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This study introduces an artificial catalytic system that controls hydrogel assembly and disassembly using a chemical fuel. The fuel generation rate dictates material properties, allowing for programmable hydrogel reprogramming.

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Area of Science:

  • Supramolecular chemistry
  • Materials science
  • Chemical kinetics

Background:

  • Nature employs catalysis in non-equilibrium processes like actin and tubulin assembly/disassembly.
  • Enzymatic reactions such as methionine oxidation and guanosine triphosphate hydrolysis are key examples.

Purpose of the Study:

  • To present an artificial reaction cycle for controlling hydrogel assembly and disassembly.
  • To demonstrate how catalytic fuel generation influences material properties and kinetics.

Main Methods:

  • Development of an artificial reaction cycle driven by catalytically generated fuel from a pre-fuel.
  • Utilizing the reaction cycle to control the dis-assembly and re-assembly of a hydrogel.
  • Investigating the impact of pre-fuel turnover rate on hydrogel morphology and mechanical properties.

Main Results:

  • The artificial reaction cycle successfully controlled hydrogel dynamics.
  • Pre-fuel turnover rate was shown to dictate hydrogel morphology and mechanical characteristics.
  • Hydrogels were reprogrammed repeatedly by adding fresh fuel and removing waste.

Conclusions:

  • Catalytic fuel generation offers a method to control reaction/assembly kinetics in artificial systems.
  • This approach enables the dynamic control of material properties in non-equilibrium supramolecular systems.
  • The findings provide insights into creating life-like, responsive materials.