Microfluidic Products with Surface Energy Gradient Coatings

Solution Overview

Problem

Current microfluidic devices face challenges in controlling fluid flow due to high hardware costs, complexity, and inefficiencies in fluid management, particularly due to the need for expensive pumps and control systems, as well as issues with fluid disruption by bubbles and surface variances, leading to increased fluid usage and waste.

Innovation Solution

The use of surface energy gradients to control fluid flow within microfluidic products, allowing for precise control of fluid velocity, acceleration, and stopping by adjusting the surface energy coatings along the fluid passages, reducing the need for external pumps and control systems and minimizing fluid loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If external pumps and control systems are used to control fluid flow, then fluid flow control capability is improved, but device complexity and hardware cost increase

Engineering Contradiction:

Improvefluid flow control capabilityVSAvoidhardware complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The microfluidic device uses surface energy gradients created by hydrophobic/hydrophilic patterns on channel walls to autonomously control fluid flow, eliminating the need for external pumps and control systems. The fluid self-regulates its movement based on the surface energy distribution within the channels.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces mechanical pump systems with a surface energy-based control mechanism. By patterning the channel walls with regions of different surface energies (hydrophobic vs. hydrophilic), the system uses capillary pressure gradients instead of mechanical forces to drive and control fluid flow.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If external pumps and control systems are used to control fluid flow, then fluid flow control capability is improved, but hardware cost increases

Engineering Contradiction:

Improvefluid flow control capabilityVSAvoidhardware cost

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The microfluidic device uses surface energy gradients created by hydrophobic/hydrophilic patterns on channel walls to autonomously control fluid flow, eliminating the need for external pumps and control systems. The fluid self-regulates its movement based on the surface energy distribution within the channels.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces mechanical pump systems with a surface energy-based control mechanism. By patterning the channel walls with regions of different surface energies (hydrophobic vs. hydrophilic), the system uses capillary pressure gradients instead of mechanical forces to drive and control fluid flow.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If traditional fluid management methods are used, then fluid flow is maintained, but fluid disruption by bubbles and surface variances occurs

Engineering Contradiction:

Improvefluid flow stabilityVSAvoidfluid disruption by bubbles and surface variances

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different surface properties (hydrophobic vs. hydrophilic) to different regions of the channel walls to create localized surface energy gradients. This spatial variation in surface quality enables continuous capillary-driven flow that overcomes disruptions from bubbles and surface irregularities by maintaining a directional energy gradient.

Inventive Principle:

Principle #3Local quality

4Reliability

If traditional fluid management methods are used, then fluid flow is maintained, but fluid usage and waste increase

Engineering Contradiction:

Improvefluid flow maintenanceVSAvoidfluid usage and waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The microfluidic device uses surface energy gradients created by hydrophobic/hydrophilic patterns on channel walls to autonomously control fluid flow, eliminating the need for external pumps and control systems. The fluid self-regulates its movement based on the surface energy distribution within the channels.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent modifies the surface energy parameters of the channel walls through hydrophobic/hydrophilic patterning. This changes the interfacial energy characteristics to create capillary pressure gradients that efficiently drive fluid flow with minimal fluid consumption and waste.

Inventive Principle:

Principle #35Parameter changes

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 approach reduces the cost and complexity of microfluidic systems, enables more precise fluid management, and minimizes fluid usage and waste, while allowing for smaller, more efficient device designs.

Implementation Method 1

use of surface energy gradients to control fluid flow within the product

Methodology Applied

Scientific EffectSurface energy gradient: Surface Tension

Implementation Method 2

surface energy gradients to control fluid flow, including stopping and initiating flow within the microfluidic product

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS12083517B2Microfluidic products with controlled fluid flow

Publication Date: 2024.09.10 BABCOCK BRIAN DAVID

AI summary

A microfluidic product utilizing gradient surface energy coatings for fluid control comprising a plurality of fluid passages wherein at least one fluid passage comprises a coating configured to control liquid flow wherein the coating configured to control liquid flow comprises a gradient surface energy coating from a proximal location to a distal location on a surface of the fluid passage. The product can include uniform regions and surface gradient regions in the same passage. Coating compositions and product dimensions can be selected to provide control over different flow properties including fluid velocity, reduction and acceleration of fluid flow, and starting and stopping fluid flow.