Interpenetration of polymeric microgels at ultrahigh densities

Abstract Soft particles such as polymeric microgels can form ultra-dense phases, where the average center-to-center distance a s can be smaller than the initial unperturbed particle diameter σ 0, due to their ability to interpenetrate and compress. However, despite of the effort devoted to microgels...

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Autores principales:	Priti S. Mohanty, Sofi Nöjd, Kitty van Gruijthuijsen, Jérôme J. Crassous, Marc Obiols-Rabasa, Ralf Schweins, Anna Stradner, Peter Schurtenberger
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e40e0616ef2447a9909ee1d294f3d7d9
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spelling	oai:doaj.org-article:e40e0616ef2447a9909ee1d294f3d7d92021-12-02T12:30:53ZInterpenetration of polymeric microgels at ultrahigh densities10.1038/s41598-017-01471-32045-2322https://doaj.org/article/e40e0616ef2447a9909ee1d294f3d7d92017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01471-3https://doaj.org/toc/2045-2322Abstract Soft particles such as polymeric microgels can form ultra-dense phases, where the average center-to-center distance a s can be smaller than the initial unperturbed particle diameter σ 0, due to their ability to interpenetrate and compress. However, despite of the effort devoted to microgels at ultrahigh densities, we know surprisingly little about their response to their environment at effective volume fractions ϕ eff above close packing (ϕ cp ), and the existing information is often contradictory. Here we report direct measurements of the size and shape of poly(N-isopropylacrylamide) microgels at concentrations below and above ϕ cp using the zero average contrast method in small-angle neutron scattering. We complement these experiments with measurements of the average interparticle distances using small-angle x-ray scattering, and a determination of the glass transition using dynamic light scattering. This allows us to unambiguously decouple interaction effects from density-dependent variations of the particle size and shape at all values of ϕ eff . We demonstrate that the microgels used in this study significantly interpenetrate and thus change their size and shape only marginally even for ϕ eff ≫ ϕ cp , a finding that may require changes in the interpretation of a number of previously published studies on the structural and dynamic properties of dense soft particle systems.Priti S. MohantySofi NöjdKitty van GruijthuijsenJérôme J. CrassousMarc Obiols-RabasaRalf SchweinsAnna StradnerPeter SchurtenbergerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Priti S. Mohanty Sofi Nöjd Kitty van Gruijthuijsen Jérôme J. Crassous Marc Obiols-Rabasa Ralf Schweins Anna Stradner Peter Schurtenberger Interpenetration of polymeric microgels at ultrahigh densities
description	Abstract Soft particles such as polymeric microgels can form ultra-dense phases, where the average center-to-center distance a s can be smaller than the initial unperturbed particle diameter σ 0, due to their ability to interpenetrate and compress. However, despite of the effort devoted to microgels at ultrahigh densities, we know surprisingly little about their response to their environment at effective volume fractions ϕ eff above close packing (ϕ cp ), and the existing information is often contradictory. Here we report direct measurements of the size and shape of poly(N-isopropylacrylamide) microgels at concentrations below and above ϕ cp using the zero average contrast method in small-angle neutron scattering. We complement these experiments with measurements of the average interparticle distances using small-angle x-ray scattering, and a determination of the glass transition using dynamic light scattering. This allows us to unambiguously decouple interaction effects from density-dependent variations of the particle size and shape at all values of ϕ eff . We demonstrate that the microgels used in this study significantly interpenetrate and thus change their size and shape only marginally even for ϕ eff ≫ ϕ cp , a finding that may require changes in the interpretation of a number of previously published studies on the structural and dynamic properties of dense soft particle systems.
format	article
author	Priti S. Mohanty Sofi Nöjd Kitty van Gruijthuijsen Jérôme J. Crassous Marc Obiols-Rabasa Ralf Schweins Anna Stradner Peter Schurtenberger
author_facet	Priti S. Mohanty Sofi Nöjd Kitty van Gruijthuijsen Jérôme J. Crassous Marc Obiols-Rabasa Ralf Schweins Anna Stradner Peter Schurtenberger
author_sort	Priti S. Mohanty
title	Interpenetration of polymeric microgels at ultrahigh densities
title_short	Interpenetration of polymeric microgels at ultrahigh densities
title_full	Interpenetration of polymeric microgels at ultrahigh densities
title_fullStr	Interpenetration of polymeric microgels at ultrahigh densities
title_full_unstemmed	Interpenetration of polymeric microgels at ultrahigh densities
title_sort	interpenetration of polymeric microgels at ultrahigh densities
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e40e0616ef2447a9909ee1d294f3d7d9
work_keys_str_mv	AT pritismohanty interpenetrationofpolymericmicrogelsatultrahighdensities AT sofinojd interpenetrationofpolymericmicrogelsatultrahighdensities AT kittyvangruijthuijsen interpenetrationofpolymericmicrogelsatultrahighdensities AT jeromejcrassous interpenetrationofpolymericmicrogelsatultrahighdensities AT marcobiolsrabasa interpenetrationofpolymericmicrogelsatultrahighdensities AT ralfschweins interpenetrationofpolymericmicrogelsatultrahighdensities AT annastradner interpenetrationofpolymericmicrogelsatultrahighdensities AT peterschurtenberger interpenetrationofpolymericmicrogelsatultrahighdensities
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Interpenetration of polymeric microgels at ultrahigh densities

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