Výsledky vyhledávání

Coupling of Caged Molecule Dynamics to JG β-Relaxation II: Polymers

Autor: Li-Min Wang, S. Capaccioli, K. L. Ngai, D. Prevosto

Publikováno v: The Journal of Physical Chemistry B. 119:12502-12518

At temperatures below the nominal glass transition temperature Tgα, the structural α-relaxation and the Johari-Goldstein (JG) β-relaxation are too slow to contribute to susceptibility measured at frequencies higher than 1 GHz. This is particularly

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ac8ddebcc97148e1180a0d9ce5e2684
https://doi.org/10.1021/acs.jpcb.5b07293

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Sub-Rouse modes in polymer thin films: Coupling to density and responding to physical aging

Autor: Simone Capaccioli, D. Prevosto, K. L. Ngai

The presence of sub-Rouse modes in bulk polymers with length scale and relaxation times in between the segmental α-relaxation and the Rouse modes had long been justified by theoretical consideration, and found in many experimental studies. The sub-R

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1b629574dbbd9f4228cebc8e040aa7a
http://hdl.handle.net/11568/843761

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Dynamic Crossover of Water Relaxation in Aqueous Mixtures: Effect of Pressure

Autor: Andrzej Grzybowski, S. Ancherbak, Simone Capaccioli, Marian Paluch, D. Prevosto, Sebastian Pawlus, Katarzyna Grzybowska

Publikováno v: The journal of physical chemistry letters 1 (2010): 1170–1175.
info:cnr-pdr/source/autori:Grzybowska, K.; Paluch, M.; Grzybowski, A.; Pawlus, S.; Ancherbak, S.; Prevosto, D.; Capaccioli, S./titolo:Dynamic Crossover of Water Relaxation in Aqueous Mixtures: Effect of Pressure/doi:/rivista:The journal of physical chemistry letters/anno:2010/pagina_da:1170/pagina_a:1175/intervallo_pagine:1170–1175/volume:1

In this Letter, we present results of dielectric measurements of water-propylene glycol oligomer mixtures at ambient and high pressure. The ? relaxation process that emerges with the addition of water exhibits unexpected behavior at elevated pressure

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6678aa96185f27cae8a5abebc4611cca
https://doi.org/10.1021/jz100154u

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Does the entropy and volume dependence of the structural α-relaxation originate from the Johari–Goldstein β-relaxation?

Autor: Mauro Lucchesi, D. Prevosto, K. L. Ngai, Pierangelo Rolla, S. Capaccioli

Publikováno v: Journal of non-crystalline solids 355 (2009): 705–711.
info:cnr-pdr/source/autori:Prevosto, D.; Capaccioli, S.; Lucchesi, M.; Rolla, P.A.; Ngai, K.L./titolo:Does the entropy and volume dependence of the structural alpha-relaxation originate from the JohariGoldstein beta-relaxation?/doi:/rivista:Journal of non-crystalline solids/anno:2009/pagina_da:705/pagina_a:711/intervallo_pagine:705–711/volume:355

Conventional theories of glass transition are focussed on reproducing the thermodynamic and dynamic properties of the structural α-process. However, in the last decade a class of secondary relaxations, called the Johari–Goldstein (JG) β-relaxatio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2002be1298efeef0f5cd53c797650ac2
https://doi.org/10.1016/j.jnoncrysol.2008.09.043

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Many-Body Nature of Relaxation Processes in Glass-Forming Systems

Autor: K. L. Ngai, D. Prevosto, Marian Paluch, Li-Min Wang, Simone Capaccioli

Publikováno v: The journal of physical chemistry letters 3 (2012): 735–743. doi:10.1021/jz201634p
info:cnr-pdr/source/autori:S. Capaccioli, M. Paluch, D. Prevosto, Li-Min Wang, K. L. Ngai/titolo:Many-Body Nature of Relaxation Processes in Glass-Forming Systems/doi:10.1021%2Fjz201634p/rivista:The journal of physical chemistry letters/anno:2012/pagina_da:735/pagina_a:743/intervallo_pagine:735–743/volume:3

