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Hydrodynamic versus Surface Interaction Impacts of Roughness in Closing the Gap between Favorable and Unfavorable Colloid Transport Conditions
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-02-22 , DOI: 10.1021/acs.est.8b06162 Anna Rasmuson 1 , Kurt VanNess 1 , Cesar A. Ron 1 , William P. Johnson 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-02-22 , DOI: 10.1021/acs.est.8b06162 Anna Rasmuson 1 , Kurt VanNess 1 , Cesar A. Ron 1 , William P. Johnson 1
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Recent experiments revealed that roughness decreases the gap in colloid attachment between favorable (repulsion absent) and unfavorable (repulsion present) conditions through a combination of hydrodynamic slip and surface interactions with asperities. Hydrodynamic slip was calibrated to experimentally observed tangential colloid velocities, demonstrating that slip length was equal to maximum asperity relief, thereby providing a functional relationship between slip and roughness metrics. Incorporation of the slip length in mechanistic particle trajectory simulations yielded the observed modest decrease in attachment over rough surfaces under favorable conditions, with the observed decreased attachment being due to reduced colloid delivery rather than decreased attraction. Cumulative interactions with multiple asperities acting within the zone of colloid–surface interaction were unable to produce the observed dramatic increased attachment and decreased reversibility with increased roughness under unfavorable conditions, necessitating inclusion of nanoscale attractive heterogeneity that was inferred to have codeveloped with roughness. Simulated attachment matched experimental observations when the spatial frequency of larger heterodomains (nanoscale zones of attraction) increased disproportionately relative to smaller heterodomains as roughness increased, whereas attachment was insensitive to asperity properties, including the number of interactions per asperity and asperity height; colloid detachment simulations were highly sensitive to these parameters. These cumulative findings reveal that hydrodynamic slip moderately decreases colloid bulk delivery, nanoscale heterogeneity dramatically enhances colloid attachment, and multiple interactions among asperities decrease detachment from rough surfaces.
中文翻译：
流体动力学对表面相互作用的影响，在缩小胶体运输条件的有利和不利条件之间的差距
最近的实验表明，粗糙度通过结合流体动力学滑移和表面与凹凸不平的作用，减小了在良好（不存在排斥）和不利（存在排斥）条件之间的胶体附着间隙。将流体动力滑移校准到实验观察到的切向胶体速度，表明滑移长度等于最大凹凸消除，从而提供了滑移和粗糙度度量之间的函数关系。在机械条件下，将滑移长度纳入机械运动轨迹模拟中，可以观察到在有利条件下在粗糙表面上附着力的适度降低，并且观察到的附着力降低是由于胶体传递减少而不是吸引力降低所致。在不利的条件下，随着在胶体-表面相互作用区域内起作用的多个粗糙体的累积相互作用，无法产生观察到的显着增加的附着力和可逆性，并且随着粗糙度的增加而降低了可逆性，因此必须包含被认为与粗糙度共同发展的纳米级吸引力异质性。当粗糙度增加时，较大的杂域（纳米级吸引区）的空间频率相对于较小的杂域的空间频率成比例增加时，模拟附着与实验观察结果相符，而附着对粗糙特性不敏感，包括每个粗糙和粗糙高度的相互作用数; 胶体脱离模拟对这些参数高度敏感。
更新日期：2019-02-22
中文翻译：
流体动力学对表面相互作用的影响，在缩小胶体运输条件的有利和不利条件之间的差距
最近的实验表明，粗糙度通过结合流体动力学滑移和表面与凹凸不平的作用，减小了在良好（不存在排斥）和不利（存在排斥）条件之间的胶体附着间隙。将流体动力滑移校准到实验观察到的切向胶体速度，表明滑移长度等于最大凹凸消除，从而提供了滑移和粗糙度度量之间的函数关系。在机械条件下，将滑移长度纳入机械运动轨迹模拟中，可以观察到在有利条件下在粗糙表面上附着力的适度降低，并且观察到的附着力降低是由于胶体传递减少而不是吸引力降低所致。在不利的条件下，随着在胶体-表面相互作用区域内起作用的多个粗糙体的累积相互作用，无法产生观察到的显着增加的附着力和可逆性，并且随着粗糙度的增加而降低了可逆性，因此必须包含被认为与粗糙度共同发展的纳米级吸引力异质性。当粗糙度增加时，较大的杂域（纳米级吸引区）的空间频率相对于较小的杂域的空间频率成比例增加时，模拟附着与实验观察结果相符，而附着对粗糙特性不敏感，包括每个粗糙和粗糙高度的相互作用数; 胶体脱离模拟对这些参数高度敏感。
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