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MSE Seminar Series: Richard G. Weiss
Friday, November 30, 2012
1:00 p.m.-2:00 p.m.
Room 2108 Chemical and Nuclear Engineering Bldg.
For More Information:
JoAnne Kagle
301 405 5240

Simple Molecules and Simple Chemistry Yield Complex Materials Through Self-Assembly: Applications from Art Conservation to Oil Spill Recovery to New Foods

Richard G. Weiss
Department of Chemistry
Georgetown University

Basic strategies will be described to produce a variety of soft materials, some of which can be interchanged between ionic and uncharged forms by simple chemical transformations and others that can be induced by addition of small molecular species. All of the systems depend on a form of self-assembly which is induced different stimuli. The strategies will be demonstrated by some of our recent approaches to self-assembling systems that rely on the addition or removal or small molecules (such as a neutral triatomic molecule1, CX2 where X = O or S). They will include the formation of reversible room-temperature ionic liquids from amidine/amine mixtures2, the transformation of low viscosity amino substituted polysiloxanes into very viscous liquids, gels, and rubbers3, and the design of gelators based upon the naturally occurring molecule, (R)-12-hydroxystearic acid, and the properties of their ambidextrous gels.4 In addition, applications of some gels to art conservation, to oil spill recovery, and to the food industry5 will be demonstrated.

1 Yu, T.; Cristiano, R.; Weiss, R. G. Chem. Soc. Rev. 2010, 39, 1435-1447.

2 (a) Yu, T.; Yamada, T.; Weiss, R. G. Chem. Mater. 2010, 22, 5492–5499.
(b) Yu, T.; Yamada, T.; Gaviola, G. C.; Weiss, R. G. Chem. Mater. 2008, 20, 5337-5344.

3 Yu, T.; Wakuda, K.; Blair, D. L.; Weiss, R. G. J. Phys. Chem. C 2009, 113, 11546-11553.

4 (a) Mallia, V. A.; George, M.; Blair, D. L.; Weiss, R. G. Langmuir 2009, 25, 8615-8625.
(b) Mallia, V. A.; Terech, P.; Weiss, R. G., J. Phys. Chem. B 2011, 115, 12401–12414.

5 (a) Carretti, E.; Bonini, M.; Dei, L.; Berrie, B. H.; Angelova, L. V.; Baglioni, P.; Weiss, R. G. Acc. Chem. Res. 2010, 43, 751–760.
(b) Angelova, L. V.; Terech, P.; Natali, I.; Dei, L.; Carretti, E.; Weiss, R. G. Langmuir 2011, 27, 11671–11682.

6 Toro-Vazquez, J. F.; Morales-Rueda, J.; Mallia, V. A.; Weiss, R. G. Food Biophys. 2010, 5, 193-202.

About the Speaker:
Richard G. Weiss received his ScB degree from Brown University and his PhD degree from the University of Connecticut (Mentor: Eugene I. Snyder), and spent 2 years as a postdoctoral fellow at California Institute of Technology (Mentor: George S. Hammond) under the auspices of a National Institutes of Health Postdoctoral Fellowship. He spent 3 years at the Instituto de Quimica of the Universidade de São Paulo in Brazil as Visiting Assistant Professor and Overseas Fellow of the National Academy of Sciences before joining Georgetown University where he is now Professor of Chemistry. He is a Senior Editor for the ACS journal, Langmuir. He has received 2 Fulbright Research Fellowships, is an ‘Honor Professor’ of the Institute of Photographic Chemistry (Chinese Academy of Sciences), a Foreign Member of the Brazilian Academy of Sciences, a Fellow of the International Union of Pure and Applied Chemistry, and a Doctor honoris causa of the Universite Bordeaux 1 (France). He has been a consultant for the World Bank on science/education loan projects in Brazil, India, The Philippines and a visiting professor in Brazil, Germany, France, Costa Rica, China, Italy, Slovakia, India, and Japan. The research program of the Weiss group is multidisciplinary. He has published more than 280 articles and chapters on subjects dealing with mechanistic photochemistry and photophysics, mechanisms of reactions, nuclear magnetic resonance in aligning media, gels, ionic liquids, polymers, and liquid crystals.

This Event is For: Graduate • Faculty • Post-Docs

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