Rice University

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Seminar

Richard E. Smalley Institute for Nanoscale Science and Technology

Speaker: Oren Regev
Associate Professor- Department of Chemical Engineering
Ben-Gurion University of the Negev, Israel

Dispersion of Nanotubes and platelets: the applications

Monday, April 21, 2014
4:00 PM  to 5:00 PM

106  Space Science Building
Rice University
6100 Main St
Houston, Texas, USA

The utilization of cement or highly branched polymer (e.g., epoxy resins) are often limited by their brittle nature (low fracture toughness). Loading these matrices by fillers such as individual nanotubes of graphene is a promising alternative to enhance thermal conductivity and fracture toughness without compromising other mechanical properties. In my presentation I will show microscopy characterization of composite systems. A record fracture toughness enhancement in polymer and cement matrices has been achieved using a novel dispersion method. The individual nanotube concentration in the composite is accurately determined. We also demonstrate a coherent quantitative correlation between the fracture toughness and the surface roughness. Finally, comprehensive statistical investigation of the nanotube failure mechanisms shows that carbon nanotubes fail via fracture mechanism, while tungsten di-sulfide nanotubes via pullout mechanism.

Biography of Oren Regev: http://www.bgu.ac.il/RS_Minerva/CV_Oren_regev.htm



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