Study of fluid and transport properties of porous anodic aluminum membranes by dynamic atomic force microscopy.
Study of fluid and transport properties of porous anodic aluminum membranes by dynamic atomic force microscopy.
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动态原子力显微镜研究多孔阳极铝膜的流体和传输特性。
DOI：
10.1021/la401261z
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Wu C
中科院分区：
文献类型：
--
作者：
Wu C
由于预测和观察到碳纳米管可以提高水处理的流速，因此碳纳米管在水处理中的潜在应用成为近年来研究的重点。最近对不太为人所知的多孔阳极氧化铝膜（PAAMs）的研究也显示出流动增强，尽管只是在碳纳米管中观察到的一小部分。尽管具有潜在的应用前景，但对PAAMs的水动力特性的研究很少，在本文中，我们提出了实验结果和理论模型，探讨了这些膜周围和通过这些膜的流体流动行为。实验采用原子力显微镜（AFM）将固体二氧化硅颗粒推向具有不同孔径的PAAMs。此外，PAAMs被分类为封闭或开放，后者允许流体通过。用于描述实验数据的理论模型包含了Derjaguin-Landau-Verwey-Overbeek （DLVO）效应、悬臂阻力和水动力。通过使用滑移边界条件计算水动力，我们能够将模型与实验结果拟合，并且还证明了封闭和开放PAAMs之间的差异可以忽略不计。滑移长度不符合PAAMs的任何物理特征，但我们的模型确实提供了一种简单而有效的方法来描述PAAMs和一般膜的流体动力学。
Recent work on carbon nanotubes (CNT) has focused on their potential application in water treatment as a result of their predicted and observed enhanced flow rates. Recent work on the lesser-known porous anodic alumina membranes (PAAMs) has also shown flow enhancement, albeit at only a fraction of what has been observed in CNTs. Despite their potential applications, little research has been conducted on PAAMs’ hydrodynamic properties, and in this Article we present experimental results and theoretical models that explore the fluid flow behavior around and through these membranes. The experiments were conducted using an atomic force microscope (AFM) that pushed a solid silica particle against PAAMs that were characterized with different pore diameters. Furthermore, the PAAMs were classified as either closed or open, with the latter allowing fluid to pass through. The theoretical model developed to describe the experimental data incorporates Derjaguin–Landau–Verwey–Overbeek (DLVO) effects, cantilever drag, and hydrodynamic forces. By using the slip boundary condition for the hydrodynamic forces, we were able to fit the model to experimental findings and also demonstrate that the difference between closed and open PAAMs was negligible. The slip lengths did not correspond to any physical feature of the PAAMs, but our model does provide a simple yet effective means of describing the hydrodynamics for not only PAAMs but for membranes in general.
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DOI：
10.1016/j.colsurfa.2012.12.010
发表时间：
2013-03-05
影响因子：
5.2
作者：
Leese, Hannah;Bhurtun, Vivek;Mattia, Davide
通讯作者：
Mattia, Davide
纳米粒子分散体中接近壁的微粒上的水动力：观察与分离相关的有效粘度。
影响因子：
3.9
作者：
G. James;J. Walz
通讯作者：
J. Walz
影响因子：
56.9
作者：
MASUDA, H;FUKUDA, K
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FUKUDA, K
影响因子：
10.8
作者：
Whitby, Max;Cagnon, Laurent;Quirke, Nick
通讯作者：
Quirke, Nick
影响因子：
6.7
作者：
Lee, Kah Peng;Leese, Hannah;Mattia, Davide
通讯作者：
Mattia, Davide