TY - JOUR
T1 - Correlation of nanoscale behaviour of forces and macroscale surface wettability
AU - Rana, Abhimanyu
AU - Patra, Abhijeet
AU - Annamalai, Meenakshi
AU - Srivastava, Amar
AU - Ghosh, Siddhartha
AU - Stoerzinger, Kelsey
AU - Lee, Yueh Lin
AU - Prakash, Saurav
AU - Jueyuan, Reuben Yeo
AU - Goohpattader, Partho S.
AU - Satyanarayana, Nalam
AU - Gopinadhan, Kalon
AU - Dykas, Michal M.
AU - Poddar, Kingshuk
AU - Saha, Surajit
AU - Sarkar, Tarapada
AU - Kumar, Brijesh
AU - Bhatia, Charanjit S.
AU - Giordano, Livia
AU - Yang, Shao Horn
AU - Venkatesan, T.
N1 - Publisher Copyright:
© 2016 The Royal Society of Chemistry.
PY - 2016/9/14
Y1 - 2016/9/14
N2 - In this manuscript, we demonstrate a method based on atomic force microscopy which enables local probing of surface wettability. The maximum pull-off force, obtained from force spectroscopy shows a remarkable correlation with the macroscopically observed water contact angle, measured over a wide variety of surfaces starting from hydrophilic, all the way through to hydrophobic ones. This relationship, consequently, facilitates the establishment of a universal behaviour. The adhesion forces scale with the polar component of surface energy. However, no such relation could be established with the dispersive component. Hence, we postulate that the force(s) which enable us to correlate the force spectroscopy data measured on the nanoscale to the macroscopic contact angle are primarily arising from electrostatic-dipole-dipole interactions at the solid-liquid interface. London forces play less of a role. This effect in is line with density functional theory (DFT) calculations suggesting a higher degree of hydroxylation of hydrophilic surfaces. This result shows that molecular simulations and measurements on an atomic scale can be extrapolated to macroscopic surface wetting problems.
AB - In this manuscript, we demonstrate a method based on atomic force microscopy which enables local probing of surface wettability. The maximum pull-off force, obtained from force spectroscopy shows a remarkable correlation with the macroscopically observed water contact angle, measured over a wide variety of surfaces starting from hydrophilic, all the way through to hydrophobic ones. This relationship, consequently, facilitates the establishment of a universal behaviour. The adhesion forces scale with the polar component of surface energy. However, no such relation could be established with the dispersive component. Hence, we postulate that the force(s) which enable us to correlate the force spectroscopy data measured on the nanoscale to the macroscopic contact angle are primarily arising from electrostatic-dipole-dipole interactions at the solid-liquid interface. London forces play less of a role. This effect in is line with density functional theory (DFT) calculations suggesting a higher degree of hydroxylation of hydrophilic surfaces. This result shows that molecular simulations and measurements on an atomic scale can be extrapolated to macroscopic surface wetting problems.
UR - http://www.scopus.com/inward/record.url?scp=84984633825&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84984633825&partnerID=8YFLogxK
U2 - 10.1039/c6nr02076c
DO - 10.1039/c6nr02076c
M3 - Article
AN - SCOPUS:84984633825
SN - 2040-3364
VL - 8
SP - 15597
EP - 15603
JO - Nanoscale
JF - Nanoscale
IS - 34
ER -