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Studies on CMC and thermodynamic
function of anionic surfactants in DMA/long-chain alcohol systems
using microcalorimetric method |
| ZHANG Honglin1, KONG Zhe1, YAN Yongmei1, YU Li2, LI Zhen2 |
| 1.College of Chemical Science, Qufu Normal University; 2.Key Lab for Colloid and Interface Chemistry of Ministry of Education, Shandong University; |
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Abstract The critical micelle concentration (CMC) and the thermodynamic function of the anionic surfactant, sodium laurate (SLA) and sodium dodecyl sulfate (SDS) in the N,N-dimethyl acetamide (DMA)/long-chain alcohol systems were studied using titration microcalorimetric method. The power-time curves of SLA and SDS in the presence of a long-chain alcohol (n-heptanol, n-octanol, n-nonanol, n-decanol) in the DMA medium were determined. Then, from the curves, the critical micelle concentration (CMC) and the thermodynamic standard formation functions (?H?m, ?G?m and ?S?m) were obtained through thermodynamic theories. The relationships between temperature, alcohol’s carbon number, concentration and thermodynamic properties were discussed. For SLA or SDS in a DMA solution, under the same concentration of alcohol, the values of CMC, ?H?m and ?S?m increase, while the values of ?G?m decrease with the increase of temperature. Under the same condition of identical temperature and alcohol concentration, the values of CMC, ?H?m, ?G?m and ?S?m decrease with the increase of the alcohol’s carbon number. In the presence of the same kind of alcohol, the values of CMC and ?G?m increase, but the values of ?H?m and ?S?m decrease with the concentration increases in alcohol series at the same temperature.
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Issue Date: 05 March 2008
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