YBa 2 Cu 3 O 7−δ superconducting nanofibres were successfully fabricated via the electrospinning method in combination with the sol-gel process. The solution was prepared by the sol-gel process with a homogeneous aqueous PVA solution containing Y, Ba, and Cu acetates. The viscosity of the precursor sol for electrospinning was controlled by the evaporation of solvent and a condensation reaction. The electrospun nanofibres were pyrolysed to remove PVA or volatile components, and then sintered to generate a superconducting phase. The critical transition temperature (T c ) of superconducting YBa 2 Cu 3 O 7−δ nanofibres was measured by DC susceptibility tests. By optimizing the electrospinning process and following heat treatments, superconducting YBa 2 Cu 3 O 7−δ nanofibres with a T c = 92.2 K could be produced.
A planar micro triggered spark gap switch with three electrodes was designed and fabricated based on non-silicon surface micromachining technology. It consists of two main electrodes, the shape of which is semicircle, and a triggering electrode which is a thin strip. The gap distance between two main electrodes is 800μm. Benefitting from MEMS technology, the switch is integratable and its cost has the potential to be reduced. The designed switch has been optimized and tested. It gives out a pulse current with peak of 5165.21A and 129.6ns rise time. The test data has an agreement with the simulation results.
We propose a novel preparation technology of CNTs modified electrode. CNTs are mixed with polymer into homogenate by mechanical ball grinder; spin homogenate into composite film; solidify and polish composite film; chemical etch polymer partly from the surface of the composite film, in order to keep part of the CNTs be inserted in polyimide and the remainder outside of film, then CNTs modified electrode can be got. The morphologies of CNTs modified electrode are observed by field emission scanning electron microscopy (FESEM). The application of CNTs modified electrode in alum solution battery is demonstrated. Cyclic voltammetry of CNTs modified electrodes in V4+ solution is discussed.
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