Stabilization of ZnS nanoparticles in micellar dispersion of cetyltrimethylammonium bromide

Abstract

ZnS nanoparticles were precipitated in micellar dispersions of cetyltrimethylammonium bromide (CTAB). ZnS na no - particles and cetyltrimethylammonium (CTA+) ions for med po si ti vely char ged Zn S-CTA mi cel les with the mo de ze ta potential of 35 mV. The ZnS-CTA micelles were simulated by molecular modelling that confirmed the formation of po - sitive CTA+ bilayers on the ZnS surfa ce. The large agglomerates of the ZnS-CTA micelles were observed by the dynamic light scat te ring (DLS) met hod and electron transmission microscopy (TEM). The si ze of the Zn S na no par tic les of about 5 nm was es ti ma ted from their band-gap energy ob tai ned from UV spec tra and electron transmission mi cro - graphs. The relationship between zeta potentials (ξ) and hydrody na mic si zes (d) was found as ξ = 641/d – 5.9.