TY - JOUR
T1 - Anti-Icing or Deicing
T2 - Icephobicities of Superhydrophobic Surfaces with Hierarchical Structures
AU - Sarshar, Mohammad Amin
AU - Song, Dong
AU - Swarctz, Christopher
AU - Lee, Jongsuk
AU - Choi, Chang Hwan
N1 - Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/11/20
Y1 - 2018/11/20
N2 - Superhydrophobic surfaces have gained tremendous attention for icephobic properties, including anti-icing and deicing. The former is about how much a surface can delay the ice formation, whereas the latter is about how easy the surface can let the ice go off after freezing. In this study, superhydrophobic surfaces with different surface roughnesses and wettabilities were tested for both anti-icing and deicing purposes to investigate their correlation in association with the different surface properties. Anti-icing test was conducted by utilizing an icing wind tunnel to see how much ice gets accumulated on the surfaces in a dynamic condition (i.e., impacting supercooled water droplets by forced wind). For the deicing test, sessile droplets were frozen on the surfaces in a static condition (i.e., no wind) and then the shear adhesion forces were measured to disconnect the frozen ices off from the surfaces. The experimental results show that higher anti-icing efficacy does not necessarily mean higher deicing efficacy because of the different icing mechanisms. Although a superhydrophobic surface with a lower depinning force (or contact angle hysteresis) delays the ice accumulation in a dynamic condition more effectively, the same surface can require higher shear adhesion force for ice grown in a static condition where condensation and wetting state of a droplet are the key factors.
AB - Superhydrophobic surfaces have gained tremendous attention for icephobic properties, including anti-icing and deicing. The former is about how much a surface can delay the ice formation, whereas the latter is about how easy the surface can let the ice go off after freezing. In this study, superhydrophobic surfaces with different surface roughnesses and wettabilities were tested for both anti-icing and deicing purposes to investigate their correlation in association with the different surface properties. Anti-icing test was conducted by utilizing an icing wind tunnel to see how much ice gets accumulated on the surfaces in a dynamic condition (i.e., impacting supercooled water droplets by forced wind). For the deicing test, sessile droplets were frozen on the surfaces in a static condition (i.e., no wind) and then the shear adhesion forces were measured to disconnect the frozen ices off from the surfaces. The experimental results show that higher anti-icing efficacy does not necessarily mean higher deicing efficacy because of the different icing mechanisms. Although a superhydrophobic surface with a lower depinning force (or contact angle hysteresis) delays the ice accumulation in a dynamic condition more effectively, the same surface can require higher shear adhesion force for ice grown in a static condition where condensation and wetting state of a droplet are the key factors.
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U2 - 10.1021/acs.langmuir.8b02231
DO - 10.1021/acs.langmuir.8b02231
M3 - Article
C2 - 30360623
AN - SCOPUS:85056466467
SN - 0743-7463
VL - 34
SP - 13821
EP - 13827
JO - Langmuir
JF - Langmuir
IS - 46
ER -