琼脂凝胶表面上的异常扩展与马兰戈尼流。

Anomalous spreading with Marangoni flow on agar gel surfaces.

机构信息

Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan.

出版信息

Langmuir. 2012 Feb 28;28(8):3799-806. doi: 10.1021/la2049597. Epub 2012 Feb 16.

DOI:10.1021/la2049597

PMID:22280299

Abstract

We have experimentally observed anomalous spreading of aqueous alcohol solutions on flat and rough fractal agar gel surfaces. On flat agar gel surfaces, extremely fast spreading [θ(D)(t) ∝ t(-0.92)] that differs from Tanner's law [θ(D)(t) ∝ t(-0.3)] was observed when the liquid contained over 9 wt % of 1-propanol in which strong Marangoni flow was observed as a fluctuation on the liquid surface. However, on fractal gel surfaces, different spreading dynamics [θ(D)(t) ∝ t(-0.58)] were observed, although Marangoni flow still occurred. We found the surface-dependent spreading can be discussed in terms of competition between Marangoni flow and the pinning effect due to surface roughness.

摘要

我们已经在实验上观察到水醇溶液在平坦和粗糙分形琼脂凝胶表面上的异常扩展。在平坦的琼脂凝胶表面上，当液体中含有超过 9wt%的 1-丙醇时，观察到非常快速的扩展[θ(D)(t)∝t(-0.92)]，这与 Tanner 定律[θ(D)(t)∝t(-0.3)]不同，在这种情况下，观察到了表面上的强 Marangoni 流作为波动。然而，在分形凝胶表面上，尽管仍然发生了 Marangoni 流，但观察到了不同的扩展动力学[θ(D)(t)∝t(-0.58)]。我们发现，表面依赖性扩展可以用 Marangoni 流和表面粗糙度引起的钉扎效应之间的竞争来讨论。