Non-DLVO silica interaction forces in NMP-water mixtures. II. An asymmetric system

Jung-hyun Lee, J. Carson Meredith

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The interaction between energetically asymmetric hydrophilic and hydrophobic surfaces has fundamental and practical importance in both industrial and natural colloidal systems. The interaction forces between a hydrophilic silica sphere and a silanated, hydrophobic glass plate in N-methyl-2-pyrrolidone (NMP)-water binary mixtures were measured using atomic force microscopy (AFM). A strong and long-range attractive force was observed in pure water and was attributed to the formation of capillary bridges associated with nanoscale bubbles initially present on the hydrophobic surface. When NMP was added, the capillary force and corresponding pull-off force became less attractive, which was explained readily in terms of the surface wettability by the binary solvent mixture. Similar to the case of symmetric (two hydrophilic) surfaces, the range of attraction between the asymmetric surfaces was maximized at around 30 vol % NMP, which is consistent with the formation of a thick adsorbed macrocluster layer on the hydrophilic silica surface.

Original languageEnglish
Pages (from-to)10000-10006
Number of pages7
JournalLangmuir
Volume27
Issue number16
DOIs
Publication statusPublished - 2011 Aug 16
Externally publishedYes

Fingerprint

Silicon Dioxide
Silica
silicon dioxide
Water
water
Wettability
Atomic Force Microscopy
interactions
Glass
Binary mixtures
wettability
binary mixtures
attraction
Wetting
N-methylpyrrolidone
Atomic force microscopy
bubbles
atomic force microscopy
glass

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Non-DLVO silica interaction forces in NMP-water mixtures. II. An asymmetric system. / Lee, Jung-hyun; Meredith, J. Carson.

In: Langmuir, Vol. 27, No. 16, 16.08.2011, p. 10000-10006.

Research output: Contribution to journalArticle

Lee, Jung-hyun ; Meredith, J. Carson. / Non-DLVO silica interaction forces in NMP-water mixtures. II. An asymmetric system. In: Langmuir. 2011 ; Vol. 27, No. 16. pp. 10000-10006.
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