Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/204989 |
Resumo: | The relaxation dynamics of carbon disulfide are investigated in mixtures with polystyrene (PS) using the time-resolved optical heterodyne-detected optical Kerr effect (OHD-OKE). The data are analyzed using both the model-dependent approach, which assumes four distinct temporal responses, and the model-independent Fourier transform approach, which generates a spectral response that can be compared with results obtained by depolarized Rayleigh scattering. A slow dynamics is observed for the OHD-OKE transient decaying exponentially with a time constant that varies from 1.68ps for neat CS2 to 3.76ps for the most concentrated CS2∕PS mixture. The increase of this time constant accompanies an increase in the viscosity of the mixture, so we can associate this component with the diffusive reorientation process of the induced polarizability anisotropy of the carbon disulfide in the mixture. The short-time nuclear response is characterized in the frequency domain by a broad band that peaks around 30cm−1 for neat carbon disulfide, and is associated with a complex relaxation pattern. The vibrational distribution shifts to higher frequencies when the PS concentration is increased in the mixture. This result is discussed in terms of an increase in the interaction strength between the PS phenyl rings and the carbon disulfide molecules. |
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Heisler, Ismael AndreCorreia, Ricardo Rego BordaloBuckup, TiagoCunha, Silvio Luiz SouzaSilveira, Nádya Pesce da2020-01-28T04:11:39Z20050021-9606http://hdl.handle.net/10183/204989000522167The relaxation dynamics of carbon disulfide are investigated in mixtures with polystyrene (PS) using the time-resolved optical heterodyne-detected optical Kerr effect (OHD-OKE). The data are analyzed using both the model-dependent approach, which assumes four distinct temporal responses, and the model-independent Fourier transform approach, which generates a spectral response that can be compared with results obtained by depolarized Rayleigh scattering. A slow dynamics is observed for the OHD-OKE transient decaying exponentially with a time constant that varies from 1.68ps for neat CS2 to 3.76ps for the most concentrated CS2∕PS mixture. The increase of this time constant accompanies an increase in the viscosity of the mixture, so we can associate this component with the diffusive reorientation process of the induced polarizability anisotropy of the carbon disulfide in the mixture. The short-time nuclear response is characterized in the frequency domain by a broad band that peaks around 30cm−1 for neat carbon disulfide, and is associated with a complex relaxation pattern. The vibrational distribution shifts to higher frequencies when the PS concentration is increased in the mixture. This result is discussed in terms of an increase in the interaction strength between the PS phenyl rings and the carbon disulfide molecules.application/pdfengThe journal of chemical physics. New York. Vol. 123, no. 5 (Aug. 2005), 054509, 6 p.Efeito kerr oticoPolímerosViscosidadeTime-resolved optical Kerr-effect investigation on CS2/polystyrene mixturesEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT000522167.pdf.txt000522167.pdf.txtExtracted Texttext/plain33490http://www.lume.ufrgs.br/bitstream/10183/204989/2/000522167.pdf.txt8d983f3ce3a88a6a4ebaa0eb0ebf012cMD52ORIGINAL000522167.pdfTexto completo (inglês)application/pdf496934http://www.lume.ufrgs.br/bitstream/10183/204989/1/000522167.pdf14fa139040cab2778271d616e7e41e95MD5110183/2049892023-08-04 03:33:15.209986oai:www.lume.ufrgs.br:10183/204989Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-08-04T06:33:15Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
title |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
spellingShingle |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures Heisler, Ismael Andre Efeito kerr otico Polímeros Viscosidade |
title_short |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
title_full |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
title_fullStr |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
title_full_unstemmed |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
title_sort |
Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures |
author |
Heisler, Ismael Andre |
author_facet |
Heisler, Ismael Andre Correia, Ricardo Rego Bordalo Buckup, Tiago Cunha, Silvio Luiz Souza Silveira, Nádya Pesce da |
author_role |
author |
author2 |
Correia, Ricardo Rego Bordalo Buckup, Tiago Cunha, Silvio Luiz Souza Silveira, Nádya Pesce da |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Heisler, Ismael Andre Correia, Ricardo Rego Bordalo Buckup, Tiago Cunha, Silvio Luiz Souza Silveira, Nádya Pesce da |
dc.subject.por.fl_str_mv |
Efeito kerr otico Polímeros Viscosidade |
topic |
Efeito kerr otico Polímeros Viscosidade |
description |
The relaxation dynamics of carbon disulfide are investigated in mixtures with polystyrene (PS) using the time-resolved optical heterodyne-detected optical Kerr effect (OHD-OKE). The data are analyzed using both the model-dependent approach, which assumes four distinct temporal responses, and the model-independent Fourier transform approach, which generates a spectral response that can be compared with results obtained by depolarized Rayleigh scattering. A slow dynamics is observed for the OHD-OKE transient decaying exponentially with a time constant that varies from 1.68ps for neat CS2 to 3.76ps for the most concentrated CS2∕PS mixture. The increase of this time constant accompanies an increase in the viscosity of the mixture, so we can associate this component with the diffusive reorientation process of the induced polarizability anisotropy of the carbon disulfide in the mixture. The short-time nuclear response is characterized in the frequency domain by a broad band that peaks around 30cm−1 for neat carbon disulfide, and is associated with a complex relaxation pattern. The vibrational distribution shifts to higher frequencies when the PS concentration is increased in the mixture. This result is discussed in terms of an increase in the interaction strength between the PS phenyl rings and the carbon disulfide molecules. |
publishDate |
2005 |
dc.date.issued.fl_str_mv |
2005 |
dc.date.accessioned.fl_str_mv |
2020-01-28T04:11:39Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/204989 |
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0021-9606 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000522167 |
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0021-9606 000522167 |
url |
http://hdl.handle.net/10183/204989 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The journal of chemical physics. New York. Vol. 123, no. 5 (Aug. 2005), 054509, 6 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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