Obtaining electrostatically bound CdS - SiO2 aggregates from electrophoretic concentrates of CdS nanoparticles

A. I. Bulavchenko, A. A. Sap'yanik, M. G. Demidova, M. I. Rakhmanova, P. S. Popovetskii

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Nonaqueous electrophoresis reveals that the electrokinetic potential of CdS nanoparticles increases slightly (85 - 120 mV) along with the concentration (0-5 × 10-3 M) of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in n-decane, while negatively charged SiO2 particles acquire positive charge (switching from -75 up to +135 mV). The energies of interparticle interactions in CdS - CdS and CdS - SiO2 systems are calculated from these parameters and the literature values of the Hamaker constants according to the Deryaguin - Landau - Verwey - Overbeek (DLVO) theory. It is concluded that the presence of a minimum (2.5 kBT) on the potential dependences of the CdS-SiO2 system indicates the formation of CdS-SiO2 aggregates electrostatically bound by heterocoagulation at low concentrations of AOT. The luminescent properties of the obtained ultrafine CdS-SiO2 powders depend on the CdS content.

Original languageEnglish
Pages (from-to)828-834
Number of pages7
JournalRussian Journal of Physical Chemistry A
Volume89
Issue number5
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • cadmium sulfide
  • DLVO theory
  • electrophoretic concentration
  • heterocoagulation
  • luminescence
  • nanoparticles

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