Nano-scaled roughness effect on air bubble-hydrophilic surface adhesive strength
Nano-scaled roughness effect on air bubble-hydrophilic surface adhesive strength
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DOI：
10.1016/j.colsurfa.2020.125228
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Donghui Wang;Zhanglei Zhu;Bin Yang;W. Yin;J. Drelich
中科院分区：
文献类型：
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作者：
Donghui Wang;Zhanglei Zhu;Bin Yang;W. Yin;J. Drelich
固体表面粗糙度影响其与水中气泡的相互作用。在这里，我们使用微电子天平摄像系统研究了表面纳米级(随机)粗糙度对气泡与天然亲水性赤铁矿和黄铁矿表面附着强度的影响。表面粗糙度以均方根粗糙度(RMS3-260 nm)量化。记录值包括气泡与矿物的附着力、水接触角和气泡在气泡附着和扩散、最大附着和脱离阶段的气泡底部直径。结果证实，随着纳米级粗糙度的增加，亲水性表面对气泡的粘附力减弱。研究表明，附着力与均方根粗糙度之间存在线性关系。粘附力与接触角及其正弦函数呈线性相关，为纳米尺度表面粗糙度具有随机性的气泡与亲水表面的粘合以表面张力为主提供了证据。
Surface roughness of solid affects its interactions with gas bubbles in water. Here, we investigate the effect of surface nano-scaled (random) roughness, quantified with the root-mean-square (RMS) roughness from about 3 to 260 nm, on the adhesive strength of air bubble with natural hydrophilic hematite and pyrite surfaces using a microelectronic balance-camera system. The recorded values include bubble-mineral adhesion forces, water contact angles, and bubble base diameters during stages of air bubble attachment and spreading, maximum adhesion, and detachment. The results confirm weakening of adhesive forces for air bubble with hydrophilic surfaces of increasing nano-scale roughness. The study reveals a linear dependency between adhesion force and RMS roughness. The adhesion force was also found to be in a linear correlation with contact angle and its sine function, providing evidence for the surface tension force dominance in adhesion of bubble to hydrophilic surface with nano-scaled surface roughness characteristics of random nature.