Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea; Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, United States(1).
Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea.
J Colloid Interface Sci. 2020 Jun 15;570:173-181. doi: 10.1016/j.jcis.2020.02.101. Epub 2020 Feb 26.
We test the validity of the Young-Laplace equation and Henry's law for sub-micron bubble suspensions, which has long been a questionable issue. Application of the two theories allows characterization of bubble diameter and gas molecule partitioning between gaseous and dissolved phases using two easily measurable variables: total gas content (C) and bubble volume concentration (BVC).
We measure C and BVC for sub-micron bubble suspensions generated from three pure gases, which allows calculation of bubble diameter for each suspension using the Young-Laplace equation and Henry's law. Uncertainties involved in the experimental measurements are assessed. Bubble size for each suspension is also directly measured using a dynamic light scattering (DLS) technique for comparison.
Applying the two theories we calculate that the bubble diameters are in the range of 304-518 nm, which correspond very well with the DLS-measured diameters. Sensitivity analyses demonstrate that the correspondence of the calculated and DLS-measured bubble diameters should take place only if the two theories are valid. The gas molecule partitioning analysis shows that >96% of gas molecules in the suspension exist as dissolved phase, which suggests the significance of the dissolved phase for applications of the bubble suspensions.
我们检验亚微米气泡悬浮液的 Young-Laplace 方程和 Henry 定律的有效性，长期以来这一直是一个有争议的问题。这两个理论的应用可以通过两个易于测量的变量来描述气泡直径和气相与溶解相间的气体分子分配：总气体含量 (C) 和气泡体积浓度 (BVC)。
我们测量了三种纯气体产生的亚微米气泡悬浮液的 C 和 BVC，这允许使用 Young-Laplace 方程和 Henry 定律为每个悬浮液计算气泡直径。评估了实验测量中涉及的不确定度。还使用动态光散射 (DLS) 技术直接测量每个悬浮液的气泡大小进行比较。
应用这两个理论，我们计算出气泡直径在 304-518nm 范围内，与 DLS 测量的直径非常吻合。敏感性分析表明，只有在这两个理论有效的情况下，计算出的和 DLS 测量的气泡直径才会相符。气体分子分配分析表明，悬浮液中超过 96%的气体分子以溶解相存在，这表明溶解相在气泡悬浮液的应用中具有重要意义。
