. "000304432400009" . "Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide" . "Molecular modeling; Cetyltrimethylammonium bromide; ZnS nanoparticles"@en . . "RIV/00216208:11320/12:10128555" . "P(ED0040/01/01), P(GAP107/11/1918), Z(MSM0021620835)" . "http://dx.doi.org/10.1016/j.jcis.2012.03.073" . "377" . "0021-9797" . "Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide"@en . "Praus, Petr" . . "Kov\u00E1\u0159, Petr" . "10.1016/j.jcis.2012.03.073" . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "6"^^ . . "[BFE2B7DC94C9]" . . . "ZnS nanoparticles were precipitated in aqueous dispersions of cationic surfactant cetyltrimethylammonium bromide (CTAB). The sphere radii of ZnS nanoparticles calculated by using band-gap energies steeply decreased from 4.5 nm to 2.2 nm within CTAB concentrations of 0.4-1.5 mmol L-1. Above the concentration of 1.5 mmol L-1, the radii were stabilized at R = 2.0 nm and increased up to R = 2.5 nm after 24 h. The hydrodynamic diameters of ZnS-CTAB structures observed by the dynamic light scattering (DLS) method ranged from 130 nm to 23 nm depending on CTAB concentrations of 0.5-1.5 mmol L-1. The complex structures were observed by scanning electron microscopy (SEM). At the higher CTAB concentrations, ZnS nanoparticles were surrounded by CTA(+) bilayers forming positively charged micelles with the diameter of 10 nm. The positive zeta-potentials of the micelles and their agglomerates were from 16 mV to 33 mV. Wurtzite and sphalerite nanoparticles with R = 2.0 nm and 2.5 nm covered by CTA(+). were modeled with and without water. Calculated sublimation energies confirmed that a bilayer arrangement of CFA(+) on the ZnS nanoparticles was preferred to a monolayer."@en . . . . . "JUL 1 2012" . . "Horinkova, Petra" . "Dvorsky, Richard" . "ZnS nanoparticles were precipitated in aqueous dispersions of cationic surfactant cetyltrimethylammonium bromide (CTAB). The sphere radii of ZnS nanoparticles calculated by using band-gap energies steeply decreased from 4.5 nm to 2.2 nm within CTAB concentrations of 0.4-1.5 mmol L-1. Above the concentration of 1.5 mmol L-1, the radii were stabilized at R = 2.0 nm and increased up to R = 2.5 nm after 24 h. The hydrodynamic diameters of ZnS-CTAB structures observed by the dynamic light scattering (DLS) method ranged from 130 nm to 23 nm depending on CTAB concentrations of 0.5-1.5 mmol L-1. The complex structures were observed by scanning electron microscopy (SEM). At the higher CTAB concentrations, ZnS nanoparticles were surrounded by CTA(+) bilayers forming positively charged micelles with the diameter of 10 nm. The positive zeta-potentials of the micelles and their agglomerates were from 16 mV to 33 mV. Wurtzite and sphalerite nanoparticles with R = 2.0 nm and 2.5 nm covered by CTA(+). were modeled with and without water. Calculated sublimation energies confirmed that a bilayer arrangement of CFA(+) on the ZnS nanoparticles was preferred to a monolayer." . "2"^^ . "Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide" . . . . "RIV/00216208:11320/12:10128555!RIV13-GA0-11320___" . . "Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide"@en . . . "160939" . . . . "5"^^ . "Posp\u00ED\u0161il, Miroslav" . "Journal of Colloid and Interface Science" . "11320" .