Thermal analysis of PVA/CNTs 2D membrane |
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Authors: | Sangram K Samal Elizabeth G Fernandes Federica Chiellini Emo Chiellini |
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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 micellar formation of two anionic surfactants, sodium laurate (SLA) and sodium dodecyl sulfate (SDS),
in N,N-dimethyl acetamide (DMA) in the presence of various long-chain alcohols (1-heptanol, 1-octanol, 1-nonanol and 1-decanol)
were measured by titration microcalorimetry at 298 K. The critical micelle concentrations (CMCs) of SLA and SDS under various
conditions at 298 K were obtained based on the power–time curves. Thermodynamic parameters ( , and ) for micellar systems at 298 K were evaluated according to the power–time curves and the mass action model. The influences
of the number of carbon-atom and the concentration of alcohol were investigated. Moreover, combined the thermodynamic parameters
at 303, 308 and 313 K in our previous work and those of 298 K in the present work for SLA and SDS in DMA in the presence of
long-chain alcohols, an enthalpy–entropy compensation effect was observed. The values of the enthalpy of micellization calculated
by direct and indirect methods were made a comparison. |
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Keywords: | Long-chain alcohols Anionic surfactant Micellar properties DMA Microcalorimetry |
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