Non-Uniform Microchannel Array for Stable Electrical Property Measurement

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Solution Overview

Problem

Existing electrical property measuring devices face challenges in maintaining current stability and preventing crystallization of by-products due to ion concentration polarization, leading to performance deterioration and increased maintenance costs, particularly in evaluating the electrical properties of living tissues and biomimetic structures.

Innovation Solution

An electrical property measuring device with a non-uniform microchannel array is introduced, featuring parallel flow channels with varying cross-sectional areas, inducing a recirculation flow to enhance ion concentration gradient and improve electrical conductance, thereby stabilizing current measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If ion concentration polarization phenomenon is applied to maintain ion selectivity, then ionic selectivity is improved, but by-products accumulate and crystallize causing performance deterioration

Engineering Contradiction:

Improveionic selectivityVSAvoidby-product crystallization

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The microchannel is divided into multiple sections with different cross-sectional areas (narrow section and wide section), creating distinct functional zones. The narrow section generates strong ion concentration polarization for high selectivity, while the wide section provides buffer capacity to prevent by-product crystallization, thus resolving the contradiction between maintaining ionic selectivity and preventing performance deterioration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the microchannel are designed with different local properties: the narrow section has small cross-sectional area to enhance ion concentration polarization effect for high ionic selectivity, while the wide section has large cross-sectional area to accommodate by-products and prevent crystallization. This local differentiation allows simultaneous achievement of both requirements.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If uniform microchannels are used for fluid flow, then manufacturing simplicity is improved, but ion concentration gradient stability deteriorates leading to current instability

Engineering Contradiction:

Improvemicrochannel fabricationVSAvoidcurrent stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The microchannel is designed with asymmetric cross-sectional area distribution, featuring a narrow section followed by a wide section. This asymmetric geometry creates optimized ion concentration gradients that improve current stability, while the overall simple structure maintains ease of manufacturing through conventional fabrication methods.

Inventive Principle:

Principle #4Asymmetry

3Reliability

If microchannels are periodically cleaned to remove deposits, then ion-selective membrane performance is improved, but maintenance costs and operational complexity increase

Engineering Contradiction:

Improvemembrane performanceVSAvoidmaintenance requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The wide section of the microchannel, which might seem like wasted space, is actually designed to serve as a buffer zone that captures and accommodates by-products, converting what would be a harmful accumulation into a beneficial feature that protects the ion-selective membrane from crystallization and eliminates the need for periodic cleaning.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 device achieves stable current measurements over time by inhibiting crystal formation and increasing power efficiency, allowing for reliable evaluation of biological tissues and biomimetic structures without external energy or chemical treatments.

Implementation Method 1

ion concentration polarization (ICP) phenomenon has been conventionally applied to the structure of the above-described ion-selective permeable membrane. The ion concentration polarization phenomenon refers to an ion transport phenomenon in which an ion depletion layer is formed at cathodic side and an ion enrichment layer is formed at anodic side

Methodology Applied

Scientific EffectIon concentration polarization:

Implementation Method 2

an ion transport phenomenon in which an ion depletion layer is formed at cathodic side and an ion enrichment layer is formed at anodic side

Methodology Applied

Scientific EffectIon transport:

Implementation Method 3

inducing a recirculation flow to enhance ion concentration gradient and improve electrical conductance

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS12461060B2Electrical property measuring device including non-uniform microchannels

Publication Date: 2025.11.04 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

Provided is an electrical property measuring device capable of increasing reliability of evaluation of electrical properties of 3D structures such as living tissues and biomimetic structures and simplifying a measurement process by improving an ion concentration gradient caused by an ion concentration polarization phenomenon. The electrical property measuring device includes an ion-selective permeable membrane having a porous structure; and a non-uniform microchannel spaced apart from the ion-selective permeable membrane and including a plurality of parallelly arranged flow channels through which a fluid passes, wherein cross-sectional areas of the flow channels are different.