Time-resolved optical Kerr-effect investigation on CS2/polystyrene mixtures

Detalhes bibliográficos
Autor(a) principal: Heisler, Ismael Andre
Data de Publicação: 2005
Outros Autores: Correia, Ricardo Rego Bordalo, Buckup, Tiago, Cunha, Silvio Luiz Souza, Silveira, Nádya Pesce da
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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spelling 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
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dc.identifier.nrb.pt_BR.fl_str_mv 000522167
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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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