Colloidal Interactions—DLVO Theory and Beyond

Zita Zachariah, Manfred P. Heuberger, Rosa M. Espinosa-Marzal

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The long-range approximation of the DLVO theory fails to predict the surface forces at distances below the Debye length or in highly concentrated electrolytes. Previous studies have revealed the contribution of non-DLVO hydration and structural forces to the overall interaction. However, the physical behaviour of charged sufaces separated by near molecular distances in solution is not well understood yet. In order to further explore structural details of the electrostatic double layer, the accuracy of the extended Surface Force Apparatus was used to directly measure the surface forces between two atomically flat mica surfaces in monovalent nitrate solutions. This chapter summarizes the discovered fine structure in highly confined double layers. The precise quantification of structural components allows classification of previously reported oscillatory non-DLVO surface forces into distinct structural or dehydration transitions involving different ion species and a wide range of concentrations.

Original languageEnglish (US)
Title of host publicationACS Symposium Series
EditorsRamanathan Nagarajan
PublisherAmerican Chemical Society
Pages31-47
Number of pages17
DOIs
StatePublished - Nov 30 2023
Externally publishedYes

Publication series

NameACS Symposium Series
Volume1457
ISSN (Print)0097-6156
ISSN (Electronic)1947-5918

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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