Dual-Layer Polymer Substrate Nanoimprinting
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Solution Overview
Problem
Existing methods for fabricating patterned flow cells require a polishing step that wastes polymer or hydrogel and relies on the surface energy of the starting substrate, limiting surface compatibility for downstream applications.
Innovation Solution
A dual-layer polymer substrate is created using nano-imprinting lithography, where a first polymer layer with specific functional groups is imprinted with patterns, and a second polymer layer with different functional groups is applied on top, allowing for tailored chemical functionality and surface energy suitable for applications like sequencing by synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polishing process is used to remove excess polymer or hydrogel, then the surface can be prepared for downstream applications, but polymer or hydrogel is wasted and surface energy depends on the starting substrate
Solution Approach 1:
The patent extracts and removes the polishing step from the fabrication workflow entirely. Instead of polishing to remove excess material, the invention uses selective surface patterning where the polymer is deposited only where needed through nanoimprinting, eliminating the waste generation step while maintaining surface preparation quality.
Solution Approach 2:
The patent applies preliminary action by using a stamp with patterned features to define the exact locations where polymer will be deposited before the actual deposition occurs. This pre-patterned stamp approach ensures polymer is placed only in wells and not in interstitial regions, eliminating the need for subsequent polishing to remove excess material.
2Reliability
If a polishing process is used to remove excess polymer or hydrogel, then the surface can be prepared for downstream applications, but the surface energy of interstitial regions depends on the starting substrate
Solution Approach 1:
The patent applies local quality by creating different surface properties in different locations: the interstitial regions maintain the original substrate surface energy, while the well regions receive polymer coating with tailored surface energy for DNA capture. This spatial differentiation of surface properties enables compatibility with downstream applications without being constrained by the starting substrate's surface energy.
3Manufacturing precision
If standard nano-embossing lithography is used, then nanostructures can be produced, but the process requires multiple steps including etching and functionalization
Solution Approach 1:
The patent merges the nanoimprinting step with the polymer deposition step into a single integrated process. The patterned stamp simultaneously creates the nanostructure geometry and defines where polymer will be deposited, combining what were previously separate etching and functionalization steps into one operation, thereby reducing fabrication workflow complexity.
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 eliminates the need for polishing, reduces material waste, and enables the creation of substrates with tailored surface chemistry and energy, enhancing compatibility with various analytical applications.
Implementation Method 1
irradiating UV light to cure the layers of the first and the second photocurable polymer compositions such that the layers of the first and the second photocurable polymer compositions form a first polymer layer and a second polymer layer respectively
Data Source
AI summary
Substrates comprising dual functional polymer layered surfaces and the preparation thereof by using UV nano-imprinting processes are disclosed. The substrates can be used as flow cells, nanofluidic or microfluidic devices for biological molecules analysis.