Influence of particle hydrophobicity on particle-assisted wetting.
Influence of particle hydrophobicity on particle-assisted wetting.
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DOI：
10.1021/la047858c
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发表时间：
2005-01
期刊：
影响因子：
--
通讯作者：
A. Ding;B. Binks;W. Goedel
中科院分区：
文献类型：
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作者：
A. Ding;B. Binks;W. Goedel
二氧化硅颗粒的表面性质显著影响其在颗粒辅助润湿中的效率。将一系列表面疏水性可控的小颗粒与非挥发油混合。将这些混合物涂在水面上，然后通过光聚合固化形成的结构，并用扫描电子显微镜进行观察。对于最亲水的颗粒，只有纯油形成的透镜，颗粒浸入水相中。最疏水的颗粒有助于形成由油和颗粒组成的稳定均匀混合层的斑块。在这些情况下，颗粒附着在空气-油以及油-水界面上。对于中等疏水性的颗粒，观察到透镜和混合层的斑块。这三种不同的观察结果证实，颗粒表面的疏水性决定了油在水面上的润湿行为。
The surface properties of silica particles significantly influence their efficiency in particle-assisted wetting. A series of small particles of controlled surface hydrophobicity was mixed with a nonvolatile oil. These mixtures were applied onto a water surface; the structures formed were subsequently solidified by photopolymerization and observed using scanning electron microscopy. For the most hydrophilic particles, only lenses of pure oil formed, with the particles being submerged into the aqueous phase. The most hydrophobic particles help to form patches of stable homogeneous mixed layers composed of oil and particles. In these cases the particles adhere to the air-oil as well as to the oil-water interfaces. For particles with intermediate hydrophobicity, lenses and patches of mixed layers were observed. These three different observations verify that the hydrophobicity of the particle surface determines the wetting behavior of the oil at the water surface.