Topic: The performance of the self-assembled doped nanocomposites based on mesoporous thin films with an emphasis on host-guest interaction
Speaker: Prof. German Telbiz, L.V. Pisarzhevsky Institute of Physcical Chemistry Academy of Science of Ukraine
Date & Time: Tuesday, Nov. 4, 2008, 1:00 PM
Place: Room 140 VMC (Chambers Hall)
The synthesis of nanostructured materials and nanocomposites is a recent branch of the nanotechnology. There has been an increasing interest in the development of ordered mesoporous materials for wide variety of applications which include sensors, photo catalysis electronic and optical devices such as transistors, light emitting devices and lasers. A synthesis procedure of mesoporous materials involves the formation of organic–inorganic composites by self-assembly, where organic surfactant forms a micelle surrounded by inorganic on a mesoscopic scale and serves as a template for mesopores. Depending on the composition, nature of templates, and synthesis conditions, we can obtain 2D-hexagonal, 3D-hexagonal or cubic mesostructures. More perspective for application are mesoporous thin film which can be formed by the various method from the homogeneous solution of precursors and surfactant dissolved in alcohol below critical micelle concentration, the preferential evaporation of the solvent during dip or spin coating drives cooperative self-assembly of the silica and surfactant.
The focus of this seminar is limited to a review on the preparation and characterization of thin silica and titanium ordered mesoporous sol-gel film having a well-defined, discrete, pore shape and size of 2–300nm, the performance of the doped nanocomposites, with an emphasis on the role of the “host-guest” and “guest-guest” interaction between organic (dye, polymer, surphactant) and inorganic (Ag, Au, ZnO nanoarhitecture) as guest and host - channel structure of mesoporous oxide. The possible mechanism to get stable nanocomposite materials with controlled characteristics (porosity, roughness, thickness, morphology) for photocatalysis, optical and sensor application will be discussed.
Dr. German Telbiz is head of research group, associated professor at the L.V.Pisarzhevsky Institute of Physical Chemistry Academy of Science of Ukraine. He obtained his PhD (1986) from Institute of Physical-Organic Chemistry and Carbon Chemistry on acid properties doped multicomponent zeolite catalysis and this was awarded with honor in Institute of Petroleum Chemistry, Ufa, Russia (1988) and P.Lumumba University, Moscow (1990). Later he carried out his postdoctoral research at the L.V.Pisarzhevsky Institute of Physical Chemistry and Institute of Physical Chemistry, Berlin (1989-1990). In 1998 he was CRDF visitor in University of California at Santa Barbara (laboratory of professor G. Stucky), Maria Curie-Sklodowska University, Lublin, Poland (2005) Institute of physics, Vilnius(2006, 2007). Dr Telbiz has authored and co-authored 120 journal article and 6 patents. His current interest include synthesis and properties studies of the microporous and mesoporous materials with application ones as hosts of organic dye, organic polymers, and nonorganic (metal oxide, metal clusters) guest. His main scientific interests are in the template synthesis and characterization of the ordered thin mesoporous sol-gel films doped by as dye as gold and silver nanoarchitecture in confined micro- and nanoenvironment, the developments of photoactive nanoscopic materials and sensors.
Refreshments will be served at 12:45 PM