Publication detail

Density Depletion at Solid-Liquid Interfaces: a Neutron Reflectivity Study

Maccarini, M, Steitz, R., Himmelmaus, F., Fick, M., Tatur, S., Wolff, M., Grunze, M., Janeček, J., Netz, R.R.

Original Title

Density Depletion at Solid-Liquid Interfaces: a Neutron Reflectivity Study

Type

journal article - other

Language

English

Original Abstract

Neutron reflectivity experiments conducted on self-assembled monolayers (SAMs) against polar (water) and nonpolar (organic) liquid phases reveal further evidence for a density reduction at hydrophobic-hydrophilic interfaces. The density depletion is found at the interface between hydrophobic dodecanethiol (C12) and hexadecanethiol (C16) SAMs and water and also between hydrophilic SAMs (C12/C11OH) and nonpolar fluids. The results show that the density deficit of a fluid in the boundary layer is not unique to aqueous solid-liquid interfaces but is more general and correlated with the affinity of the liquid to the solid surface. In water the variation of pH has only minor influence, while different electrolytes taken from the Hofmeister series seem to increase the depletion. On hydrophobic SAMs an increase in density depletion with temperature was observed, in agreement with Monte Carlo simulations performed on corresponding model systems. The increase in the water density depletion layer is governed by two effects: the surface energy difference between water and the substrate and the chemical potential of the aqueous phase.

Keywords

SELF-ASSEMBLED MONOLAYERS; UNITED-ATOM DESCRIPTION; SURFACE FREE-ENERGY; HYDROPHOBIC SURFACES; WATER-STRUCTURE; TRANSFERABLE POTENTIALS; ACTIVITY-COEFFICIENTS; COMPUTER-SIMULATION; PHASE-EQUILIBRIA; MONTE-CARLO

Authors

Maccarini, M, Steitz, R., Himmelmaus, F., Fick, M., Tatur, S., Wolff, M., Grunze, M., Janeček, J., Netz, R.R.

RIV year

2007

Released

16. 1. 2007

Publisher

ACS

Location

Washington DC USA

ISBN

0743-7463

Periodical

Langmuir

Year of study

23

Number

2

State

United States of America

Pages from

598

Pages to

608

Pages count

11

BibTex

@article{BUT44263,
  author="Jiří {Janeček}",
  title="Density Depletion at Solid-Liquid Interfaces: a Neutron Reflectivity Study",
  journal="Langmuir",
  year="2007",
  volume="23",
  number="2",
  pages="598--608",
  issn="0743-7463"
}