Thermodynamic Properties of Microemulsion Composed of Nonionic Surfactants(Ⅱ)--The Effect of Alkyl Chain Length of Alcohol and Oxyethylene Unit of Nonionic Surfactants

Chem. J. Chinese Universities ›› 1991, Vol. 12 ›› Issue (10): 1357.

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Thermodynamic Properties of Microemulsion Composed of Nonionic Surfactants(Ⅱ)--The Effect of Alkyl Chain Length of Alcohol and Oxyethylene Unit of Nonionic Surfactants

Hao Ce¹, Shi Cai-yun¹, Chen Zong-qi¹, Xiao Gui-shi¹, Song Jiu-wei¹, Cheng De-shu²

1. Department of Applied Chemistry, Qindao Institute of Chemical Technology, Qingdao, 266042;
2. Institute of Photographic Chemistry, Chinese Academy Science, Beijing

Received:1990-06-05 Online:1991-10-24 Published:1991-10-24

Abstract

Abstract: The Microemulsions composed of nonionic surfactants are a quaternary mixtures consisting of polyphenol oxyethlene ethers, oil (toluene), water and alcohol (hexanol). The systems were studied thermodynamically by means of dilution to determine the standard free energy for alcohol to tranfer from the oil phase to the interfacial region. From the effects of temperature, the entropy and enthalpy were calculated. The effect of chain length of the alcohol is described. It is found that the thermodynamic functions change linearly with the increase of the number of carbons (n) in the alcohol, which can be described as-AGs→△G_s→i⁰=6860+224n(35℃)△H_s→i⁰ = 92300-6700n and △S_s→i⁰ = 321-21n.

Key words: Microemulsion, Thermodynamic property, Nonionic surfactants

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Hao Ce, Shi Cai-yun, Chen Zong-qi, Xiao Gui-shi, Song Jiu-wei, Cheng De-shu. Thermodynamic Properties of Microemulsion Composed of Nonionic Surfactants(Ⅱ)--The Effect of Alkyl Chain Length of Alcohol and Oxyethylene Unit of Nonionic Surfactants[J]. Chem. J. Chinese Universities, 1991, 12(10): 1357.

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Thermodynamic Properties of Microemulsion Composed of Nonionic Surfactants(Ⅱ)--The Effect of Alkyl Chain Length of Alcohol and Oxyethylene Unit of Nonionic Surfactants

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