Serrated Nozzle for Complete Liquid Drop Transfer
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Solution Overview
Problem
Current microarray technologies face challenges in generating high-density hybridization sites on solid surfaces due to high manufacturing costs, mechanical deformation leading to inconsistent spot sizes, and issues with inkjet printing causing splashing and spreading of droplets, resulting in inconsistent hybridization data and potential cross-contamination.
Innovation Solution
A nozzle design with a serrated inner circumferential surface is used to facilitate the complete transfer of liquid droplets, reducing liquid-solid surface energy and adhesion, allowing for precise and efficient printing of biological materials without residual volume, enabling flexible and compact systems with reduced cleaning needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical micro spotting is used to print droplets, then the process is simple and inexpensive, but the pin tip deforms plastically after repeated use resulting in inconsistent spot size and shapes
Solution Approach 1:
The nozzle is segmented into multiple functional zones: a smooth entry section for droplet formation and a serrated exit section for controlled droplet release. This segmentation allows different parts of the nozzle to perform different functions optimally, preventing the uniform deformation problem of traditional pins while maintaining simplicity.
Solution Approach 2:
The nozzle features an asymmetric geometry with a smooth entry portion transitioning to a serrated exit portion. This asymmetric design creates controlled liquid-solid surface energy variations that prevent adhesion and ensure complete droplet transfer, eliminating the consistency problems associated with symmetric pin tips that deform uniformly.
2Adaptability or versatility
If inkjet printing techniques are used to eject droplets, then the process is mature and widely used, but droplets splash or spread on the printing surface resulting in inconsistent hybridization data
Solution Approach 1:
The serrated geometry at the nozzle exit creates a curved, controlled droplet release profile rather than a sharp ejection. This curved transition zone allows droplets to form smoothly and land gently on the substrate, preventing splashing and spreading while maintaining the maturity of inkjet technology.
Solution Approach 2:
The nozzle applies local quality changes by having a smooth entry section for controlled droplet formation and a serrated exit section for controlled release. This localized geometric variation ensures consistent droplet characteristics without requiring changes to the overall inkjet system architecture.
3Manufacturing precision
If soft printing is used to transfer droplets through liquid-solid contact, then consistent volumes of droplets can be generated, but a residual volume remains in the nozzle after printing which could cause cross-contamination
Solution Approach 1:
The serrated geometry, which initially might be expected to create more complex flow patterns, actually converts the harmful adhesion force into a beneficial effect. The serrations reduce liquid-solid surface energy and prevent droplet adhesion to the nozzle walls, ensuring complete droplet transfer and eliminating residual volume that would cause cross-contamination.
4Device complexity
If traditional nozzles are used without surface modifications, then the device structure is simple, but liquid adhesion prevents complete droplet transfer
Solution Approach 1:
The nozzle applies local quality changes by having a smooth entry section for controlled droplet formation and a serrated exit section for controlled release. This localized geometric variation ensures consistent droplet characteristics without requiring changes to the overall inkjet system architecture.
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 serrated nozzle design ensures complete droplet transfer, improving printing efficiency and consistency, reducing cross-contamination, and enabling the printing of high-density arrays with precise control over droplet size and placement.
Implementation Method 1
The serrated inner circumferential surface reduces liquid-solid surface energy and adhesion, allowing for complete droplet transfer
Implementation Method 2
The serrated inner circumferential surface reduces liquid-solid surface energy and adhesion, allowing for complete droplet transfer
Data Source
AI summary
A printhead device for transferring liquid droplets from a nozzle includes a liquid source coupled to a nozzle via a microchannel. The nozzle is formed from an orifice having an inner circumferential surface, wherein at least a portion of the inner circumferential surface is serrated. Liquid droplets are transported from the source to the nozzle using a liquid droplet driver (e.g., employing a plurality of driving electrodes). Transfer of droplets to another surface can be accomplished by contacting a bulging droplet in the nozzle with a printing surface. The surface and/or nozzle are then moved relative to one another to effectuate complete transfer of the liquid drop from the nozzle.