Advancing and receding angles – Dynamic contact angle measurements on mixed alkyl monolayers

Advancing and receding angles – Dynamic contact angle measurements on mixed alkyl monolayers
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前进角和后退角 â 混合烷基单层的动态接触角测量

DOI:
10.1016/j.apsusc.2012.10.128
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发表时间:
2013
影响因子:
6.7
通讯作者:
H. Graaf
H. Graaf
中科院分区:
材料科学1区
文献类型:
--
作者:
D. Polster;H. Graaf

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采用不同摩尔分数的1-癸烯和10-十一烯酸甲酯的混合物在硅(100)表面制备了混合单分子膜。使用动态座滴法对两种不同液体的动态接触角测量来表征所形成的层。前进和后退接触角以及计算的摩尔润湿自由能随10-十一烯酸甲酯摩尔分数的增加而减小。除此之外,摩尔去湿自由能以及接触角滞后几乎保持恒定。观察到的混合单分子膜的润湿和去湿性能的差异,其中主要是分散的相互作用是负责润湿。此外,我们表明,接触角滞后是独立的表面粗糙度,表面组成和表面自由能,这表明,既不是表面粗糙度,也不是不均匀性负责这种滞后。我们把滞后现象归因于液体和硅衬底之间的相互作用。
Mixtures of 1-decene and methyl-10-undecenoate with different mole fractions were used to prepared mixed monolayers on silicon (100) surfaces. The formed layers were characterized by dynamic contact angle measurements of two different liquids using the dynamic sessile drop method. The advancing and receding contact angles as well the calculated molar wetting free energies decreased with increasing mole fraction of methyl-10-undecenoate. Otherwise the molar dewetting free energies as well as the contact angle hysteresis stay nearly constant. A difference in the wetting and dewetting properties on mixed monolayers is observed, whereby mainly dispersive interactions are responsible for wetting. Furthermore we show that the contact angle hysteresis is independent of surface roughness, surface composition and surface free energy, which indicates that neither surface roughness nor heterogeneities are responsible for this hysteresis. We attribute the hysteresis to interactions between the liquid and the silicon substrate.
DOI: 10.1021/la960467g
发表时间: 1997
期刊: Langmuir
影响因子: 3.9
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