Textile Sensor With Hydrophilic Gradient For Sweat Analysis
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Solution Overview
Problem
Existing clothing technologies fail to effectively monitor electrolyte and molecule levels in sweat in real time, leading to inaccurate measurements due to uncontrolled sweat accumulation and mixing.
Innovation Solution
A textile with integrated sensors that utilize a hydrophilic gradient to spontaneously absorb and control sweat flow, allowing for non-invasive, real-time analysis of analyte levels using conductive polymer fibers and selective membranes or enzymes, ensuring only fresh sweat is analyzed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sweat is allowed to accumulate in the textile for analysis, then there is sufficient sample volume for measurement, but the measurement accuracy deteriorates due to mixing of old and new sweat
Solution Approach 1:
The textile incorporates a hydrophilic gradient where different regions have different water absorption properties. The first region has higher hydrophilicity to absorb fresh sweat, while the second region has lower hydrophilicity to prevent mixing with accumulated sweat. This spatial variation in material properties enables selective sweat collection and maintains measurement accuracy by ensuring only fresh sweat reaches the sensor.
2Reliability
If direct skin contact sensors are used, then sweat can be collected immediately, but the system complexity and discomfort to the wearer increases
Solution Approach 1:
The sensing elements are integrated directly into the textile fibers themselves rather than being separate components. The conductive polymer-coated fibers serve dual purposes: they function as both the textile structure and the sensing element. This merging of sensing functionality into the fabric eliminates the need for separate sensor assemblies, reducing overall system complexity while maintaining reliable sweat collection through the natural hydrophilic properties of the fibers.
3Quantity of substance
If the textile absorbs all sweat uniformly, then maximum sample collection is achieved, but the ability to distinguish fresh from old sweat is lost
Solution Approach 1:
The textile employs a hydrophilic gradient creating distinct zones with different absorption characteristics. The first region exhibits high hydrophilicity to actively absorb and transport fresh sweat, while the second region has reduced hydrophilicity to act as a barrier preventing old sweat from mixing with the fresh sample. This spatial differentiation in absorption properties preserves sweat freshness information while maintaining adequate sample volume for analysis.
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
Enables continuous, accurate monitoring of hydration and nutrient levels by distinguishing fresh from old sweat, providing reliable physiological data without discomfort or inaccurate readings.
Implementation Method 1
positive ions in the sweat reversibly affect the conductivity of the conductive polymer in the functionalized fiber
Implementation Method 2
The textile is engineered to create a sweat flux to transport fresh sweat to the sensors for analysis
Data Source
AI summary
Embodiments of the invention disclosed herein are directed to articles of clothing that allow for monitoring of different analytes (e.g., electrolytes and molecules) in human sweat during fitness activity, while training, or simply in everyday life. The clothing includes a sensor system completely integrated in textile such that every sensing part is made of textile fibers. The clothing is able to control, collect, analyze, and expel the sweat over time. The textile sensor allows a spontaneous absorption of body sweat directly from the skin, while it is produced, using the hydrophilic natural properties of the textile. Then, once adsorbed, the flux of sweat is controlled and guided through the textile using a gradient of the textile's hydrophilic properties. The sweat guided through the textile is analyzed through an electrochemical sensor woven into the textile. Finally, the sweat is collected in a reservoir and expelled for evaporation.