Solvation force between surfaces modified by tethered chains: A density functional approach

Orest Pizio, L. Pusztai, Zofia Sokołowska, Stefan Sokołowski

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The behavior of Lennard-Jones fluid in slitlike pores with walls modified by tethered chain molecules is studied using density functional theory. The effects of confinement and chemical modification of pore walls on the solvation force are investigated. Two models of the pore walls are considered. According to the first model, the chain molecules are chemically bonded by their end segments to opposite walls of the pore, forming flexible pillars. In the second model the chains build up a brush at each wall due to bonding of the first segment at one wall. The nonbonded terminating segment of a molecule is strongly attracted via a short-range potential to any wall of the pore. Then a pillarlike or looplike structure of chains can be formed. In the first model the solvation force at the wall-to-wall is repulsive for narrow pores and strongly attractive for wider pores of the order of the nominal chain length. Oscillations of the solvation force are induced by adsorbed fluid structure and by ordered structure of segments on the fragment of entirely attractive force curve. In the second model, however, the solvation force decays to zero as the pore width increases. Attractive force can be induced at intermediate separation between walls due to modification of the pore walls.

Original languageEnglish
Article number134501
JournalThe Journal of Chemical Physics
Volume130
Issue number13
DOIs
Publication statusPublished - 2009

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Solvation
solvation
porosity
Molecules
Fluids
Chemical modification
Brushes
Chain length
Density functional theory
molecules
fluids
brushes
stopping
fragments
density functional theory
oscillations

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Solvation force between surfaces modified by tethered chains : A density functional approach. / Pizio, Orest; Pusztai, L.; Sokołowska, Zofia; Sokołowski, Stefan.

In: The Journal of Chemical Physics, Vol. 130, No. 13, 134501, 2009.

Research output: Contribution to journalArticle

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