Výsledky vyhledávání - "Efeitos de feixe iônico"

Confinement effects of ion tracks in ultrathin polymer films

Autor: Ricardo Meurer Papaléo, V. M. de Menezes, R.S. Thomaz, Pedro Luis Grande, Eduardo M. Bringa, Diego Tramontina, L. I. Gutierres, Daniel Severin, Christina Trautmann

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

We show direct experimental evidence that radiation effects produced by single MeV heavy ions on a polymer surface are weakened when the length of the ion track in the material is confined into layers of a few tens of nanometers. Deviation from the b

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1f1432e4ff11983ba27ebb5804031411
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.118302

Zobrazit plný text záznamu

Tracks and voids in amorphous Ge induced by swift heavy-ion irradiation

Autor: Nigel Kirby, Boshra Afra, Mark C Ridgway, Leandro Araujo, Baerbel Rethfeld, Olli H. Pakarinen, O. Osmani, Flyura Djurabekova, Thomas Bierschenk, Kai Nordlund, Aidan Byrne, Marika Schleberger, Raquel Giulian, Matias Rodriguez, Nikita Medvedev, Patrick Kluth

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Ion tracks formed in amorphous Ge by swift heavy-ion irradiation have been identified with experiment and modeling to yield unambiguous evidence of tracks in an amorphous semiconductor. Their underdense core and overdense shell result from quenched-i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a38268c8785ece98fd01ff0160f82c5
https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&origin=inward&scp=84879090634

Zobrazit plný text záznamu

Competing influence of damage buildup and lattice vibrations on ion range profiles in Si

Autor: Moni Behar, Matthias Posselt, R. Grötzschel, Marylou Mäder

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Phosphorus depth profiles in Si obtained by 140 keV implantation in the [001] axial channel direction and in a direction 7° off axis are investigated at two different doses (531013 and 5 31015 cm22) for implantation temperatures of 350 °C and room

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5caa6d72ddf1403d195b3cafc6247d3
https://doi.org/10.1063/1.1594281

Zobrazit plný text záznamu

Dissertation/ Thesis

Estabilidade de nanopartículas em sílica : efeitos térmicos e de irradiação com elétrons e íons energéticos

Autor: Luce, Flavia Piegas

Publikováno v: Biblioteca Digital de Teses e Dissertações da UFRGSUniversidade Federal do Rio Grande do SulUFRGS.

Por apresentarem uma alta razão de área de interface por volume, sistemas de nanopartículas são termodinamicamente instáveis e podem perder suas vantagens funcionais em função de modificações estruturais induzidas por variações de parâmet

Externí odkaz: http://hdl.handle.net/10183/61842

Zobrazit plný text záznamu

Nanoscale density fluctuations in swift heavy ion irradiated amorphous SiO2

Autor: Kluth, Patrick, Pakarinen, O. H., Djurabekova, F., Giulian, Raquel, Ridgway, M.C., Byrne, A. P., Nordlund, K.

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We report on the observation of nanoscale density fluctuations in 2 μm thick amorphous SiO2 layers irradiated with 185 MeV Au ions. At high fluences, in excess of approximately 5 1012 ions=cm², where the surface is completely covered by ion tracks,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::1396109576ab65ee506cfaafad1b9925

Zobrazit plný text záznamu

Role of Thermodynamics in the Shape Transformation of Embedded Metal Nanoparticles Induced by Swift Heavy-Ion Irradiation

Autor: Mark C Ridgway, Giancarlo Rizza, David Llewellyn, Marcel Toulemonde, Leandro Araujo, Raquel Giulian, David J. Sprouster, Patrick Kluth, Hiro Amekura, Paulo Fernando Papaleo Fichtner, Felipe Kremer, Aidan Byrne

Publikováno v: Physical Review Letters
Physical Review Letters, 2011, 106, pp.095505. ⟨10.1103/PhysRevLett.106.095505⟩
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Physical Review Letters, American Physical Society, 2011, 106, pp.095505

International audience; Swift heavy-ion irradiation of elemental metal nanoparticles (NPs) embedded in amorphous SiO2 induces a spherical to rodlike shape transformation with the direction of NP elongation aligned to that of the incident ion. Large,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a7f04cfaa23cbec3d39bf2cdf1ae01d
https://hal.science/hal-00574354

Zobrazit plný text záznamu

Ion irradiation effects on the exchange bias in IrMn/Co films

Autor: Luis Gustavo Pereira, Julian Penkov Geshev, Deise Schafer, Pedro Luis Grande

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

The present work reports on the influence of ion irradiation in exchange-coupled bilayers. Magnetron-sputtered IrMn4 /Co films were irradiated with 40 keV He+ ions and the dependence of their magnetic properties was studied as function of ion fluence

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2355c896251aa0313ed7513be2ba3333

Zobrazit plný text záznamu

Shape transformation of Sn nanocrystals induced by swift heavy-ion irradiation and the necessity of a molten ion track

Autor: David J. Sprouster, Paulo Fernando Papaleo Fichtner, Aidan Byrne, Raquel Giulian, Felipe Kremer, Mark C Ridgway, Leandro Araujo, Patrick Kluth

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We report on the spherical to rodlike shape transformation of Sn nanocrystals (NCs) embedded in amorphous SiO2 following irradiation with 185 MeV Au ions. Consistent with previous reports for other metals, transmission electron microscopy demonstrate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc31158f45d5eda0ab68dedd561171a5

Zobrazit plný text záznamu

Dissertation/ Thesis

Aplicação do modo de nanolitografia de um microscópio de força atômica para a estruturação de superfícies

Autor: Carreira, Willian Hasenkamp

Publikováno v: Biblioteca Digital de Teses e Dissertações da UFRGSUniversidade Federal do Rio Grande do SulUFRGS.

Neste trabalho, estudamos o processo de nanoestruturação de superfícies por microscopia de força atômica. O processo de indução mecânica de deformações foi abordado sob o enfoque de duas técnicas: a aragem dinâmica e a aragem estática. E

Externí odkaz: http://hdl.handle.net/10183/53120

Zobrazit plný text záznamu

Relaxation times of nanoscale deformations on the surface of a polymer thin film near and below the glass transition

Autor: Ricardo Meurer Papaléo, Luiz Gustavo de Moura da Silva Barbosa, Willian Hasenkamp Carreira, Ivo Bello, Agostinho Antônio Bulla, Rafael Gustavo Torres Leal

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We report on measurements of relaxation times of nanometer-sized deformations resulting from the impact of individual energetic ions on poly(methyl methacrylate) surfaces at temperatures close to and below the glass transition T{sub g}. The temporal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab60478e0ccd1c8431679bf0e5483b95
https://doi.org/10.1103/physrevb.74.094203

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání