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Citation: CHEN Fang-Bo, FANG Yun, WU Li-Na. Correlation between Micellization and Bulk Phase Behavior of Concentrated Sodium Dodecyl Sulfate Solution[J]. Chinese Journal of Applied Chemistry, ;2008, 25(4): 401-404. shu

Correlation between Micellization and Bulk Phase Behavior of Concentrated Sodium Dodecyl Sulfate Solution

1.
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122

Corresponding author: FANG Yun,
Received Date: 29 April 2007
Available Online: 10 September 2007
Fund Project: 国家自然科学基金(20371021)资助项目 (20371021)

The micellization behavior of sodium dodecyl sulfate (SDS) in the presence/absence of NaCl was investigated.The correlations between the micelle aggregation number (N_m),the viscosity (η),and equili-brium concentration of SDS monomer (c_UF) in the solution were studied by means of surface tension determination,steady-state fluorescence quenching,ultra-filtration,and viscosity analysis.It was found that N_m,η and c_UF increased with the increase of the SDS concentration,and η increased first during the micelle formation and earlier equilibrium phases,but subsequently decreased in the transition phases when micelle shape was changing.The micelle were sphere,rod,hexagonal phase and lamellar when the SDS concentration was 15~17 times lower than that of cmc,17 times lower than that of cmc,46 times lower than that of cmc,and 60 times higher than that of cmc,respectively,in the absence of NaCl.More micelle transitions were observed in the presence of 2% NaCl,and the transition trend was the same as that in the absence of NaCl when the SDS concentration was 370 times lower than that of cmc,after which the phase separation occurred because SDS was saturated.
- sodium dodecyl sulfate,
- critical micelle concentration,
- micelle aggregation number,
- equilibrium concentration,
- viscosity
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