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Water-DMF 용액 중에 서 DTAB, TTAB, HTAB 미셀의 형성
Micellization of DTAB, TTAB, HTAB in Water-DMF Solution

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Authors
우규환전남인
Issue Date
1984
Publisher
서울대학교 사범대학
Citation
사대논총, Vol.29, pp. 73-93
Abstract
The CMC of long chain Alkyltrimethylammonium Bromides homologous series, HTAB(CTAB), TTAB, DTAB have been determined by means of electrical conductivity and surface tension measurements as a function of DMF molefractions(XDMF=0.00~0.30) at various temperatures(25°C~50°C). Thermodynamic parameters evaluated from experimental CMC values indicate that: 1) The micelle formation of these quaternary ammonium salts are relatively indifferent to the temperature change. 2) DMF solvent effect is remarkably large; ie. when the solvent composition changes XDMF=0.00→0.150 at 30°C, the corresponding changes of micellization parameters are ∆Gmo= -4.21→-2.45 kcal/mole, ∆Hmo=-1.27→-1.82 kcal/mole, ∆Smo=9.7→2.08 cal/deg for HTAB, ∆Gmo=-3.37→-1. 97kcal/mole, ∆Hmo= -1.53→-3.12 kcal/mole, ∆Smo=6.07→-5.12cal/deg for TTAB, ∆Gmo=-2.50→-1. 35kcal/mole, ∆Hmo= -1.34→-3.17 kcal/mole, ∆Smo=3.84→- 6.00calf deg for DTAB. 3) As the chain length of cation monomer of the surfactant increases, the solvent effect on the micelle formation is increasingly observed; ie, when the solvent composition changes XDMF=0.00→0.150 at 25°C, the CMC value increases sixfold for DTAB, ninefold for TTAB, nineteenfold for HTAB. This ~hows the quaternary ammonium salts micelle formation is inhibited in the Water-DMF solution as a result of cooperatively reduced hydrophobic interaction as the DMF content is increased. The inhibitory effect of DMF can be explained due to the rigidified Water-DMF liquid structure which will lead to the critically reduced entropy contribution, the main driving force on the micelle formation.
ISSN
1226-4636
Language
Korean
URI
https://hdl.handle.net/10371/72360
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College of Education (사범대학)Center for Educational Research (교육종합연구원)교육연구와 실천Journal of the College of Education (師大論叢) vol.28/29 (1984)
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