particles onto coPA electrospun membranes. Contact angle of oil under water showed superoleophobic properties of prepared membranes for multi-layered as well as few-layered MXene, up to 152º. Prepared membranes exhibited separation efficiency up to 99% while having high flux up to 11 000 L/m2h at pressure 0.5 bar.

Acknowledgements

This work was supported by the Qatar University Collaborative Grant QUCG-CAM-19/20-2.

References

M. Naguib, M. Kurtoglu, V. Presser, J. Lu, J. Niu, M. Heon, L. Hultman, Y. Gogotsi, M.W, Barsoum, Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2. Adv. Mater. 23 (2011) 4248–4253.

M. Naguib, O. Mashtalir, J. Carle, V. Presser, J. Lu, L. Hultman, Y. Gogotsi and M.W. Barsoum, Two-Dimensional Transition Metal Carbides, ACS Nano 6 (2012) 1322–1331.

 

Prof. Munir

Prof. Jose L.

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Professor and Head of Functional Surfaces and Coatings

Prof. Jose L. is currently Ikerbasque Professor and Head of Functional Surfaces and Coatings. He carried out his doctoral studies in Mechanical Engineering at the University of New Hampshire (USA) on the impact of coating architecture on the hardness, friction and wear of nanocomposite tribological coatings. From 2014 to 2019, he has been the director of the Surface Engineering and Precision Institute (SEPI) at the University of Cranfield (United Kingdom) and co-Director of the Centre of Doctoral Training in Ultra-precision Engineering along with Cambridge University.

Previously he worked in the academic sector (at the Institute of Materials Science of Madrid and the Lawrence Berkeley National Laboratory), in the industrial sector of renewable energies at Abengoa Research and in the field of tool materials and coatings at the company Oerlikon Balzers in Liechtenstein. He has published more than 100 scientific articles and has been inventor of more than 24 national and international patent applications in new materials and coatings for solar energy, catalysis and tools. He has been the main organizer of several international conferences and symposiums in the field of surface engineering and has acted as associate editor of several international scientific journals. He has supervised postgraduate students from many countries including Spain, Poland, United Kingdom, France, Nigeria, Kenia, Saudi Arabia, Pakistan Malaysia and China.

Prof. Jose L.

Surface Engineering: Stories behind the scenes

As an enabling technology, surface engineering affects almost every product around us by making them to be more long lasting, functional and productive. Despite the numerous positive benefits of our technology, far too little is sometimes known in our society about how surfaces are researched and engineered. In some rare occasions, science fiction, films, games and other digital works have unintentionally portrayed some of the recent materials science advances related to this field.

This lecture will emphasise the societal importance of the surface engineering sector, show scenes from seven occasions in which the materials science of coatings and thin films was brought to a large audience, explain with published examples the close relation between coatings materials research and the scenes displayed.

 

Prof. Munir

Dr. Samrana Kazim

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Doctoral degree (Ph.D.) in Materials chemistry

Leader at Basque Centre for Materials

Dr. Samrana Kazim is an Ikerbasque fellow & group leader at Basque Centre for Materials, Applications and Nanostructures. Prior to this, she has worked as a tenured senior scientist (2013-2017), at Abengoa Research, a corporate research centre of multinational energy company in Spain. She obtained her doctoral degree (Ph.D.) in Materials chemistry. After finishing her Ph.D, she was briefly worked as a post-doc at Indian Institute of Technology (IIT Kanpur). Subsequently, she moved to Institute of Macromolecular Chemistry (IMC), Prague on IUPAC/UNESCO fellowship. From 2009-2013.

She worked as staff scientist at IMC Prague. She has authored over 60 research articles in reputed journals in the field of material science, nanotechnology and energy field; also authored and edited book chapters, and inventor of numerous patents in the field of energy conversion and storage. She is a fellow of young academy of Europe. Her field of research interest includes synthesis and electro-optical characterization of organic semiconductors, hybrid nanostructured materials for optoelectronics applications and perovskite solar cells.

Dr. Samrana Kazim

New approaches towards designing hole transporting layer for perovskite solar cells

Organo-metal halide perovskite absorber based thin film solar cells (PSCs) have shown the best performance due to their high defect tolerance nature and extraordinary opto-electrical properties. The power conversion efficiency (PCE) has dramatically jumped from merely 3.8% to 25.5% in a decade through compositional engineering of perovskite materials, design and optimization of charge selective contacts, deposition methods.

