Colloidal interactions between model foulants and engineered surfaces: Interplay between roughness and surface energy
Colloidal interactions between model foulants and engineered surfaces: Interplay between roughness and surface energy
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DOI：
10.1016/j.ceja.2021.100138
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Thomas Horseman;Zhangxin Wang;Shihong Lin
中科院分区：
文献类型：
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作者：
Thomas Horseman;Zhangxin Wang;Shihong Lin
浸没表面上的污垢是膜、热交换器和海洋船舶的主要限制因素，因为它引起质量和热传递阻力，从而增加操作成本并导致系统故障。虽然表面粗糙度对污垢的作用已被广泛研究，但表面粗糙度对污垢的具体影响在文献中存在争议。在这项研究中，我们采用基于原子力显微镜的力谱与两个模型的胶体探针，以阐明表面粗糙度对污垢表面相互作用的作用。具体来说，我们量化的强度和特征长度的胶体探针和亲水性和疏水性表面之间的相互作用，有和没有表面纹理。我们发现，亲水性表面通常比疏水性表面更不易于污垢粘附，并且增加亲水性表面的粗糙度减轻污垢粘附。相比之下，我们发现，增加粗糙度的疏水表面增加有吸引力的污垢表面的相互作用，因此，其结垢倾向。基于这项研究的结果，开发表面的污垢阻力的影响也进行了检查。
Fouling on submerged surfaces is a major limiting factor for membranes, heat exchangers, and marine vessels as it induces mass and heat transfer resistances that increase operating costs and lead to system failures. While the role of surface roughness on fouling has been extensively studied, the specific effect of surface roughness on fouling is debated in literature. In this study, we employed force spectroscopy based on atomic force microscopy with two model colloidal probes to elucidate the role of surface roughness on foulant-surface interactions. Specifically, we quantified the strength and characteristic lengths of the interactions between the colloidal probes and hydrophilic and hydrophobic surfaces with and without surface texture. We found that hydrophilic surfaces are generally less prone to foulant adhesion than hydrophobic surfaces and that increasing roughness of a hydrophilic surface mitigates foulant adhesion. In comparison, we found that increased roughness of a hydrophobic surface increases the attractive foulant-surface interaction, and thus, its fouling propensity. Based on the results from this study, the implications for developing surfaces with fouling resistance are also examined.