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One-Step One Chemical Synthesis Process of Graphene from Rice Husk for Energy Storage Applications 被引量:1
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作者 pushpendra singh Jitendra Bahadur Kaushik Pal 《Graphene》 2017年第3期61-71,共11页
Few layer graphene was synthesized using rice husk ash (RHA) and potassium hydroxide (KOH). This methodology demonstrates the utility of RHA as carbon source for graphene synthesis and as a protective barrier against ... Few layer graphene was synthesized using rice husk ash (RHA) and potassium hydroxide (KOH). This methodology demonstrates the utility of RHA as carbon source for graphene synthesis and as a protective barrier against oxidation of parent rice husk and KOH mixture. Oxidation may occur during synthesis process due to high temperature annealing of RHA and KOH mixture. Electrochemical characterization showed decent capacitance value 86 F&#183g-1 at 500 mV&#183s-1. XRD and Raman spectroscopy analysis confirmed the presence of graphitic structure. Transmission electron microscopy visually confirmed presence of few layer graphene. Novelty of this synthesis technique can be described as one-pot, one chemical synthesis technique. Use of natural precursor makes this technique highly cost effective for large scale production. 展开更多
关键词 RICE Husk GRAPHENE Silicon Dioxide CYCLIC VOLTAMMETRY
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Particles dispersion on fluid-liquid interfaces
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作者 Sathish Gurupatham Bhavin Dalal +3 位作者 Md.Shahadat Hossain Ian S.Fischer pushpendra singh Daniel D.Joseph 《Particuology》 SCIE EI CAS CSCD 2011年第1期1-13,共13页
This paper is concerned with the dispersion of particles on the fluid-liquid interface. In a previous study we have shown that when small particles, e.g., flour, pollen, glass beads, etc., contact an air-liquid interf... This paper is concerned with the dispersion of particles on the fluid-liquid interface. In a previous study we have shown that when small particles, e.g., flour, pollen, glass beads, etc., contact an air-liquid interface, they disperse rapidly as if they were in an explosion. The rapid dispersion is due to the fact that the capillary force pulls particles into the interface causing them to accelerate to a large velocity. In this paper we show that motion of particles normal to the interface is inertia dominated; they oscillate vertically about their equilibrium position before coming to rest under viscous drag. This vertical motion of a particle causes a radially-outward lateral (secondary) flow on the interface that causes nearby particles to move away. The dispersion on a liquid-liquid interface, which is the primary focus of this study, was relatively weaker than on an air-liquid interface, and occurred over a longer period of time. When falling through an upper liquid the particles have a slower velocity than when falling through air because the liquid has a greater viscosity. Another difference for the liquid-liquid interface is that the separation of particles begins in the upper liquid before the particles reach the interface. The rate of dispersion depended on the size of the particles, the densities of the particle and liquids, the viscosities of the liquids involved, and the contact angle. For small particles, partial pinning and hysteresis of the three-phase contact line on the surface of the particle during adsorption on liquid-liquid interfaces was also important. The frequency of oscillation of particles about their floating equilibrium increased with decreasing particle size on both air-water and liquid-liquid interfaces, and the time to reach equilibrium decreased with decreasing particle size. These results are in agreement with our analysis. 展开更多
关键词 Adsorption Interfacial tension Particle dispersion Fluid–liquid interface Capillary force Viscous drag
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