Unusually stable liquid foams
Unusually stable liquid foams
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DOI：
10.1016/j.cis.2013.10.023
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发表时间：
2014-03-01
影响因子：
15.6
通讯作者：
Langevin, Dominique
中科院分区：
文献类型：
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作者：
Rio, Emmanuelle;Drenckhan, Wiebke;Langevin, Dominique
鉴于其众多的应用，获得稳定的液体泡沫是一个重要的问题。在其中的一些中，液体泡沫本身是令人感兴趣的，在其他中，液体泡沫充当用于产生固体泡沫的前体。在这篇简短的评论中，我们将对该领域的现有成果进行调查。这将包括由表面活性剂、蛋白质和颗粒稳定的泡沫。稳定性的起源与粗化、排水或聚结的减缓有关，并最终与它们的停止有关。这三种效应往往是相互关联的，在许多情况下，它们同时起作用并相互加强。如果泡沫的液体胶凝或固化，则可以阻止排水。凝胶化泡沫膜减缓聚结，并且如果膜变得非常厚和/或刚性，则可以阻止聚结。因此，这些机制在定性上很容易识别，但它们不太容易建模，以获得定量预测。减缓粗化要求非常厚或小的膜，并且在表面压缩模量大的情况下观察到其逮捕。起作用的机制的细节仍不清楚。(C)2013爱思唯尔有限公司版权所有。
Obtaining stable liquid foams is an important issue in view of their numerous applications. In some of these, the liquid foam in itself is of interest, in others, the liquid foam acts as a precursor for the generation of solid foam. In this short review, we will make a survey of the existing results in the area. This will include foams stabilised by surfactants, proteins and particles. The origin of the stability is related to the slowing down of coarsening, drainage or coalescence, and eventually to their arrest. The three effects are frequently coupled and in many cases, they act simultaneously and enhance one another. Drainage can be arrested if the liquid of the foam either gels or solidifies. Coalescence is slowed down by gelified foam films, and it can be arrested if the films become very thick and/or rigid. These mechanisms are thus qualitatively easy to identify, but they are less easy to model in order to obtain quantitative predictions. The slowing down of coarsening requests either very thick or small films, and its arrest was observed in cases where the surface compression modulus was large. The detail of the mechanisms at play remains unclear. (C) 2013 Elsevier B.V. All rights reserved.