TY - JOUR
T1 - Experimental study of dynamic contact angles on rough hydrophobic surfaces
AU - Mohammad Karim, Alireza
AU - Rothstein, Jonathan P.
AU - Kavehpour, H. Pirouz
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - Rough hydrophobic surfaces have many applications in industry and technology. An experimental study was done on the spreading dynamics of different concentrations of polyethylene glycol (PEG) solutions on rough Teflon plates with different roughness. The experiments were conducted using Wilhelmy plate method. The advancing dynamic contact angle was found to be weakly dependent of capillary number. However, the receding dynamic contact angle decreases with increasing capillary number. The degree of roughness on rough Teflon surface has an important role on dynamic contact angle. The dynamics of receding motion was found to follow the molecular-kinetic theory. A power law relation between the receding dynamic contact angle and the capillary number was also obtained.
AB - Rough hydrophobic surfaces have many applications in industry and technology. An experimental study was done on the spreading dynamics of different concentrations of polyethylene glycol (PEG) solutions on rough Teflon plates with different roughness. The experiments were conducted using Wilhelmy plate method. The advancing dynamic contact angle was found to be weakly dependent of capillary number. However, the receding dynamic contact angle decreases with increasing capillary number. The degree of roughness on rough Teflon surface has an important role on dynamic contact angle. The dynamics of receding motion was found to follow the molecular-kinetic theory. A power law relation between the receding dynamic contact angle and the capillary number was also obtained.
KW - Contact line velocity
KW - Dynamic contact angle
KW - Molecular-kinetic theory
KW - Rough Teflon plate
KW - Wilhelmy plate method
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U2 - 10.1016/j.jcis.2017.11.075
DO - 10.1016/j.jcis.2017.11.075
M3 - Article
C2 - 29207348
AN - SCOPUS:85036465020
SN - 0021-9797
VL - 513
SP - 658
EP - 665
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
ER -