EFFECT OF POLYTETRAFLUOROETHYLENE PARTICLES ON THE FOAMABILITY OF AQUEOUS SURFACTANT SOLUTIONS
EFFECT OF POLYTETRAFLUOROETHYLENE PARTICLES ON THE FOAMABILITY OF AQUEOUS SURFACTANT SOLUTIONS
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DOI：
10.1016/0021-9797(79)90085-7
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发表时间：
1979-01-01
影响因子：
9.9
通讯作者：
GARRETT, PR
中科院分区：
文献类型：
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作者：
GARRETT, PR
研究表明，PTFE 颗粒的存在可以减少表面活性剂溶液剧烈摇动时产生的泡沫量。 PTFE 是一种惰性且疏水的材料。因此，实验证明，不稳定的表面张力梯度的形成并不是消泡行为的必要条件。简单的计算表明，薄膜中存在的疏水材料颗粒原则上可能会自发反湿形成孔，这必然导致薄膜破裂。孔形成的关键条件取决于接触角和颗粒形状。颗粒尺寸是一个隐含的考虑因素，因为颗粒的最小尺寸必须大约等于孔形成之前的膜厚度。该消泡机理与有关 PTFE 颗粒对表面活性剂溶液起泡性影响的所有实验观察结果一致。
It has been shown that the presence of PTFE particles may reduce the amount of foam which can be generated by vigorous shaking of surfactant solutions. PTFE is an inert and hydrophobic material. The experiments have therefore demonstrated that the formation of destabilizing surface tension gradients is not a necessary condition for antifoam behavior.Simple calculations have demonstrated that particles of hydrophobic material present in thin films may in principle spontaneously dewet to form a hole which would necessarily lead to film rupture. The critical condition for hole formation is shown to be dependent upon contact angle and particle shape. Particle size is an implicit consideration in that the smallest dimension of the particle must be approximately equal to the film thickness before hole formation can occur. This antifoam mechanism is shown to be consistent with all the experimental observations concerning the effect of PTFE particles on the foamability of surfactant solutions.