Abstract:

The concentration of biologic surface active materials has a great influence on the foam properties of the solution with them. Foam properties include foaming ability and foam stability. In this work, foaming ability and foam stability were characterized by initial foam height and half-time of foam, respectively. The relational expression between the initial foam height of the solution with two surface active materials and their concentration bellow the critical micelle concentration (CMC) was determined by using the extended Szyszkowski equation and Rosen's empirical model. The relational expression between the half-time of foam of the solution with two surface active materials and their concentration bellow the CMC was established on the basis of the rules that the gravitational potential energy and the surface energy all decreased with the bubble breakup in the foam phase. An aqueous solution with bovine serum albumin (BSA) and lysozyme (LZM) was used as the simulation system to verify the accuracy of these relational expressions. The results showed that the two relational expressions could be used to accurately predict the foam properties of the solution with BSA and LZM. The effect of BSA on the foam properties of the solution was more significant than that of LZM.

Key words: foam, stability, foaming ability, surface tension, surface active material, foam property

摘要：

生物表面活性物质的浓度对其溶液的泡沫性能有很大的影响。泡沫性能包括起泡性和泡沫稳定性。本文以初始泡沫高度和泡沫半衰期分别表征了起泡性和泡沫稳定性。首先利用Szyszkowski扩展方程和Rosen的经验模型,导出了低于临界胶束浓度(CMC)时,两种表面活性物质混合溶液的初始泡沫高度与其各自浓度的关系式;然后根据泡沫相中溶液的重力势能和表面能随气泡破裂而减小的规律,建立了低于CMC时两种表面活性物质混合溶液的泡沫半衰期与其各自浓度的关系式;最后用牛血清白蛋白(BSA)和溶菌酶(LZM)作为实验物系考察了这两种关系式的准确性。结果表明这两种关系式能准确预测BSA和LZM混合溶液的泡沫性能。在BSA和LZM混合溶液中,BSA能显著影响溶液的泡沫性能,而LZM对溶液泡沫性能的影响小。

关键词: 泡沫, 稳定性, 起泡性, 表面张力, 表面活性物质, 泡沫性能