Author/Authors :
TAN, CHUN YUAN Universiti Tunku Abdul Rahman - Centre of Foundation Studies, Malaysia , KHOO, KOK SIONG Universiti Kebangsaan Malaysia - Faculty of Science and Technology, School of Applied Physics, Malaysia , RADIMAN, SHAHIDAN Universiti Kebangsaan Malaysia - Faculty of Science and Technology, School of Applied Physics, Malaysia , ABDUL RAHMAN, IRMAN Universiti Kebangsaan Malaysia - Faculty of Science and Technology, School of Applied Physics, Malaysia , BT AMARI, NUR FARHANA Universiti Kebangsaan Malaysia, Malaysia
Abstract :
Catanionic system using anionic sodium bis-(2ethylhexyl)sulfosuccinate (AOT) and cationic cetyltrimethylammonium bromide (CTAB) is studied. The system is prepared by addition of CTAB solution to a prepared AOT solution until slight anionic-rich catanionic phase is produced. Catanionic system consists of the mixture of different types of surfactants and counterion due to electrostatic interaction between the oppositely charged surfactant. Both of these products affect the in surface activity of the surfactant. Hydrodynamic diameters decrease and clearer solution were seen with the increase of CTAB concentration in solution mixture. As a result, mixed surfactant with larger hydrophobic region and the presence of counterion will induce smaller vesicle to form in catanionic system.
Keywords :
Alkyl chain number , anionic , rich phase , catanionic system , electrostatic interaction , surfactant number