The use of a hole transport material (HTM) in perovskite solar cells is a prerequisite to transport holes efficiently from perovskite to the counter metal electrode and to achieve high power conversion efficiency.

Presently, among the organic hole transport materials (HTMs), Spiro-OMeTAD signifies the state of the art HTMs. However, the multistep synthesis, complex purification of this HTM impedes progress toward commercialization of perovskite PV technology. Thus to replace Spiro-OMeTAD as HTM, different types of new organic small molecules have been designed and implemented in various device architecture. In this talk, I will present our results on design engineering of small molecule based hole transport materials for perovskite solar cells, which can be synthesized in minimum synthetic steps without complex purification to make them cost competitive. Further, recently developed hydrophobic dopant will also be discussed to improve the performance as well as the long term stability.

 

Prof. Ranucci

Prof. Elisabetta Ranucci

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Professor of Polymer Chemistry at the University of Milan

Prof. Elisabetta Ranucci is full professor of Polymer Chemistry at the University of Milan, Italy. She earned her doctor degree in Chemistry from the University of Pisa and began her academic career as assistant professor at the University of Brescia, Italy. From 1998 to 2001 Elisabetta Ranucci was visiting professor at the Kunglig Tekniska Högskolan (KTH) in Stockholm, Department of Polymer Technology, where she acquired the title of Docent in Polymer Technology. She currently teaches courses of polymer chemistry for student of all degree levels in Industrial Chemistry, namely bachelor, master and PhD delivered by the University of Milan.

She has served as external referee of Start Grant and Consolidator Applications, European Research Council (ERC) calls from 2009 to 2016. She is currently referee for many peer-reviewed Journals in the field of polymer science. She is member of the Editorial Boards of the MDPI journal “Polymers” and of the Springer journal “Chemistry Africa”. She was the chair of the international Milan Polymer Days congress from 2017 to 2020. Her research interests focus on the synthesis, chemical modification, structural and thermal characterization of multifunctional polymers for special applications, such as biotechnology, water purification and flame retardancy.

Prof. Elisabetta Ranucci

Polyamidoamine nanovectors for controlled drug delivery

Polyamidoamines (PAAs) are multifunctional polymers prepared by the aza-Michael polyaddition of prim- or sec-amines with bisacrylamides. The reaction can be carried out at room temperature in water and with no added catalysts. The presence in the starting monomers of additional functions, such as thiols and phosphines, does not interfere with the polymerization process. PAAs are a polymer class endowed with unusual structural versatility. Many PAAs are remarkably biocompatible notwithstanding their polycationic nature. This allows to tailor-make them to prepare polymeric structures suitable for many different applications in nanomedicine, such as drug carriers, transfection promoters, antiviral and antimalarial agents, hydrogels scaffolds for tissue engineering. For instance, purposely devised PAAs are capable to give complexes with ruthenium, through trisphenanthroline pendants and to penetrate into cell nucleus of cancer cells (for instance HeLa cells) rendering them amenable to photodynamic therapy, a treatment of solid tumors consisting of the local administration of intrinsically harmless substances that, irradiated by a light of specific wavelength, become cytotoxic due to photoactivation.

A remarkable property of PAAs is to selectively enter Plasmodium-infected red blood cells (RBC), ignoring healthy RBC. They proved also able to solubilize and target antimalarial drugs, such as chloroquine, to the infected cells with no detectable adverse side effects. This dramatically increased the efficacy of this drug both in vitro and in vivo. Intraperitoneal administration of 0.8 mg/kg chloroquine combined with different PAAs, namely AGMA1 and ISA23, cured P. yoelii–infected mice, whereas control animals treated with twice as much free drug did not survive. The AGMA1 PAA, even in the absence of antimalarial drugs, showed a significant antimalarial activity. In particular it inhibited the in vitro growth of Plasmodium falciparum, with IC50 13.7 μM.

References

  • E. Ranucci, A. Manfredi, Chemistry Africa 2019, 2, 167-193.

