EWOD Microdroplet Substrate for Uniform DNA and pH Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrowetting-on-dielectric (EWOD) technologies face challenges in efficiently manipulating and analyzing droplets, particularly in creating extremely small drops for DNA concentration measurement and pH value detection.
Innovation Solution
The use of a multilayer ceramic substrate with a hydrophobic layer and integrated electrodes, along with a disposable substrate with a socket for an integrated circuit package, enables precise manipulation of droplets, mixing with reagents, and division into microdroplets for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional EWOD technologies are used for droplet manipulation, then droplet movement is achieved, but uniform microdroplet formation and precise analysis are difficult
Solution Approach 1:
The device is divided into multiple functional layers: a multilayer ceramic substrate providing structural support and electrical pathways, a dielectric layer for electrical insulation, and a hydrophobic coating layer for droplet manipulation. This segmentation allows each layer to be optimized independently for its specific function, achieving uniform microdroplet formation without excessive overall complexity.
Solution Approach 2:
The patent employs composite material structures including multilayer ceramic substrates combined with dielectric materials and hydrophobic coatings. This composite approach enables the integration of multiple properties (mechanical strength, electrical insulation, surface energy control) within a unified substrate system, facilitating precise microdroplet manipulation and analysis.
2Measurement precision
If integrated sensors are incorporated for DNA concentration and pH measurement, then analysis precision is improved, but device complexity increases
Solution Approach 1:
Multiple sensing functions (DNA concentration detection and pH measurement) are merged into a single integrated sensor array on the substrate. This consolidation allows simultaneous multi-parameter analysis of microdroplets without requiring separate devices, improving measurement precision while managing complexity through functional integration.
Solution Approach 2:
The sensor system is designed with multi-functionality to detect multiple parameters (DNA concentration, pH, and potentially other chemical compositions) using a unified sensing platform. This universal approach enables comprehensive droplet analysis through a single device configuration, reducing the need for multiple specialized sensors.
3Productivity
If multilayer ceramic substrate with interconnect layers is used, then electrical connection efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
Electrical connections are established through the third dimension by incorporating conductive interconnect layers within the multilayer ceramic substrate structure. This vertical routing approach allows efficient electrical pathways without increasing lateral footprint, improving connection efficiency while utilizing established multilayer fabrication techniques.
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 allows for the formation of extremely small droplets, enabling accurate DNA concentration measurement and pH value detection, while also being cost-effective and suitable for large-scale production.
Implementation Method 1
Electrowetting-on-dielectric (EWOD) is a liquid driving mechanism to change a contact angle of an aqueous droplet between two electrodes on a hydrophobic surface
Implementation Method 2
measuring the pH value of each sample through integrated ion-sensitive field-effect transistor (ISFET) sensors
Data Source
AI summary
An apparatus for forming a plurality of microdroplets from a droplet includes a substrate, a dielectric layer on the substrate and having a plurality of hydrophilic surface regions spaced apart from each other by a hydrophobic surface, and a plurality of electrodes covered by the dielectric layer. The electrodes are configured to form an electric field across the droplet in response to voltages provided by a control circuit to move the droplet across the dielectric layer in a lateral direction while leaving portions of the droplet on the hydrophilic surface regions to form the plurality of microdroplets on the hydrophilic surface regions.