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首页> 外文期刊>Journal of Nanoparticle Research >Measurement of filtration efficiency of Nuclepore filters challenged with polystyrene latex nanoparticles: experiments and modeling
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Measurement of filtration efficiency of Nuclepore filters challenged with polystyrene latex nanoparticles: experiments and modeling

机译：聚苯乙烯胶乳纳米颗粒挑战的Nuclepore过滤器的过滤效率的测量：实验和建模

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摘要

Membrane filtration has been demonstrated to be effective for the removal of liquid-borne nanoparticles (NPs). Such technique can be applied to purify and disinfect drinking water as well as remove NPs in highly pure chemicals used in the industries. This study aims to study the filtration process of a model membrane filter, the Nuclepore filter. Experiments were carried out using standard filtration tools and the nanoparticle tracking analysis (NTA) technique was used to measure particle (50–500 nm) concentration upstream and downstream of the filter to determine the filtration efficiency. The NTA technique has been calibrated using 150-nm polystyrene latex particles to determine its accuracy of particle concentration measurement. Measurements were found reliable within a certain concentration limit (about 108–1010 particles/cm3), which is dependent on the camera settings during the measurement. Experimental results are comparable with previously published data obtained using the aerosolization method, validating the capability of the NTA technique. The capillary tube model modified from that developed for aerosol filtration was found to be useful to represent the experimental results, when a sticking coefficient of 0.15 is incorporated. This suggests that only 15% of the particle collisions with the filter results in successful attachment. The small sticking coefficient found can be explained by the unfavorable surface interactions between the particles and the filter medium.
机译：膜过滤已被证明可有效去除液态纳米颗粒（NPs）。这种技术可用于净化和消毒饮用水以及去除工业中使用的高纯化学品中的NP。本研究旨在研究模型膜过滤器（Nuclepore过滤器）的过滤过程。实验是使用标准的过滤工具进行的，纳米颗粒跟踪分析（NTA）技术用于测量过滤器上游和下游的颗粒（50-500 nm）浓度，以确定过滤效率。已使用150 nm聚苯乙烯乳胶颗粒对NTA技术进行校准，以确定其颗粒浓度测量的准确性。发现测量在一定的浓度极限（大约10 8 –10 10 颗粒/ cm 3 ）内是可靠的，这取决于相机设置在测量过程中。实验结果与之前使用雾化方法获得的数据相当，从而验证了NTA技术的能力。发现当结合系数为0.15时，从为气溶胶过滤开发的毛细管模型修改而来的毛细管模型可用于代表实验结果。这表明只有15％的粒子与过滤器碰撞会导致成功附着。所发现的较小的粘附系数可以通过颗粒与过滤介质之间不利的表面相互作用来解释。

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