[Mirror URL] http://poohbah.cem.msu.edu/chem_main/gradoff/brochure/brochf/Pinnavaia.htm
Inorganic Materials Chemistry: Porous Structures and Nanocomposites
Thomas J. Pinnavaia
University Distinguished Professor
Thomas J. Pinnavaia
University Distinguished Professor (b. 1938). B.A., 1962, SUNY at Buffalo; Ph.D., 1967, Cornell University. Inorganic and Materials Chemistry; intercalation chemistry of complex layered oxides;
solid acids and bases;
applications to environmental problems;
molecular design of composite materials with nano-structured architectures.
Intercalated Lamellar Solids. A major objective of his research program is to tailor the intercalation chemistry and surface chemistry of certain classes of layered compounds as a means of rationally designing porous materials with novel properties for heterogeneous catalysis and adsorption. By inserting robust ions or metal oxide aggregates in the interlayer region of a lamellar host, they can effectively pillar the structure so that the intracrystal surfaces become available for adsorption and catalysis. Three types of pillared lamellar structures are under investigation, namely, layered silicate clays, layered double hydroxides, and layered silicic acids.
Mesoporous Molecular Sieves. They are developing new surfactant assembly routes to mesoporous molecular sieves. One strategy being pursued makes use of the formation of surfactant micelles in the gallery region of a layered host. As shown by the diagram at right, it is possible to assemble framework silica around the intercalated surfactant micelles when confined in the galleries.
Another approach makes use of neutral bolaamphile surfactants to assemble lamellar metal oxide mesostructures with a vesicle-like morphology. They also are designing bulk mesostructures based on the supramolecular assembly of neutral surfactants and neutral inorganic precursors. This strategy is providing a wealth of mesoporous oxides with structures that range from multilamellar vesicles to channel structures with wormhole and sponge-like motifs.
Polymer Nanocomposites. Another general area of interest is the synthesis and properties of polymer nanocomposites. These are materials in which silicate nanolayers are dispersed in an organic polymer matrix in order to dramatically improve the performance properties of the polymer. The key to forming such novel materials is understanding and manipulating the guest-host intercalation chemistry occurring between the polymer and the layered compounds. Thus, they are very interested in interactions between organic molecules and inorganic surfaces.
Assembly of Hydrothermally Stable aluminosilicate Foams and Large Pore Hexagonal Mesostructures from Zeolite Seeds, Y. Liu and T. J. Pinnavaia, Chem. Mater., 14, 3 (2002).
Mesostructured Forms of g-Alumina, Z. Zhang, R. W. Hicks, T. R. Pauly and T. J. Pinnavaia, J. Amer. Chem. Soc., 124, 1592 (2002).
Heterostructured Fluorohectorite Clay as an Electrochemical Sensor for the Detection of 2,4-Dichlorophenol and the Herbicide 2,4-D, D. Ozkan, K. Kerman, B. Meric, P. Kara, H. Demirkan, M. Polverejan, T. J. Pinnavaia, M. Ozsoz, Chem. Mater., 14, 1755 (2002).
Role of Sodium Versus Local Framework Structure in Determining the Hydrothermal Stability of MCM-41 Mesostructures, T. R. Pauly, V. Petkov, Y. Liu, S. J. L. Billinge, T. J. Pinnavaia, J. Am. Chem. Soc., 124, 97 (2001).
Steam-Stable MSU-S Aluminosilicate Mesostructures Assembled from Zeolite ZSM-5 and Zeolite Beta Seeds, Y. Liu, W. Zhang, and T. J. Pinnavaia, Angew. Chem Int. Ed., 113, 1295 (2001).
Department of Chemistry, Michigan State University
Chemistry of Advanced Materials: An Overview
Nanoporous Materials II
Summary by Hongwei Yang on 07-16-2003
Last updated by Hongwei Yang on 07-16-2003