Study of two-component colloidal particles at air/water interfaces using Langmuir-Blodgett techniques

Huan Ma, Brian Perea, Lenore Dai

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

One and two-component colloidal particles, sulfate-treated polystyrene (S-PS), aldehyde-sulfate (AS-PS), and carboxylate-treated polystyrene particles (C-PS), were assembled at air/water interfaces by injecting particle dispersions. Surface pressure-area (π-A) isotherms were measured using the Langmuir-Blodgett technique. The isotherms for S-PS particles are reversible and independent of barrier speeds during the compression/relaxation cycles. The normalized isotherms of S-PS/AS-PS and S-PS/C-PS particle mixtures lie between those of single species. In addition, the self-assembled structures of particles were transferred onto mica substrates and characterized using a laser scanning confocal microscope. The morphology of the two-component layer has the characteristics of both single component layers with no significant phase separation. Finally, we have explored the potential applicability of a purely additive group contribution analysis to surface pressure-area isotherms.

Original languageEnglish (US)
Pages (from-to)61-65
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume372
Issue number1-3
DOIs
Publication statusPublished - Dec 3 2010

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Keywords

  • Air/water interfaces
  • Langmuir-Blodgett techniques
  • Two-component colloidal particles

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

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