Influence of substrate roughness on particle adhesion and concentration
Influence of substrate roughness on particle adhesion and concentration
复制标题
基材粗糙度对颗粒粘附和浓度的影响
DOI：
10.1007/s42461-021-00521-9
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Sansao, B.M.B.
中科院分区：
文献类型：
--
作者：
Sansao, B.M.B.
在这项研究中，研究了颗粒与不同粗糙度的衬底的相互作用。控制颗粒表面处理、相对湿度(RH)和表面粗糙度水平，以通过施加去除力来实现不同颗粒的分离。使用了三种不同的方法来重复粗糙表面。最初，玻璃圆盘被激光雕刻以产生可复制的、可控制的粗糙度基板。然而，激光雕刻法产生的表面特征在规模上比颗粒大得多。这些规模的差异使得生产的底物对这项研究没有价值。研究的第二种诱导可重现衬底粗糙度的选择是使用已知粒度的砂纸刮擦玻璃盘。建立可重复粗糙度的第三种方法是使用精细的不锈钢丝网基板。在研磨玻璃圆盘试验中，等离子体清洗(亲水)玻璃微珠的界面能在40%RH处有很大的变化，表现出颗粒与基材之间接触面积的不均匀。随着相对湿度的增大，亲水粒子的界面能增加，但没有观察到这一行为。此外，比较亲水颗粒和疏水颗粒的界面能结果，没有发现有明显界面能差异的区域。在不锈钢网目衬底的情况下，网目粗糙度和颗粒尺寸是相当的。因此，较小的颗粒比较大的颗粒与基材有更大的接触面积。对于等离子体清洗(亲水性)小球，当相对湿度在46%~85%之间时，平均回收率为92.5%。对于疏水性小球，当相对湿度在46%~75%之间时，平均回收率为19.0%。因此，颗粒的疏水特性影响了其与网状衬底的较低相互作用。可以利用回收率的差异来实现基于粘附力的颗粒分离。
In this research study, the interaction of particles with substrates of different roughness magnitude was investigated. Particle surface treatment, relative humidity (RH), and surface roughness levels were controlled in order to achieve separation of different particles by applying removal forces. Three different approaches to reproducibly roughen surfaces were used. Initially, glass disks were laser engraved to create a reproducible, controlled roughness substrate. However, the laser engraving method produced surface features that were much greater in scale than the particles. These scale differences were such that the substrates produced were not of value to this research. The second option investigated to induce reproducible substrate roughness was to scratch the glass disk using sandpapers of known grain size. A third approach to establish reproducible roughness was to use fine stainless-steel wire mesh substrates. In tests with sanded glass disks, the interfacial energy of plasma-cleaned (hydrophilic) glass beads had a high variation at 40% RH, showing non-uniformity of area of contact between particles and substrates. As the RH increased, it was expected that the interfacial energy of hydrophilic particles would increase, but this behavior was not observed. In addition, comparing the interfacial energy results of hydrophilic particles with hydrophobic particles, a region with significant interfacial energy difference was not identified. In the case of the stainless-steel mesh substrate, the mesh asperities and particle dimensions were comparable. Thus, the smaller particles had more area of contact with the substrate than the larger particles. For the plasma-cleaned (hydrophilic) beads, the recovery values had an average of 92.5% recovery when the RH was between 46 and 85%. For the hydrophobic beads, the average recovery was 19.0% when the RH was between 46 and 75%. Thus, the hydrophobic characteristic of the particle influenced its lower interaction with the mesh substrate. The difference in recovery can be exploited to achieve separation of particles based upon adhesive forces.
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DOI：
--
发表时间：
2012
期刊：
--
影响因子：
--
作者：
D. I. Verrelli;W. Bruckard;P. Koh;M. Schwarz;B. Follink
通讯作者：
D. I. Verrelli;W. Bruckard;P. Koh;M. Schwarz;B. Follink
影响因子：
4.8
作者：
Bernardo Moreno Baqueiro Sansao;J. Kellar;W. Cross;A. Romkes
通讯作者：
Bernardo Moreno Baqueiro Sansao;J. Kellar;W. Cross;A. Romkes
影响因子：
5.2
作者：
Zafar, U.;Hare, C.;Ghadiri, M.
通讯作者：
Ghadiri, M.
影响因子：
--
作者：
R. Pohrt;V. Popov
通讯作者：
V. Popov
影响因子：
5.2
作者：
Sansao, Bernardo Moreno Baqueiro;Kellar, Jon J.;Romkes, Albert
通讯作者：
Romkes, Albert