The Aging of Liquid Foam by Interbubble Gas Diffusion

采用气泡间气体扩散法对液态泡沫的老化进行了研究。这种自发现象不仅改变了气泡的大小，减少了可用表面，而且在足够的时间内，减少了气泡的数量，从而导致泡沫的最终结合。实验方法采用了两种新技术。第一种是泡沫绕水平轴旋转的速度非常慢。第二种技术通过产生聚甲基丙烯酸甲酯和/或交联剂的泡沫塑料的非常快速的硬化来防止进一步老化。泡沫将通过将预饱和的氮气通过适当的液体混合物鼓泡而产生。在产生的泡沫老化和硬化后，其体积气体分数以及气泡大小和形状分布将在将被切割和抛光的泡沫内的取样平面上进行显微摄影测量。

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.