Direct measurements of interaction forces between amine-modified glass surfaces using atomic forces microscope

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Abstract

Interaction forces between amine-modified glass surfaces in aqueous solution were measured using atomic force microscope (AFM). The surface charge of the amine-modified glass was regulated by varying the pH. It has positive and negative sign at pHs' below and above the isoelectric point (pI), respectively, where the electrical double-layer repulsion was observed. The pH value where the apparent surface charge disappeared, pI, shifts within the range 6-9, depending on the surface coverage by the amine group. At the isoelectric point, the long-range attraction being several or ten times greater than the conventional van der Waals attraction appeared at the expense of the double-layer repulsion. The amine-modified surfaces, exhibited relatively low hydrophobicity, the contact angle of water was 32 ± 7°. The origin of long-range attraction was discussed based on the data taken at various salt concentrations and temperatures.

Original languageEnglish
Pages (from-to)266-269
Number of pages4
JournalProgress in Colloid and Polymer Science
Volume106
DOIs
Publication statusPublished - 1997 Jan 1
Externally publishedYes

Keywords

  • Amine-modified surface
  • Atomic force microscope
  • Isoelectric point
  • Long-range attraction
  • Surface force

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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