Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles
Pseudo-first-order rate constants (kobs) for the alkaline hydrolysis of phthalimide (PTH), obtained at a constant concentration of cetyltrimethylammonium bromide (CTABr) and 35°C, vary with the increase in the concentration of sodium phenylacetate and sodium sulfate (MX) according to the relationshi...
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| Format: | Article |
| Language: | English |
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Elsevier
2001
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| Online Access: | http://psasir.upm.edu.my/id/eprint/116097/ http://psasir.upm.edu.my/id/eprint/116097/1/116097.pdf |
| _version_ | 1848866927092432896 |
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| author | Khan, M.Niyaz Ahmad, Faujan B.H. |
| author_facet | Khan, M.Niyaz Ahmad, Faujan B.H. |
| author_sort | Khan, M.Niyaz |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Pseudo-first-order rate constants (kobs) for the alkaline hydrolysis of phthalimide (PTH), obtained at a constant concentration of cetyltrimethylammonium bromide (CTABr) and 35°C, vary with the increase in the concentration of sodium phenylacetate and sodium sulfate (MX) according to the relationship: kobs=(k0+θK[MX])/(1+K[MX]) where θ and K are empirical parameters. The value of θ/khW (where khW=kobs at [CTABr]T=[MX]=0) is the measure of the extent of expulsion of ionized PTH (S-) from CTABr micellar pseudophase to aqueous pseudophase by an inert anion (X-) provided S- is fully micellized in the absence of X-. Thus, the values of θ/khW for sodium phenylacetate (≈1) and sodium sulfate (≈0.12-0.19) are attributed to deeper micellar penetration of S- and phenylacetate ions compared to that of sulfate ions. Copyright © 2001 Elsevier Science B.V. |
| first_indexed | 2025-11-15T14:28:22Z |
| format | Article |
| id | upm-116097 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T14:28:22Z |
| publishDate | 2001 |
| publisher | Elsevier |
| recordtype | eprints |
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| spelling | upm-1160972025-03-19T04:20:37Z http://psasir.upm.edu.my/id/eprint/116097/ Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles Khan, M.Niyaz Ahmad, Faujan B.H. Pseudo-first-order rate constants (kobs) for the alkaline hydrolysis of phthalimide (PTH), obtained at a constant concentration of cetyltrimethylammonium bromide (CTABr) and 35°C, vary with the increase in the concentration of sodium phenylacetate and sodium sulfate (MX) according to the relationship: kobs=(k0+θK[MX])/(1+K[MX]) where θ and K are empirical parameters. The value of θ/khW (where khW=kobs at [CTABr]T=[MX]=0) is the measure of the extent of expulsion of ionized PTH (S-) from CTABr micellar pseudophase to aqueous pseudophase by an inert anion (X-) provided S- is fully micellized in the absence of X-. Thus, the values of θ/khW for sodium phenylacetate (≈1) and sodium sulfate (≈0.12-0.19) are attributed to deeper micellar penetration of S- and phenylacetate ions compared to that of sulfate ions. Copyright © 2001 Elsevier Science B.V. Elsevier 2001 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/116097/1/116097.pdf Khan, M.Niyaz and Ahmad, Faujan B.H. (2001) Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 181 (1-3). pp. 11-18. ISSN 0927-7757; eISSN: 0927-7757 https://linkinghub.elsevier.com/retrieve/pii/S0927775700004787 10.1016/S0927-7757(00)00478-7 |
| spellingShingle | Khan, M.Niyaz Ahmad, Faujan B.H. Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title | Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title_full | Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title_fullStr | Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title_full_unstemmed | Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title_short | Kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| title_sort | kinetic probe to study the structure of micelles: effects of inert inorganic and organic salts on the rate of alkaline hydrolysis of phthalimide in the presence of cationic micelles |
| url | http://psasir.upm.edu.my/id/eprint/116097/ http://psasir.upm.edu.my/id/eprint/116097/ http://psasir.upm.edu.my/id/eprint/116097/ http://psasir.upm.edu.my/id/eprint/116097/1/116097.pdf |