TY - JOUR
T1 - Dynamic wetting
T2 - Hydrodynamic or molecular-kinetic?
AU - Ranabothu, Srinivas R.
AU - Karnezis, Cassandra
AU - Dai, Lenore L.
N1 - Funding Information:
We are indebted to Professors M. Vaughn and S. Simon for their invaluable discussion. In addition, we are grateful to Professors P. O'Connell and G.B. McKenna for AFM analysis. The external financial support was provided by the 3M Non-tenured Faculty Award (2003 and 2004). We also acknowledge the partial support of the Texas Tech Honors College Undergraduate Research Fellowship for C. Karnezis.
PY - 2005/8/1
Y1 - 2005/8/1
N2 - The dynamic wetting behavior of simple liquids (water, glycerin, formamide, ethylene glycol, and a mixture of water and ethylene glycol) and polydimethylsiloxane (PDMS) oils with different viscosities has been investigated. The hydrodynamic, molecular-kinetic, and combined molecular-hydrodynamic models have been applied to the experimental results to evaluate the models' adequacy. Our work suggests that the molecular displacement, i.e., the adsorption and desorption process, seems to be dominant for the simple liquids investigated. For polydimethylsiloxanes, our work suggests that none of the evaluated models is sufficient to explain the experimentally observed dependence of the dynamic contact angle on contact velocity. This work, to the best of our knowledge, provides the first extensive comparison of the three models with experimental data over a wide range of viscosity. In addition, we have investigated the contact angle hysteresis and conclude that it is a strong function of the contact speed, the interactions between the fluids and the substrate, and the fluid viscosity.
AB - The dynamic wetting behavior of simple liquids (water, glycerin, formamide, ethylene glycol, and a mixture of water and ethylene glycol) and polydimethylsiloxane (PDMS) oils with different viscosities has been investigated. The hydrodynamic, molecular-kinetic, and combined molecular-hydrodynamic models have been applied to the experimental results to evaluate the models' adequacy. Our work suggests that the molecular displacement, i.e., the adsorption and desorption process, seems to be dominant for the simple liquids investigated. For polydimethylsiloxanes, our work suggests that none of the evaluated models is sufficient to explain the experimentally observed dependence of the dynamic contact angle on contact velocity. This work, to the best of our knowledge, provides the first extensive comparison of the three models with experimental data over a wide range of viscosity. In addition, we have investigated the contact angle hysteresis and conclude that it is a strong function of the contact speed, the interactions between the fluids and the substrate, and the fluid viscosity.
KW - Combined model
KW - Contact angle hysteresis
KW - Contact angles
KW - Dynamic wetting
KW - Hydrodynamic model
KW - Molecular-kinetic model
UR - http://www.scopus.com/inward/record.url?scp=20344377955&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=20344377955&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2005.02.074
DO - 10.1016/j.jcis.2005.02.074
M3 - Article
C2 - 15927582
AN - SCOPUS:20344377955
SN - 0021-9797
VL - 288
SP - 213
EP - 221
JO - Journal of Colloid And Interface Science
JF - Journal of Colloid And Interface Science
IS - 1
ER -