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http://dspace.mediu.edu.my:8181/xmlui/handle/123456789/4352| Title: | Aquisição de tempos de vida de fosforescência com resolução de fase e sua aplicação ao estudo de relaxações em polímeros |
| Keywords: | phase resolution lifetime determinations benzophenone polymer relaxation processes |
| Issue Date: | 30-May-2013 |
| Publisher: | Sociedade Brasileira de Química |
| Description: | We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystyrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes in the temperature range from 20 to 400K. A software that drives the spectrofluorimeter and controls both the cryosystem and the lock-in amplifier was developed. |
| URI: | http://koha.mediu.edu.my:8181/jspui/handle/123456789/4352 |
| Other Identifiers: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000300015 http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=3&spage=332 |
| Appears in Collections: | Chemistry |
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