Bouteau Murielle, Cantin Sophie, Benhabib Fewzi, Perrot Françoise
Laboratoire de Physico-Chimie des Polymères et des Interfaces (LPPI, EA 2528), Université de Cergy-Pontoise, Neuville sur Oise, 95 031 Cergy-Pontoise Cedex, France.
J Colloid Interface Sci. 2008 Jan 1;317(1):247-54. doi: 10.1016/j.jcis.2007.09.042. Epub 2007 Sep 20.
The sliding behavior of liquid droplets on inclined Langmuir-Blodgett surfaces was investigated. The critical sliding angle defined as the tilt angle of the surface at which the drop slides down as well as the advancing and receding contact angles was measured for five different liquids on five surfaces. In addition, the contact line geometry was analyzed at critical sliding angle. The experimental relationship between the surface tension forces resulting from contact angle hysteresis and the weight of the drop was compared to theoretical predictions. Even though the shape of the drop bases was found as skewed ellipses, a model assuming parallel-sided elongated drops is shown to describe reasonably the experimental values. This result probably indicates the main influence of the capillary forces at the rear and front edges of the drop with respect to that exerted on the lateral sides.
研究了液滴在倾斜的朗缪尔-布洛杰特表面上的滑动行为。测量了五种不同液体在五个表面上的临界滑动角（定义为液滴下滑时表面的倾斜角）以及前进接触角和后退接触角。此外，还分析了临界滑动角下的接触线几何形状。将由接触角滞后产生的表面张力与液滴重量之间的实验关系与理论预测进行了比较。尽管发现液滴底部形状为偏斜椭圆，但一个假设为平行边细长液滴的模型被证明能够合理地描述实验值。这一结果可能表明，相对于作用在液滴侧面的力，液滴前后边缘的毛细力具有主要影响。
