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Application of graphene derived nanomaterial in microwave absorption has been limited by the issue of excessively high dielectric loss. To address this issue, instead of resorting to burdensome compositing with metal and ceramic particles, we put forward the idea of approaching impedance match by transforming graphene from diamagnetic to ferromagnetic and meanwhile suppress the conductivity. In this...
The mass production of non-precious metal catalysts (NPMCs) with high catalytic performance for oxygen reduction reaction (ORR) is highly desirable for promoting the commercialization of proton membrane fuel cells. In this work, one-pot synthesized covalent porphyrin polymers (CPP) incorporated with iron chlorides (Fe-CPP) were converted into N-doped porous Fe3C@carbons (Fe3C@C) at a scale of over...
The increasing demand for multifunctional polymer nanocomposites calls for new technologies to simultaneously enhance mechanical, electrical, and thermal properties. This paper presents the use of an alternating-current electric field to align graphene nanoplatelets (GnPs) in an epoxy polymer. Theoretical modeling of the alignment process has identified the key parameters that control the rotation...
An effective chemical strategy for the synthesis of polymer–ionic liquid (IL) electrolytes with ion-conducting channels, physically modulated by variously dimensioned IL-functionalized carbon materials (IL-FCMs) including carbon black (CB), multi-walled carbon nanotubes (MWCNT) and reduced graphene oxide sheets (RGO) is reported, enabling a fundamental understanding of the relationship between carbon...
The nanostructure of amorphous carbon thin film is described in terms of a disordered conductive sp 2 phase embedded in an electrically insulating sp 3 matrix. The conductive sp 2 phase is dominated by Drude type free-carries response, and the carrier conductive between sp 2 clusters is hopping. The two conductivities are in a serial configuration under a percolation...
Carbon nanotubes (CNTs) were grown on diamond-coated Si substrates and free-standing diamond wafers to develop efficient thermal interface materials for thermal management applications. High-quality, translucent, free-standing diamond substrates were processed in a 5kW microwave plasma chemical vapor deposition (CVD) system using CH 4 as precursor. Ni and Ni–9%W–1.5%Fe catalyst islands were...
The influence of carboxylic multi-walled carbon nanotubes (c-MWCNTs) on the immune activities of dendritic cells (DCs), the most important professional antigen presenting cells, is evaluated. In spite of their diameters, c-MWCNTs are generously phagocytosed by DCs without any cytotoxicity. Treatment with c-MWCNTs, with concentrations of up to 100μg/mL, does not induce phenotypical maturation of DCs...
Carbon nanotube (CNT) mediated delivery system of drugs etc. has currently aroused a large interest. Because the delivery system will be ultimately introduced into the human body, the information about the in vivo biological behavior and consequences of CNTs becomes very important. Here, using [ 14 C-taurine]-multi-walled CNTs (MWCNTs) as tracers, we show the biodistribution and translocation...
When fluffy carbon nanotubes (CNTs) are subjected to a photoflash, there is a rapid increase in temperature to over 475°C within 0.03s. This is attributed to absorption of the light by the CNTs, which results in the generation of an acoustic wave and oxidation of the CNTs. Ignition is due to the exposure of the flammable catalytic particles embedded in CNTs to air. The appearance of sub-micrometer...
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