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 k B T) 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.
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Original Russian Text © A.I. Bulavchenko, A.A. Sap’yanik, M.G. Demidova, M.I. Rakhmanova, P.S. Popovetskii, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 5, pp. 812–818.
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Bulavchenko, A.I., Sap’yanik, A.A., Demidova, M.G. et al. Obtaining electrostatically bound CdS-SiO2 aggregates from electrophoretic concentrates of CdS nanoparticles. Russ. J. Phys. Chem. 89, 828–834 (2015). https://doi.org/10.1134/S0036024415050106
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DOI: https://doi.org/10.1134/S0036024415050106