Patterned Surface Functionalization for Inkjet DNA Synthesis
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Solution Overview
Problem
Existing high-throughput in situ synthesis methods for nucleic acids by 3D inkjet printing face challenges in stabilizing droplets on glass or silicon substrates, requiring complex photolithography and calibration, which increases costs and reduces yield and throughput.
Innovation Solution
A surface functionalizing method involving hydroxyl enrichment, addition of hydrophobic molecules, etching with a fluoride compound, and application of hydrophilic molecules to create distinct hydrophilic and hydrophobic areas on substrates, using a multi-channel piezoelectric inkjet head assembly for precise droplet placement and synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If hydrophobic silane is added to block hydroxyl groups on glass slide surface to improve hydrophobicity for droplet morphology, then droplet morphology is improved, but reactive sites are reduced leading to reduced DNA synthesis yield
Solution Approach 1:
The invention applies different surface properties to different regions of the glass slide. Hydrophobic silane is applied to the entire surface first, then hydrophilic regions are created locally through photolithography exposure. This local differentiation allows droplets to maintain good morphology on hydrophobic areas while providing reactive hydroxyl groups in exposed regions for DNA synthesis, resolving the contradiction between droplet morphology and synthesis yield.
Solution Approach 2:
The hydrophobic silane coating is applied in advance to the entire glass slide surface before the actual DNA synthesis process. This preliminary action ensures that the surface is pre-conditioned with hydrophobic properties for good droplet morphology, while the photolithography step subsequently creates the necessary hydrophilic reactive sites without requiring re-application of the hydrophobic layer.
2Manufacturing precision
If photolithography technology is used to create specific reaction areas on silicon slice surface, then specific reaction areas are formed, but device complexity and cost increase due to integration of photolithography devices and calibration requirements
Solution Approach 1:
The invention uses a maskless photolithography approach where the pattern is directly written onto the photoresist layer through selective light exposure without requiring physical photolithography masks or complex alignment devices. This copying method achieves precise reaction area positioning while significantly reducing device complexity and calibration requirements compared to traditional photolithography.
3Measurement precision
If complex photolithography and calibration procedures are implemented to achieve precise droplet placement, then positioning accuracy is improved, but operation complexity and time consumption increase
Solution Approach 1:
The system employs automatic image recognition and coordinate transformation algorithms that enable the printing head to self-align and self-position based on visual feedback from the substrate. This self-service capability achieves precise droplet placement accuracy while eliminating the need for manual calibration procedures, significantly reducing operation complexity and time consumption.
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 method reduces costs by eliminating the need for expensive photolithography devices, enhances yield by increasing reactive sites, and improves throughput without complex calibration, enabling high-resolution synthesis of long-chain oligonucleotides.
Implementation Method 1
a multi-channel piezoelectric inkjet head assembly for simultaneous droplets in situ etching
Implementation Method 2
how to stabilize droplets in specific positions by taking advantage of a difference in hydrophobicity and hydrophilicity between groups on the surface
Data Source
AI summary
A surface functionalizing method for use in high-throughput in situ synthesis of nucleic acids by 3D inkjet printing. The method includes subjecting a surface of a substrate to hydroxyl enrichment treatment; adding hydrophobic molecules to the surface of the substrate, the hydrophobic molecules being not reactive with phosphoramidite monomers; spraying, by a multi-channel piezoelectric inkjet head assembly, an etching ink to a predetermined area on the surface of the substrate for micro-etching, the etching ink being prepared with a fluoride compound reactive with the hydrophobic molecules; and adding hydrophilic molecules to the surface of the substrate. By using the method, a functionalized surface with given areas being patterned can be formed on the surface of the substrate, and then a same multi-channel piezoelectric inkjet head assembly can be directly used for subsequent high-resolution printing of phosphoramidite monomers and synthesis of nucleic acids.