Abstract
ZnS nanoparticles were precipitated in micellar dispersions of cetyltrimethylammonium bromide (CTAB). ZnS nanoparticles and cetyltrimethylammonium (CTA(+)) ions formed positively charged ZnS-CTA micelles with the mode zeta potential of 35 mV.
The ZnS-CTA micelles were simulated by molecular modelling that confirmed the formation of positive CTA(+) bilayers on the ZnS surface. The large agglomerates of the ZnS-CTA micelles were observed by the dynamic light scattering (DLS) method and electron transmission microscopy (TEM).
The size of the ZnS nano particles of about 5 nm was estimated from their band-gap energy obtained from UV spectra and electron transmission micrographs. The relationship between zeta potentials (xi) and hydrodynamic sizes (d) was found as xi = 641/d - 5.9.