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《Chemical Research In Chinese Universities》 1991-10
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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 Ce, Shi Cai-yun, Chen Zong-qi, Xiao Gui-shi, Song Jiu-wei (Department of Applied Chemistry, Qindao Institute of Chemical Technology, Qingdao, 266042)Cheng De-shu (Institute of Photographic Chemistry, Chinese Academy Science, Beijing)  
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 (? in the alcohol, which can be described as - AGs→i0=6860+224n(35℃)△Hs→i0 = 92300 - 6700n and △6Ss→i0 = 321 - 21n.The relationship between the thermodynamic quantities and the oxyethylene unit number (n) of the surfactants were determined as
【Fund】: 国家自然科学基金
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