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

doi:10.3390/ijms22084032

Open AccessArticle

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

by

Silvia Franco

^1,2

,

Elena Buratti

²

,

Valentina Nigro

^2,3

,

Emanuela Zaccarelli

^2,4

,

Barbara Ruzicka

^2,4,*

and

Roberta Angelini

^2,4,*

¹

Dipartimento di Scienze di Base e Applicate per l’Ingegneria (SBAI), Sapienza Università di Roma, 00185 Roma, Italy

²

Istituto dei Sistemi Complessi del Consiglio Nazionale delle Ricerche (ISC-CNR), Sede Sapienza, 00185 Roma, Italy

³

ENEA Centro Ricerche Frascati, FSN-TECFIS-MNF Photonics Micro and Nanostructures Laboratory, 00044 Frascati, Rome, Italy

⁴

Dipartimento di Fisica, Sapienza Università di Roma, 00185 Roma, Italy

^*

Authors to whom correspondence should be addressed.

Int. J. Mol. Sci. 2021, 22(8), 4032; https://doi.org/10.3390/ijms22084032

Submission received: 15 March 2021 / Revised: 31 March 2021 / Accepted: 1 April 2021 / Published: 14 April 2021

(This article belongs to the Special Issue From Molecules to Colloids: Recent Advances in Their Chemical Physics)

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Abstract

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.

Keywords: rheology; microgel; shear-thinning; glass; jamming; soft colloids; PNIPAM

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MDPI and ACS Style

Franco, S.; Buratti, E.; Nigro, V.; Zaccarelli, E.; Ruzicka, B.; Angelini, R. Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid. Int. J. Mol. Sci. 2021, 22, 4032. https://doi.org/10.3390/ijms22084032

AMA Style

Franco S, Buratti E, Nigro V, Zaccarelli E, Ruzicka B, Angelini R. Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid. International Journal of Molecular Sciences. 2021; 22(8):4032. https://doi.org/10.3390/ijms22084032

Chicago/Turabian Style

Franco, Silvia, Elena Buratti, Valentina Nigro, Emanuela Zaccarelli, Barbara Ruzicka, and Roberta Angelini. 2021. "Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid" International Journal of Molecular Sciences 22, no. 8: 4032. https://doi.org/10.3390/ijms22084032

APA Style

Franco, S., Buratti, E., Nigro, V., Zaccarelli, E., Ruzicka, B., & Angelini, R. (2021). Glass and Jamming Rheology in Soft Particles Made of PNIPAM and Polyacrylic Acid. International Journal of Molecular Sciences, 22(8), 4032. https://doi.org/10.3390/ijms22084032

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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

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