Kim, J. H. and Kavehpour, H. P. and Rothstein, J. P.. (2015) Dynamic contact angle measurements on superhydrophobic surfaces. Physics of Fluids, 27 (3).Full text not available from this repository.
In this paper, the dynamic advancing and receding contact angles of a series of aqueous solutions were measured on a number of hydrophobic and superhydrophobic surfaces using a modified Wilhelmy plate technique. Superhydrophobic surfaces are hydrophobic surfaces with micron or nanometer sized surface roughness. These surfaces have very large static advancing contact angles and little static contact angle hysteresis. In this study, the dynamic advancing and dynamic receding contact angles on superhydrophobic surfaces were measured as a function of plate velocity and capillary number. The dynamic contact angles measured on a smooth hydrophobic Teflon surface were found to obey the scaling with capillary number predicted by the Cox-Voinov-Tanner law, theta(3)(D) proportional to Ca. The response of the dynamic contact angle on the superhydrophobic surfaces, however, did not follow the same scaling law. The advancing contact angle was found to remain constant at theta(A) = 160 degrees, independent of capillary number. The dynamic receding contact angle measurements on superhydrophobic surfaces were found to decrease with increasing capillary number; however, the presence of slip on the superhydrophobic surface was found to result in a shift in the onset of dynamic contact angle variation to larger capillary numbers. In addition, a much weaker dependence of the dynamic contact angle on capillary number was observed for some of the superhydrophobic surfaces tested. (C) 2015 AIP Publishing LLC.
|Additional Information:||ISI Document Delivery No.: CF1MHTimes Cited: 0Cited Reference Count: 47Kim, Jeong-Hyun Kavehpour, H. Pirouz Rothstein, Jonathan P.Center for Hierarchical Manufacturing at University of Massachusetts Amherst under NSF CMMI-1025020, CBET-1334962This research was supported by the Center for Hierarchical Manufacturing at University of Massachusetts Amherst under NSF Grant Nos. CMMI-1025020 and CBET-1334962.Amer inst physicsMelville|
|Collections:||Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing|
|Depositing User:||Robert Stevens|
|Date Deposited:||12 Nov 2015 18:38|
|Last Modified:||12 Nov 2015 18:38|
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