论文标题
单层粘度在Langmuir薄膜孔闭合动力学中的作用
The role of monolayer viscosity in Langmuir film hole closure dynamics
论文作者
论文摘要
我们重新检查了Alexander等人提出的模型。 （2006年），用于关闭位于Stokesian亚流体上的分子薄薄膜中的圆形孔。为简单起见，他们的模型假设表面相是无粘性的，这会导致结果是，腔面积以恒定速率下降，由边缘张力与亚荧光粘度的比率确定。我们重新制定了问题，可以正规化单层粘度。分析了粘度依赖于孔动力学的校正，即使单层粘度很小，也被认为是非平凡的。当孔半径与Saffman-Delbruck的长度相当时，这些校正可能解释了实验数据从理论预测的偏离。通过拟合，我们发现边缘张力可能比这些宽松假设下报道的先前报道的大约八倍（〜5.5 pn）。
We re-examine the model proposed by Alexander et al. (2006) for the closing of a circular hole in a molecularly thin incompressible Langmuir film situated on a Stokesian subfluid. For simplicity their model assumes that the surface phase is inviscid which leads to the result that the cavity area decreases at a constant rate determined by the ratio of edge tension to subfluid viscosity. We reformulate the problem, allowing for a regularizing monolayer viscosity. The viscosity-dependent corrections to the hole dynamics are analyzed and found to be nontrivial, even when the monolayer viscosity is small; these corrections may explain the departure of experimental data from the theoretical prediction when the hole radius becomes comparable to the Saffman-Delbruck length. Through fitting, we find the edge tension could be as much as eight times larger (~5.5 pN) than previously reported under these relaxed assumptions.