  • L. Mascheroni, M.V. Dozzi, P. Ferruti, E. Ranucci, V. Francia, A. Salvati, D. Maggioni, Inorg. Chem. 2019, 58, 14586-14599.

  • P. Urbán, J.J. Valle-Delgado, N. Mauro, J. Marques, A. Manfredi, M. Rottmann, E. Ranucci, P. Ferruti P, X. Fernàndez-Busquets J. Contr. Release 2014, 177, 84-95.

 

Prof. Karim

Prof. Alamgir Karim

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Ph.D. in Physics from Northwestern University in Illinois

Prof. Alamgir Karim his Ph.D. in Physics from Northwestern University in Illinois in 1992. He did a post-doc in Chemical Engineering at University of Minnesota till 1993. He was Group Leaders of Polymer Blends, Combinatorial Methods and Nanomaterials Groups at NIST until 2008. From 2009-2017, he was Goodyear Chair Professor of Polymer Engineering, and Co-Director, Akron Functional Materials Center at University of Akron, and was Associate Dean of Research and Institute Director at College of Polymer Science and Polymer Engineering at University of Akron.

In Fall 2017, he joined Department of Chemical and Biomolecular Engineering at University of Houston (UH) as Dow Chair Professor, and Director of the Materials Program and Director of the International Polymer and Soft Matter Consortia (ICPSM). His areas of research include polymer nanotechnology of thin films, surfaces and interfaces related to energy, sustainability and human health. He has published over 220 papers and edited several books in these areas of polymer research, and organized several international conferences on these topics. He is a Fellow of the American Physical Society (APS) as well as Fellow of American Association for the Advancement of Science (AAAS) and recipient of Keck Foundation Award.

Prof. Alamgir Karim

Lamellar Block Copolymer Based High Energy Density Polymer Film Capacitors

Designing next-generation light-weight pulsed power devices hinges on understanding the factors influencing the energy storage performance of dielectric materials. Polymer dielectric films have a quadratic dependence of energy storage on the voltage breakdown strength and strategies to enhance the breakdown strength are expected to yield a path toward high energy storage densities. Highly stratified lamellar block copolymer (L-BCP) films of model polystyrene-b-polymethylmethacrylate (PS-b-PMMA) exhibited as much as ~50% enhancement in breakdown voltage (EBD), (225 % increase in stored energy density, U~ EBD2), compared to unordered as-cast L-BCP films. Such an energy density using amorphous polymer is on par with industry-standard semi-crystalline biaxially oriented polypropylene (BOPP), and as such a notable development in the field.

This work develops a deeper understanding of the molecular mechanisms of EBD enhancement in L-BCP films, relating EBD directly to molecular weight (Mn), with interpretation to effects of chain-end density and distribution, interface formation, layer thickness and their relative contributions. As-cast disordered L-BCP films show decreasing EBD with decreasing Mn similar to homopolymer studies due to increase of homogeneously distributed chain-ends in the film. EBD increases significantly in parallel ordered L-BCP films, due to combination of interface formation and spatial isolation of the chain ends into segregated zones.

We further confirm the role of chain ends in the breakdown process blending a low Mn L-BCP with matched Mn homopolymers to attain same layer spacing as neat L-BCP of higher Mn. EBD shows a significant decrease at low homopolymer fractions due to increased net chain end density within swollen ordered L-BCP domains in wet-brush regime, followed by increased EBD due to layer thickness increase via segregated “interphase layer” formation by excess homopolymers. These novel findings provide important selection rules for L-BCPs for designing next-generation flexible electronics with high energy density solid-state polymer BCP film capacitors.

 

Carla

Dr. Carla Vilela

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Ph.D., is an assistant researcher at CICECO – Aveiro Institute of Materials

Dr. Carla Vilela Ph.D., is an assistant researcher at CICECO – Aveiro Institute of Materials (Portugal) and her main research interest includes the sustainable use of biopolymers (e.g., nanocellulose, pullulan, chitosan, lysozyme) for the development of novel functional nanostructured materials for both technological (e.g., active packaging, fuel cells, water remediation) and biomedical (e.g., drug delivery, wound healing) applications. She is working in one of the most important Portuguese teams on the development and application of cellulose and other biopolymer-based materials (BioPol4fun Research Group – Innovation in BioPolymer based Functional Materials and Bioactive Compounds).

