Micellar dissociation of TPGS 1000 in water: a dynamic light scattering (DLS) study / Nik Nor Roszakimah Ibrahim @ Nik Yusoff

Micellar dissociation is a phenomenon that occurs when the concentration of surfactants are increased beyond the critical rnicelle concentration (CMC). In this study, three different series of concentration of surfactant TPGS 1000 have been prepared by using direct dissolution of the surfactant in the water. The Malvern Zetasizer Nano ZS instrument was used in order to measure the size distribution of the micelles inside the solution system. The size parameters such as average particle size (Z Average), polydispersity index (Pdl) and diffusion coefficient (Do.) whereas the zeta potential parameters such as zeta potential (ZP), mobility and conductance have been estimated in order to understand the rnicellar dissociation phenomenon. It is observed that the size of the micelles were reduced with the increased of concentration of TPGS 1000. The observed trend can be ascribed to the fact of micellar dissociation. Do which defines the velocity of Brownian motion shows the increased in the value beyond the CMC ofTPGS 1000.