Line Tension Measurements through Drop Size Dependence of Contact Angle.
Line Tension Measurements through Drop Size Dependence of Contact Angle.
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DOI：
10.1006/jcis.1998.5562
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发表时间：
1998-09
影响因子：
9.9
通讯作者：
A. Amirfazli;D. Kwok;J. Gaydos;A. Neumann
中科院分区：
文献类型：
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作者：
A. Amirfazli;D. Kwok;J. Gaydos;A. Neumann
用不同的有机液体进行了实验，研究了1-十八烷基乙炔（HS（CH2）17CH3）在金表面自组装单分子膜（SAM）表面上接触角的液滴尺寸依赖性。用轴对称液滴形状分析剖面法（ADSA-P）测量了水蒸气饱和空气中固着液滴的低速动态前进接触角。使用每种液体的最少八个单独制备的SAM表面进行实验。虽然在测量的接触角存在一定程度的分散，观察到的一般趋势是，接触角下降的座滴的三相线的半径从约1毫米增加到5毫米。为了获得更好的整体趋势，接触角从所有的个人运行每种液体的平均在相应的半径。随后，从这些实验的平均结果进行解释，使用修改后的杨氏方程。有人发现，液滴尺寸的接触角的依赖性是由于一个积极的线张力。线张力值约为1 µ J/m，液体表面张力越高，线张力值越大。版权所有1998学术出版社。
Experiments with different organic liquids have been conducted to study the drop size dependence of the contact angles on a self-assembled monolayer (SAM) surface of 1-octadecanethiol (HS(CH2)17CH3) on gold. Low-rate dynamic advancing contact angles were measured for sessile drops in vapor-saturated air using Axisymmetric Drop Shape Analysis-Profile (ADSA-P). The experiments were performed using a minimum of eight separately prepared SAM surfaces for each liquid. Although a degree of scatter in the measured contact angles existed, the general trend observed for each run was that the contact angles decreased as the radius of the three-phase line for the sessile drop increased from approximately 1 to 5 mm. To obtain a better view of the overall trend, the contact angles from all of the individual runs for each liquid were averaged at corresponding radii. Subsequently, the averaged results from these experiments were interpreted using the modified Young equation. It was found that the drop size dependence of contact angles was due to a positive line tension. The line tension values are of the order of 1 µJ/m with a trend toward larger values for higher liquid surface tensions. Copyright 1998 Academic Press.