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Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour
The peculiar linear temperature-dependent swelling of core-shell microgels has been conjectured to be linked to the core-shell architecture combining materials of different transition temperatures. Here the structure of pNIPMAM-core and pNNPAM-shell microgels in water is studied as a function of tem...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6761195/ https://www.ncbi.nlm.nih.gov/pubmed/31554839 http://dx.doi.org/10.1038/s41598-019-50164-6 |
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author | Cors, Marian Wrede, Oliver Wiehemeier, Lars Feoktystov, Artem Cousin, Fabrice Hellweg, Thomas Oberdisse, Julian |
author_facet | Cors, Marian Wrede, Oliver Wiehemeier, Lars Feoktystov, Artem Cousin, Fabrice Hellweg, Thomas Oberdisse, Julian |
author_sort | Cors, Marian |
collection | PubMed |
description | The peculiar linear temperature-dependent swelling of core-shell microgels has been conjectured to be linked to the core-shell architecture combining materials of different transition temperatures. Here the structure of pNIPMAM-core and pNNPAM-shell microgels in water is studied as a function of temperature using small-angle neutron scattering with selective deuteration. Photon correlation spectroscopy is used to scrutinize the swelling behaviour of the colloidal particles and reveals linear swelling. Moreover, these experiments are also employed to check the influence of deuteration on swelling. Using a form-free multi-shell reverse Monte Carlo approach, the small-angle scattering data are converted into radial monomer density profiles. The comparison of ‘core-only’ particles consisting of identical cores to fully hydrogenated core-shell microgels, and finally to H-core/D-shell architectures unambiguously shows that core and shell monomers display gradient profiles with strong interpenetration, leading to cores embedded in shells which are bigger than their isolated ‘core-only’ precursor particles. This surprising result is further generalized to different core cross-linker contents, for temperature ranges encompassing both transitions. Our analysis demonstrates that the internal structure of pNIPMAM-core and pNNPAM-shell microgels is heterogeneous and strongly interpenetrated, presumably allowing only progressive core swelling at temperatures intermediate to both transition temperatures, thus promoting linear swelling behaviour. |
format | Online Article Text |
id | pubmed-6761195 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-67611952019-11-12 Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour Cors, Marian Wrede, Oliver Wiehemeier, Lars Feoktystov, Artem Cousin, Fabrice Hellweg, Thomas Oberdisse, Julian Sci Rep Article The peculiar linear temperature-dependent swelling of core-shell microgels has been conjectured to be linked to the core-shell architecture combining materials of different transition temperatures. Here the structure of pNIPMAM-core and pNNPAM-shell microgels in water is studied as a function of temperature using small-angle neutron scattering with selective deuteration. Photon correlation spectroscopy is used to scrutinize the swelling behaviour of the colloidal particles and reveals linear swelling. Moreover, these experiments are also employed to check the influence of deuteration on swelling. Using a form-free multi-shell reverse Monte Carlo approach, the small-angle scattering data are converted into radial monomer density profiles. The comparison of ‘core-only’ particles consisting of identical cores to fully hydrogenated core-shell microgels, and finally to H-core/D-shell architectures unambiguously shows that core and shell monomers display gradient profiles with strong interpenetration, leading to cores embedded in shells which are bigger than their isolated ‘core-only’ precursor particles. This surprising result is further generalized to different core cross-linker contents, for temperature ranges encompassing both transitions. Our analysis demonstrates that the internal structure of pNIPMAM-core and pNNPAM-shell microgels is heterogeneous and strongly interpenetrated, presumably allowing only progressive core swelling at temperatures intermediate to both transition temperatures, thus promoting linear swelling behaviour. Nature Publishing Group UK 2019-09-25 /pmc/articles/PMC6761195/ /pubmed/31554839 http://dx.doi.org/10.1038/s41598-019-50164-6 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Cors, Marian Wrede, Oliver Wiehemeier, Lars Feoktystov, Artem Cousin, Fabrice Hellweg, Thomas Oberdisse, Julian Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title | Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title_full | Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title_fullStr | Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title_full_unstemmed | Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title_short | Spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
title_sort | spatial distribution of core monomers in acrylamide-based core-shell microgels with linear swelling behaviour |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6761195/ https://www.ncbi.nlm.nih.gov/pubmed/31554839 http://dx.doi.org/10.1038/s41598-019-50164-6 |
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