PFPE-PEGDA Microfluidic Devices for Solvent Resistance

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Solution Overview

Problem

Microfluidic devices lack materials that are compatible with organic solvents necessary for synthesizing many materials, limiting the utilization of soft lithography in preparing organic solvent-based emulsions due to poor solvent compatibility of traditional materials.

Innovation Solution

The development of microfluidic devices using a construct formed from perfluoropolyether (PFPE) and poly(ethylene glycol) diacrylate (PEGDA), which allows for tunable wettability and solvent resistance, enabling the production of uniform microdroplets and emulsions by varying the composition of PFPE to PEGDA ratios, and providing compatibility with organic solvents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional materials are used for microfluidic devices, then manufacturing and fabrication is easier, but solvent compatibility is poor which limits use with organic solvents

Engineering Contradiction:

Improvesolvent compatibilityVSAvoidmaterial availability

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent employs a composite material system consisting of perfluoropolyether (PFPE) as the base polymer and poly(ethylene glycol) diacrylate (PEGDA) as the crosslinking agent. This composite formulation creates a microfluidic device material that combines the solvent resistance of fluorinated polymers with the tunability and biocompatibility of PEG-based crosslinked networks, resolving the contradiction between manufacturing feasibility and solvent compatibility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by varying the ratio of PFPE to PEGDA in the liquid precursor formulation. By adjusting this compositional parameter, the material's properties such as wettability, mechanical strength, and solvent resistance can be tuned to match specific application requirements, enabling compatibility with organic solvents while maintaining manufacturability through standard photolithography processes.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If PFPE and PEGDA composition is varied to achieve tunable wettability, then solvent resistance and wettability control improve, but manufacturing complexity increases

Engineering Contradiction:

Improvetunable wettabilityVSAvoidmanufacturing process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements tunable wettability by changing the compositional parameter of the liquid precursor mixture. By adjusting the ratio of PFPE to PEGDA before fabrication, the microfluidic device achieves different surface wetting characteristics without requiring complex post-fabrication processing steps. This parameter-based tuning approach maintains manufacturing simplicity while providing versatile wettability control.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If conventional materials are used, then device fabrication is straightforward, but uniformity of microdroplets and emulsions is limited due to poor solvent compatibility

Engineering Contradiction:

Improveuniformity of microdropletsVSAvoidsolvent compatibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #40Composite materials

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 PFPE-PEGDA microfluidic devices achieve tunable wettability and solvent resistance, allowing for the production of highly uniform microdroplets and emulsions while maintaining compatibility with organic solvents, overcoming the limitations of traditional materials in handling organic solvents.

Implementation Method 1

The microfluidic devices have tunable wettability... by varying the composition of PFPE to PEGDA ratios

Methodology Applied

Scientific EffectWettability: Wetting

Implementation Method 2

The microfluidic devices have solvent resistance... compatibility with organic solvents

Methodology Applied

Scientific EffectSolvent resistance:

Implementation Method 3

The small scale of microfluidics allows precise control of the balance between surface tension and viscous forces in multiphasic flows, making it possible to generate highly monodisperse droplets

Methodology Applied

Scientific EffectSurface tension: Surface Tension

Implementation Method 4

precise control of the balance between surface tension and viscous forces in multiphasic flows

Methodology Applied

Scientific EffectViscous forces:

Data Source

PatentUS11498070B2Microfluidic devices with tunable wettability and solvent resistance and methods for manufacturing the same

Publication Date: 2022.11.15 THE TRUSTEES OF THE UNIV OF PENNSYLVANIA

AI summary

Microfluidic devices having a construct formed from perfluoropolyether and poly(ethylene glycol) diacrylate. The construct includes an inlet for receiving a continuous phase fluid, an inlet for receiving a dispersed phase fluid, and a plurality of channels extending through the construct. The plurality of channels are in fluid communication with both the inlet of the continuous phase fluid and the inlet of the dispersed phase fluid. The construct further includes a plurality of microdroplet generators configured to produce microdroplets, each of the microdroplet generators in fluid communication with the plurality of channels. Additionally, the construct includes an outlet formed in the construct and in fluid connection with the plurality of microdroplet generators.