Modular Microfluidic Paper Chips Using Inkjet Printing
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Solution Overview
Problem
Existing digital microfluidic chip manufacturing processes are complex, costly, and environmentally harmful, requiring expensive equipment and chemicals, and involve closed systems that complicate electrode pattern formation and analysis.
Innovation Solution
A module-type microfluidic paper chip is manufactured using inkjet printing with carbon nanotube ink to simplify the process, allowing for the printing and assembly of various electrode patterns on paper, which can be cut and assembled to create a functional chip, reducing complexity and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography and etching are used to manufacture digital microfluidic chips, then manufacturing precision and reliability are improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent replaces the mechanical and chemical processes of photolithography and etching with inkjet printing technology. The inkjet printer deposits conductive ink (containing carbon nanotubes or metal particles) directly onto the substrate to form electrode patterns, eliminating the need for photomasks, UV exposure, and chemical etching processes while maintaining acceptable manufacturing precision.
Solution Approach 2:
The patent changes the manufacturing approach from subtractive (etching) to additive (printing). By using inkjet printing with conductive ink, the electrode patterns are built up layer by layer rather than being etched away from a continuous layer, fundamentally changing the manufacturing parameters and process steps required.
2Manufacturing precision
If photolithography and etching are used to manufacture digital microfluidic chips, then manufacturing precision is improved, but harmful factors and environmental impact worsen
Solution Approach 1:
The patent substitutes the chemical etching process with inkjet printing using conductive ink. This eliminates the need for hazardous chemicals such as photoresists, developers, and etchants that are typically used in photolithography and etching processes, thereby reducing harmful factors and environmental impact.
Solution Approach 2:
The patent uses a disposable inkjet-printed electrode layer instead of reusable photomasks and chemical baths. The conductive ink is deposited directly and cured to form the electrode pattern, eliminating the need for expensive and hazardous chemical processing steps while maintaining manufacturing precision.
3Reliability
If closed system chip design is used, then product reliability is improved, but ease of operation worsens due to cover plate removal requirements
Solution Approach 1:
The patent divides the chip into modular components: the substrate with printed electrode patterns, the reaction area, and the cover plate. This segmentation allows the cover plate to be easily removed for product analysis while maintaining the integrity and reliability of the underlying electrode patterns and reaction chambers during operation.
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 provides an economical and highly usable microfluidic chip with simplified patterning, enabling efficient control of fluid movement through electrowetting, and facilitating chemical synthesis processes like nanoparticle synthesis.
Implementation Method 1
printing electrode patterns on a substrate using a conductive ink and inkjet printing
Implementation Method 2
The carbon nanotube has a similar electric conductivity to copper
Implementation Method 3
Through electrowetting, the movement of fluid can be controlled by electricity, and the electrowetting is employed in the digital microfluidic chips
Implementation Method 4
the same thermal conductance diamond which is the most excellent in the natural system
Data Source
AI summary
The present invention relates to a method for manufacturing a module type microfluidic chip comprising: (a) printing electrode patterns on a substrate using a conductive ink and inkjet printing; (b) cutting the printed electrode patterns; and (c) assembling the cut electrode patterns to manufacture the module type microfluidic paper chip. Unlike the traditional method for manufacturing printed circuit substrate using a patterning agent or device, the method of the present invention only incorporates a simple printing process using an inkjet printer, and thus patterning can be simplified and various types of chips can be manufactured depending on the assembly type of electrode patterns. Accordingly, inexpensive, economical, and highly utilizable microfluidic chips can be provided using the method of the present invention.