She is an Associate Editor of Chemistry Africa (Springer Nature), Editorial Board Member of Cogent Chemistry (Taylor & Francis Group) and Polysaccharides (MDPI), Topic Editor of Nanomaterials (MDPI), and a member of the European Polysaccharide Network of Excellence (EPNOE). CVilela is continuously teaching at the BSc and MSc level courses, namely Chemistry, Biotechnology, Chemical Engineering and Materials Engineering, at the University of Aveiro. She has already mentored and supervised 7 BSc, 7 MSc and 2 PhD Erasmus students, and 1 post-doctoral researcher, and her current research team includes 1 research fellow, 4 PhD and 3 MSc students. She is the author of 60 SCI papers (h-index: 21; citations: +1500 (SCOPUS)), 1 book, 5 book chapters, 2 datasets, 8 abstracts of papers of the American Chemical Society (ACS), 5 conference proceedings, and more than 75 communications in national and international conferences (ORCID: 0000-0002-9212-2704).

Dr. Carla Vilela

Sustainable use of biopolymers for the development of novel functional materials

The exploitation of biopolymers, such as polysaccharides and proteins, for the development of novel functional materials is a research field of increasing interest given the global concern for sustainability. Therefore, the present study describes the use of polysaccharides (e.g., nanocellulose, fucoidan, pullulan, hyaluronic acid) and proteins (e.g., lysozyme, gelatin) to engineer sustainable materials for application in multiple domains, such as active food packaging, water remediation, fuel cells, drug delivery, and wound healing. For example, the combination of bacterial nanocellulose with fucoidan originated robust conductive materials that can be applied as ion-exchange membranes in polymer electrolyte fuel cells (1).

The partnership between pullulan and extracts from agri-food by-products yielded robust flexible films with antibacterial and antioxidant properties for application as active food packaging materials (2). Dual nanofibrillar-based bio-sorbent films composed of nanocellulose and lysozyme nanofibrils can be explored in the removal of mercury from spring waters (3). Multifunctional nanofibrous patches with potential for cutaneous wound healing were prepared by blending nanofibrillated cellulose and lysozyme nanofibers (4). Lastly, microneedle patches for skin applications were fabricated from bacterial nanocellulose and hyaluronic acid (5).

REFERENCES

  • C. Vilela, A.C.Q. Silva, E.M. Domingues, G. Gonçalves, M.A. Martins, F.M.L. Figueiredo, S.A.O. Santos & C.S.R. Freire, Carbohydr. Polym., 2020, 230, 115604.

  • T. Esposito, N. H. C. S. Silva, A. Almeida, A. J. D. Silvestre, A. Piccinelli, R. P. Aquino, F. Sansone, T. Mencherini, C. Vilela & C. S. R. Freire, Ind. Crop. Prod., 2020, 151, 112491.

  • N. H. C. S. Silva, P. Figueira, E. Fabre, R. J. B. Pinto, M. E. Pereira, A. J. D. Silvestre, I. M. Marrucho, C. Vilela & C. S. R. Freire, Carbohydr. Polym., 2020, 238, 116210.

  • N.H.C.S. Silva, P. Garrido-Pascual, C. Moreirinha, A. Almeida, T. Palomares, A. Alonso-Varona, C. Vilela & C.S.R. Freire, Int. J. Biol. Macromol., 2020, 165, 1198–1210.

  • D.F.S. Fonseca, C. Vilela, R.J.B. Pinto, V. Bastos, H. Oliveira, J. Catarino, P. Faísca, C. Rosado, A.J.D. Silvestre & C.S.R. Freire, Mater. Sci. Eng. C, 2021, 118, 111350.

Acknowledgements: This work was developed within the scope of the project CICECO – Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020) financed by national funds through the Portuguese Foundation for Science and Technology (FCT)/MCTES. FCT is also acknowledged for the research contract under Scientific Employment Stimulus to C.V. (CEECIND/00263/2018).

