A Contribution to the Theory of Unemployment

Thalberg, Björn; Holte, Fritz C.

doi:10.2307/3440399

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1995

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“…The choice of ß' is of course somewhat arbitrary. With ß' changing from 0.7 to 0.85, u changed from 1500 to 1200 (K from [17][18][19][20][21][22] for the data at 25 °C. At 50 °C, the changes were even smaller.…”

Section: Resultsmentioning

confidence: 99%

Large C12TAB Micelles Formed in Complexes with Polyvinylsulfate and Dextran Sulfate

Hansson¹,

Almgren²

1995

J. Phys. Chem.

121

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The aggregation of alkyltrimethylammonium bromide (C"TAB) surfactants in very dilute aqueous solutions of sodium polyvinylsulfate (NaPVS) and sodium dextransulfate (NaDxS) has been investigated. The aggregation number, JVS, for the surfactant in complexes with the polyions was estimated with time-resolved fluorescence quenching. For C12TAB-NaPVS the aggregates at 50 °C are considerably larger ( -120) than free micelles, in contrast to what was found earlier (Hansson, P.; Almgren, M. Langmuir 1994M. Langmuir , 10, 2115 for complexes with sodium polyacrylate. The interaction with NaDxS also results in large micelles (Ns = 107). Binding isotherms for C12TAB in 0.5 mM NaPVS solutions at 25 and 50 °C were determined. The effect of temperature is small. The observed high cooperativity in the binding is consistent with the large aggregation number. The effect of NaDxS concentration on the cac was investigated and found to be equivalent to the effect of simple salt. The relation between intrinsic binding strength, cooperativity, and aggregation number is discussed.

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