Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles
The strong UV absorption of the bromide in aqueous solution undergoes a remarkable red shift of more than 10 nm induced by the addition of the salts that constitute a saline buffer. The maximum absorption wavelength of the bromide is displaced from approximately 194 nm in ultrapure water to waveleng...
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| Formato: | Articulo |
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2019
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/159147 |
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I19-R120-10915-1591472023-10-20T20:07:14Z http://sedici.unlp.edu.ar/handle/10915/159147 Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles Hermet, Melisa Bakás, Laura Susana Morcelle del Valle, Susana Raquel Bernik, Delia Leticia 2019 2023-10-20T14:11:25Z en Biología Bromide absorption UV spectra Cetyltrimethylammoniumbromide Micelles Pyrene excimer Interface CTAB The strong UV absorption of the bromide in aqueous solution undergoes a remarkable red shift of more than 10 nm induced by the addition of the salts that constitute a saline buffer. The maximum absorption wavelength of the bromide is displaced from approximately 194 nm in ultrapure water to wavelengths above 200 nm, depending on the composition of the solution. The bromide spectrum as counterion of the cetyltrimethylammonium in the surfactant CTAB also shows sensitivity to the aggregation behavior of the tensioactive, being able to detect intermolecular interactions even at concentrations lower than the critical micelle concentration. And, when the micelles are assembled, the bromide absorption detects the interfacial rearrangements caused by the incorporation of ions. To know more about those interfacial features, the pyrene molecular probe was used, taking advantage of the extensive knowledge of its spectroscopy. Pyrene verifies the existence of changes in the interfacial organization which confirm that the sensitivity of the bromide spectrum is based on the ability of the ion to detect its microenvironment, and therefore reaffirms that its absorption spectrumcan be used as a local sensor. The presentwork encourages the use of bromide as a sensor ion in the UV region between 190 and 210 nm, which would avoid the introduction of external molecular probes that could disturb the system. Centro de Investigación de Proteínas Vegetales Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Biología Bromide absorption UV spectra Cetyltrimethylammoniumbromide Micelles Pyrene excimer Interface CTAB |
| spellingShingle |
Biología Bromide absorption UV spectra Cetyltrimethylammoniumbromide Micelles Pyrene excimer Interface CTAB Hermet, Melisa Bakás, Laura Susana Morcelle del Valle, Susana Raquel Bernik, Delia Leticia Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| topic_facet |
Biología Bromide absorption UV spectra Cetyltrimethylammoniumbromide Micelles Pyrene excimer Interface CTAB |
| description |
The strong UV absorption of the bromide in aqueous solution undergoes a remarkable red shift of more than 10 nm induced by the addition of the salts that constitute a saline buffer. The maximum absorption wavelength of the bromide is displaced from approximately 194 nm in ultrapure water to wavelengths above 200 nm, depending on the composition of the solution. The bromide spectrum as counterion of the cetyltrimethylammonium in the surfactant CTAB also shows sensitivity to the aggregation behavior of the tensioactive, being able to detect intermolecular interactions even at concentrations lower than the critical micelle concentration. And, when the micelles are assembled, the bromide absorption detects the interfacial rearrangements caused by the incorporation of ions. To know more about those interfacial features, the pyrene molecular probe was used, taking advantage of the extensive knowledge of its spectroscopy. Pyrene verifies the existence of changes in the interfacial organization which confirm that the sensitivity of the bromide spectrum is based on the ability of the ion to detect its microenvironment, and therefore reaffirms that its absorption spectrumcan be used as a local sensor. The presentwork encourages the use of bromide as a sensor ion in the UV region between 190 and 210 nm, which would avoid the introduction of external molecular probes that could disturb the system. |
| format |
Articulo Articulo |
| author |
Hermet, Melisa Bakás, Laura Susana Morcelle del Valle, Susana Raquel Bernik, Delia Leticia |
| author_facet |
Hermet, Melisa Bakás, Laura Susana Morcelle del Valle, Susana Raquel Bernik, Delia Leticia |
| author_sort |
Hermet, Melisa |
| title |
Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| title_short |
Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| title_full |
Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| title_fullStr |
Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| title_full_unstemmed |
Bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| title_sort |
bromide counterion as a spectroscopic sensor at the interface of cetyltrimethylammonium micelles |
| publishDate |
2019 |
| url |
http://sedici.unlp.edu.ar/handle/10915/159147 |
| work_keys_str_mv |
AT hermetmelisa bromidecounterionasaspectroscopicsensorattheinterfaceofcetyltrimethylammoniummicelles AT bakaslaurasusana bromidecounterionasaspectroscopicsensorattheinterfaceofcetyltrimethylammoniummicelles AT morcelledelvallesusanaraquel bromidecounterionasaspectroscopicsensorattheinterfaceofcetyltrimethylammoniummicelles AT bernikdelialeticia bromidecounterionasaspectroscopicsensorattheinterfaceofcetyltrimethylammoniummicelles |
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1807221608957345792 |