Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Sitao Wang
  • Chen Jiao
  • Gerald Gerlach
  • Julia Körner

Externe Organisationen

  • Technische Universität Dresden
  • Leibniz-Institut für Polymerforschung Dresden e.V.
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)2715-2727
Seitenumfang13
FachzeitschriftBIOMACROMOLECULES
Jahrgang25
Ausgabenummer5
Frühes Online-Datum4 Dez. 2023
PublikationsstatusVeröffentlicht - 13 Mai 2024

Abstract

A recent study unveiled the potential of acrylamide-based stimulus-responsive hydrogels for volatile organic compound detection in gaseous environments. However, for gas sensing, a large surface area, that is, a highly porous material, offering many adsorption sites is crucial. The large humidity variation in the gaseous environment constitutes a significant challenge for preserving an initially porous structure, as the pores tend to be unstable and irreversibly collapse. Therefore, the present investigation focuses on enhancing the porosity of smart PNiPAAm hydrogels under the conditions of a gaseous environment and the preservation of the structural integrity for long-term use. We have studied the influence of polyethylene glycol (PEG) as a porogen and the application of different drying methods and posttreatment. The investigations lead to the conclusion that only the combination of PEG addition, freeze-drying, and subsequent conditioning in high relative humidity enables a long-term stable formation of a porous surface and inner structure of the material. The significantly enhanced swelling response in a gaseous environment and in the test gas acetone is confirmed by gravimetric experiments of bulk samples and continuous measurements of thin films on piezoresistive pressure sensor chips. These measurements are furthermore complemented by an in-depth analysis of the morphology and microstructure. While the study was conducted for PNiPAAm, the insights and developed processes are general in nature and can be applied for porosity engineering of other smart hydrogel materials for VOC detection in gaseous environments.

ASJC Scopus Sachgebiete

Zitieren

Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing. / Wang, Sitao; Jiao, Chen; Gerlach, Gerald et al.
in: BIOMACROMOLECULES, Jahrgang 25, Nr. 5, 13.05.2024, S. 2715-2727.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Wang S, Jiao C, Gerlach G, Körner J. Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing. BIOMACROMOLECULES. 2024 Mai 13;25(5):2715-2727. Epub 2023 Dez 4. doi: 10.1021/acs.biomac.3c00738
Wang, Sitao ; Jiao, Chen ; Gerlach, Gerald et al. / Porosity Engineering of Dried Smart Poly(N-isopropylacrylamide) Hydrogels for Gas Sensing. in: BIOMACROMOLECULES. 2024 ; Jahrgang 25, Nr. 5. S. 2715-2727.
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