Electroconductive hydrogel and devices with conducting polymers assembled around a 3D nanofiber framework

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Solution Overview

Problem

Current electroconductive hydrogels face challenges in achieving high conductivity and mechanical robustness while maintaining porosity and water content, limiting their applications in flexible devices and solar desalination systems, where high electrical conductivity, mechanical strength, and salt tolerance are required.

Innovation Solution

The development of conductive nanofiber hydrogels with a hybrid assembly of polymeric nanofiber networks, where conducting polymers self-organize into highly connected 3D nanostructures assisted by aramid nanofibers, achieving ultralow electrical percolation thresholds and combining high conductivity with structural robustness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conducting polymers are randomly distributed in hydrogel matrix, then electrical conductivity is improved, but mechanical strength deteriorates

Engineering Contradiction:

Improveelectrical conductivityVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

Aramid nanofibers serve as an intermediary framework that mediates between conducting polymers and hydrogel matrix. The nanofibers provide a structural scaffold that maintains mechanical strength while organizing conducting polymers into continuous conductive networks, resolving the contradiction between electrical conductivity and mechanical strength

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite material system consisting of aramid nanofibers, conducting polymers, and hydrogel matrix. This multi-component composite structure allows each component to fulfill its specific function: aramid nanofibers for mechanical support, conducting polymers for electrical conductivity, and hydrogel for biocompatibility and porosity

Inventive Principle:

Principle #40Composite materials

2Reliability

If conducting polymers are aggregated by solvent treatment and dry annealing, then electrical conductivity is improved, but mechanical strength deteriorates

Engineering Contradiction:

Improveelectrical conductivityVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The aramid nanofiber network is pre-formed as a stable structural framework before conducting polymers are introduced. This preliminary structural preparation allows subsequent polymer aggregation processes to enhance conductivity without compromising the pre-established mechanical integrity of the hydrogel

Inventive Principle:

Principle #10Preliminary action

3Strength

If toughening components are incorporated into hydrogels, then mechanical strength is improved, but electrical conductivity deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidelectrical conductivity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The aramid nanofibers are distributed at specific locations within the hydrogel matrix to create localized conductive pathways. This spatial organization allows toughening components to be incorporated in the bulk matrix while maintaining electrical conductivity through the nanofiber network channels

Inventive Principle:

Principle #3Local quality

4Strength

If high solid content is used in nanofiber networks, then mechanical strength is improved, but porosity deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidporosity

Core Design Contradiction:

StrengthVSVolume of stationary object

Solution Approach 1:

The hydrogel structure is segmented into a hierarchical network of aramid nanofibers with controlled spacing and distribution. This segmentation creates a porous architecture where solid nanofibers provide strength while the inter-fiber spaces maintain porosity for ion transport and fluid permeability

Inventive Principle:

Principle #1Segmentation

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 resulting hydrogels exhibit exceptional mechanical strength, high conductivity, and stability, enabling their use in advanced bioelectronics and solar desalination systems with improved evaporation performance and salt resistance, while maintaining porosity and water content.

Implementation Method 1

conducting polymers self-organize into highly connected 3D nanostructures with an ultralow threshold for electrical percolation

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

conducting polymers self-organize into highly connected 3D nanostructures assisted by templating effects from aramid nanofibers

Methodology Applied

Scientific EffectSelf-assembly: Self-Assembly

Data Source

PatentUS20240263002A1Electroconductive hydrogel and devices with conducting polymers assembled around a 3D nanofiber framework

Publication Date: 2024.08.08 THE UNIVERSITY OF HONG KONG

AI summary

An electroconductive hydrogel is formed by hybrid assembly of polymeric nanofiber networks of conducting polymers that self-organize into highly connected 3D nanostructures with an ultralow threshold (˜1 wt %) for electrical percolation. A method for forming the electroconductive hydrogel comprises the steps of: dispersing aramid nanofibers (ANFs) in dimethyl sulfoxide (DMSO); conducting a solvent exchange with water to generate hydrogels with connective 3D fibrillar networks that serve as templates for the assembly of conducting polymers; incorporating polyvinyl alcohol (PVA) during the processing of the hydrogels to weld the fibrillar joints via hydrogen bonding; infiltrating monomers into the nano-porous hydrogels in an aqueous media; and polymerizing the hydrogels with added oxidants.