Photopatterning the Mechanical Properties of Polysaccharide-Containing Gels Using Fe³⁺ coordination

Abstract

Figure 1. Photoresponsive Fe(III)−Paam−UCPS hydrogels. The changes in mechanical properties can be easily illustrated by placing a 1 g weight on the hydrogel film before and after irradiation under 405 nm light (145 mW/cm 2 ). The dimensions of the original film were 1.5 cm × 2.3 cm × 0.3 cm.

Recent Advances in Metal‐Containing Polymer Hydrogels

“…[9b,c] Similar iron(III) cross-linked alginate hydrogels were also reported by Melman and co-workers. [9d] Recently, Zhang and co-workers reported metal ion cross-linked alginate hydrogels that can be served as shapeable and versatile templates for insitu metal–organic framework (MOF) growth, and the shapes of hydrogels were easily inherited by their corresponding MOF–alginate composites. [10] …”

“…[9] Anionic alginate solution can generate hydrogels by using metal cations (Fe 3+ , Ca 2+ , Sr 2+ , Ba 2+ ) as crosslinking agents, which can facilitate coordination with carboxylate groups of alginate. It should be pointed out that the G (guluronic acid) blocks in various alginate chains establish crosslinks through metal coordination, leading to a metal-alginate hydrogel (Figure 1).…”

“…[9a] Ostrowski and co-workers showed that light-responsive hydrogels can be prepared by the coordination of iron(III) and ionic polysaccharides. The physical state of these hydrogels can be changed under light stimuli due to the redox activity of polyvalent metal ions.…”

“…[33] Using the DN concept, Suo and coworkers synthesized extremely stretch-able and tough hydrogels by mixing two types of crosslinked polymers: [9e] one polymer network is calcium crosslinked alginate; the other is covalently crosslinked polyacrylamide with N, N -methylenebisacrylamide as the crosslinker. The calcium-containing hydrogels, with a water content of 90%, can be stretched beyond 20 times of their initial length, and have fracture energies of 9000 J m −2 .…”

Stimuliresponsive, auf Biomolekülen basierende Hydrogele und ihre Anwendungen

“…Die lichtinduzierte Steuerung der Steifigkeit oder Elastizität verschiedener Hydrogele auf Polysaccharidbasis, die durch Metallionen vernetzt waren, wurde demonstriert . So waren Hydrogele aus unterschiedlichen Polyuronsäuren durch Fe 3+ ‐Ionen vernetzt.…”