Effect of membrane surface roughness on colloid-membrane DLVO interactions
Effect of membrane surface roughness on colloid-membrane DLVO interactions
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DOI：
10.1021/la027083c
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发表时间：
2003-05-27
期刊：
影响因子：
3.9
通讯作者：
Elimelech, M
中科院分区：
文献类型：
--
作者：
Hoek, EMV;Bhattacharjee, S;Elimelech, M
近期的实验研究表明，胶体颗粒与聚合物膜表面的相互作用受膜表面形态（粗糙度）的影响。为了更好地理解表面粗糙度对胶体沉积和污染的影响，开发用于预测胶体颗粒与粗糙膜表面之间的德亚金 - 朗道 - 弗韦 - 奥弗比克（DLVO）相互作用能的模型是至关重要的。我们提出了一种利用从原子力显微镜粗糙度分析得出的统计参数重建聚合物膜表面数学拓扑结构的技术。采用表面单元积分技术来计算球形胶体颗粒与模拟（重建）膜表面之间的DLVO相互作用。预测结果表明，胶体颗粒与粗糙膜之间的排斥作用能垒低于光滑膜的相应能垒。能垒的降低与表面粗糙度的大小密切相关。进一步表明，由膜表面粗糙度形成的凹谷会产生低相互作用能的势阱，胶体颗粒可能优先在其中沉积。
Recent experimental investigations suggest that interaction of colloidal particles with polymeric membrane surfaces is influenced by membrane surface morphology (roughness). To better understand the consequences of surface roughness on colloid deposition and fouling, it is imperative that models for predicting the Deljaguin-Landau-Verwey-Overbeek (DLVO) interaction energy between colloidal particles and rough membrane surfaces be developed. We present a technique of reconstructing the mathematical topology of polymeric membrane surfaces using statistical parameters derived from atomic force microscopy roughness analyses. The surface element integration technique is used to calculate the DLVO interactions between spherical colloidal particles and the simulated (reconstructed) membrane surfaces. Predictions show that the repulsive interaction energy barrier between a colloidal particle and a rough membrane is lower than the corresponding barrier for a smooth membrane. The reduction in the energy barrier is strongly correlated with the magnitude of surface roughness. It is further suggested that the valleys created by the membrane surface roughness produce wells of low interaction energy in which colloidal particles may preferentially deposit.