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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2021
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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) |
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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 |