Quantifying Interactions Between Water and Surfaces

  • Abhijeet Patra
Chapter
First Online:
Part of the Springer Theses book series (Springer Theses)

Abstract

In this chapter, we deploy an atomic force microscopy-based approach to locally probe surface wettability. The maximum pull-off force as calculated from force spectroscopy shows a remarkable correlation with the macroscale 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 behavior. The adhesion and capillary 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 nano scale to the macroscopic contact angle are primarily arising from electrostatic-dipole-dipole interactions on the surface. 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.

Keywords

Contact Angle Capillary Force Water Contact Angle Adhesion Force Hydrophilic Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Abhijeet Patra
    • 1
  1. 1.NUS Graduate School for Integrative Sciences and EngineeringNUS Nanoscience and Nanotechnology InstituteSingaporeSingapore

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