Most glass-forming systems are composed of basic units interacting with each other with a nontrivial anharmonic potential. Naturally, relaxation and diffusion in glass formers is a many-body problem. Results from recent experimental studies are prese

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1255bcd822f771d32c2e14f601e1ff1a
https://pubmed.ncbi.nlm.nih.gov/26286282

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Revealing the rich dynamics of glass-forming systems by modification of composition and change of thermodynamic conditions

Autor: M. Shahin Thayyil, K. L. Ngai, Simone Capaccioli, D. Prevosto

Secondary relaxations have been classified into two types, depending on whether they are related to the structural α-relaxation in properties or not. Those secondary relaxations that are related to the α-relaxation may have fundamental importance,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::764d3a485983e84ce5f74ed0e3197acc
http://hdl.handle.net/11568/766995

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Coupling of Caged Molecule Dynamics to JG β-Relaxation III: Van der Waals Glasses

Autor: S. Capaccioli, Li-Min Wang, D. Prevosto, K. L. Ngai

In the first two papers separately on the polyalcohols and amorphous polymers of this series, we demonstrated that the fast dynamics observed in the glassy state at high frequencies above circa 1 GHz is the caged dynamics. We showed generally the int

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::522c7dfe0e6912afc486ceb3958d33a6
http://hdl.handle.net/11568/767018

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Effect of Interface Interaction on the Segmental Dynamics of Poly(vinylacetate) Investigated by Local Dielectric Spectroscopy

Autor: D. Prevosto, C. M. Roland, M. Labardi, Riccardo Casalini

Publikováno v: ACS macro letters 4 (2015): 1022–1026. doi:10.1021/acsmacrolett.5b00488
info:cnr-pdr/source/autori:Casalini, R.; Prevosto, D.; Labardi, M.; Roland, C.M./titolo:Effect of Interface Interaction on the Segmental Dynamics of Poly(vinylacetate) Investigated by Local Dielectric Spectroscopy/doi:10.1021%2Facsmacrolett.5b00488/rivista:ACS macro letters/anno:2015/pagina_da:1022/pagina_a:1026/intervallo_pagine:1022–1026/volume:4

The segmental dynamics of poly(vinyl acetate) (PVAc) thin films were measured in the presence of an aluminum interface and in contact with an incompatible polymer, poly(4-vinylpyridine). The local dielectric relaxation was found to be faster in thin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2e1deb3d1be4bf26e22297859fef4d2
http://www.cnr.it/prodotto/i/337619

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Equilibrated polyethylene single-molecule crystals: molecular-dynamics simulations and analytic model of the global minimum of the free-energy landscape

Autor: A. Barbieri, Pierangelo Rolla, Luca Larini, Dino Leporini, D. Prevosto

Publikováno v: Journal of Physics: Condensed Matter. 17:L199-L208

The crystalline state of a single polyethylene chain with N = 500 monomers is investigated by extensive MD simulations. The polymer is folded in a well defined lamella with ten stems of approximately equal length, arranged into a regular, hexagonal p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3109cc872e08d248aaef147290f91a41
https://doi.org/10.1088/0953-8984/17/19/l04

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Local Dielectric Spectroscopy of Polyvinylpyrrolidone-Mo6S2I8 Nanowire Composite

Autor: M. Labardi, J.H. Park, H.K. Nguyen, D. Prevosto, C.-Y. Seong, A. Mrzel, G. Scalia

Publikováno v: Journal of non-crystalline solids 379 (2013): 224.
info:cnr-pdr/source/autori:M. Labardi, J.H. Park, H.K. Nguyen, D. Prevosto, C.-Y. Seong, A. Mrzel, G. Scalia/titolo:Local Dielectric Spectroscopy of Polyvinylpyrrolidone-Mo6S2I8 Nanowire Composite/doi:/rivista:Journal of non-crystalline solids/anno:2013/pagina_da:224/pagina_a:/intervallo_pagine:224/volume:379

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=cnr_________::73eed5e676064f8fc57920e033e6e07b
http://www.cnr.it/prodotto/i/267663

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