The Aging of Liquid Foam by Interbubble Gas Diffusion

研究了气泡间气体对液体泡沫的老化作用 扩散 这种自发现象不仅改变了泡沫 尺寸和减少可用的表面，但是，有足够的时间， 导致存在的气泡数量减少， 泡沫的最终聚结。 实验方法采用两个 新技术。 第一个是非常缓慢的旋转， 围绕水平轴发泡。 第二种技术阻止了进一步的衰老 通过非常快速地硬化泡沫并产生非气体 聚合和/或交联。 泡沫将通过以下方式产生： 将预饱和氮气鼓泡通过适当的液体混合物。 在所得泡沫老化和硬化后，其体积气体 分数，气泡尺寸和形状分布将被测量 在泡沫内的取样平面进行显微照相， 为此目的进行切割和抛光。

Research is conducted on the aging of liquid foam by interbubble gas diffusion. This spontaneous phenomenon not only changes the bubble sizes and reduces the available surface, but, with sufficient time, leads to a reduction in the number of bubbles present and hence to ultimate coalescence of the foam. The experimental method employs two novel techniques. The first involves the very slow rotation of the foam about a horizontal axis. The second technique stops further aging by means of the very rapid hardening of the foam with nongas-producing polymerization and/or cross linkage. The foam will be generated by bubbling presaturated nitrogen through an appropriate liquid mixture. After the resulting foam is aged and hardened, its volumetric gas fraction, and bubble size and shape distributions will be measured photomicrographically at sampling planes within the foam that will be cut and polished for the purpose.