 

Pavel

Dr. Pavel S. Postnikov

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Assoc. Prof. in Organic Chemistry

Assoc. Prof., Dr. Pavel S. Postnikov completed his doctorate in organic chemistry with the theoretical and practical insights in the diazonium chemistry at the Tomsk Polytechnic University in 2011. After he studied the preparation and reactivity of cationic organic species, especially hypervalent iodine compounds and diazonium salts, in the Tomsk Polytechnic University. This research sufficiently improved the synthetic tool-box for the preparation of valuable and merit building blocks for the organic synthesis. Recently, Dr. Postnikov moved to the design of new functional materials using the surface modification methods with active organic species in University of Chemistry and Technology in Prague. Dr. Postnikov is laureate of prestigious awards in Russian Federation.

Assoc. Prof., Dr. Pavel S. Postnikov

Modern aspects of diazonium and iodonium surface chemistry in design of smart materials

The development of novel smart materials with tunable surface properties can be considered as the main trend in the modern science and technology. The particular place in this field is occupied by the surface chemistry involving highly reactive heterocationic species. The application of organic reagents with predictable properties and reactivity makes possible to carefully control the surface properties and introduce the desired functional to the smart materials.

The lecture will be dedicated to the modern aspects of surface chemistry utilizing iodonium and diazonium salts. The chemistry of diazonium salts will be explored from the secondary transformation point of view, including their application for SERS and SPR sensor design. The iodonium salts, as more prone to spontaneous reduction, will be presented as unique reagents for the selective decoration of nanomaterials surfaces.

 

Babak

Dr. Babak Minofar

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Head of Center for Nanobiology and Structural Biology of Microbiology

Dr. Babak Minofar is the head of Center for Nanobiology and Structural Biology of Microbiology Institute of the Czech Academy of Sciences and instructor in department of chemistry, University of South Bohemia. He received his Ph.D. in 2007 in Charles University in Prague. Since 2007 he started his research in academy university center in Nové Hrady and since 2018 he become the head of Center for Nanobiology and Structural Biology. In 2010, he received JSPS fellowship from Japanese Society for Promotion of Science where he has done his research in the University of Kyushu in Fukuoka and University of Niigata in Niigata. He is founder of Visegrad Symposium on Structural Systems Biology in 2009. He is the organizer and co-organizer of this symposium in one of the Visegrad countries namely in Poland, Slovakia, Hungary and the Czech Republic. He is author and co-author of more than 45 peer-reviewed papers in scientific journals.

His research is mainly focused on studying the interaction of different biomolecule related materials in aqueous and non-aqueous media by computational methods such as molecular dynamics (MD) simulations. By applying MD and other molecular modelling methods, he studies the relationship between structure, dynamics and function of peptides, proteins, enzymes, lipid membranes dynamical changes in molecular level to reveal the mutual interactions in such complex systems. For material science based applications of molecular dynamics, he is interested in studying the interactions in carbon based materials such as graphene, graphene oxide, carbon nanotubes, metal and non-metal oxide surfaces, aggregation-Induced emission based materials for different applications namely gas adsorption, gas sensing in sensors, pollutants removal, catalysis, detection and imaging processes. In his research approach, he uses not only MD simulations but also other theoretical methods including quantum chemical and semi-empiric calculations.

Dr. Babak Minofar

Applications of Molecular Modeling in Material Science

By development and improvement of computers in many areas of science, molecular modeling based methods become vital part of many research and development process as a practical tool for majority of industries including pharmaceutical and materials based industries. Due to small investment, high performance and accurate results of molecular modelling based methods, many companies started to develop their own molecular modeling software where they can use them either to improve their products or improve the processes involving in the production. These methods successfully have been used in many industries such pharmaceutical companies, chemical, polymer, electronic and photonic, catalysts, process engineering and energy related companies.

By using molecular modeling, methods in material based industries, innovation and fast improvement of products by predicting the properties of products and design of new experiments can be achieved. Molecular modeling, which can be used in material science giving information in atomistic level, can be divided to several categories such as computational Quantum Chemistry (QM) calculations, Molecular Dynamics (MD), Monte Carlo methods and Mesoscale modeling such as Coarse-grained (CG) simulations.

Classical molecular dynamics (MD) simulation, based on solving the Newton equation of motion, is one of the computational methods, which can give very useful information of different interaction for material based science. Hydrophobic interactions, π - π stacking interactions, propensity to the air/water interface, propensity to solid/liquids, liquid/liquid where the weak van der Waals forces, hydrogen bonding and electrostatic interactions involved at the surface or the in the bulk materials can be analyzed by MD simulations. MD simulations can achieve understanding the interfacial properties, dissolution in the bulk, aggregations, and precipitation, surface and bulk adsorption in aqueous and non-aqueous solutions.

