Rheology of capillary foams
Rheology of capillary foams
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DOI：
10.1039/d0sm00384k
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发表时间：
2020-08-07
期刊：
影响因子：
3.4
通讯作者：
Behrens, Sven H.
中科院分区：
文献类型：
--
作者：
Okesanjo, Omotola;Tennenbaum, Michael;Behrens, Sven H.
水性泡沫无处不在;它们出现在化妆品、食品和能源行业的产品和工艺中。泡沫的广泛适用性是由于其固有的粘性和弹性特性;例如，泡沫由于其高粘度而被用作强化采油中的钻井液。最近，发现了所谓的毛细泡沫：一类在静态条件下具有优异稳定性的泡沫，其流动特性迄今为止尚未被探索。这些泡沫的独特结构，包含油包泡和油桥颗粒的凝胶网络，预计会影响泡沫流变学。在这项工作中，我们报告的第一组毛细管泡沫的流变数据。通过振荡剪切和稳态剪切实验研究了毛细泡沫的粘弹性。我们比较我们的毛细管泡沫的流变性能的结果，为其他水性泡沫的报告。我们发现，毛细管泡沫，具有低的气体体积分数，表现出持久的流变稳定性以及屈服行为，这是令人想起的表面活性剂泡沫与高气体体积分数。
Aqueous foams are ubiquitous; they appear in products and processes that span the cosmetics, food, and energy industries. The versatile applicability of foams comes as a result of their intrinsic viscous and elastic properties; for example, foams are exploited as drilling fluids in enhanced oil recovery for their high viscosity. Recently, so-called capillary foams were discovered: a class of foams that have excellent stability under static conditions and whose flow properties have so far remained unexplored. The unique architecture of these foams, containing oil-coated bubbles and a gelled network of oil-bridged particles, is expected to affect foam rheology. In this work, we report the first set of rheological data on capillary foams. We study the viscoelastic properties of capillary foams by conducting oscillatory and steady shear tests. We compare our results on the rheological properties of capillary foams to those reported for other aqueous foams. We find that capillary foams, which have low gas volume fractions, exhibit long lasting rheological stability as well as a yielding behavior that is reminiscent of surfactant foams with high gas volume fractions.