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Enhancing the separation of nano-sized particles in low-salt suspensions by electrically assisted cross-flow nitration

机译:通过电辅助错流硝化作用增强低盐悬浮液中纳米级颗粒的分离

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A cross-flow filtration module with a large pore-size membrane and low operation pressure was built,as a first attempt,to test its performance on the separation of synthetic nano-sized alumina and silica particles in the presence of an electric field.For practicality sake,turbidity measurements were used primarily to evaluate the particle removal efficiency and to determine critical currents.The observed critical currents agreed well with theoretically calculated.The critical currents observed were found to be strongly dependent on the conductivity;there was a linear relationship between the critical current and conductivity.Further theoretical analysis of the electrical filtration module reveals that particles of different size or surface charge(e.g.,zeta potential)can be separated within a particular size range by controlling the ionic strength or the conductivity of the solution.
机译:首次尝试构建具有大孔径膜和低操作压力的错流过滤模块,以测试其在电场存在下对合成纳米氧化铝和二氧化硅颗粒的分离性能。实用性起见,浊度测量主要用于评估颗粒去除效率和确定临界电流。观察到的临界电流与理论计算值吻合良好。观察到的临界电流强烈依赖于电导率;两者之间存在线性关系对电过滤模块的进一步理论分析表明,通过控制溶液的离子强度或电导率,可以在特定的尺寸范围内分离出不同大小或表面电荷(例如,ζ电位)的颗粒。

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