Dissolution arrest and stability of particle-covered bubbles
Dissolution arrest and stability of particle-covered bubbles
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DOI：
10.1103/physrevlett.99.188301
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发表时间：
2007-11-02
影响因子：
8.6
通讯作者：
Stone, Howard A.
中科院分区：
文献类型：
--
作者：
Abkarian, Manouk;Subramaniam, Anand Bala;Stone, Howard A.
实验表明，覆盖着单分散聚苯乙烯颗粒的气泡，颗粒与气泡的半径比约为0.1，演变形成多面多面体形状，在空气饱和的水中溶解是稳定的。我们进行表面EVOLVER模拟，并发现，小面粒子覆盖的气泡代表了当地的最低能量。在刻面状态下，拉普拉斯超压消失，这与气泡压力-体积曲线的正斜率一起确保相稳定性。颗粒之间的排斥相互作用导致气液界面曲率的减小，这是阻止溶解并稳定气泡的机制。
Experiments show that bubbles covered with monodisperse polystyrene particles, with particle to bubble radius ratios of about 0.1, evolve to form faceted polyhedral shapes that are stable to dissolution in air-saturated water. We perform SURFACE EVOLVER simulations and find that the faceted particle-covered bubble represents a local minimum of energy. At the faceted state, the Laplace overpressure vanishes, which together with the positive slope of the bubble pressure-volume curve, ensures phase stability. The repulsive interactions between the particles cause a reduction of the curvature of the gas-liquid interface, which is the mechanism that arrests dissolution and stabilizes the bubbles.