The Effects of Branched-Tail Structure of Surfactant on the Phase Behaviour of Alkylglucoside/Water/n-Octane Ternary System

Abstract:

Two glycolipids were synthesized to study the lyotropic behavior of these glycolipids in alkylglucoside/water/n-octane ternary system. These glycolipids have been distinguished based on the structure of alkyl chain (branched-alkyl chain and straight alkyl chain). 2-octyl-β-D-glucopyranoside (2-OG) and 2-ethylhexyl-β-D-glucopyranoside (2-EHG) were used as surfactants to perform two types of phase diagram. Phase behaviours investigated were phase behaviours of 2-OG/n-octane/water ternary system and 2-EHG/n-octane/water ternary system. Small angle x-ray (SAXS) and optical polarizing microscope were used as the instruments to study the lyotropic phase behaviour of these two surfactans in ternary phase diagram. Study the effect of branched-tail structure on the phase behaviour of glycolipids in ternary system is one of strategy to derive the structure-property relationship. For this purpose, 2-OG and 2-EHG were used as surfactants in the same ternary system. The phase diagram of 2-OG/water/n-octane ternary system showed rectangular ribbon phase and lamellar phase. The phase diagram of 2-EHG/water/n-octane ternary system showed wide region of lamellar lyotropic liquid crystalline in different ratio of weight composition. In 2-OG/water/n-octane ternary system, as more surfactant was added to the system, the interlayer spacing, d₁ and scattering angle, a value increased, whereas in 2-EHG/water/n-octane ternary system, the d₁ and a value decreased.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 944-949
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.944
• Online since: April 2015
• Authors: Irwana Nainggolan*, Shahidan Radiman, Ahmad Sazali Hamzah, Rauzah Hashim
• Keywords: Glucoside, Glycolipid, Lamellar Phase, Lyotropic, Phase Diagram

References

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