Covalently Bonded Ion-Selective Electrodes Prevent Delamination
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Solution Overview
Problem
Ion-selective and reference electrodes face delamination issues due to mechanical stress and thermal expansion, leading to device failure, as polymeric sensing membranes are not mechanically held in place.
Innovation Solution
A method of functionalizing polymeric substrates with hydroxyl groups through hydrolysis or ozone treatment, followed by reaction with methacryloyl chloride to create reactive surfaces, allowing for photopolymerization or thermal polymerization of acrylate or methacrylate monomers, resulting in covalently bonded sensors that prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymeric sensing membranes are physically adhered to substrates, then ease of manufacture is improved, but reliability deteriorates due to delamination under mechanical stress and thermal expansion
Solution Approach 1:
The polymeric substrate surface is pre-functionalized with reactive groups (hydroxyl, carboxyl, or amine groups) through treatments such as plasma, ozone, or chemical etching before membrane deposition. This preliminary surface modification enables subsequent covalent bonding of the sensing membrane to the substrate, preventing delamination that would occur with simple physical adhesion while maintaining ease of manufacture through a standardized multi-step process.
Solution Approach 2:
The patent replaces mechanical physical adhesion with chemical covalent bonding to attach the polymeric sensing membrane to the substrate. By substituting the mechanical attachment mechanism with a chemical bond formation process (using crosslinking agents or in-situ polymerization), the system achieves superior reliability under mechanical stress and thermal expansion while keeping the overall manufacturing complexity manageable.
2Reliability
If covalent bonding is used to attach sensors to polymeric substrates, then reliability is improved by preventing delamination, but device complexity increases due to additional functionalization steps
Solution Approach 1:
The patent employs parameter changes by selecting different surface treatment methods (plasma power, ozone concentration, chemical etching conditions) and varying the crosslinking agent type or polymerization conditions to optimize the covalent bonding process. By adjusting these parameters, the system achieves reliable membrane-substrate attachment while controlling process complexity through established chemical protocols rather than requiring entirely new manufacturing techniques.
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 covalent attachment of sensors to the polymeric substrates enhances long-term performance and stability, maintaining stable potentials even under extreme mechanical stress and varying electrolyte concentrations, significantly improving the lifespan of the electrodes.
Implementation Method 1
The polymeric substrate is treated by hydrolysis, ozone treatment or carbon-carbon double-bond oxidation to produce hydroxyl functional groups on the surface of the polymeric substrate
Implementation Method 2
The polymeric substrate is treated by hydrolysis, ozone treatment or carbon-carbon double-bond oxidation to produce hydroxyl functional groups on the surface
Implementation Method 3
The polymeric substrate is treated by hydrolysis, ozone treatment or carbon-carbon double-bond oxidation to produce hydroxyl functional groups on the surface
Implementation Method 4
Methacryloyl chloride is reacted with the hydroxyl functional groups of the polymeric substrate to provide a reactive surface
Implementation Method 5
Photopolymerization or thermal polymerization of an acrylate or a methacrylate monomer to produce crosslinked acrylate or methacrylate polymers on the reactive surface
Implementation Method 6
Photopolymerization or thermal polymerization of an acrylate or a methacrylate monomer to produce crosslinked acrylate or methacrylate polymers on the reactive surface
Data Source
AI summary
An electrode and a method of making an electrode includes treating polymers that contain functional groups, which by surface functionalization, such as hydrolysis, ozone treatment or carbon-carbon double-bond oxidation to produce hydroxyl functional groups on the surface. Reacting methacryloyl chloride with the resulting hydroxyl functional groups thereby providing a reactive surface. Photopolymerizing or thermal polymerization of crosslinked acrylate or methacrylate polymers on the reactive surface to produce a membrane covalently bonded to the underlying substrate. In addition such an electrode can also be produced on a polystyrene substrate by reacting methacryloyl chloride with the polystyrene substrate and photopolymerizing or thermally polymerizing to produce crosslinked acrylate or methacrylate polymers on the reactive surface to produce a membrane covalently bonded to the underlying polystyrene substrate.