Microfluidic Stagnation Channel Vibration for Particle Synthesis

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Solution Overview

Problem

Conventional microreactors face challenges in continuously producing uniform particles due to particle deposition and channel blockage, especially when the time from nucleation to growth phase in the particle formation process is short, making it difficult to maintain stable and uniform particle diameter synthesis.

Innovation Solution

A microfluidic device with a synthesis channel portion that includes a mixing channel and a stagnation channel, where the stagnation channel is subjected to vibration to prevent particle deposition, featuring a larger cross-sectional area and longer length in the vibration direction, allowing for effective detachment of particles and maintaining flow stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If particles are generated in the microchannel, then particle synthesis is achieved, but particles are bonded and deposited in the channel causing blockage

Engineering Contradiction:

Improveparticle synthesisVSAvoidchannel blockage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies vibration to the stagnation channel portion to prevent particle deposition and aggregation. The vibration mechanism causes particles to oscillate and prevents them from bonding to the channel walls, thereby maintaining continuous operation without blockage while preserving particle synthesis capability.

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The synthesis channel portion is divided into two distinct sections: a mixing channel portion for particle generation and a stagnation channel portion for particle retention. This segmentation allows the mixing region to focus on synthesis while the stagnation region handles particle accumulation, with vibration applied specifically to the stagnation region to prevent blockage.

Inventive Principle:

Principle #1Segmentation

2Reliability

If vibration is applied only to the stagnation channel portion, then particle deposition is prevented, but the time from nucleation to growth phase must be sufficiently long

Engineering Contradiction:

Improveparticle deposition preventionVSAvoidnucleation to growth phase time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Vibration is applied locally only to the stagnation channel portion rather than the entire synthesis channel. This localized application prevents particle deposition where it occurs (in the stagnation region) while allowing the mixing channel to maintain conditions suitable for rapid nucleation and growth, thus accommodating materials with short phase transition times.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If conventional batch method with mechanical stirring is used, then fluid mixing is achieved, but uniform particle diameter cannot be stably produced

Engineering Contradiction:

Improvefluid mixingVSAvoidparticle diameter uniformity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical stirring with a microfluidic flow system where fluids are mixed through controlled flow in channels. This substitution provides more precise control over mixing conditions and residence time, enabling stable production of monodisperse particles with uniform diameter while maintaining ease of operation through continuous flow.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 enables stable production of uniform particles with a short nucleation-to-growth phase material by preventing channel blockage and ensuring continuous operation, even with materials that have a high thickening rate during synthesis.

Implementation Method 1

a vibration applicator that applies vibration to the fluid flowing through the synthesis channel portion

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS20240408600A1Microfluidic device

Publication Date: 2024.12.12 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A microfluidic device comprises: a first channel through which a first raw material fluid flows; a second channel through which a second raw material fluid flows; a synthesis channel portion that joins the first channel and the second channel to cause the first raw material fluid and the second raw material fluid to react with each other to generate nuclei, thereby obtaining a fluid containing particles obtained by growing the nuclei; and a vibration applicator that applies vibration to the fluid flowing through the synthesis channel portion, in which the synthesis channel portion includes a mixing channel portion that is a merging portion of the first channel and the second channel, a stagnation channel portion that communicates with a downstream side of the mixing channel portion and to which vibration is applied by the vibration applicator.