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Lecture Dimitrios Gournis


12 July 2007 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Dimitrios Gournis
Affiliation:Department of Materials Science and Engineering, University of Ioannina, Greece
Title:Clay-based hybrid materials: Filling interlayers
Date:Thu Jul 12, 2007
Location:FWN-Building 5114.0004
Host:Petra Rudolf
Telephone:+31 50 363 4736


Tuning the molecular alignment in two-dimensions modifies physical and chemical properties. Smectite clays, a class of layered aluminosilicate minerals, have a unique combination of swelling, intercalation and ion exchange properties that make them valuable nanostructures in diverse fields. The nature of the microenvironment between the aluminosilicate sheets regulates the topology of the intercalated molecules and affects possible supramolecular rearrangements or reactions, such as self-assembling processes that are usually not easily controlled in the solution phase. Initially, the insertion and the subsequent behavior of various molecules, characterized by the presence of positive charges, into the interlayer space of layered-smectite clays will be presented. Fullerene derivatives, polyaromatic molecules, enzymes, etc are few characteristic examples. Experimental results, obtained with various characterization techniques, document the insertion in the aluminosilicate matrix and reveal the behaviour of the intercalants into the lamellar space of smectite. In addition, the role of clay nanoplatelets as a controlling template for the synthesie of organic macrocycles, as well as, for the preparation of novel clay/carbon nanotube hybrids is also presented. The latter hybrid materials are particularly attractive for polymer reinforcing applications since the combined action of clay-carbon nanotubes in polymer matrixes provides outstanding functionalities to the resulting composite materials.
Last modified:22 October 2012 2.31 p.m.