Two-Photon Absorption Properties of Chromophores in Micelles: Electrostatic Interactions
| العنوان: | Two-Photon Absorption Properties of Chromophores in Micelles: Electrostatic Interactions |
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| المؤلفون: | Guda Ramakrishna, Semere Ghebru Bairu |
| المصدر: | The Journal of Physical Chemistry B. 117:10484-10491 |
| بيانات النشر: | American Chemical Society (ACS), 2013. |
| سنة النشر: | 2013 |
| مصطلحات موضوعية: | Photons, Cetrimonium, Octoxynol, Chemistry, Static Electricity, Cationic polymerization, Analytical chemistry, Sodium Dodecyl Sulfate, Chromophore, Micelle, Two-photon absorption, Absorption, Surfaces, Coatings and Films, chemistry.chemical_compound, Spectrometry, Fluorescence, Coumarins, Bromide, Cations, Cetrimonium Compounds, Materials Chemistry, Titration, Physical and Theoretical Chemistry, Sodium dodecyl sulfate, Absorption (chemistry), Micelles |
| الوصف: | Two-photon absorption (2PA) cross sections of neutral Coumarin 485 (C485) and anionic Coumarin 519 (C519(-)) solubilized in Triton X-100 (Tx-100, neutral), sodium dodecyl sulfate (SDS, anionic), and cetyltrimethylammonium bromide (CTAB, cationic) are reported. The objective of the study is to probe the influence of local electrostatic fields in micelles on the 2PA properties of chromophores. The 2PA measurements have shown that the cross sections of neutral C485 are unchanged in different micellar environments, although the local micropolarities of chromophores are different. On the other hand, the 2PA cross sections of C519(-) are unchanged or slightly decreased in Tx-100 and SDS micelles when compared to water while 100% increase in 2PA cross sections was observed for C519(-) in CTAB micelles. The enhancement in 2PA cross section is attributed to the electrostatic fields arising in the Stern layer of CTAB, where C519(-) is solubilized. The titration measurements have shown that the 2PA enhancement is due to the organized medium only and not because of the simple association of C519(-) and the quaternary ammonium group of CTAB. From the analysis, local electric field of 0.7 ± 0.3 MV/cm is estimated for the Stern layer of CTAB. |
| تدمد: | 1520-5207 1520-6106 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c08325bc9ff73e02742045cadc337a0 https://doi.org/10.1021/jp405416d |
| رقم الأكسشن: | edsair.doi.dedup.....9c08325bc9ff73e02742045cadc337a0 |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205207 15206106 |
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