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首页> 外文期刊>Journal of Membrane Science >Characterization of meso- and macroporous ceramic membranes in terms of flux measurement: A moment-based analysis
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Characterization of meso- and macroporous ceramic membranes in terms of flux measurement: A moment-based analysis

机译：用通量测量表征中孔和大孔陶瓷膜：基于矩的分析

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This work addresses the determination of unimodal log-normal pore size distributions (PSDs) in porous symmetric membranes through a convenient selection of a set of statistical moment generating functions. Relevant information concerning such distributions can be obtained by performing three independent permeation experiments: (1) pure Knudsen single-gas diffusion permeance, (2) pure liquid permeability, and (3) non-hindered diffusion permeance of a target solute. In the special case of porous asymmetric UF, NF and MF ceramic membranes, the contribution of the support to the overall mass transfer tends to increase for permeation processes governed by lower moments of the PSD. For such membranes, a mean diameter of the top layer and the thickness-to-porosity ratio of the support can be accurately determined, which constitute two structural parameters relevant for a preliminary membrane selection. The application of moment theory following the guidelines of Mason allows the determination of upper and lower bounds on the cumulative PSD of active layers from measured moments.
机译：这项工作通过方便地选择一组统计矩生成函数来解决多孔对称膜中单峰对数正态孔径分布（PSD）的确定问题。可以通过执行三个独立的渗透实验来获得有关此类分布的相关信息：（1）纯克努森单气体扩散渗透率，（2）纯液体渗透率和（3）目标溶质的无阻碍扩散渗透率。在多孔非对称UF，NF和MF陶瓷膜的特殊情况下，对于受PSD较小力矩控制的渗透过程，载体对整体传质的贡献趋于增加。对于这种膜，可以精确地确定顶层的平均直径和载体的厚度与孔隙率之比，这构成了与初步膜选择有关的两个结构参数。遵循梅森准则的矩理论的应用允许根据测量的矩确定活动层的累积PSD的上限和下限。

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