Synthesis and Electrophoretic Concentration of Cadmium Sulfide Nanoparticles in Reverse Microemulsions of Tergitol NP-4 in n-Decane.

Title Synthesis and Electrophoretic Concentration of Cadmium Sulfide Nanoparticles in Reverse Microemulsions of Tergitol NP-4 in n-Decane.
Authors A.N. Kolodin; V.V. Tatarchuk; A.Ivanovich Bulavchenko; E.V. Poleeva
Journal Langmuir
DOI 10.1021/acs.langmuir.7b00690
Abstract

The kinetics of thiourea synthesis of CdS nanoparticles (NPs) in reverse microemulsions of Tergitol Np-4/n-decane was studied in the temperature range of 40-60°C by spectrophotometry, photon-correlation spectroscopy and transmission electron microscopy. The formation of NPs is described by the kinetic model including two consecutive steps: homogeneous nucleation in a solution as the first step, and autocatalytic growth of NPs due to heterogeneous reaction on a continuously increasing surface as the second step. Effective rate constants of the steps (k1 = 1.52×10(-2) - 1.75×10(-3) s(-1) and k2 = 4.9×10(-1) - 5.1×10(-2) M(-1)s(-1)) and effective activation energies (Ea1 = 156 and Ea2 = 149 kJ/mol) were estimated in the pseudofirst-order reaction with respect to cadmium (CCd = 0.9 mM, CThio = 9 mM). The obtained constants were used to calculate the dependence of nanoparticle diameter on the synthesis time (d(3) ~ t). The calculated values correlate well with experimental data of photon-correlation spectroscopy and transmission electron microscopy.

Citation A.N. Kolodin; V.V. Tatarchuk; A.Ivanovich Bulavchenko; E.V. Poleeva.Synthesis and Electrophoretic Concentration of Cadmium Sulfide Nanoparticles in Reverse Microemulsions of Tergitol NP-4 in n-Decane.. Langmuir. 2017. doi:10.1021/acs.langmuir.7b00690

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