TY - JOUR
T1 - Wetting of flat gradient surfaces
AU - Bormashenko, Edward
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/4/1
Y1 - 2018/4/1
N2 - Gradient, chemically modified, flat surfaces enable directed transport of droplets. Calculation of apparent contact angles inherent for gradient surfaces is challenging even for atomically flat ones. Wetting of gradient, flat solid surfaces is treated within the variational approach, under which the contact line is free to move along the substrate. Transversality conditions of the variational problem give rise to the generalized Young equation valid for gradient solid surfaces. The apparent (equilibrium) contact angle of a droplet, placed on a gradient surface depends on the radius of the contact line and the values of derivatives of interfacial tensions. The linear approximation of the problem is considered. It is demonstrated that the contact angle hysteresis is inevitable on gradient surfaces. Electrowetting of gradient surfaces is discussed.
AB - Gradient, chemically modified, flat surfaces enable directed transport of droplets. Calculation of apparent contact angles inherent for gradient surfaces is challenging even for atomically flat ones. Wetting of gradient, flat solid surfaces is treated within the variational approach, under which the contact line is free to move along the substrate. Transversality conditions of the variational problem give rise to the generalized Young equation valid for gradient solid surfaces. The apparent (equilibrium) contact angle of a droplet, placed on a gradient surface depends on the radius of the contact line and the values of derivatives of interfacial tensions. The linear approximation of the problem is considered. It is demonstrated that the contact angle hysteresis is inevitable on gradient surfaces. Electrowetting of gradient surfaces is discussed.
KW - Contact angle hysteresis
KW - Gradient surfaces
KW - Transversality conditions
KW - Wetting
UR - http://www.scopus.com/inward/record.url?scp=85042376303&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2018.01.043
DO - 10.1016/j.jcis.2018.01.043
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C2 - 29348044
AN - SCOPUS:85042376303
SN - 0021-9797
VL - 515
SP - 264
EP - 267
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -