TIPs, Université Libre de Bruxelles C.P. 165/67, 1050 Brussels, Belgium, EU.
Phys Rev Lett. 2012 Dec 28;109(26):264502. doi: 10.1103/PhysRevLett.109.264502. Epub 2012 Dec 27.
An antibubble is a spherical air film that is immersed in a surfactant mixture and drains under the action of hydrostatic pressure. A dynamical model of this film is proposed that accounts for the surface shear viscosity effects in the case of purely viscous interfaces, which applies for surfactants whose adsorption rate is much larger than advection rate and at a concentration much above the critical micelle concentration. Our model shows that the lifetime of the antibubbles in this case increases with surface shear viscosity, denoted ε, whose value is measured independently, all in agreement with experimental measurements. We also found that the critical thickness, h(c), at film rupture due to van der Waals interactions slightly depends on the surface shear viscosity, namely h(c) ∝ ε(1/6).
气泡防止剂是一种球形气膜，沉浸在表面活性剂混合物中，并在静水压力的作用下排出。提出了一个考虑纯粘性界面的表面剪切粘度影响的薄膜动力学模型，适用于那些吸附速率远大于输运速率，且浓度远高于临界胶束浓度的表面活性剂。我们的模型表明，在这种情况下，气泡防止剂的寿命随表面剪切粘度ε的增加而增加，ε的值可以通过独立测量得到，这与实验测量结果一致。我们还发现，由于范德华相互作用导致的薄膜破裂的临界厚度 h(c) 略微依赖于表面剪切粘度，即 h(c)∝ε(1/6)。
