Photocurable Resin for High-Resolution 3D Microfluidic Devices
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Solution Overview
Problem
Current 3-D printing technologies for microfluidics are limited by slow manual fabrication techniques, restricted to 2-D device designs, and lack materials with adequate gas permeability and high-resolution printing capabilities.
Innovation Solution
Development of a photocurable resin comprising a copolymer with methacryloxypropyl-methysiloxane and dimethylsiloxane repeating units, combined with a methacryloxypropyl terminated dimethylsiloxane diluent and a phosphine oxide photoinitiator, enabling stereolithographic printing of 3-D microfluidic devices with improved resolution and gas permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas permeable materials like PDMS are used in microfluidics, then gas permeability is improved, but high-resolution 3-D printing capabilities are lost
Solution Approach 1:
The patent creates a composite photocurable resin system combining polydimethylsiloxane (PDMS) base polymer with methacrylate functionalized silane crosslinking agents. This composite formulation enables the material to simultaneously achieve gas permeability characteristics of PDMS and the high-resolution 3-D printing capabilities required for microfluidic device fabrication, resolving the contradiction between material functionality and manufacturing precision
Solution Approach 2:
The patent modifies the chemical parameters of PDMS by introducing methacrylate functional groups and controlling crosslinking density through specific silane additives. These parameter changes transform PDMS from a material unsuitable for high-resolution printing into a photocurable composition that maintains gas permeability while achieving the dimensional precision required for microfluidic channels and features
2Reliability
If manual fabrication techniques are used for microfluidics, then device functionality is achieved, but productivity is reduced
Solution Approach 1:
The patent replaces manual mechanical fabrication processes with automated stereolithographic 3-D printing using photocurable resin. The photopolymerization process substitutes hands-on assembly and bonding operations with automated layer-by-layer construction driven by UV light patterns, dramatically increasing productivity while maintaining device functionality through precise digital control
Solution Approach 2:
The patent incorporates all device features, channels, and structural elements directly into the photocurable resin formulation before printing begins. This preliminary integration of all functional elements into a single printable composition eliminates subsequent manual assembly steps, enabling automated end-to-end fabrication from digital model to functional device
3Ease of manufacture
If 2-D device designs are used in microfluidics, then manufacturing simplicity is maintained, but device complexity and functionality are restricted
Solution Approach 1:
The patent enables transition from 2-D microfluidic designs to true 3-D structures through stereolithographic printing of photocurable resin. The technology allows vertical stacking, three-dimensional channel routing, and complex spatial geometries that were impossible with planar fabrication methods, dramatically expanding design flexibility while maintaining manufacturing simplicity through automated printing processes
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 described resin allows for the stereolithographic printing of 3-D microfluidic devices with enhanced resolution, achieving channel heights and membrane thicknesses as small as 60 microns and 20 microns respectively, and demonstrating improved gas permeability suitable for microfluidic applications.
Implementation Method 1
selectively photopolymerizing a first portion of the resin to provide a first photocured layer, and selectively photopolymerizing a second portion of the resin to provide a second photocured layer
Implementation Method 2
0.01-10% by weight of a phosphine oxide photoinitiator selected from phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, diphenyl-(2,4,6, trimethylbenzoyl)phosphine oxide (TPO), ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate (TPO-L)
Data Source
AI summary
Provided are photocurable resins comprising a poly(siloxane)-based copolymer together with a photoinitiator, and other optional ingredients such as a photocurable diluent, a photoabsorber, a photosensitizer, or a hydrophillic additive. Also provided are methods of stereolithographically printing a 3-D object from a disclosed resin. Also provided is an improved method for stereolithographically printing a 3-D object, the improvement comprising the use of a disclosed photocurable resin. Further provided is a 3-D microfluidic device such as an artificial lung prepared from a disclosed photocurable resin.