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Title: Studies on the middle phase microemulsion of alkyl polyglucoside
Authors: Chai, Jinling
Yang, Xiaodeng
Gao, Yanhong
Wu, Changju
Issue Date: Jul-2007
Publisher: CSIR
Abstract: The middle phase microemulsions of alkyl polyglucosides (APG) C₈G₁․₄₆, C₁₀G₁․₄₆, C₁₂G₁․₄₆, C₈/₁₀G₁․₃₁ and C₁₂/14G₁․₄₃ have been studied with the alcohol concentration scanning phase diagram. The results show that in the quaternary system of APG/alcohol/alkane/water, the increase in the alcohol concentration causes a series of phase inversion Winsor I (2) → III(3) →II( ). The order of the alcohol width and the minimum alcohol concentration needed to form middle phase microemulsion is: C₈G₁․₄₆>C₈/₁₀G₁․₃₁>C₁₀G₁․₄₆>C₁₂G₁․₄₆>C₁₂/₁₄G₁․₄₃. Along with the increase in APG concentrations, the minimum alcohol concentrations increase, but that for unit APG, the concentrations decrease. The alcohol width increases first and then decreases, but that for per gram of APG decreases monotonously. The longer the alcohol hydrocarbon chain, the smaller both the alcohol width and the minimum alcohol concentration to form middle phase microemulsion, but the larger the solubilizing power. With the increase in NaCl concentrations, the minimum alcohol concentration decreases, but the alcohol width is nearly unchanged. This may be explained by “salting-out” effect. The effect of alkanes is different from that of NaCl concentrations; the minimum alcohol concentration is nearly the same, but the alcohol width increases as the alkane hydrocarbon chain length increases.
Page(s): 1075-1080
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.46A(07) [July 2007]

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