Microfluidic Chip Droplet Transfer via Electric Field Actuation
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Solution Overview
Problem
Conventional methods for transferring fluid droplets between microfluidic chips result in large volume transfer, leading to inefficiencies and waste due to the use of tubing and channels, which increases transfer time and results in significant fluid loss.
Innovation Solution
A microfluidic device that utilizes an electric field applied between adjacent coplanar microfluidic sub-chips supported on a common substrate to move discrete fluid droplets, eliminating the need for tubing and channels by facilitating the movement of droplets across a gap using electrodes and a hydrophobic layer, ensuring precise and efficient transfer without dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If tubing and channels are used to transfer fluid droplets between microfluidic chips, then fluid transfer is enabled, but large volume transfer occurs leading to waste and time inefficiency
Solution Approach 1:
The patent extracts and eliminates the tubing and channels from the fluid transfer system. By removing these intermediate components, the invention achieves direct droplet transfer between chips via electric field actuation, eliminating the dead volume and fluid waste associated with traditional tubing-based systems
Solution Approach 2:
The patent replaces the mechanical tubing and channel system with an electric field-based actuation system. Electrophoresis and electroosmosis replace the physical conduit system, enabling fluid transfer without mechanical connections and thereby eliminating the associated volume loss and complexity
2Productivity
If tubing and channels are used to transfer fluid droplets, then fluid transfer is achieved, but transfer time increases due to large volume transfer
Solution Approach 1:
By extracting the tubing system, the patent eliminates the time-consuming processes of filling, transferring, and draining large volumes of fluid through channels. Direct droplet actuation via electric fields enables rapid, on-demand transfer without the temporal overhead of conventional fluid pathways
Solution Approach 2:
The patent employs periodic electric field actuation to control droplet transfer. By applying electric fields in controlled cycles, the system achieves precise, timed droplet movement that is more efficient than continuous flow through channels, enabling faster and more synchronized transfers
3Adaptability or versatility
If coplanar microfluidic sub-chips are used, then integration and versatility are improved, but precise droplet transfer across gaps becomes challenging
Solution Approach 1:
The patent replaces mechanical alignment and physical connections with electric field actuation for droplet transfer. The electric fields can be precisely controlled and directed across gaps between coplanar chips, achieving accurate droplet placement without mechanical tolerances or alignment issues
Solution Approach 2:
The patent introduces electric fields as an intermediary mechanism to bridge the gap between coplanar chips. The electric field acts as a non-contact mediator that enables precise droplet transfer across the space between chips without requiring physical connections or extremely tight manufacturing tolerances
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 efficient, controlled, and timed movement of fluid droplets between microfluidic sub-chips, reducing waste and enabling the integration of sub-chips with different functions on a single substrate, leading to cost savings and versatility in design and application.
Implementation Method 1
an electric field is applied between adjacent microfluidic sub-chips that are supported on a common substrate, wherein the electric field moves a discrete fluid droplet from one microfluidic sub-chip to another
Data Source
AI summary
A microfluidic device is provided that includes a substrate and microfluidic sub-chips embedded in the substrate. An electric field is applied between an adjacent pair microfluidic sub-chips to move a fluid droplet from one of the adjacent pair of microfluidic sub-chips to another of the adjacent pair microfluidic sub-chips.