| dc.creator | Talhavini, M | |
| dc.creator | Atvars, TDZ | |
| dc.date | 1998 | |
| dc.date | 11383 | |
| dc.date | 2014-12-02T16:24:57Z | |
| dc.date | 2015-11-26T16:11:37Z | |
| dc.date | 2014-12-02T16:24:57Z | |
| dc.date | 2015-11-26T16:11:37Z | |
| dc.date.accessioned | 2018-03-28T23:00:06Z | |
| dc.date.available | 2018-03-28T23:00:06Z | |
| dc.identifier | Journal Of Photochemistry And Photobiology A-chemistry. Elsevier Science Sa, v. 114, n. 1, n. 65, n. 73, 1998. | |
| dc.identifier | 1010-6030 | |
| dc.identifier | WOS:000073074200008 | |
| dc.identifier | 10.1016/S1010-6030(97)00307-9 | |
| dc.identifier | http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/63552 | |
| dc.identifier | http://www.repositorio.unicamp.br/handle/REPOSIP/63552 | |
| dc.identifier | http://repositorio.unicamp.br/jspui/handle/REPOSIP/63552 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1267128 | |
| dc.description | This work presents results for the temperature dependence of the photobleaching reactions of Fluorescein dissolved in poly(vinyl alcohol) (PVA) irradiated by a continuous 150 W Hg high pressure are lamp. We observed that the photobleaching process efficiency is dependent on: lamp power, dye concentration and temperature. Although the photobleaching processes can only be described by a single-exponential function for lower concentration samples, a biphasic model must be employed for intermediate concentrations, resulting in one slower and one faster processes, while, for higher concentration samples, even multiple-exponential functions are unable to fit the experimental data. This complex behavior is probably due to the co-existence of many different types of energy transfer and photochemical processes with different rate constants. Therefore, a model based on a sequential distribution of site occupation by the dye molecules in the matrix, controlled by dye-polymer interaction strengths, is proposed to explain the complex-exponential kinetic behavior. Moreover, photobleaching process efficiency is somewhat increased by temperature and, above the PVA glass transition temperature, T-g, (350 K), it follows a first order kinetics, fitted by a mono-exponential function. (C) 1998 Elsevier Science S.A. All rights reserved. | |
| dc.description | 114 | |
| dc.description | 1 | |
| dc.description | 65 | |
| dc.description | 73 | |
| dc.language | en | |
| dc.publisher | Elsevier Science Sa | |
| dc.publisher | Lausanne | |
| dc.publisher | Suíça | |
| dc.relation | Journal Of Photochemistry And Photobiology A-chemistry | |
| dc.relation | J. Photochem. Photobiol. A-Chem. | |
| dc.rights | fechado | |
| dc.rights | http://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy | |
| dc.source | Web of Science | |
| dc.subject | photobleaching | |
| dc.subject | fluorescein | |
| dc.subject | poly(vinyl alcohol) | |
| dc.subject | dye-polymer interactions | |
| dc.subject | Xanthene Dyes | |
| dc.subject | Blends | |
| dc.subject | Microscopy | |
| dc.subject | Dependence | |
| dc.subject | Solids | |
| dc.title | Dye-polymer interactions controlling the kinetics of fluorescein photobleaching reactions in poly(vinyl alcohol) | |
| dc.type | Artículos de revistas | |
