Microcalorimetric Studies on the CMC and Thermodynamic Functions of a Nonionic Surfactant (Tween80) in DMF/Long-Chain Alcohol Systems from <Emphasis Type="Italic">T</Emphasis>=298.15 to <Emphasis Type="Italic">T</Emphasis>=313.15 K |
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Authors: | Hong-lin Zhang Chang-qing Kong Shu-juan Yang Hong-yan Bi Jing Li |
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Institution: | (1) Ministry of Education, Key Lab for Colloid and Interface Chemistry of Shandong University, Jinan, 250100, People’s Republic of China;(2) College of Chemical Science, Qufu Normal University, Qufu Shandong, 273165, People’s Republic of China |
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Abstract: | The power-time curves of the micelle formation process were determined for the nonionic surfactant Tween80/nonaqueous solvent
(DMF)/long-chain alcohol (n-heptanol, n-octanol, n-nonanol, and n-decanol) systems by titration microcalorimetry at temperatures of (298.15, 303.15, 308.15, and 313.15) K. From the power-time
curves, the CMC and
DHm\uptheta\Delta H_{\mathrm{m}}^{\uptheta} values were obtained. The corresponding values of
DGm\uptheta\Delta G_{\mathrm{m}}^{\uptheta} and
DSm\uptheta\Delta S_{\mathrm{m}}^{\uptheta} were also calculated. The relationships of the CMC with the carbon number of the alcohol, the concentration of alcohol, and
the temperature, along with the thermodynamic functions, are discussed. |
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Keywords: | |
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