Direct and accurate measurement of size dependent wetting behaviors for sessile water droplets

Title
Direct and accurate measurement of size dependent wetting behaviors for sessile water droplets
Authors
박지민한형섭김유찬안재평옥명렬이경은이지욱차필령석현광전호정
Keywords
sessile water droplet; cryo FIB/SEM
Issue Date
2015-12
Publisher
Scientific Reports
Abstract
The size-dependent wettability of sessile water droplets is an important matter in wetting science. Although extensive studies have explored this problem, it has been difficult to obtain empirical data for microscale sessile droplets at a wide range of diameters because of the flaws resulting from evaporation and insufficient imaging resolution. Herein, we present the size-dependent quantitative change of wettability by directly visualizing the three phase interfaces of droplets using a cryogenic-focused ion beam milling and SEM-imaging technique. With the fundamental understanding of the formation pathway, evaporation, freezing, and contact angle hysteresis for sessile droplets, microdroplets with diameters spanning more than three orders of magnitude on various metal substrates were examined. Wetting nature can gradually change from hydrophobic at the hundreds-of-microns scale to super-hydrophobic at the sub-mu m scale, and a nonlinear relationship between the cosine of the contact angle and contact line curvature in microscale water droplets was demonstrated. We also showed that the wettability could be further tuned in a size-dependent manner by introducing regular heterogeneities to the substrate.
URI
http://pubs.kist.re.kr/handle/201004/58353
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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