The radiation-induced displacement damage in yttrium borate (YBO 3) is studied under X-ray, proton, and alpha irradiation. The photoluminescence (PL) was tested before and after irradiation to determine whether damage...
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Stable dispersions of nanoscale Kevlar fibers with diameters between 3 and 30 nm were obtained by deprotonating macroscale, commercial Kevlar yarns with potassium hydroxide in dimethyl sulfoxide. Those aramid nanofibe...
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ISBN:
(纸本)9788888785332
Stable dispersions of nanoscale Kevlar fibers with diameters between 3 and 30 nm were obtained by deprotonating macroscale, commercial Kevlar yarns with potassium hydroxide in dimethyl sulfoxide. Those aramid nanofibers were surface-treated with phosphoric acid (PA) and glutaraldehyde (GA), and assembled via layer-by-layer (LBL) and vacuum-assisted filtration method into transversely isotropic films. Through Fourier-transform infrared spectroscopy, transmission-electron microscopy, uniaxial tensile testing and thermo-gravimetric analysis, it was shown that PA hydrolyzes aramid nanofibers which created useful functional groups for surface bonding and GA polymerizes those PA-hydrolyzed nanofibers which served as an inter-fiber crosslinker to improve network properties. A hierarchically structured film made of alternating layers of the high-stiffness, PA/GA-treated, aramid-nanofiber network and high-ductility polyurethane/poly (acrylic acid) was demonstrated to have stiffness and strength exceeding those of commercial Kevlar fiber-woven mats.
Due to their superior theoretical performances, the silicon-based materials have been intensively researched to replace the commercial graphite anode (372 mAh g-1). However, the pulverization and following performance...
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ISBN:
(纸本)9788888785332
Due to their superior theoretical performances, the silicon-based materials have been intensively researched to replace the commercial graphite anode (372 mAh g-1). However, the pulverization and following performance deterioration of silicon has emerged as a serious problem to develop the high performance anode. To overcome this demerit, considerable attempt has been made to develop composite anodes using the carbonaceous and silicon-based materials. In this work, silicon core/ carbon shell (Si core/C shell) nanofibers are manufactured using co-axial electrospinning of Si nanoparticles dispersed in styrene-co-acrylonitrile core solution and poly(acrylonitrile) shell solution and are subsequently carbonized. Then, the effect of the core-shell structure on the electrochemical performance is evaluated using galvanostatic charge-discharge test. By comparing the electrochemical performance of Si core/C shell nanofibers with that of Si/C solid composite nanofibers, it is demonstrated that the core-shell structure is an efficient structure to improve the electrochemical performance of Si/C composite anodes.
In an attempt to develop conductive, biodegradable, mechanically strong, and biocompatible nerve conduits, pure magnesium (Mg) was used as the biodegradable substrate material to provide strength while the conductive ...
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