Conductive Hydrogel via Partial DOPA Oxidation
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Solution Overview
Problem
Conventional mussel adhesive protein-based hydrogels face limitations in achieving adhesive strength on desired surfaces due to the oxidation of DOPA residues during crosslinking processes, which reduces their adhesive properties.
Innovation Solution
A conductive hydrogel is developed by incorporating a mussel adhesive protein, liquid metal nanoparticles coated with hyaluronic acid, and applying electrical stimulation to form a coacervate-based hydrogel, which maintains adhesive strength and conductivity without additional adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If complete oxidative crosslinking of DOPA is performed, then hydrogel formation is achieved, but adhesive strength is completely lost
Solution Approach 1:
The patent applies partial oxidation crosslinking instead of complete oxidative crosslinking. By controlling the oxidation process to only partially oxidize DOPA residues, the hydrogel achieves sufficient structural formation while preserving enough unreduced DOPA groups to maintain adhesive strength on metal and tissue surfaces.
Solution Approach 2:
The patent changes the oxidation parameter from complete oxidation to partial oxidation. This parameter change allows the system to achieve hydrogel formation without completely sacrificing the adhesive functionality of DOPA residues, resolving the contradiction between structural stability and adhesive strength.
2Stability of the object's composition
If crosslinking through iron ions is performed, then hydrogel formation is achieved, but adhesive strength is remarkably reduced
Solution Approach 1:
The patent extracts and eliminates iron ions from the crosslinking process. By removing this harmful crosslinking agent that consumes DOPA residues and reduces adhesion, the hydrogel can form through alternative mechanisms while preserving the adhesive functionality of DOPA groups.
Solution Approach 2:
The patent introduces alternative crosslinking mechanisms that do not consume DOPA residues. These intermediary crosslinking methods allow hydrogel formation without the harmful side effect of DOPA consumption that occurs with iron ion crosslinking.
3Stability of the object's composition
If DOPA residues are oxidized for crosslinking, then hydrogel structure is formed, but adhesive functionality is lost
Solution Approach 1:
The patent applies partial oxidation to achieve hydrogel structure formation while deliberately leaving sufficient DOPA residues unoxidized to maintain adhesive functionality. This partial action resolves the contradiction between structural formation and functional preservation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hydrogel exhibits excellent adhesive strength and conductivity, enabling applications in wearable electronics, artificial skin, supercapacitors, and biomedical devices without the need for additional adhesives, while maintaining mechanical strength and biocompatibility.
Implementation Method 1
DOPA residues, which form hydrogen bonds or covalent bonds with nucleophiles such as amine groups, thiol groups, and hydroxyl groups on the surface of tissues to enable surface adhesion
Implementation Method 2
DOPA residues, which form hydrogen bonds or covalent bonds with nucleophiles
Implementation Method 3
These DOPA residues form metal-catechol complexes with metal elements to show excellent adhesive strength even on metal surfaces
Implementation Method 4
hydrogeling a composition for preparing a hydrogel containing a conductive substance using electrical oxidation
Implementation Method 5
a conductive hydrogel including a mussel adhesive protein, a liquid metal and hyaluronic acid
Data Source
AI summary
The present disclosure relates to a conductive hydrogel including a mussel adhesive protein, a liquid metal, and hyaluronic acid and a preparation method thereof.