Ariffin, Azhar and Sim, Y.L. and Yusof, N.S.M. and Khan, M.N. (2011) Effects of Nonionic Micelles on the rate of Alkaline Hydrolysis Of N-(2 '-Methoxyphenyl)Phthalimide (1): kinetic and Rheometric evidence for a transition from spherical to rodlike micelles under the typical reaction conditions. Journal of Colloid and Interface Science, 360 (1). pp. 182-188. ISSN 0021-9797, DOI https://doi.org/10.1016/j.jcis.2011.04.021.
Full text not available from this repository.Abstract
Pseudo-first-order rate constants (k(obs)) for alkaline hydrolysis of N-(2'-methoxyphenyl)phthalimide (1) decrease nonlinearly with increasing total concentration of nonionic surfactant C(m)E(n) (i.e. [C(m)E(n)](T) where m and n represent the respective number of methyl/methylene units in the tail and polyoxyethylene units in the headgroup of a surfactant molecule and m/n = 16/20, 12/23 and 18/20) at constant 2% v/v CH(3)CN and 1.0 mM NaOH. The k(obs) vs. [C(m)E(n)](T) data follow the pseudophase micellar (PM) model at <= 50 mM C(16)E(20), <= 1.4 mM C(12)E(23) and <= 2.0 mM C(18)E(20) where rate of hydrolysis of 1 in micellar pseudophase could not be detected. The values of k(obs) fail to follow the PM model at > similar to 50 mM C(16)E(20), > similar to 1.4 mM C(12)E(23) and > similar to 2.0 mM C(18)E(20) which has been attributed to a micellar structural transition from spherical to rodlike which in turn increases C(m)E(n) micellar binding constant (K(s)) of 1 with increasing values of [C(m)E(n)](T). Rheological measurements show the presence of spherical micelles at <= 50 mM C(16)E(20), <= 1.4 mM C(12)E(23) and <= 3.0 mm C(18)E(20). The presence of rodlike micelles is evident from rheological measurements at > similar to 50 mM C(16)E(20), > 1.4 mM C(12)E(23) and > similar to 3.0 mM C(18)E(20). (C) 2011 Elsevier Inc. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Additional Information: | Department of Chemistry, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA |
| Uncontrolled Keywords: | N-(2′-Methoxyphenyl)phthalimide; Nonionic surfactant; Pseudophase micellar model; Spherical micelles; Rodlike micelles |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | Miss Malisa Diana |
| Date Deposited: | 03 Jul 2013 04:15 |
| Last Modified: | 27 Aug 2019 06:22 |
| URI: | http://eprints.um.edu.my/id/eprint/8093 |
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