Influence of surfactant transport suppression on dynamic contact angle hysteresis
Influence of surfactant transport suppression on dynamic contact angle hysteresis
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DOI：
10.1007/s00396-012-2759-y
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发表时间：
2013-02-01
影响因子：
2.4
通讯作者：
Auernhammer, Gunter K.
中科院分区：
文献类型：
--
作者：
Fell, Daniela;Pawanrat, Ngamjarassrivichai;Auernhammer, Gunter K.
在转鼓装置中研究了十六烷基三甲基溴化铵（CTAB）分子的局部和非局部输运过程对动态接触角和接触角滞后的影响。通过可移动屏障选择性地阻碍表面或体输运，分析了表面活性剂长程输运的影响。随着表面活性剂传输的阻碍的增加，后退接触角在CTAB存在下的所有提取速度下减小。纯水对照实验不受屏障存在的影响。因此，动态接触角不仅受到靠近接触线的马兰戈尼应力等短程效应的影响，而且还受到靠近后退和前进接触线的区域之间的长程传输过程（如扩散和平流）的影响。
The influence of local and nonlocal transport processes of cetyltrimethylammonium bromide (CTAB) molecules on dynamic contact angles and contact angle hysteresis was studied in a rotating drum setup. The influence of long-range surfactant transport was analyzed by hindering selectively the surface or the bulk transport via movable barriers. With increasing hindrance of the surfactant transport, the receding contact angle decreased at all withdrawing velocities in the presence of CTAB. The control experiment with pure water was unaffected by the presence of the barriers. Dynamic contact angles are, therefore, not only influenced by short-range effects like Marangoni stresses close to the contact line, but also by long-range transport processes (like diffusion and advection) between the regions close to the receding and advancing contact lines.