In this, talk briefly, the machinery of MD simulation will be introduced. After introduction of MD, some applications of MD simulation for gas adsorption at the surface of porphyrins with different functional groups and mechanism of aggregation-induced emission (AIE) of tetraphenylethene (TPE) derivatives in binary mixture of acetonitrile and water and interaction of thienothiophene derivative with CNT in THF will be explained in molecular level.

Babk Abs.

Interaction of thienothiophene derivative with CNT in THF.

 

Meetu

Dr. Meetu Bharti

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Assistant Professor, Department of Physics

Dr. Meetu Bharti recently, worked in the field of organic thermoelectrics for my Ph.D. In the present study, we have tried to investigate the feasibility of conducting polymers for thermoelectric applications. To have practical applications on curved hot surfaces, we synthesized conducting polymers based films on flexible substrates as well as in free-standing form, using drop-casting method and photo- as well as chemical-polymerization route. These films were characterized through many techniques. The work presents a lay-out regarding thermoelectric performances of various conducting polymers depending upon their specific structural and physico-chemical properties. From the results obtained as the outcome of the thesis, we have identified the (i) factors affecting thermoelectric performance; (ii) strategies required for improvement of the power factor (due to inherent low thermal conductivity); and (iii) challenges that still lie ahead; in the field of organic thermoelectrics.

A detailed analysis of electrical and thermal transport-mechanisms along with various processes such as stretching, controlled doping and addition of inorganic materials/carbon nanostructures, have been proposed for enhancement of the thermoelectric figure-of-merit. A few prototype thermoelectric power generators using substrate-adherent as well as free-standing films have also been demonstrated. Besides this, some of the experiments have also been focussed to synthesize stable n-type polymeric films.

  • Worked as a Visiting Researcher for three months at University of Tsukuba, Tsukuba, Japan, to carry out ESR studies on polymer films.

  • Also, worked as a research student in Bhabha Atomic Research Centre, Mumbai from July 2007 to January 2008 for M.Phil. Thesis on the project- "Synthesis, Isolation and Characterization of metal oxides nanomaterials (ZnO, CuO) and their applications in gas sensing".

Dr. Meetu Bharti

Flexible thermoelectrics through conducting polymers

Thermoelectricity using ambient heat to generate power shows great potential as an energy conversion technology, but the field still lacks wearable energy harvesting materials that would be ideal for self-powered wearable applications. For flexible thermoelectrics, the most common approaches are to use either fully organic thermoelectrics or inorganic/organic hybrids [1]. Our group has worked on organic thermoelectrics where we have investigated substrate-adherent and free-standing films of polymers as well as of their composites [2-7]. The present talk intends to focus on novel concepts and strategies that are being followed in the thermoelectric domain for developing materials that would be flexible, light weight, low cost, and room temperature operating. However, for an efficient thermoelectric material, a parameter known as thermoelectric figure-of-merit (ZT) should be high. ZT is given by α2σT/κ; therefore, at a particular operating temperature T, a high Seebeck coefficient (α), high electrical conductivity (σ) and low thermal conductivity (κ) are desirable to have high ZT.

Unfortunately, these three parameters α, σ and κ are interdependent and need to be optimized collectively to achieve a high thermoelectric efficiency [8]. Polymers’ ability to be doped to tune α, σ, κ; low intrinsic thermal conductivity; solution processability; and eco-friendliness make them attractive as thermoelectric materials. But, their use in practical applications is restricted due to their low tensile strength, low efficiency, and lack of stable n-type material as conventional thermoelectric devices need both p- and n-type of elements [9]. On the other hand, inorganic thermoelectric materials such as chalcogenides, clathrates, half-Heusler alloys, skutterudites, exhibit high ZT and have good mechanical strength but they lack flexibility and involve complex synthesis procedures [10].

