Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties

Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanica...

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Autores principales:	Beata Strachota, Adam Strachota, Sabina Horodecka, Miroslav Šlouf, Jiří Dybal
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Poly(N-isopropylacrylamide) Clay Nanocomposite Hydrogels Temperature-responsive pH-responsive Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf9
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spelling	oai:doaj.org-article:c066231b15d242d5ae12fe36829c8cf92021-11-28T04:32:35ZMonolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties2238-785410.1016/j.jmrt.2021.11.018https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf92021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421012977https://doaj.org/toc/2238-7854Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanical, and self–recovery properties. The presented materials might be of interest as actuators, drug- or reagent-release systems. They are based on poly(N-isopropylacrylamide) (PNIPAm) physically crosslinked by clay nanoplatelets. This crosslinking lends the gels their unique mechanical properties, PNIPAm a distinct T responsiveness, and the sodium methacrylate (SMA) co-monomer (just 1.5 mol%) a strong pH-responsiveness. The gels display a quasi-one-way and complex response to T- and pH-stimuli: very fast deswelling and slow re-swelling. Extremely fast, as for monolithic gels, is the T induced deswelling at pH2: ca. 10 min are needed for the whole process. This rapid kinetics is attributed to micro-phase-separation which does not destroy mechanical properties. Re-swelling of the gels is always slow: more than 2 days are needed for 35% completion of the process in case of gels shrunken in the neutral bath. In case of gels shrunken in acidic conditions, simple re-swelling is practically blocked (due to the micro-phase-separation): both cooling and pH reversal is needed for ‘un-blocking’ and re-swelling.Beata StrachotaAdam StrachotaSabina HorodeckaMiroslav ŠloufJiří DybalElsevierarticlePoly(N-isopropylacrylamide)ClayNanocompositeHydrogelsTemperature-responsivepH-responsiveMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6079-6097 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Poly(N-isopropylacrylamide) Clay Nanocomposite Hydrogels Temperature-responsive pH-responsive Mining engineering. Metallurgy TN1-997
spellingShingle	Poly(N-isopropylacrylamide) Clay Nanocomposite Hydrogels Temperature-responsive pH-responsive Mining engineering. Metallurgy TN1-997 Beata Strachota Adam Strachota Sabina Horodecka Miroslav Šlouf Jiří Dybal Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
description	Monolithic (non-porous) nanocomposite hydrogels were synthesized, with double and ultra-fast stimuli-responsiveness to temperature (T) and to pH. Such a fast stimulus-response is exceptional in case of bulk gels, and the prepared hydrogels additionally possess extraordinarily high tensile, mechanical, and self–recovery properties. The presented materials might be of interest as actuators, drug- or reagent-release systems. They are based on poly(N-isopropylacrylamide) (PNIPAm) physically crosslinked by clay nanoplatelets. This crosslinking lends the gels their unique mechanical properties, PNIPAm a distinct T responsiveness, and the sodium methacrylate (SMA) co-monomer (just 1.5 mol%) a strong pH-responsiveness. The gels display a quasi-one-way and complex response to T- and pH-stimuli: very fast deswelling and slow re-swelling. Extremely fast, as for monolithic gels, is the T induced deswelling at pH2: ca. 10 min are needed for the whole process. This rapid kinetics is attributed to micro-phase-separation which does not destroy mechanical properties. Re-swelling of the gels is always slow: more than 2 days are needed for 35% completion of the process in case of gels shrunken in the neutral bath. In case of gels shrunken in acidic conditions, simple re-swelling is practically blocked (due to the micro-phase-separation): both cooling and pH reversal is needed for ‘un-blocking’ and re-swelling.
format	article
author	Beata Strachota Adam Strachota Sabina Horodecka Miroslav Šlouf Jiří Dybal
author_facet	Beata Strachota Adam Strachota Sabina Horodecka Miroslav Šlouf Jiří Dybal
author_sort	Beata Strachota
title	Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_short	Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_full	Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_fullStr	Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_full_unstemmed	Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties
title_sort	monolithic nanocomposite hydrogels with fast dual t- and ph- stimuli responsiveness combined with high mechanical properties
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c066231b15d242d5ae12fe36829c8cf9
work_keys_str_mv	AT beatastrachota monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties AT adamstrachota monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties AT sabinahorodecka monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties AT miroslavslouf monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties AT jiridybal monolithicnanocompositehydrogelswithfastdualtandphstimuliresponsivenesscombinedwithhighmechanicalproperties
_version_	1718408342523609088

Monolithic nanocomposite hydrogels with fast dual T- and pH- stimuli responsiveness combined with high mechanical properties

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