Co-Flow Microfluidic Channel Fabrication for 10-100 μm Resolution

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current microfluidic channel fabrication techniques face challenges in achieving high resolution and scalability due to limitations in removing uncured resin and support structures, particularly for channels smaller than 500 μm, and require time-consuming multi-step processes.

Innovation Solution

A co-flow methodology using a thermosetting polymer and a non-reactive support liquid in a laminar flow, where heat is used as a curing source to control the polymerization region precisely, allowing for the formation of microchannels with dimensions as small as 10-100 μm without the need to remove uncured resin.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If additive manufacturing is used to eliminate thin film assembly and photomask preparation, then manufacturing complexity is reduced, but the ability to fabricate enclosed microfluidic channels with diameter less than 500 μm is insufficient

Engineering Contradiction:

Improvemanufacturing process complexityVSAvoidmicrochannel diameter precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent changes the curing parameter from photochemical (UV light) to thermal (heat), enabling precise control of polymerization region through temperature gradients. This allows fabrication of microchannels with diameters as small as 10-100 μm while maintaining process simplicity, resolving the contradiction between device complexity reduction and manufacturing precision improvement.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the phase transition of thermosetting polymer from liquid to solid through heat-induced polymerization. The support liquid remains in liquid phase while the polymer cures in the desired channel region, enabling precise microchannel formation without requiring complex photomask assembly or thin film fabrication processes.

Inventive Principle:

Principle #36Phase transitions

2Productivity

If conventional additive manufacturing is used, then scalability is improved, but resolution for channels smaller than 500 μm is insufficient

Engineering Contradiction:

Improvemanufacturing scalabilityVSAvoidchannel resolution

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

By changing from photochemical to thermal curing parameters, the patent achieves simultaneous improvement in scalability and resolution. The heat-based polymerization allows precise control at microscale (10-100 μm channels) while maintaining additive manufacturing's inherent scalability for larger structures, unlike conventional methods that struggle with sub-500 μm features.

Inventive Principle:

Principle #35Parameter changes

3Speed

If photopolymerization is used, then curing speed is improved, but the ability to control polymerization region precisely is limited due to uncured resin removal challenges

Engineering Contradiction:

Improvecuring speedVSAvoidpolymerization region control

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent changes the curing mechanism from photochemical to thermal, providing superior control over polymerization region boundaries. Heat diffusion can be precisely controlled through temperature gradients and timing, eliminating the uncured resin removal challenges inherent in photopolymerization while maintaining fast curing speeds through efficient heat transfer.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a non-reactive support liquid that creates an inert environment protecting the polymerization region from unwanted reactions. This support liquid allows precise thermal control of polymerization while preventing stray curing, enabling better polymerization region control compared to conventional photopolymerization methods.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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

This method achieves high-resolution microfluidic channel fabrication with improved scalability and reduced costs by precisely controlling the polymerization region, eliminating the need for uncured resin removal and simplifying the manufacturing process.

Implementation Method 1

heat is used as a curing source to control the polymerization region precisely

Methodology Applied

Scientific EffectThermal polymerization: Chemical Bonding

Implementation Method 2

heat is used as a curing source to control the polymerization region precisely

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 3

A co-flow methodology using a thermosetting polymer and a non-reactive support liquid in a laminar flow

Methodology Applied

Scientific EffectLaminar flow: Laminar Flow

Data Source

PatentUS20260084373A1System and methods for high resolution microfluidic channel fabrication via co-phase flow enabled additive manufacturing

Publication Date: 2026.03.26 PURDUE RES FOUND

AI summary

A method is provided for generating a microfluidic channel. The method may involve providing a support liquid to a delivery tube extending through a coupling nozzle. In addition, the method may involve providing an epoxy resin to the coupling nozzle. The method may further involve providing a co-flow of the epoxy resin from the coupling nozzle and the support liquid from the delivery tube to a tubular shell in fluid communication with the coupling nozzle. The microfluidic channel may be formed by curing the epoxy resin with a heat source while the support liquid is flowing centrally through epoxy resin being cured.