Journal of Physical Chemistry p. 5928 - 5930 (1987)
Update date:2022-08-11
Topics:
Shirahama, Keishiro
Nishiyama, Yoshinori
Takisawa, Noboru
Binding of N-alkylpyridinium chlorides (C10, C12, and C14) to dodecyl oxyethylene ether (C12E6 and C12E8) micelles is determined in the presence of 5 mol m-3 NaCl at various temperatures by potentiometry which employs an electrode responsive to the surfactants.Binding affinity is expressed in terms of a distribution coefficient, Kx, of a cationic surfactant between the aqueous bulk phase and the nonionic micellar phase, and is larger for an alkylpyridinium cation with a longer hydrocarbon chain.The values of Kx are divided into three regions depending on the mole fraction of bound cationic surfactant in a micelle, X.At X < 0.02, Kx remains constant, while for 0.02 < X < 0.2, the binding affinity decreases until it attains a plateau at X > 0.2.The constant Kx values reflect an intrinsic binding affinity (K0).With increase in X, electrostatic repulsion among bound cationic surfactants causes decreased Kx values, which may be analyzed by a simple electrostatic theory to estimate the position of bound cationic head groups.From the temperature dependence of K0, it is found that the binding process is nearly athermal for C12E8 micelles but exothermic for C12E6 micelles, the latter associated with the growth of micellar size with temperature.
View MorePenglai Qianwei Chemical Co., Ltd.
Contact:86-535-3357802
Address:Shahelu (north), Penglai, Shandong, China
Contact:+86-574-87642758
Address:Room 901, Yinyi Bund Building, 132 Renmin Road
Changzhou Welton Chemical Co., Ltd,
Contact:0086-519-85910828,85920537,85912897
Address:No.8 Jinlong Road, Binjiang Park, Changzhou, Jiangsu, China.
Hangzhou Dawn Ray Pharmaceutical Co.,Ltd
website:http://www.dawnraypharma.com/
Contact:+86-571-85335020
Address:1018 Guangyin Building,No.42 E.Fengqi Road,Hangzhou,310012 China
Contact:0510-85393305
Address:1619 Huishan Avenue, Huishan District, Wuxi,
Doi:10.1038/161650a0
()Doi:10.1016/S0040-4039(00)78741-7
(1980)Doi:10.1021/acscatal.6b01869
(2016)Doi:10.1007/s10870-014-0543-1
(2014)Doi:10.1039/C2971000465a
(1971)Doi:10.1021/jacs.0c02522
(2020)