TechConnect Proceedings Papers
Month: June 2012
Preparation Routes to Aqueous Graphene Dispersions and Their Influence on Electrical Conductivity of Polymer Composites
In this work, starting from graphite, we produced graphene dispersed in water following the two main chemical conversion approaches and a physical conversion via ultrasonic exfoliation. Subsequently, graphene /polystyrene (PS) composites were prepared using the [...]
Moisture Assisted Electron Transport in Si-C Nanotubes: an ab-initio study
We investigate the effect of moisture-chemisorption on the electron transport properties in a (8, 0) semiconducting silicon-carbide nanotube (SiCNT) by applying self consistent non-equilibrium Green’s function formalism in combination with the density-functional theory. The results [...]
Stacked Self-standing Carbon Nanotube Forest Films utilizing Periodical Multi-layered (Fe/AlN)n Films
A novel Carbon Nanotube structure, stacked self-standing carbon nanotube forest films achieved by a newly developed periodically deposited multi-layered (Fe/AlN)n film, are presented. Fe and AlN films were deposited on the substrate periodically by magnetron [...]
Morphology control of carbon nanotubes in continuously spun fibres
Multifunctional attributes of carbon nanotubes (CNTs) have attracted the focus of industrial and academic communities alike. Translating the properties of individual CNTs into their macroscopic ensembles – fibres, yarns or films - is envisaged to [...]
The study of the microwave absorption and optical properties of the Al- N codoped SiC Nanopowders
Nanopowders of aluminum and nitrogen codoped β-silicon carbide (β-SiC) were successfully produced by self-propagating high-temperature synthesis in a nitrogen atmosphere. Characterizations by X-ray diffraction and scanning electron microscopy demonstrate the formation of Al-N codoped β-SiC [...]
Electrical conductivity of carbon nanopowder fillers and their respective polymer composites prepared via latex technology
Ghislandi M., Marinho B., Tkalya E., Koning C.E., de With G., Eindhoven University of Technology, NL
The electrical conductivity of graphene, multi-wall carbon nanotubes (MWCNTs) and carbon black (CB) nanopowders, and graphite powder is characterized in the form of paper-like films (buckypapers) and by means of powder compression. Subsequently, carbon filler [...]
Unusual thermal diffusion of carbon nanotubes in a thermoplastic polymer
The dispersion of carbon nanotubes in polymer composites is a major challenge. Although nanotubes have a high aspect ratio, their tendency to agglomerate limit percolation at low loading. We find that thermal diffusion is reducing [...]
Near-Infrared Light Induced Mechanical Responses in Single-to-Few Layer Graphene
Layer dependent physical responses of graphene-based polymer composites to near-infrared (NIR) light are reported. Thin film polymer composites were fabricated and compared utilizing both single layer graphene and few layer graphene (~5 layers). NIR-induced axial [...]
Photomechanical Response in Graphene Nanoplatelet Composites
Loomis J., King B., Burkhead T., Xu P., Bessler N., Terentjev E., Panchapakesan B., University of Louisville, US
Large light-induced reversible and elastic responses of graphene nanoplatelet (GNP) polymer composites are reported. Homogeneous mixtures of GNP/polydimethylsiloxane (PDMS) composites (0.1–5 wt%) were prepared and their near-infrared (NIR) mechanical responses studied with increasing pre-strains. Using [...]