4.8 Article

Photo-degradable, tough and highly stretchable hydrogels

期刊

MATERIALS TODAY BIO
卷 15, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.mtbio.2022.100325

关键词

Hydrogel; Double-network; Tough; Stretchable light-degradable; o-nitrobenzyl

资金

  1. FCT [SFRH/BD/133040/2017]
  2. FEDER funds through the program COMPETE - Programa Operacional Factores de Competitividade
  3. national funds through FCT - Fundacao para a Ciencia e a Tecnologia [UID/EMS/00285/2020]
  4. FEDER [MATIS -CENTRO-01-0145-FEDER-000014]
  5. FEDER - European Regional Fund through the COMPETE Programme (Operational Programme for Competitiveness)
  6. National Funds through FCT-Fundacao para a Ciencia e a Tecnologia (Portuguese Foundation for Science and Technology) [REEQ/481/QUI/2006-RECI/QEQ-QFI/0168/ 2012, CENTRO-07-CT62-FEDER-002012]
  7. Rede Nacional de Ressonancia Magnetica Nuclear (RNRRMN)
  8. Fundação para a Ciência e a Tecnologia [SFRH/BD/133040/2017] Funding Source: FCT

向作者/读者索取更多资源

This study presents highly stretchable and tough hydrogels with controlled light-triggered photo-degradation for the first time. The hydrogels are formed by a double-network structure with covalently and ionically crosslinked subnetworks. By using a novel crosslinker, the mechanical properties of the hydrogel were not affected. The hydrogels show potential applications in health, electronics, and energy due to their excellent mechanical properties and controlled degradation.
We present for the first time highly stretchable and tough hydrogels with controlled light-triggered photo -degradation. A double-network of alginate/polyacrylamide (PAAm) is formed by using covalently and ionically crosslinked subnetworks. The ionic Ca2+ alginate interpenetrates a PAAm network covalently crosslinked by a bifunctional acrylic crosslinker containing the photodegradable o-nitrobenzyl (ONB) core instead of the commonly used methylene bisacrylamide (MBAA). Remarkably, due to the developed protocol, the change of the crosslinker did not affect the hydrogel's mechanical properties. The incorporation of photosensitive components in hydrogels allows external temporal control of their properties and tuneable degradation. Cell viability and cell proliferation assays revealed that hydrogels and their photodegradation products are not cytotoxic to the NIH3T3 cell line. In one example of application, we used these hydrogels for bio-potential acquisition in wearable electrocardiography. Surprisingly, these hydrogels showed a lower skin-electrode impedance, compared to the common medical grade Ag/AgCl electrodes. This work lays the foundation for the next generation of tough and highly stretchable hydrogels that are environmentally friendly and can find applications in a variety of fields such as health, electronics, and energy, as they combine excellent mechanical properties with controlled degradation.

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