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Creating Transient Gradients in Supramolecular Hydrogels.

Lisa Thomson¹, Ralf Schweins², Emily R Draper¹

¹School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, Scotland.

Macromolecular Rapid Communications

|April 17, 2020

Summary

Researchers created hydrogels with tunable stiffness gradients using a photoacid generator. This method allows for controlled gel properties, differing from standard homogeneous hydrogels, and enables patterned gel formation.

Keywords:

dipeptide gels patterning photoacids rheology

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Area of Science:

Materials Science
Supramolecular Chemistry
Soft Matter Physics

Background:

Low molecular weight gelators typically self-assemble into uniform, homogeneous hydrogels in aqueous solutions.
Homogeneous hydrogel properties are not always suitable for specific applications, necessitating methods for controlled heterogeneity.

Purpose of the Study:

To develop a method for creating hydrogels with transient stiffness gradients using a photoacid generator.
To investigate the structural basis of photoacid-induced hydrogels and compare them to conventionally triggered gels.
To explore the formation of patterned hydrogels with spatially controlled stiffness variations.

Main Methods:

Utilized a photoacid generator to induce localized pH changes and control gelation.
Employed cavitation rheology and bulk rheology to measure and confirm transient stiffness gradients.
Applied small-angle neutron scattering to elucidate the self-assembled fibrillar network structures.

Main Results:

Successfully formed hydrogels exhibiting transient gradients in stiffness through photoacid-induced pH changes.
Demonstrated that photoacid-generated gels share similar self-assembled structures with those formed by conventional pH triggers.
Achieved the formation of patterned hydrogels with localized, transient differences in mechanical properties.

Conclusions:

Photoacid generators offer a novel approach to control the spatial and temporal properties of hydrogel stiffness.
The findings provide a pathway for fabricating advanced soft materials with tunable mechanical landscapes.
This technique opens possibilities for creating complex hydrogel architectures for applications in tissue engineering and beyond.