graphene – Page 9 – TechConnect Briefs

Manufacturing Tough Amorphous Thermoplastic-Graphene Nanocomposites

Bandla S., Hanan J.C., Oklahoma State University, US

Nanocomposites have been studied for more than two decades because of their superior performance in comparison with traditional composites. However, few products made using nanocomposites are available commercially. Achieving uniform dispersion in the polymer matrix, [...]

Preparation Routes to Aqueous Graphene Dispersions and Their Influence on Electrical Conductivity of Polymer Composites

Ghislandi M., Tkalya E., Alekseev A., Koning C.E., de With G., TU/e, NL

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 [...]

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 [...]

Near-Infrared Light Induced Mechanical Responses in Single-to-Few Layer Graphene

Loomis J., King B., Panchapakesan B., University of Louisville, US

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 [...]

Mapping nanomechanical phenomena of graphene nanostructures using force modulation and ultrasonic force microscopy

Kolosov O.V., Kay N.D., Robinson B.J., Rosamond M., Zeze D., Dinelli F., Lancaster University, UK

Whereas graphene electronic properties are extensively studied, mechanical properties of graphene nanostructures are much less experimentally explored even for simple graphene structures. We use a combination of force sensitive scanning probe microscopies that combines low [...]

Direct nanoscale imaging of ballistic and diffusive thermal transport in graphene nanostructures

Kolosov O.V., Pumarol M.E., Tovee P., Rosamond M.C., Petty M.C., Zeze D.A., Falko V., Lancaster University, UK

We report direct imaging of thermal transport in single and few-layer graphene with approximately 50 nm lateral resolution using high vacuum scanning thermal microscopy. Images reveal low thermal resistance of areas of suspended graphene where [...]

Detailed studies of graphene grown on C-face SiC

Virojanadara C., Linkoeping University, SE

The registry of adjacent graphene layers grown on the C-terminated SiC surface has been reported to be dramatically different compared to graphene grown on the Si-terminated SiC(0001) surface. Whereas Si-face graphene exhibits sharp spots in [...]

Synthesis of the string-like CNT having few layers stacking of graphene

Muramatsu K., Toyoda M., Incubation　Alliance,Inc., JP

In this study and development,it challenged in synthesizing of flexible CNT having few layers graphene and showing the excellent physical property different from graphite fibers. In this study,raw material calcined and cobalt acetylacetonato were mixed [...]

High Electrical Conductivity Nanocomposites Prepared with Graphenes Synthesized by Catalyst Stagger

Nguyen C.K., Le Van G., Mai N.T.A., Hieu D., SAIGON HI TECH PARK, VN

We have discovered a new way of making graphene using specific catalyst stagger. The catalyst staging mechanism is believed to prevent the full adsorption of C free radicals, which forms tubular shape products. The specific [...]