Physicochemical properties of .ALPHA.,.OMEGA.-type surfactant in aqueous solution. Bis(triethylammonium)1,20-eicosanediyl disulfate.
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概要
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The physicochemical properties of the α,ω-type (bolaform) surfactant, bis(triethylammonium) 1,20-eicosanediyl disulfate (α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB>), in aqueous solution have been investigated by means of surface tension, electrical conductivity, dye solubilization and time-resolved fluorescence quenching. The critical micelle concentration of α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB> was 1–1.3×10<SUP>−3</SUP> mol dm<SUP>−3</SUP>. The micelle ionization degree of the surfactant was larger than a conventional surfactant having the same head group. From surface tension measurements, the molecular area of α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB> at the air–water interface was found to be about twice as large as that of a normal type surfactant, such as sodium dodecyl sulfate (SDS). This reveals that α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB> probably forms vertical looping ("wicket-like" conformation) at the air–water interface. By time-resolved fluorescence quenching measurements, the aggregation number of α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB> micelle was found to be strongly dependent on the concentration, but only slightly dependent on the temperature. At low concentrations the aggregation number is close to half that corresponding to a normal type surfactant having a chain length that is that of the bolaform. The solubilizing power of a micellar solution of α,ω C<SUB>20</SUB>N<SUB>2</SUB>Et<SUB>6</SUB> toward Orange OT was 7.6×10<SUP>−3</SUP> mol of dye per mol of surfactant, that is, a value smaller than that of SDS.
- 公益社団法人 日本化学会の論文
著者
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Ishikawa Motoharu
Department Of Obstetrics And Gynecology Kinki University School Of Medicine
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Esumi Kunio
Department Of Applied Chemistry And Institute Of Colloid And Interface Science Science University Of
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Ikeda Kenji
Department De Genie Chimique Universite Nationale De Yokohama
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Meguro Kenjiro
Department of Applied Chemistry and Institute of Colloid and Interface Science, Science University of Tokyo
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Yasuda Masaaki
Department of Applied Chemistry, Institute of Colloid and Interface Science, Science University of Tokyo
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YASUDA Masaaki
Department of Agricultural Chemistry, University of the Ryukyus
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Binana-Limbele William
CNRS, Institut C. Sadron (C.R.M.-E.A.H.P.)
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Zana Raoul
CNRS, Institut C. Sadron (C.R.M.-E.A.H.P.)
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