Adsorption on hydrophobized surfaces: Clusters and self-organization

Gerhard Lagaly, I. Dékány

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The arrangement of liquid molecules on surfaces bristling with alkyl chains is deduced from adsorption studies, X-ray powder diffraction data, and microcalorimetric measurements of swelling-type layered materials, especially clay minerals. Small polar molecules such as water, ethanol, formamide, dimethylsulfoxide, and aromatic compounds are clustered between the alkyl chains pointing away from the surface. The energetic contribution related to the movement of the alkyl chains from direct contact with the surface atoms into upright positions is decisive. The importance of the interactions between the liquid molecules on the structure of the adsorption layer is clearly indicated by the changes of the adsorption layer thickness by salt addition. Thermodynamic data are obtained from surface excess adsorption isotherms from binary liquid mixtures combined with microcalorimetric measurements. Long-chain adsorptives such as long-chain alcohols interact with the surface alkyl chains by forming stable bimolecular films. These films undergo a series of higher-order phase transitions into kink- and gauche-block structures as the consequence of rotational isomerization of the alkyl chains. Such transitions are considered elementary processes in self-assembling films (layer-by-layer deposition, fuzzy films, Langmuir-Blodgett technique), and lipid membranes.

Original languageEnglish
Pages (from-to)189-204
Number of pages16
JournalAdvances in Colloid and Interface Science
Volume114-115
DOIs
Publication statusPublished - Jun 30 2005

Fingerprint

Adsorption
adsorption
Molecules
Liquids
liquids
molecules
aromatic compounds
Aromatic compounds
Langmuir Blodgett films
Membrane Lipids
Langmuir-Blodgett films
Isomerization
Dimethyl Sulfoxide
assembling
Clay minerals
Adsorption isotherms
swelling
X ray powder diffraction
isomerization
clays

Keywords

  • Adsorption
  • Clay minerals
  • Hydrophobization
  • Kinks
  • Layered compounds
  • Self-assembling

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Adsorption on hydrophobized surfaces : Clusters and self-organization. / Lagaly, Gerhard; Dékány, I.

In: Advances in Colloid and Interface Science, Vol. 114-115, 30.06.2005, p. 189-204.

Research output: Contribution to journalArticle

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