Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid

The phase behaviour of soft colloids has attracted great attention due to the large variety of new phenomenologies emerging from their ability to pack at very high volume fractions. Here we report rheological measurements on interpenetrated polymer network microgels composed of poly(N-isopropylacryl...

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Autores principales: Franco, Silvia, Buratti, Elena, Nigro, Valentina, Zaccarelli, Emanuela, Ruzicka, Barbara, Angelini, Roberta
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8070831/
https://www.ncbi.nlm.nih.gov/pubmed/33919803
http://dx.doi.org/10.3390/ijms22084032
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author Franco, Silvia
Buratti, Elena
Nigro, Valentina
Zaccarelli, Emanuela
Ruzicka, Barbara
Angelini, Roberta
author_facet Franco, Silvia
Buratti, Elena
Nigro, Valentina
Zaccarelli, Emanuela
Ruzicka, Barbara
Angelini, Roberta
author_sort Franco, Silvia
collection PubMed
description The phase behaviour of soft colloids has attracted great attention due to the large variety of new phenomenologies emerging from their ability to pack at very high volume fractions. Here we report rheological measurements on interpenetrated polymer network microgels composed of poly(N-isopropylacrylamide) (PNIPAM) and polyacrylic acid (PAAc) at fixed PAAc content as a function of weight concentration. We found three different rheological regimes characteristic of three different states: a Newtonian shear-thinning fluid, an attractive glass characterized by a yield stress, and a jamming state. We discuss the possible molecular mechanisms driving the formation of these states.
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spelling pubmed-80708312021-04-26 Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid Franco, Silvia Buratti, Elena Nigro, Valentina Zaccarelli, Emanuela Ruzicka, Barbara Angelini, Roberta Int J Mol Sci Article The phase behaviour of soft colloids has attracted great attention due to the large variety of new phenomenologies emerging from their ability to pack at very high volume fractions. Here we report rheological measurements on interpenetrated polymer network microgels composed of poly(N-isopropylacrylamide) (PNIPAM) and polyacrylic acid (PAAc) at fixed PAAc content as a function of weight concentration. We found three different rheological regimes characteristic of three different states: a Newtonian shear-thinning fluid, an attractive glass characterized by a yield stress, and a jamming state. We discuss the possible molecular mechanisms driving the formation of these states. MDPI 2021-04-14 /pmc/articles/PMC8070831/ /pubmed/33919803 http://dx.doi.org/10.3390/ijms22084032 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Franco, Silvia
Buratti, Elena
Nigro, Valentina
Zaccarelli, Emanuela
Ruzicka, Barbara
Angelini, Roberta
Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title_full Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title_fullStr Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title_full_unstemmed Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title_short Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid
title_sort glass and jamming rheology in soft particles made of pnipam and polyacrylic acid
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8070831/
https://www.ncbi.nlm.nih.gov/pubmed/33919803
http://dx.doi.org/10.3390/ijms22084032
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