pH-Sensitive Polymeric Sensor with Conductive Particulates
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Solution Overview
Problem
There is a need for low-cost, simple environmental sensors that can be remotely interrogated to provide information on environmental changes such as pH, humidity, and mechanical strain, which are not efficiently addressed by existing sensing systems that require expensive hardware.
Innovation Solution
A sensor system utilizing a pH-sensitive, switchable polymeric element with conductive particulates embedded in a polymeric matrix that changes electrical states in response to predefined environmental changes, allowing for volumetric and conductivity hysteresis, enabling the detection of pH, humidity, and mechanical strain through changes in electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensing systems are used to detect environmental changes, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex electronic sensing hardware with a passive polymeric sensor system that uses inherent material properties (volumetric change, conductivity change, color change) to detect environmental conditions. The polymeric element responds directly to pH changes through chemical-physical mechanisms rather than requiring active electronic components.
Solution Approach 2:
The patent utilizes changes in physical parameters of the polymeric material (volume, electrical conductivity, optical properties) in response to environmental pH changes. These parameter changes provide the sensing mechanism without requiring complex measurement hardware.
2Measurement precision
If traditional sensing systems are used to detect environmental changes, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent employs inexpensive polymeric materials and conductive particulates that can be manufactured at low cost. The sensor system is designed to be disposable or single-use, eliminating the need for expensive, maintainable electronic sensing hardware while providing sufficient measurement capability for the application.
Solution Approach 2:
The patent creates a composite material system combining polymeric matrix with conductive particulates (such as carbon black or metal particles). This composite approach enables cost-effective manufacturing while achieving the necessary sensing functionality through the interaction between the polymeric component and conductive filler.
3Measurement precision
If complex hardware is used for sensor interrogation, then measurement precision is improved, but ease of operation worsens
Solution Approach 1:
The polymeric sensor system is self-sensing and self-reporting. The material inherently changes its physical properties (conductivity, volume, color) in response to environmental conditions, eliminating the need for complex external interrogation hardware. The sensor performs its own measurement function through its material response.
Solution Approach 2:
The patent utilizes optical property changes (color changes) of the polymeric material as a direct visual indicator of environmental conditions. This provides an intuitive, easy-to-operate sensing mechanism that does not require complex electronic interrogation systems.
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 sensor system effectively provides a low-cost, efficient means to detect environmental changes by switching between electrical states in response to pH, humidity, and mechanical strain, allowing for remote interrogation and indication of environmental conditions.
Implementation Method 1
The polymeric matrix may undergo a volumetric change in response to a change in environmental pH
Implementation Method 2
A sensor system undergoes a volumetric and conductivity hysteresis associated with exposure to environmental changes of particular pH values
Data Source
AI summary
A sensor comprises: an electrically comprises a switchable polymeric element. The polymeric element has at least a first electrical state and a second electrical state and is switchable between the first and second electrical states as a function of predefined environmental pH changes.The sensor comprises a pH sensitive polymeric matrix and a plurality of conductive particles embedded in the polymeric matrix.