Interdigitated Liquid-Metal Fiber Sensor for Flexible Capacitance
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Solution Overview
Problem
Conventional capacitive sensors are rigid and lack flexibility, which limits their applicability in miniaturized and lightweight electronic devices requiring high power density and efficiency.
Innovation Solution
A composite fiber structure is developed, comprising a hollow fiber filled with liquid metal and a metal wire, arranged in an interdigitated configuration, maintaining flexibility and conductivity, allowing for capacitive sensing through changes in capacitance upon contact with a human body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capacitive sensors are made of rigid substrate or metal material, then conductivity is maintained, but flexibility is lost
Solution Approach 1:
The patent uses a composite structure consisting of a hollow fiber (providing flexibility) filled with liquid metal (providing conductivity). This composite material approach allows the sensor to simultaneously achieve both flexibility and conductivity, resolving the technical contradiction between these two properties.
Solution Approach 2:
The patent changes the physical state of the conductive material from solid (rigid) to liquid (flexible). By using liquid metal instead of solid metal, the sensor maintains conductivity while gaining flexibility, allowing it to adapt to deformation and bending without losing its conductive properties.
2Adaptability or versatility
If fiber structure is used to improve flexibility, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The sensor is divided into multiple identical composite fiber units, each with the same simple structure of hollow fiber filled with liquid metal. This segmentation allows the complex flexible sensor to be constructed from many simple, identical modules, reducing overall manufacturing complexity while maintaining flexibility.
Solution Approach 2:
The liquid metal is nested inside the hollow fiber, creating a compact composite structure. This nesting approach simplifies manufacturing by eliminating the need for separate assembly steps for the conductive element and flexible substrate, as the liquid metal is simply injected into the pre-formed hollow fiber.
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 composite fiber structure provides flexible and responsive capacitive sensing, enabling capacitive sensors to maintain performance even under deformation and allowing adjustment of capacitance values based on the number of fibers.
Implementation Method 1
a liquid metal injected into an inner space of the hollow fiber
Implementation Method 2
a capacitive sensor having a high power density and high-efficiency charge/discharge rate characteristics
Data Source
AI summary
A composite fiber structure with improved flexibility and responsiveness, and a method for manufacturing the same, and more particularly, through an interdigitated structure of composite fibers into which a liquid metal is injected, it is possible to have flexibility and fast responsiveness at the same time.