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外文会议>International conference on carbon;CARBON 08
>CONTROLLED AND IRREVERSIBLE DECORATION OF SURFACTANT-LESS, SLIGHTLY DISORDERED, WELL-DISPERSED MULTI-WALLED CARBON NANOTUBES WITH ALUMINA MATRIX PARTICLES BY A UNIQUE AQUEOUS COLLOIDAL APPROACH
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CONTROLLED AND IRREVERSIBLE DECORATION OF SURFACTANT-LESS, SLIGHTLY DISORDERED, WELL-DISPERSED MULTI-WALLED CARBON NANOTUBES WITH ALUMINA MATRIX PARTICLES BY A UNIQUE AQUEOUS COLLOIDAL APPROACH
Hetroaggregation is employed in a controlled way to mass-producing individually alumina-decorated multi-walled carbon nanotubes (CNTs) with optimized and controlled compositions with the aim of obtaining reinforced homogeneously dispersed CNT-alumina matrix nanocomposite after spark plasma sintering. Surfactant-less, hydrophilic, slightly disordered, crystalline multi-walled carbon nanotubes (CNTs) were successfully prepared, and then individually decorated with the alumina matrix particles by a well-controlled aqueous colloidal approach. The homogeneous composites can only be obtained for CNT concentrations in the range 2.4 - 16 vol.%. Irreversibility of decoration is examined, and homogeneity of the composite is further investigated based on supernatant transparency proposed in our approach. The tight bonding at the CNT-alumina interface and the homogeneous distribution of individual CNTs within the matrix are thought to be due to the strong electro-static attraction potential prevailing between the negatively charged CNTs and positively charged alumina particles once they were mixed together at an appropriate acidic pH. The considerable reinforcement observed after spark plasma sintering and supported by microstructural characterization can experimentally show the effectiveness of these surfactant-less, slightly disordered, individually decorated CNTs as predicted.
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