Ion suppressor folded channel structure
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Solution Overview
Problem
Ion re-exchange on the downstream side of the eluent channel in ion suppressors can lead to decreased detection sensitivity in ion chromatography.
Innovation Solution
The ion suppressor features a folded eluent channel structure and the use of shielding membranes to prevent contact between the ion exchange membranes and the eluent in regions with low current, thereby suppressing ion re-exchange and maintaining high detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eluent channel is designed as a straight channel, then the device complexity is low, but ion re-exchange occurs on the downstream side leading to decreased detection sensitivity
Solution Approach 1:
The eluent channel is designed with a folded structure instead of a straight channel, creating a curved path that increases the current flow along the channel. This folded configuration prevents ion re-exchange on the downstream side by ensuring equal current distribution, thereby maintaining detection sensitivity without requiring additional complex components.
Solution Approach 2:
The channel structure transitions from a one-dimensional straight path to a multi-dimensional folded path within the same device footprint. This dimensional transformation allows the channel to fold back on itself, creating multiple passes through the ion exchange membrane while maintaining a compact overall structure, thus improving current distribution and preventing ion re-exchange.
2Measurement precision
If shielding membranes are added to prevent ion re-exchange, then detection sensitivity is improved, but the device complexity increases
Solution Approach 1:
The harmful function of ion re-exchange is eliminated by strategically placing shielding membranes only in specific regions where low current flow occurs, rather than covering the entire channel. This selective extraction of shielding function from problematic areas maintains detection sensitivity while minimizing the number of additional components required.
3Measurement precision
If the current flow is unequal throughout the channel, then device complexity is low, but ion re-exchange occurs leading to loss of measurement precision
Solution Approach 1:
The folded channel structure creates a curved flow path that extends the effective length of the channel within a compact space. This curvature ensures that current flows more uniformly throughout the entire channel length, preventing regions of low current that would otherwise cause ion re-exchange and maintain consistent detection sensitivity across all measurement points.
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 folded eluent channel structure and shielding membranes ensure equal current flow throughout the channel, reducing ion re-exchange and enhancing detection sensitivity for ions measured in ion chromatography.
Implementation Method 1
two ion exchange membranes 241 and 243 between a cathode 221 and an anode 223
Implementation Method 2
When a voltage is applied between the cathode 221 and the anode 223, H+ is supplied from the ion exchange membrane 243 on the anode side to the eluent channel 275
Data Source
AI summary
An ion suppressor includes ion exchange membranes between a pair of electrodes. Regeneration liquid channels are provided in the spaces between the electrodes and the ion exchange membranes, and an eluent channel is provided between the ion exchange membranes. Ion re-exchange in the eluent on the downstream side of the eluent channel is suppressed, thereby making it possible to improve the detection sensitivity for the ion to be measured. For example, the eluent channel has a folded structure, thereby increasing the amount of current on the downstream side of the eluent channel, and thus, the accumulation of ions is suppressed, and accordingly, ion re-exchange in the eluent can be suppressed.