Bliznyuk O, Vereshchagina E, Kooij E Stefan, Poelsema Bene
Solid State Physics, IMPACT, University of Twente, P.O. Box 217, NL-7500AE Enschede, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Apr;79(4 Pt 1):041601. doi: 10.1103/PhysRevE.79.041601. Epub 2009 Apr 3.
We present an experimental study of the tunable anisotropic wetting behavior of chemically patterned anisotropic surfaces. Asymmetric glycerol droplet shapes, arising from patterns of alternating hydrophilic (pristine SiO2) and hydrophobic (fluoroalkylsilane self-assembled monolayers) stripes with dimensions in the low-micrometer range, are investigated in relation to stripe widths. Owing to the well-defined small droplet volume, the equilibrium shape as well as the observed contact angles exhibit unique scaling behavior. Only the relative width of hydrophilic and hydrophobic stripes proves to be a relevant parameter. Our results on morphologically flat, chemically patterned surfaces show similarities with those of experiments on topographically corrugated substrates. They are discussed in terms of the energetics at the liquid-solid interface.
我们展示了一项关于化学图案化各向异性表面的可调谐各向异性润湿行为的实验研究。研究了由尺寸在低微米范围内的交替亲水（原始二氧化硅）和疏水（氟代烷基硅烷自组装单分子层）条纹图案产生的不对称甘油液滴形状与条纹宽度的关系。由于液滴体积明确且小，平衡形状以及观察到的接触角呈现出独特的标度行为。结果表明，只有亲水和疏水条纹的相对宽度才是一个相关参数。我们在形态学上平坦、化学图案化表面上的研究结果与在地形上有波纹的基底上进行的实验结果相似。从液 - 固界面的能量学角度对这些结果进行了讨论。
