Porous Polymer Matrix Composite Sensor Strips
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Solution Overview
Problem
Current methods for detecting analytes such as proteins, bacteria, or gases require specialized equipment and skilled users, and existing colorimetric sensors are limited by high costs, complexity, and inability to detect dilute analytes quickly and inexpensively.
Innovation Solution
A polymer matrix composite comprising a porous polymeric network structure with indicator particles that provide a detectable change in optical, UV, IR, mechanical, chemical, or electrical properties, achieved through high particle loadings and phase separation methods, allowing for rapid, inexpensive, and simple detection of analytes without the need for expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If specialized equipment and skilled users are used for analyte detection, then detection accuracy and reliability are improved, but cost and device complexity increase
Solution Approach 1:
The patent employs disposable colorimetric sensor strips containing indicator particles embedded in a porous polymer matrix. These single-use sensors eliminate the need for expensive, complex analytical equipment and skilled operators. The sensor strip itself is inexpensive to manufacture and discard, replacing the need for costly laboratory instruments while maintaining reliable detection through the inherent color-change properties of the indicator particles.
Solution Approach 2:
The patent extracts the detection function from complex laboratory equipment and concentrates it into simple indicator particles that can be directly embedded in a portable sensor strip. This extraction removes the need for sophisticated analytical instruments and skilled users, leaving only the essential detection capability in a simple, inexpensive format that anyone can use.
2Measurement precision
If high particle loadings are used in polymer matrix composites, then detection sensitivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a porous polymer matrix structure that can accommodate high loadings of indicator particles within its pore network. The porosity allows particles to be distributed throughout the bulk material without requiring complex manufacturing processes. Standard techniques like compression molding or injection molding can be used to create the porous structure, followed by simple particle incorporation, making high-loading composites easier to manufacture than dense alternatives.
Solution Approach 2:
The patent creates a composite material system combining indicator particles with a porous polymer matrix. This composite approach allows the indicator particles to be distributed throughout the polymer structure using conventional composite manufacturing techniques. The synergy between the particle-loaded matrix and the porous structure enables high sensitivity detection while maintaining manufacturing simplicity through established composite processing methods.
3Adaptability or versatility
If phase separation methods are used to create porous structures, then sensor flexibility and analyte access are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs phase separation during polymer processing to create the porous matrix structure. By controlling temperature, solvent content, or other processing parameters during phase transition, a porous network forms that provides both flexibility and analyte access. This self-organizing phase separation process occurs during standard polymer manufacturing, avoiding the need for post-processing steps or highly precise manufacturing controls while naturally creating the desired flexible, porous sensor structure.
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 polymer matrix composite enables rapid, inexpensive, and simple detection of analytes, offering improved sensitivity and stability, with high particle loadings and phase separation methods allowing for flexible and porous structures that maintain their form and functionality.
Implementation Method 1
a porous polymeric network structure
Implementation Method 2
heating the article in an environment to retain at least 90 percent by weight of the solvent in the article, based on the weight of the solvent in the article, and solubilize at least 50 percent of the thermoplastic polymer
Implementation Method 3
inducing phase separation of the thermoplastic polymer from the solvent to provide the polymer matrix composite
Implementation Method 4
indicator particles which provide a detectible change in at least one of optical, ultraviolet (UV), infrared (IR), mechanical, chemical, or electrical properties after exposure to a stimulant
Data Source
AI summary
A polymer matrix composite comprising a porous polymeric network; and a plurality of indicator particles distributed within the polymeric network structure; wherein the indicator particles are present in a range from 1 to 99 weight percent, based on the total weight of the indicator particles and the polymer (excluding the solvent); and wherein the polymer matrix composite has a density of at least 0.05 g/cm3; and methods for making the same. The polymer matrix composites are useful, for example, as sensors.