caa a22 4500 477139590 CHVBK 20180405111729.0 cr unu---uuuuu 170330e19970201xx s 000 0 eng 10.1007/BF02767916 doi (NATIONALLICENCE)springer-10.1007/BF02767916 Aggregation number of aqueous sodium cholate micelles from mutual diffusion measurements [Elektronische Daten] [Ling Hao, Ruanhui Lu, Derek Leaist, Peter Poulin] With reported values ranging from about 3 to 16, the aggregation number of aqueous sodium cholate micelles is not well established. To provide new information on the aggregation of a bile salt, Taylor dispersion is used to measure the binary mutual diffusion coefficientD of aqueous sodium cholate at concentrations from 0.001 to 0.100 mol-dm-3 at 25°C. The results are compared with calculatedD values based on the association equilibrium nCholate- + βnNa+ ⇋ (NaβCholate) n (β-1)n wheren is the aggregation number and β is the degree of sodium counterion binding. Fitting the association model to the diffusion data givesn = 3.9±0.6 and β = 0.21 ±0.08. In contrast to the drop inD with increasing concentration of sodium cholate, the diffusion coefficients of sodium dodecylsulfate and other long-chain ionic surfactants increase above the critical micelle region. The ent diffusion behavior of the surfactants is related to changes in the driving forces and mobilities caused by ion association. Plenum Publishing Corporation, 1997 Aggregation nationallicence bile salts nationallicence diffusion coefficient nationallicence binary mutual micelles nationallicence sodium cholate nationallicence aqueous nationallicence taylor dispersion nationallicence Hao Ling Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut Lu Ruanhui Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut Leaist Derek Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut Poulin Peter Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut Journal of Solution Chemistry Springer-Verlag 26/2(1997-02-01), 113-125 0095-9782 26:2<113 1997 26 10953 https://doi.org/10.1007/BF02767916 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02767916 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hao Ling Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut NATIONALLICENCE 700 1- Lu Ruanhui Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut NATIONALLICENCE 700 1- Leaist Derek Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut NATIONALLICENCE 700 1- Poulin Peter Department of Chemistry, University of Western Ontario, N6A 5B7, London, Ontario, Canada aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer-Verlag 26/2(1997-02-01), 113-125 0095-9782 26:2<113 1997 26 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer