| Full text | |
| Author(s): |
Lima, Filipe S.
[1]
;
Andrade, Marcos F. C.
[2]
;
Mortara, Laura
[2]
;
Dias, Luis Gustavo
[3]
;
Cuccovia, Iolanda M.
[4]
;
Chaimovich, Hernan
[4]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Pernambuco, Dept Quim Fundamental, Ctr Ciencias Exatas & Nat, Recife, PE - Brazil
[2] Univ Sao Paulo, Inst Quim, Dept Quim, Sao Paulo - Brazil
[3] Univ Sao Paulo, Dept Quim, FFCLRP, Ribeirao Preto - Brazil
[4] Univ Sao Paulo, Inst Quim, Dept Bioquim, Sao Paulo - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Physical Chemistry Chemical Physics; v. 19, n. 45, p. 30658-30666, DEC 7 2017. |
| Web of Science Citations: | 3 |
| Abstract | |
The properties of ionic micelles depend on the nature of the counterion, and these effects become more evident as the ion adsorption at the interface increases. Prediction of the relative extent of ion adsorption is required for rational design of ionic micellar aggregates. Unlike the well understood adsorption of monatomic ions, the adsorption of polyatomic ions is not easily predicted. We combined experimental and computational methods to evaluate the affinity of hydrotropic ions, i.e., ions with polar and apolar regions, to the surface of positively charged micelles. We analyzed cationic micelles of dodecyltrimethylammonium and six hydrotropic counterions: methanesulfonate, trifluoromethanesulfonate, benzenesulfonate, acetate, trifluoroacetate and benzoate. Our results demonstrated that the apolar region of hydrotropic ions had the largest influence on micellar properties. The dehydration of the apolar region of hydrotropic ions upon their adsorption at the micellar interface determined the ion adsorption extension, differently to what was expected based on Collins' law of matching affinities. These results may lead to more general models to describe the adsorption of ions, including polyatomic ions, at the micellar interface. (AU) | |
| FAPESP's process: | 13/50096-4 - Ions specific effect in colloidal systems: combining experimental data and theoretical modeling |
| Grantee: | Filipe da Silva Lima |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/08166-5 - Interfacial chemistry: drugs, peptides and ezymes interactions with membrane models |
| Grantee: | Iolanda Midea Cuccovia |
| Support Opportunities: | Research Projects - Thematic Grants |