Incorporation of V(V) clusters into polymer hydrogels has been used to impart photoresponsive behavior and to tune materials properties during light irradiation. We have developed cellulose-agarose hydrogels that incorporate light responsive vanadium(V) moieties that are able to change the mechanical properties of the gels after light irradiation. The photoreaction was evidenced when the hydrogel turned from yellow to blue through a green intermediate. This color change was attributed to the reduction of V(V) to V(IV) as described in our previous work. A concomitant oxidative breakdown of the polysaccharide chain was noticeable upon the reduction of V(V). Just by controlling the exposure to light, mechanical properties of the matrix as well as the viscosity of the polysaccharide can be manipulated. Light can be used to create discrete patterns on these materials as gradients in elasticity. Scanning electron microscopy studies show the increase in pore sizes and guest cavity formation during irradiation. The gels are also able to encapsulate cargo, and deliver the cargo during light irradiation. By photo patterning, we can create distinct areas for controlled delivery and diverse mechanical properties within the same hydrogel. We now expect to develop and tune conductivity in these polysaccharide-based material with light responsive properties of vanadium at the molecular level.

Photofabricating the mechanical properties of vanadium(V)-polysaccharide coordination hydrogels for controlled delivery

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