Droplets on liquids and their journey into equilibrium

被引：22

作者：

Bommer, Stefan ^{[1
]}

Cartellier, Florian ^{[1
]}

Jachalski, Sebastian ^{[2
]}

Peschka, Dirk ^{[2
]}

Seemann, Ralf ^{[1
,3
]}

Wagner, Barbara ^{[2
,4
]}

机构：

[1] Univ Saarland, D-66123 Saarbrucken, Germany

[2] Weierstrass Inst, D-10117 Berlin, Germany

[3] Max Planck Inst Dynam & Self Org, D-37073 Gottingen, Germany

[4] Tech Univ Berlin, Inst Math, D-10623 Berlin, Germany

来源：

EUROPEAN PHYSICAL JOURNAL E | 2013年 / 36卷 / 08期

关键词：

FILM; TRANSITION; STABILITY; DYNAMICS; SURFACE;

D O I：

10.1140/epje/i2013-13087-x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The morphological path of droplets on a liquid substrate towards equilibrium is investigated experimentally and theoretically. The droplets emerge in the late stage of a dewetting process of short chained polystyrene (PS) dewetting from liquid polymethyl-methacrylate (PMMA). The three-dimensional droplet profiles are obtained experimentally by combining the in situ imaged PS/air interface during equilibration and the ex situ imaged PS/PMMA interface after removal of the PS by a selective solvent. Numerically the transient drop shapes are calculated by solving the thin-film equation in lubrication approximation using the experimentally determined input parameter like viscosity, film thickness and surface tensions. The numerically obtained droplet morphologies and time scales agree very well with the experimental drop shapes. An unexpected observation is that droplets with identical volumes synchronise their motion and become independent of the initial geometry long time before equilibrium is reached.

引用

页数：10

共 34 条

[1] INTERFACIAL-TENSION OF IMMISCIBLE POLYMER BLENDS - TEMPERATURE AND MOLECULAR-WEIGHT DEPENDENCE [J].