Sains Malaysiana 43(4)(2014): 623–628

Microscopic Study of AOT and CTAB Anionic-rich Catanionic Phase

(Kajian Mikroskopik Anionik-kaya dalam Fasa Katanionik AOT dan CTAB)

CHUN YUAN TAN¹, KOK SIONG KHOO²*, SHAHIDAN RADIMAN², IRMAN ABDUL RAHMAN²& NUR FARHANA BT AMARI³

¹Centre of Foundation Studies, Universiti Tunku Abdul RahmanBuilding PE, No. 1, Jalan 13/4, 46200 Petaling Jaya, Selangor Darul Ehsan, Malaysia

²School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor, Malaysia

³Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor , Malaysia

Received: 10 August 2012/Accepted: 22 July 2013

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

ABSTRAK

Sistem katanionik dengan menggunakan anionik natrium bis-(2etilheksil)sulfosuccinat (AOT) dan kationik cetiltrimetilammonium bromida (CTAB) telah dikaji. Sistem ini disediakan melalui penambahan larutan CTAB kepada larutan AOT yang disediakan sehingga fasa kationik yang beranionik terhasil. Sistem kationik ini mengandungi dua jenis surfaktan yang berbeza dan garam disebabkan kewujudan interaksi elektrostatik pada perbezaan cas dalam surfaktan. Bahan hasilan ini memberi kesan kepada aktiviti permukaan surfaktan. Garispusat hidrodinamik menurun dan larutan menjadi jernih dengan penambahan kepekatan CTAB kepada larutan AOT. Kesimpulannya, hasil surfaktan baru dengan bahagian hidrofobik yang lebih besar dan garam akan mengaruhkan vesikel yang kecil terbentuk dalam sistem katanionik.

Kata kunci: Fasa anionik-kaya; interaksi elektrostatik; nombor rantai alkil; nombor surfaktan; sistem katanionik

REFERENCES

Andreozzi, P., Funari, S.S., La Mesa, C., Mariani, P., Ortore, M.G., Sinibaldi, R. & Spinozzi, F. 2010. Multi- to unilamellar transitions in catanionic vesicles. The Journal of Physical Chemistry B 114(24): 8056-8060.

Chen, W.J., Zhai, L.M., Li, G.Z., Li, B.Q. & Xu, J. 2004. Spontaneous vesicle formation and vesicle-tubular microstructure transition in aqueous solution of a poly-tailed cationic and anionic surfactants mixture. Journal of Colloid and Interface Science 278(2): 447-452.

Feitosa, E., Karlsson, G. & Edwards, K. 2006. Unilamellar vesicles obtained by simply mixing dioctadecyldimethylammonium chloride and bromide with water. Chemistry and Physics of Lipids 140(1-2): 66-74.

Fischer, A., Hebrant, M. & Tondre, C. 2002. Glucose encapsulation in catanionic vesicles and kinetic study of the entrapment/ release processes in the sodium dodecyl benzene sulfonate/ cetyltrimethylammonium tosylate/water system. Journal of Colloid and Interface Science 248(1): 163-168.

Fuangswasdi, A., Charoensaeng, A., Sabatini, D., Scamehorn, J., Acosta, E., Osathaphan, K. & Khaodhiar, S. 2006a. Mixtures of anionic and cationic surfactants with single and twin head groups: Adsorption and precipitation studies. Journal of Surfactants and Detergents 9(1): 21-28.

Fuangswasdi, A., Charoensaeng, A., Sabatini, D., Scamehorn, J., Acosta, E., Osathaphan, K. & Khaodhiar, S. 2006b. Mixtures of anionic and cationic surfactants with single and twin head groups: Solubilization and adsolubilization of styrene and ethylcyclohexane. Journal of Surfactants and Detergents 9(1): 29-37.

Hao, L., Nan, Y., Liu, H. & Hu, Y. 2006. Salt effects on aqueous cationic/anionic surfactant two-phase regions. Journal of Dispersion Science and Technology 27(2): 271-276.

Jurašin, D., Habuš, I. & Filipović-Vinceković, N. 2010. Role of the alkyl chain number and head groups location on surfactants self-assembly in aqueous solutions. Colloids and Surfaces A: Physicochemical and Engineering Aspects 368(1-3): 119-128.

Kaler, E.W., Murthy, A.K., Rodriguez, B.E. & Zasadzinski, J.A. 1989. Spontaneous vesicle formation in aqueous mixtures of single-tailed surfactants. Science 245(4924): 1371-1374.

Kondo, Y., Uchiyama, H., Yoshino, N., Nishiyama, K. & Abe, M. 1995. Spontaneous vesicle formation from aqueous solutions of didodecyldimethylammonium bromide and sodium dodecyl sulfate mixtures. Langmuir 11(7): 2380-2384.

Marques, E.F., Regev, O., Khan, A., da Graça Miguel, M. & Lindman, B. 1998. Vesicle formation and general phase behavior in the catanionic mixture SDS-DDAB-water. The anionic-rich side. Journal of Physical Chemistry B 102(35): 6746-6758.

Marques, E.F., Regev, O., Khan, A. & Lindman, B. 2003. Self-organization of double-chained and pseudodouble-chained surfactants: Counterion and geometry effects. Advances in Colloid and Interface Science 100-102(0): 83-104.

Tah, B., Pal, P., Mahato, M. & Talapatra, G.B. 2011. Aggregation behavior of SDS/CTAB catanionic surfactant mixture in aqueous solution and at the air/water interface. Journal of Physical Chemistry B 115(26): 8493-8499.

Tondre, C. & Caillet, C. 2001. Properties of the amphiphilic films in mixed cationic/anionic vesicles: A comprehensive view from a literature analysis. Advances in Colloid and Interface Science 93(1-3): 115-134.

Velázquez, M.M., Valero, M., Ortega, F. & Rodríguez González, J.B. 2007. Structure and size of spontaneously formed aggregates in Aerosol OT/PEG mixtures: Effects of polymer size and composition. Journal of Colloid and Interface Science 316(2): 762-770.

Zheng, L., Li, F., Hao, J. & Li, G. 1995. Fluorescence probe studies of bis(2-ethylhexyl) sodium sulfosuccinate (AOT) and AOT/cetyltrimethylammonium bromide (CTAB) systems. Colloids and Surfaces A: Physicochemical and Engineering Aspects 98(1-2): 11-18.

*Corresponding author; email: khoo@ukm.my