Consequently, the composites of organic and inorganic materials that manifest combined advantages of both the materials are focussed now-a-days. An insulating polymer matrix will ensure facile solution processability along with flexibility while incorporated inorganic materials and/or carbon nanotubes (CNTs) having unique electronic, mechanical, thermal, and optoelectronic properties can provide the thermoelectric performance [11,12]. Moreover, polymers’ solution processability and ease of blending with inorganic materials allow facile manipulation of composite materials to generate flexible and conformable threads [13]. Recently, a research group at NW University has patented an innovative design of ‘self-supporting’ thermoelectric fabric capable of being wrapped around irregular or moving surfaces to tap their heat [14].

Device design and development is also a topic of world-wide research for practical thermoelectric applications. Furthermore, design of thermoelectric devices using only one type of thermoelements; roll-to-roll type architecture; and thermoelectric threads to be weaved into fabric; are some of the remarkable developments that promise to realize wearable energy harvesting.

References:

  • J. H. Bahk, H. Fang, K. Yazawa, A. Shakouri, Flexible thermoelectric materials and device optimization for wearable energy harvesting. J Mater Chem C 2015;10:1039-51.

  • M. Bharti, A. Singh, S. Samanta, D. K. Aswal, Conductive polymers for thermoelectric power generation. Progress in Materials Science 2018;93:270–310.

  • M. Bharti, A. Singh, A. K. Debnath, A. K. Chauhan, K. P. Muthe, S. K. Gupta, K. Marumoto, T. Mori, D. K. Aswal, Anionic Conduction Mediated Giant n-type Seebeck Coefficient in Doped Poly(3-hexylthiophene) Free-standing Films, https://doi.org/10.1016/j.mtphys.2020.100307

  • M. Bharti, A. Singh, B. P. Singh, S. R. Dhakate, G. Saini, S. Bhattacharya, A. K. Debnath, K. P. Muthe, D. K. Aswal, Free-standing flexible multiwalled carbon nanotubes paper for wearable thermoelectric power generator, Journal of Power Sources 2020;449:227493.

  • M. Bharti, A. Singh, G. Saini, S. Saha, A. Bohra, Y. Kaneko, A. K. Debnath, K. P. Muthe, K. Marumoto, D. K. Aswal , S. C. Gadkari, Boosting thermoelectric power factor of free-standing PEDOT:PSS films by incorporation of Bi0.5Sb1.5Te3 nanostructures, Journal of Power Sources 2019;435:226758

  • M. Bharti, P. Jha, A. Singh, A. K. Chauhan, S. Misra, M. Yamazoe, A. K. Debnath, K. Marumoto, K. P. Muthe, D. K. Aswal, Scalable free-standing polypyrrole films for wrist-band type flexible thermoelectric power generator, Energy 2019; 176:853-860.

  • M. Bharti, A. Singh, S. Samanta, A. K. Debnath, D. K. Aswal, K.P. Muthe, S. C. Gadkari, Flexo-green polypyrrole – Silver nanocomposite films for thermoelectric power generation, Energy Conversion and Management 2017;144:143-152.

  • G. J. Snyder, E. S. Toberer, Complex thermoelectric materials. Nat Mater 2008;7:105-114.

  • Y. Chen, Y. Zhao, Z. Liang, Solution processed organic thermoelectrics: towards flexible thermoelectric modules. Energy Environ Sci 2015;8:401-22.

  • J. H. We, S. J. Kim, B. J. Cho, Hybrid composite of screen-printed inorganic thermoelectric film and organic conducting polymer for flexible thermoelectric power generator. Energy 2014;73:506-12

  • B. Zhang, J. Sun, H. E. Katz, F. Fang, R. L. Opila, Promising thermoelectric properties of commercial PEDOT:PSS Materials and their Bi2Te3 powder composites. ACS Appl Mater Interfaces 2010;2:3170-8

  • C. Zhou and M. Grayson, Thermal Conductivity and Thermal Distribution in Superlattice Structures, in The Wonder of Nanotechnology: Quantum Optoelectronic Devices and Applications, M. Razeghi. L. Esaki, and K. von Klitzing, Eds., SPIE Press, Bellingham, WA, (2013) pp. 85-103.

  • J. A. Lee et al., Woven-Yarn Thermoelectric textiles, Adv. Mater. 2016;28:5038.

  • M. Grayson et. al., Flexible woven thermoelectric fabrics for thermal management, Patent pending, PCT/US19/21086 (2019).

