Ion-Selective Membrane Sensor Barrier Against Plasticizer Diffusion
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Solution Overview
Problem
Analytical devices using porous substrates face a challenge in maintaining measurement sensitivity and stability over long-term storage due to the seepage and diffusion of plasticizers in the ion selective membrane, which is exacerbated by high temperatures, leading to changes in potential and reduced responsiveness to ion concentrations.
Innovation Solution
Incorporating a protective layer within the porous substrate that inhibits the penetration of plasticizers, using materials like polyimide resin or fluorine resin to seal the region where the ion selective membrane and substrate interface, thereby maintaining the integrity of the ion selective membrane composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ion selective membrane contains a plasticizer to enable ion transport function, then the measurement sensitivity is improved, but the plasticizer seeps out during long-term storage causing potential drift and sensitivity change
Solution Approach 1:
The patent introduces a protective layer as an intermediary barrier between the ion selective membrane and the external environment. This layer contains a plasticizer-retaining component that mediates the interaction between the membrane plasticizer and the porous substrate, preventing plasticizer loss while maintaining ion transport functionality.
Solution Approach 2:
The protective layer is formed in advance on the porous substrate before the ion selective membrane is applied. This preliminary action creates a pre-positioned barrier that will retain the plasticizer during subsequent long-term storage, preventing the harmful effect before it occurs.
2Ease of operation
If the porous substrate is used to enable sample penetration and electrode connection, then the device simplicity and ease of operation are improved, but the capillary phenomenon accelerates plasticizer diffusion reducing measurement stability
Solution Approach 1:
The protective layer is applied locally to specific regions of the porous substrate where plasticizer retention is critical. This local quality approach maintains the overall simplicity of the porous substrate structure while providing targeted protection against plasticizer diffusion in the critical areas near the ion selective membrane.
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 protective layer effectively prevents plasticizer diffusion, ensuring stable measurement sensitivity and appropriate potential for selected ions even after long-term storage, without the need for low-temperature storage conditions.
Implementation Method 1
a protective layer, wherein the ion selective membrane comprises a plasticizer; and wherein the protective layer is formed in the inside of the porous substrate as close to at least a portion of the ion selective membrane and comprises a component inhibiting penetration of the plasticizer
Implementation Method 2
When the seeping plasticizer encounters the porous substrate, the seeping of the plasticizer is accelerated by the capillary phenomenon of the porous substrate
Data Source
AI summary
A purpose is to provide an analytical device capable of maintaining good measurement sensitivity even after long-term storage and obtaining a proper potential for selected ions. Provided is an analytical device comprising: a porous substrate; an electrode formed in an inside of, on a surface of, or from the inside to the surface of the porous substrate; an ion selective membrane covering the electrode; and a protective layer, wherein the ion selective membrane comprises a plasticizer; and the protective layer is formed in the inside of the porous substrate as close to at least a portion of the ion selective membrane and comprises a component inhibiting penetration of the plasticizer.