3D Printer Resin for Microfluidic Channels
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Solution Overview
Problem
Current 3D printing technologies are unable to fabricate microfluidic devices with feature sizes in the truly microfluidic regime (<100 μm) due to limitations in achieving small fluid passage dimensions and effective interconnections for highly integrated chips.
Innovation Solution
A custom Digital Light Processing stereolithographic (DLP-SLA) 3D printer with a 385 nm LED and a specifically designed resin, along with a novel channel narrowing technique and integrated microgaskets, enables the fabrication of microfluidic devices with features as small as 18 μm×20 μm and high-density chip-to-chip interconnections, overcoming previous size limitations and interconnection challenges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 3D printing is used, then manufacturing capability is maintained, but feature size cannot reach truly microfluidic regime (<100 μm)
Solution Approach 1:
The patent changes the wavelength parameter of the UV light source from conventional 405 nm to 385 nm, which enables better spectral overlap with the UV absorber and achieves the required manufacturing precision for microfluidic features while maintaining ease of manufacture through standard DLP-SLA processes
Solution Approach 2:
The patent uses a composite resin formulation containing photoinitiator, UV absorber, and monomer/oligomer components specifically designed to work with 385 nm UV light, enabling precise fabrication of microfluidic devices with features below 100 μm while保持 manufacturability
2Reliability
If UV light exposure is applied to cure resin layers, then cross-linking is achieved, but underlying layers with uncured resin are exposed and patterns are lost
Solution Approach 1:
The patent introduces a UV absorber as an intermediary substance in the resin that selectively absorbs 385 nm UV light, preventing it from penetrating to underlying layers and thus preserving uncured resin patterns while still enabling cross-linking in the current layer through controlled exposure
Solution Approach 2:
The patent modifies the optical parameters of the resin by adding UV absorber with specific absorption characteristics at 385 nm, changing the light penetration depth to maintain pattern fidelity across multiple layers while ensuring adequate cross-linking in each layer
3Manufacturing precision
If channel width is reduced to achieve small flow passages, then microfluidic dimensions are achieved, but structural strength and sealing capability deteriorate
Solution Approach 1:
The patent optimizes the photoinitiator concentration and UV exposure parameters to achieve complete cross-linking in narrow channels, ensuring structural strength is maintained even when channel dimensions are reduced to microfluidic scales
Solution Approach 2:
The patent uses a composite resin system with optimized monomer/oligomer ratios and cross-linking agents that provide enhanced mechanical strength at reduced feature sizes, allowing fabrication of strong microfluidic channels with dimensions <100 μm
4Volume of moving object
If chip size is reduced for high integration, then device miniaturization is achieved, but interconnection reliability under fluid pressure deteriorates
Solution Approach 1:
The patent employs flexible gasket materials in the interconnection design that can deform to accommodate misalignment and maintain reliable seals under fluid pressure, enabling high-density interconnections on miniaturized chips while preserving seal reliability
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 approach allows for the successful printing of microfluidic devices with small flow channel cross sections and high aspect ratios, as well as high-density interconnects that withstand fluid pressures, demonstrating the potential to challenge conventional microfluidic fabrication methods and enable mass manufacturing of small, integrated microfluidic devices.
Implementation Method 1
a microfluidic device is formed layer by layer by applying a layer of uncured resin and curing to crosslink the layer by exposure to UV light from a patterned UV source
Implementation Method 2
the resin of the layers includes a UV light absorber having an absorption spectrum that fully overlaps the spectrum of the UV source. This results in little or no exposure of underlying layers to the UV
Data Source
AI summary
Custom 3d printer and resin for microfluidic flow channels and 3D printed high density, reversible, chip-to-chip microfluidic interconnects.