 

Xiang

Prof. Dr. Xiang Wang

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Specialized in heterogeneous and environmental catalysis

Prof. Dr. Xiang Wang is currently appointed as a Ganjiang Distinguished Professor at College of Chemistry, Nanchang University. He got his Ph.D. in 1998 at Peking University, specialized in heterogeneous and environmental catalysis. Afterwards, he joined Northwestern University, Center for Catalysis and Surface Science, and University of Pennsylvania, Department of Chemical Engineering to do his postdoctoral research from 08/1998 to 09/2002. From 10/2002 to 03/2005, he was appointed as a research associate at Lehigh University, working on the application of various in-situ spectroscopic techniques to study the surfaces of solid oxide catalysts.

After completing his university work, he started his industrial career in the US, first in EverNu Technology, LLC, as a Senior Research Chemist from 04/2005 to 12/2007, and then as a Research Chemist in BASF Catalysts, LLC, from 01/2008 to 06/2010. In 07/2010, he was invited by Nanchang University to be a Ganjiang Distinguished Professor, research director of Industrial Catalysis and the director of the Key Lab of Environment and Energy Catalysis, Jiangxi Province. He is the Academic Committee Member of Chinese Chemical Society, Catalysis Division and Chinese Rare Earth Catalysis Committee. Currently, his researches focus on environmental protection, clean energy production catalysis, surface structural chemistry and catalytic structure-reactivity. Dr. Xiang Wang has published more than 160 peer reviewed papers, which have been cited about 3700 times. He has been authorized 1 US patent and 10 Chinese Invention Patents. Two of the patents have been industrialized.

Prof. Dr. Xiang Wang

Fabricating Novel Composite Oxide Compounds for Oxidative Coupling of Methane (OCM)

OCM reaction is one of the important routes for value-added transformation of methane, which has aroused much interest over past decades. At present, the large scale industrialization of this important reaction is still restricted by lacking catalysts having enough one-way C2 product yield. Therefore, with open thoughts to design novel kinds of efficient catalysts that can be operated at relatively lower temperature region, or can meet the minimum industrialization requirement is of great necessity.

Over recent years, we discovered that some A2B2O7 pyrochlore compounds, which owns bulk 8a oxygen vacancies, intrinsic alkalinity and high thermal stability, can match most of the active site requirements for a good OCM catalyst [1]. When studying La2B2O7 (B = Ti, Zr and Ce) compounds for OCM, we found that by decreasing the rA/rB radius ratio from La2Ti2O7 > La2Zr2O7 > La2Ce2O7, a monoclinic layered perovskite, ordered cubic pyrochlore or defective cubic fluorite phase can be formed in sequence, which induces the change of the surface alkalinity and the amount of active oxygen sites. As a consequence, the reaction performance of the catalysts follows the order of La2Ce2O7 > La2Zr2O7 > La2Ti2O7, testifying that the change of the crystalline structures impacts the reactivity of the catalysts eventually. To further confirm this, two La2Zr2O7 compounds with ordered cubic pyrochlore or defective cubic fluorite phase have also been intentionally designed and used for OCM. The catalyst with a cubic fluorite structure displays much better reaction performance than the one with a pyrochlore structure. More recently, we have constructed strontium stannate catalysts with different crystalline phases for OCM reaction. A Sr2SnO4 catalyst with a perovskite-like stack of mono-layered structure demonstrates the best reaction performance among all the samples.

It is concluded that that the abundance of surface alkaline sites and active electrophilic oxygen species is the major factor accounting for the OCM performance. In comparison with the State-of-the Art Mn/NaWO4/SiO2, La2Ce2O7 and La2Zr2O7 display much improved reaction performance below 750 oC. In addition, these catalysts possess potent resistance to sulfur and lead poisoning. By further tuning the chemical compositions, optimizing the preparation methods and adding certain additives, catalysts with low temperature OCM performance could be achieved. The structure-reactivity relationship of these metal oxide compounds have been systematically elucidated.

Keywords: OCM, Pyrochlore, Perovskite, Strontium stannate, Structure-reactivity

References

  • J. W. Xu, Y. Zhang, X.L. Xu, X.Z. Fang, R. Xi, Y.M. Liu, R. Zheng, X. Wang. ACS. Catal., 9 (2019) 4030.