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Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol

Recently, it has been demonstrated that the glassy dynamics of the molecular liquids and polymers confined at the nanoscale level might satisfy the density scaling law (ρ(γ)/T) with the same value of the scaling exponent, γ, as that determined from the high-pressure studies of the bulk material. In...

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Autores principales: Chat, Katarzyna, Szklarz, Grzegorz, Adrjanowicz, Karolina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9065994/
https://www.ncbi.nlm.nih.gov/pubmed/35515549
http://dx.doi.org/10.1039/c9ra02289a
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author Chat, Katarzyna
Szklarz, Grzegorz
Adrjanowicz, Karolina
author_facet Chat, Katarzyna
Szklarz, Grzegorz
Adrjanowicz, Karolina
author_sort Chat, Katarzyna
collection PubMed
description Recently, it has been demonstrated that the glassy dynamics of the molecular liquids and polymers confined at the nanoscale level might satisfy the density scaling law (ρ(γ)/T) with the same value of the scaling exponent, γ, as that determined from the high-pressure studies of the bulk material. In this work, we have tested the validity of this interesting experimental finding for strongly hydrogen-bonded molecular liquid, dipropylene glycol (DPG), which is known to violate the ρ(γ)/T scaling rule in the supercooled liquid bulk state. The results of the independent dielectric relaxation studies carried out on increased pressure and in nanopores, have led to an important finding that when the density change induced by geometrical confinement is not very large, DPG can still obey the density scaling law with the same value of the scaling exponent as that found for the bulk sample. In this way, we confirm that the information obtained from the universal density scaling approach applied to nanoscale confined systems is somehow consistent with the macroscopic ones and that in both cases the same fundamental rules governs the glass-transition dynamics.
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spelling pubmed-90659942022-05-04 Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol Chat, Katarzyna Szklarz, Grzegorz Adrjanowicz, Karolina RSC Adv Chemistry Recently, it has been demonstrated that the glassy dynamics of the molecular liquids and polymers confined at the nanoscale level might satisfy the density scaling law (ρ(γ)/T) with the same value of the scaling exponent, γ, as that determined from the high-pressure studies of the bulk material. In this work, we have tested the validity of this interesting experimental finding for strongly hydrogen-bonded molecular liquid, dipropylene glycol (DPG), which is known to violate the ρ(γ)/T scaling rule in the supercooled liquid bulk state. The results of the independent dielectric relaxation studies carried out on increased pressure and in nanopores, have led to an important finding that when the density change induced by geometrical confinement is not very large, DPG can still obey the density scaling law with the same value of the scaling exponent as that found for the bulk sample. In this way, we confirm that the information obtained from the universal density scaling approach applied to nanoscale confined systems is somehow consistent with the macroscopic ones and that in both cases the same fundamental rules governs the glass-transition dynamics. The Royal Society of Chemistry 2019-07-04 /pmc/articles/PMC9065994/ /pubmed/35515549 http://dx.doi.org/10.1039/c9ra02289a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Chat, Katarzyna
Szklarz, Grzegorz
Adrjanowicz, Karolina
Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title_full Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title_fullStr Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title_full_unstemmed Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title_short Testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
title_sort testing density scaling in nanopore-confinement for hydrogen-bonded liquid dipropylene glycol
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9065994/
https://www.ncbi.nlm.nih.gov/pubmed/35515549
http://dx.doi.org/10.1039/c9ra02289a
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