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CAER Seminars

Helix Spiral Cone Structure of Stacked Cup Carbon Nanofibers and Their Application on Conductive Nanocomposites

Jose Vera-Agullo
Chemical Engineering Department
University of Alicante, Spain

Wednesday, November 7, 2007 3:00 pm
Ben Bandy Conference Room
UK Center for Applied Energy Research


One of the most important applications for carbon nanofilaments is their use as conductive additives in polymers. The final use of the composites depends on their electrical resistivity, ranging from dissipation of electrostatic charges or electrostatic painting to EMI shielding. The goal is to use the lowest quantity of nanofilaments to obtain a low electrical resistivity without diminishing the mechanical properties.

We have recently observed that the stacked cup carbon nanofibers are formed by a continuous scroll of graphene layers that are rolled in a helix-spiral form along the filament axis, leaving a wide hollow space. As a consequence, they are not formed by discontinuous truncated cones, and present high-conductivity levels. Due to this structure, the filament breaks along the axis more easily than MWNTs when a high shear is applied, which greatly favors the dispersion in the viscous thermoset resins. In this work we determine the percolation threshold of polyester composites with three types of carbon nanofilaments and its relation to both the aspect ratio and the dispersion of the filaments. The composites were processed by a rotor-stator mixer working between 2000 and 7000 rpm. . . . and

Graduate Students Exchange Program at the University of Alicante: Research and Daily Life

The University of Kentucky Center for Applied Energy Research has recently signed an agreement with the University of Alicante (Spain) for the exchange of Graduate Students for 3-6 months stay. This talk will present information on the location of Alicante in Spain, the description of the university campus and the most interesting research lines for CAER graduate students (MWNT functionalization and nanocomposites, catalysis, adsorbent carbon, carbon fibers, C/C composites, combustion and pollutant formation, etc.) and a description of how daily life and the cost of living are, according to the incomes. For example, you do not need a car to move around the city since the public transportation is good.