Effect of particle hydrophobicity on the properties of liquid water marbles
Effect of particle hydrophobicity on the properties of liquid water marbles
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DOI：
10.1039/c3sm50421b
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发表时间：
2013-05
期刊：
影响因子：
3.4
通讯作者：
D. Zang;Zhen Chen;Yongjia Zhang;Kejun Lin;Xingguo Geng;B. Binks
中科院分区：
文献类型：
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作者：
D. Zang;Zhen Chen;Yongjia Zhang;Kejun Lin;Xingguo Geng;B. Binks
我们研究了不同疏水性的二氧化硅纳米粒子涂覆的液态水大理石的静态性能和动态行为。静态性质通过大理石的高度和直径随大理石体积的变化来表征，从而可以获得大理石的有效表面张力γ eff。液体弹珠的动力学行为包括它们在固体表面上的撞击和它们在两个平行玻璃板之间的压缩。用中等疏水性颗粒涂覆的大理石表现出最大的γ eff值和增强的机械鲁棒性。由于撞击引起的颗粒在气-水界面上的脱离或重排，液态水弹珠的动态表面张力γ d与γ eff的大小不同。实际上，γ d在确定冲击和回弹过程中的接触时间和振荡周期方面起着重要的作用。结果表明，大理石表面的静态有效表面张力和动态有效表面张力均取决于大理石表面包覆颗粒的疏水性。
We study both the static properties and dynamic behavior of liquid water marbles coated with silica nanoparticles of varied hydrophobicity. The static properties are characterized by the variation of marble height and diameter with increasing marble volume, such that the effective surface tension γeff of the marble can be obtained. The dynamic behavior of liquid marbles includes their impingement on a solid surface and their compression between two parallel glass plates. Marbles coated with particles of intermediate hydrophobicity exhibit maximum γeff values and enhanced mechanical robustness. Due to particle detachment from or particle rearrangement at the air–water interface caused by the impact, the dynamic surface tensions γd of liquid water marbles are different in magnitude to those of γeff. In fact, γd plays an important role in determining the contact time and oscillation period during the impact and rebound processes. Our results show that both the static effective and dynamic surface tension depend on the hydrophobicity of the particles coating the marble surfaces.