Classical density functional study of wetting transitions on nanopatterned surfaces Articles uri icon

publication date

  • January 2017

start page

  • 1

end page

  • 8

issue

  • 9 (094001)

volume

  • 29

International Standard Serial Number (ISSN)

  • 0953-8984

Electronic International Standard Serial Number (EISSN)

  • 1361-648X

abstract

  • Even simple fluids on simple substrates can exhibit very rich surface phase behaviour. To illustrate this, we consider fluid adsorption on a planar wall chemically patterned with a deep stripe of a different material. In this system, two phase transitions compete: unbending and pre-wetting. Using microscopic density-functional theory, we show that, for thin stripes, the lines of these two phase transitions may merge, leading to a new two-dimensional-like wetting transition occurring along the walls. The influence of intermolecular forces and interfacial fluctuations on this phase transition and at complete pre-wetting are considered in detail.

keywords

  • classical density functional theory; wetting; phase transitions; nanopatterned surfaces