Ion-Selective Membrane With Covalent Additive Bonding Against Leaching
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Solution Overview
Problem
Ion-selective electrodes used for detecting nitrate, phosphate, and potassium levels suffer from reduced performance over time due to leaching of components from the polymer matrix, leading to decreased sensitivity and selectivity, and potential health hazards from heavy metal contamination.
Innovation Solution
An ion-selective membrane with an ionic lipophilic additive covalently bonded to the polymer matrix, along with an ionophore, which enhances selectivity and stability by preventing leaching and minimizing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nitrate selective membranes with suspended ionic lipophilic additive and plasticizer are used, then initial sensitivity and selectivity are achieved, but performance degrades over time due to leaching of components
Solution Approach 1:
The ionic lipophilic additive is covalently attached to the polymer matrix before the membrane is assembled into the electrode. This preliminary covalent bonding prevents the additive from leaching during subsequent use, thereby maintaining sensitivity and selectivity over extended periods without requiring frequent replacement.
2Reliability
If phosphate selective membranes containing heavy metals or organotin compounds are used, then selectivity and sensitivity are enhanced, but health hazards and environmental contamination occur
Solution Approach 1:
The invention removes harmful heavy metals and organotin compounds from the membrane composition entirely. Instead, it uses a covalently bonded ionic lipophilic additive system that achieves the necessary ion-selective properties without relying on toxic substances, thereby eliminating health and environmental hazards while maintaining detection performance.
3Measurement precision
If phosphate selective membranes with ionophore and cationic lipophilic salt are used, then initial performance is achieved, but performance degrades due to leaching of ionophore and lipophilic salt
Solution Approach 1:
The ionophore and cationic lipophilic salt are covalently attached to the polymer matrix before membrane assembly. This preliminary covalent bonding ensures these critical components remain固定在 the membrane structure during use, preventing leaching and maintaining measurement precision over extended periods.
4Reliability
If conventional membranes with multiple suspended components are used, then initial selectivity is achieved, but component leaching reduces lifespan
Solution Approach 1:
The invention creates a composite membrane structure where the ionic lipophilic additive is chemically integrated into the polymer matrix through covalent bonding. This composite approach combines the stability of the polymer matrix with the ion-selective properties of the additive, ensuring both compositional stability and extended lifespan.
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 solution results in an ion-selective membrane with improved lifespan and maintained selectivity, capable of continuous usage for over 100 days without significant performance degradation, and avoids health hazards from metal contamination.
Implementation Method 1
an ionic lipophilic additive covalently bonded to the polymer matrix
Implementation Method 2
Nitrate levels in aqueous solutions can be detected with nitrate selective electrodes, which are conferred their selectivity by the nitrate selective membrane
Data Source
AI summary
There is provided an ion selective membrane comprising a polymer matrix and an ionic lipophilic additive covalently bonded to the polymer matrix. There are also provided a method of preparing the ion selective membrane, an ion selective electrode comprising the ion selective membrane and a method of preparing the ion selective electrode.