Hydrogel Sensor Assembly with Porous Support
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Solution Overview
Problem
Hydrogel sensor devices face challenges in achieving fast response times and high mechanical stability while maintaining significant volume changes, as smaller initial volumes are diffusion-limited and larger volumes result in slower responses, making it difficult to meet the requirements for many sensor applications.
Innovation Solution
The development of hydrogel sensor devices that include a crosslinked hydrogel body with good mechanical stability, supported by a structure that allows for fast response times and high response magnitudes, featuring a crosslinked hydrogel body that changes volume in response to environmental stimuli, supported by a mechanical structure and equipped with sensors to detect these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the initial volume of the hydrogel body is reduced to achieve fast response times, then the response time is improved, but the mechanical stability deteriorates
Solution Approach 1:
The patent employs a composite structure combining a hydrogel body with a porous support structure. The hydrogel provides stimulus-responsive volume change while the porous support (made of materials like metal, ceramic, or polymer) provides mechanical stability. This composite approach allows the system to achieve both fast response times and high mechanical stability simultaneously.
Solution Approach 2:
The support structure is designed with specific local properties including porosity (30-80%), surface area (10-1000 m²/g), and pore size (0.01-100 μm) to provide mechanical support precisely where needed while allowing the hydrogel to expand and contract freely. This localized structural quality enables the hydrogel to maintain mechanical stability during volume changes.
2Quantity of substance
If the initial volume of the hydrogel body is increased to achieve high response magnitude, then the response magnitude is improved, but the response time deteriorates
Solution Approach 1:
The patent segments the hydrogel into multiple separate bodies (first hydrogel body, second hydrogel body, etc.) that can respond independently. Each hydrogel body maintains a high surface area to volume ratio, enabling fast diffusion and rapid response times while collectively providing significant response magnitude through the combined effect of multiple segments.
Solution Approach 2:
The patent transitions from a single large hydrogel body to multiple smaller hydrogel bodies arranged in a three-dimensional configuration around the porous support. This dimensional reconfiguration increases the total surface area for stimulus exposure while reducing the diffusion path length within each individual hydrogel body, achieving both high response magnitude and fast response time.
3Speed
If the surface area to volume ratio of the hydrogel body is increased to improve response speed, then the response time is improved, but the mechanical stability deteriorates
Solution Approach 1:
The porous support structure serves as an intermediary between the hydrogel bodies and the external environment. It provides a stable mechanical framework that holds the high surface area to volume ratio hydrogel bodies in place, enabling fast response times through increased surface area exposure while maintaining mechanical stability through the support structure's structural integrity.
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 solution enables hydrogel sensor devices to achieve fast response times and high mechanical stability, allowing for effective detection of environmental stimuli, thereby addressing the limitations of previous hydrogel sensor technologies.
Implementation Method 1
stimulus-responsive hydrogels can allow for high levels of control over material properties in response to external stimuli... The response of the stimulus-responsive hydrogel to an environmental stimulus can be in the form of a change in refractive index, change in elastic modulus, change in color, etc.
Data Source
AI summary
A hydrogel sensor device can include a crosslinked hydrogel body which changes in volume in response to an environmental stimulus, a support post positioned to mechanically support the crosslinked hydrogel body during the change in volume, and a sensor positioned to detect the change in volume in the crosslinked hydrogel body.