Stiffness-switchable DNA-based constitutional dynamic network hydrogels for self-healing and matrix-guided controlled...

Area of Science:

• Supramolecular Chemistry
• Materials Science

Background:

• Constitutional dynamic networks (CDNs) are signal-triggered reconfigurable systems inspired by natural networks.
• Controlling material properties with CDNs remains a significant challenge in materials science.

Purpose of the Study:

• To design and characterize a novel CDN system for tunable hydrogel stiffness.
• To explore the potential of these hydrogels in self-healing, drug delivery, and biocatalysis.

Main Methods:

• Designed a CDN with four toehold-modified constituents: two bidentate (chain-elongating) and two tetradentate (crosslinking) units.
• Utilized auxiliary and orthogonal effectors to stabilize specific CDN components.
• Investigated hydrogel stiffness modulation through effector-induced stabilization.

Main Results:

• Achieved tunable hydrogel stiffness (low, medium, high) by controlling the balance of bidentate and tetradentate units.
• Demonstrated reversible switching between stiffness states using counter effectors.
• Successfully developed self-healing matrices, controlled drug-release systems, and functional materials for biocatalytic cascades.

Conclusions:

• The developed CDN hydrogels offer unprecedented control over material properties through dynamic network reconfiguration.
• These tunable hydrogels show significant promise for advanced applications in regenerative medicine and functional materials.