Preparation and characterization of CdS and ZnS particles in nanophase reactors provided by binary liquids adsorbed at colloidal silica particles

I. Dékány, L. Nagy, L. Túri, Z. Király, N. A. Kotov, J. H. Fendler

Research output: Contribution to journalArticle

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Abstract

Determinations of adsorption excess isotherms of silica particle dispersions in ethanol-cyclohexane and in methanol-cyclohexane binary mixtures have established the formation of 0.5-5.0 nm thick alcohol rich adsorption layers at the silica particle interface. The adsorption layers on silica particles, formed in methanol-cyclohexane = 0.01:99.99 (mol/mol) and ethanol-cyclohexane = 0.05:99.95 (mol/mol), were used as nanophase reactors for the in situ generation of size-quantized CdS and ZnS particles. The semiconductor particles were generated by the addition of H2S to silica particle dispersions which contained different concentrations Of Cd2+ or Zn2+. The smallest semiconductor particles were generated in dispersions which contained the least amount of precursors. Absorption spectrophotometry, small-angle X-ray scattering, rheological, and calorimetric measurements were used to characterize the dispersions. The presence of semiconductor particles increased the viscosities and decreased the immersion wetting enthalpies of the silica dispersions, indicating strong interparticle interactions.

Original languageEnglish
Pages (from-to)3709-3715
Number of pages7
JournalLangmuir
Volume12
Issue number15
Publication statusPublished - Jul 24 1996

Fingerprint

Dispersions
Silicon Dioxide
Cyclohexane
Silica
reactors
silicon dioxide
preparation
Liquids
liquids
cyclohexane
Semiconductor materials
Methanol
Ethanol
Adsorption
adsorption
Spectrophotometry
Binary mixtures
X ray scattering
ethyl alcohol
Adsorption isotherms

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Preparation and characterization of CdS and ZnS particles in nanophase reactors provided by binary liquids adsorbed at colloidal silica particles. / Dékány, I.; Nagy, L.; Túri, L.; Király, Z.; Kotov, N. A.; Fendler, J. H.

In: Langmuir, Vol. 12, No. 15, 24.07.1996, p. 3709-3715.

Research output: Contribution to journalArticle

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