Smart Hydrogel System

A special issue of Gels (ISSN 2310-2861).

Deadline for manuscript submissions: closed (28 January 2022) | Viewed by 2234

Special Issue Editor


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Guest Editor
UCD Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), Dublin, Ireland
Interests: hydrogel scaffolds; smart hydrogels; wound healing

Special Issue Information

Dear Colleagues,

Over the last decade, smart hydrogels have been extensively investigated for tissue engineering and regenerative medicine applications. With smart characteristics such as in situ crosslinking, multi-responsiveness, tunable stiffness, and a controllable degradation rate, this type of biomaterial can overcome the functional limitations of conventional hydrogel systems. An ideal smart hydrogel system can crosslink in situ after injection into the human body or can be delivered directly to the application site through a sol-to-gel transition. A biologically benign process is required to fabricate smart hydrogels for biomedical applications. Thus, reactions that can proceed under physiological conditions with high biocompatibility, such as Michael addition, click chemistry, Schiff base reaction, photo-crosslink reaction, and host–guest interaction are ideal for smart hydrogel fabrication. Moreover, multi-responsive properties under external stimuli including pH, thermo, light, shear force, and ionic strength are desired to be incorporated in the smart hydrogel system to meet a variety of application requirements. Development in this subject necessitates a continuous effort to achieve a more detailed understanding of complex smart hydrogel systems for real applications.

Dr. Sigen Asigen
Guest Editor

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Keywords

  • responsive hydrogels
  • methodology of smart hydrogel fabrication
  • evaluation of novel smart hydrogels
  • translational applications of smart hydrogels

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Published Papers (1 paper)

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Research

18 pages, 3107 KiB  
Article
Tandem Osmotic Engine Based on Hydrogel Particles with Antipolyelectrolyte and Polyelectrolyte Effect Fuelled by Both Salinity Gradient Modes
by Anjali Cheeramthodi Padmanabhan, Dong Suk Han, Sifani Zavahir, Jan Tkac and Peter Kasak
Gels 2021, 7(4), 232; https://doi.org/10.3390/gels7040232 - 25 Nov 2021
Viewed by 1877
Abstract
In this study, we propose a new approach to attain energy by salinity gradient engines with pistons based on hydrogels possessing polyelectrolyte and antipolyelectrolyte effects in a tandem arrangement, providing energy in each salinity gradient mode in a repeatable manner. The swelling of [...] Read more.
In this study, we propose a new approach to attain energy by salinity gradient engines with pistons based on hydrogels possessing polyelectrolyte and antipolyelectrolyte effects in a tandem arrangement, providing energy in each salinity gradient mode in a repeatable manner. The swelling of hydrogel with a polyelectrolyte effect and shrinking of hydrogel particles possessing an antipolyelectrolyte effect in desalinated water, and subsequent shrinking of hydrogel with polyelectrolyte and swelling of hydrogel antipolyelectrolyte effect in saline water, generate power in both increasing and decreasing salinity modes. To investigate the energy recovery, we scrutinized osmotic engine assemblies by a setup arrangement of pistons with hydrogel particles, with polyelectrolyte and antipolyelectrolyte effects, in tandem. The energy recovery from the tandem engine setup (calculated based on dry form for each polyelectrolyte polyacrylate-based hydrogel-SPA) and antipolyelectrolyte–sulfobetaine-based gel with methacrylate polymeric backbone-SBE) up to 581 J kg−1 and a mean power of 0.16 W kg−1 was obtained by the tandem setup of SPA and SBE hydrogel containing 3% crosslinking density and particle size of 500 microns with an external load of 3.0 kPa. Exchange of sulfobetaine with methacrylamide (SBAm), the main polymer backbone, revealed a positive increase in energy recovery of 670 J kg−1 with a mean power of 0.19 W kg−1 for the tandem system operating under the same parameters (SPA@SBAm). The energy recovery can be controlled, modulated and tuned by selecting both hydrogels with antipolyelectrolyte and polyelectrolyte effects and their performing parameters. This proof of concept provides blue energy harvesting by contributing both polyelectrolyte and antipolyelectrolyte effects in a single tandem setup; together with easy accessibility (diaper-based materials (SPA)) and known antibiofouling, these properties offer a robust alternative for energy harvesting. Full article
(This article belongs to the Special Issue Smart Hydrogel System)
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