Programming Hydrogels with Complex Transient Behaviors via Autocatalytic Cascade Reactions
Jingyi Zhang1, Jian Liu1, Huizeng Li2,3
1School of Physical Science and Technology, ShanghaiTech University, 201210 Shanghai, P. R. China.
ACS Applied Materials & Interfaces
|April 19, 2022
Summary
Researchers developed novel synthetic polymer hydrogels using chemical reaction networks (CRNs). These life-like materials exhibit tunable, fuel-driven transitions between different states, paving the way for adaptive materials.
Area of Science:
- Materials Science
- Chemical Engineering
- Synthetic Biology
Background:
- Designing synthetic systems with life-like properties, such as autoevolution and transient behaviors, remains a significant challenge.
- Existing chemical reaction networks (CRNs) often lack the complexity to mimic dynamic biological processes.
Purpose of the Study:
- To develop a new class of polymer hydrogels that exhibit both autoevolutionary and fuel-driven transient behaviors.
- To construct life-like systems using a combination of autocatalytic cascade and fuel-driven reaction networks.
Main Methods:
- Utilized a CRN initiated by 4-arm-PEG-SH thiol and thiuram disulfides.
- Investigated thiol oxidation (k1), disulfide metathesis (k2), and thionate hydrolysis-coupling reactions (k3).
- Employed thiuram disulfides as a fuel to drive repeated reaction cycles and dissipative structures.
Main Results:
- Achieved a four-state autonomous transition: sol(I) → soft gel → sol(II) → stiff gel.
- Demonstrated fuel-driven cycles of stiff gel → sol(II) → stiff gel.
- Showed that transient state behavior and lifetime are tunable via thiuram disulfide concentration, pH, and thiuram structure.
Conclusions:
- Successfully designed life-like polymer hydrogels with predictable, autonomous, and fuel-driven transient behaviors.
- The developed CRN strategy offers a pathway for molecular design of autonomous and adaptive materials.
- Potential applications span various fields requiring dynamic and responsive material systems.
