Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight
Autor(a) principal: | |
---|---|
Data de Publicação: | 2001 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/103849 |
Resumo: | Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 MeV, 85 MeV and 197 MeV gold ions are used to bombard the targets at grazing incidence (79° to the surface normal). Induced surface tracks consist of an elliptical crater followed by a hillock elongated in the direction of the ion incidence. For a given ion energy, the crater size is largest on the lowest Mw film. Crater dimensions are systematically reduced on films of heavier macro-molecules, up to a molecular weight of about 1.6 X 10⁵u. For Mw>1.6 X 10⁵u, the crater size remains approximately constant. The difference observed for the lateral dimensions of the craters are about 50% when comparing the lowest and the highest Mw films at a fixed energy. The observed saturation of the crater size for high Mw values coincides with the onset of entanglement effects in the polymer, which influences the viscosity and the compliance of the material. Moreover, the curve of the crater size versus Mw follows the same trend as the reciprocal viscosity (ηˉ¹) versus Mw , indicating that the viscosity is governing the final lateral dimensions of the craters. The hillock dimensions present a weak dependence on Mw , above a threshold at 3250u. The different behavior observed for craters and hillocks is discussed based on the viscoelastic properties of the polymer at different Mw and on the transient heating occurring close to the ion impact site. |
id |
UFRGS-2_2718f1fdda9fb7e35ca3e1b1bd6df16d |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/103849 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Farenzena, Lucio SartoriLivi, Rogerio PohlmannAraujo, Marco Aurelio deGarcía Bermúdez, Gerardo JosePapaleo, Ricardo Meurer2014-09-26T02:10:51Z20011098-0121http://hdl.handle.net/10183/103849000289369Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 MeV, 85 MeV and 197 MeV gold ions are used to bombard the targets at grazing incidence (79° to the surface normal). Induced surface tracks consist of an elliptical crater followed by a hillock elongated in the direction of the ion incidence. For a given ion energy, the crater size is largest on the lowest Mw film. Crater dimensions are systematically reduced on films of heavier macro-molecules, up to a molecular weight of about 1.6 X 10⁵u. For Mw>1.6 X 10⁵u, the crater size remains approximately constant. The difference observed for the lateral dimensions of the craters are about 50% when comparing the lowest and the highest Mw films at a fixed energy. The observed saturation of the crater size for high Mw values coincides with the onset of entanglement effects in the polymer, which influences the viscosity and the compliance of the material. Moreover, the curve of the crater size versus Mw follows the same trend as the reciprocal viscosity (ηˉ¹) versus Mw , indicating that the viscosity is governing the final lateral dimensions of the craters. The hillock dimensions present a weak dependence on Mw , above a threshold at 3250u. The different behavior observed for craters and hillocks is discussed based on the viscoelastic properties of the polymer at different Mw and on the transient heating occurring close to the ion impact site.application/pdfengPhysical review. B, Condensed matter and materials physics. Woodbury. Vol. 63, no. 10 (Mar. 2001), 104108 7p.FísicaPolímeros : DeformaçãoBombardeamento de ionsFilmes finosMicroscopia de força atômicaViscosidadeEfeitos de feixe iônicoCratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weightEstrangeiroinfo: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:UFRGSORIGINAL000289369.pdf000289369.pdfTexto completo (inglês)application/pdf345381http://www.lume.ufrgs.br/bitstream/10183/103849/1/000289369.pdf5136587cd56fd51139da250e42e173fcMD51TEXT000289369.pdf.txt000289369.pdf.txtExtracted Texttext/plain28759http://www.lume.ufrgs.br/bitstream/10183/103849/2/000289369.pdf.txt92eab1e5f45ecbe2d1cb48f1b2c8404fMD52THUMBNAIL000289369.pdf.jpg000289369.pdf.jpgGenerated Thumbnailimage/jpeg1867http://www.lume.ufrgs.br/bitstream/10183/103849/3/000289369.pdf.jpg3b26880287976b591c868588c351f656MD5310183/1038492018-10-08 08:14:02.202oai:www.lume.ufrgs.br:10183/103849Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-08T11:14:02Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
title |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
spellingShingle |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight Farenzena, Lucio Sartori Física Polímeros : Deformação Bombardeamento de ions Filmes finos Microscopia de força atômica Viscosidade Efeitos de feixe iônico |
title_short |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
title_full |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
title_fullStr |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
title_full_unstemmed |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
title_sort |
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight |
author |
Farenzena, Lucio Sartori |
author_facet |
Farenzena, Lucio Sartori Livi, Rogerio Pohlmann Araujo, Marco Aurelio de García Bermúdez, Gerardo Jose Papaleo, Ricardo Meurer |
author_role |
author |
author2 |
Livi, Rogerio Pohlmann Araujo, Marco Aurelio de García Bermúdez, Gerardo Jose Papaleo, Ricardo Meurer |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Farenzena, Lucio Sartori Livi, Rogerio Pohlmann Araujo, Marco Aurelio de García Bermúdez, Gerardo Jose Papaleo, Ricardo Meurer |
dc.subject.por.fl_str_mv |
Física Polímeros : Deformação Bombardeamento de ions Filmes finos Microscopia de força atômica Viscosidade Efeitos de feixe iônico |
topic |
Física Polímeros : Deformação Bombardeamento de ions Filmes finos Microscopia de força atômica Viscosidade Efeitos de feixe iônico |
description |
Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 MeV, 85 MeV and 197 MeV gold ions are used to bombard the targets at grazing incidence (79° to the surface normal). Induced surface tracks consist of an elliptical crater followed by a hillock elongated in the direction of the ion incidence. For a given ion energy, the crater size is largest on the lowest Mw film. Crater dimensions are systematically reduced on films of heavier macro-molecules, up to a molecular weight of about 1.6 X 10⁵u. For Mw>1.6 X 10⁵u, the crater size remains approximately constant. The difference observed for the lateral dimensions of the craters are about 50% when comparing the lowest and the highest Mw films at a fixed energy. The observed saturation of the crater size for high Mw values coincides with the onset of entanglement effects in the polymer, which influences the viscosity and the compliance of the material. Moreover, the curve of the crater size versus Mw follows the same trend as the reciprocal viscosity (ηˉ¹) versus Mw , indicating that the viscosity is governing the final lateral dimensions of the craters. The hillock dimensions present a weak dependence on Mw , above a threshold at 3250u. The different behavior observed for craters and hillocks is discussed based on the viscoelastic properties of the polymer at different Mw and on the transient heating occurring close to the ion impact site. |
publishDate |
2001 |
dc.date.issued.fl_str_mv |
2001 |
dc.date.accessioned.fl_str_mv |
2014-09-26T02:10:51Z |
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/10183/103849 |
dc.identifier.issn.pt_BR.fl_str_mv |
1098-0121 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000289369 |
identifier_str_mv |
1098-0121 000289369 |
url |
http://hdl.handle.net/10183/103849 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 63, no. 10 (Mar. 2001), 104108 7p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/103849/1/000289369.pdf http://www.lume.ufrgs.br/bitstream/10183/103849/2/000289369.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/103849/3/000289369.pdf.jpg |
bitstream.checksum.fl_str_mv |
5136587cd56fd51139da250e42e173fc 92eab1e5f45ecbe2d1cb48f1b2c8404f 3b26880287976b591c868588c351f656 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1801224851487195136 |