Anomalous interfacial architecture in laponite aqueous suspensions on a gold surface

M. Manilo, P. Boltovets, B. Snopok, S. Barany, N. Lebovka

Research output: Contribution to journalReview article

3 Citations (Scopus)

Abstract

A technique of the surface plasmon resonance was used to test self-organization in aqueous suspensions of laponite platelets near the gold surface. The laponite concentrations in water covered the range C = 1–4 wt%. The kinetics of electrophoretic mobility changes during aging of laponite suspensions was also measured. Formation of equilibrium structure follows the stretched exponential model with the same one-half index (β ≈ 0.50) for all laponite concentrations. The changes in an effective refractive index, Δne, at the Au/aqueous laponite interface were estimated. The data evidenced about possibility of formation of depleted aqueous laponite architecture with anomalously small effective value of refractive index. Such anomaly can reflect the repelling of hydrated laponite platelets from the gold surface.

Original languageEnglish
Pages (from-to)883-891
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume520
DOIs
Publication statusPublished - May 5 2017

Keywords

  • Aqueous suspension
  • Laponite
  • Refractive index
  • Surface plasmon resonance
  • Zeta potential

ASJC Scopus subject areas

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

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