Microfluidic Fluid Injection Using Electric-Field Interface Disruption
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Solution Overview
Problem
Existing methods for combining fluids in specific sequences, such as in droplet microfluidics, face challenges in controlling the coalescence of droplets, particularly when the fluids do not substantially mix and are not contained within a carrying fluid, as they often fail to disrupt the interface effectively.
Innovation Solution
Applying an electric field at the interface between two fluids in a microfluidic system, where one fluid is not a droplet within a carrying fluid, to disrupt the interface and facilitate the flow of one fluid into or out of the other, using electrodes positioned on opposing sides of the channels to control the electric field and fluid exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If droplet coalescence is used to combine fluids, then fluid combination is achieved, but control of the process is difficult
Solution Approach 1:
The patent replaces mechanical droplet coalescence with electrical field control. Instead of relying on physical contact and mechanical merging of droplets, the invention uses electric fields to precisely control when and how fluids combine at the interface, substituting electrical actuation for mechanical processes.
Solution Approach 2:
The invention changes the control parameter from mechanical position/velocity of droplets to electrical field strength and timing. By modulating the electrical field parameters (voltage, duration, frequency), the system achieves precise control over fluid combination that is not possible with passive droplet coalescence.
2Ease of operation
If interface disruption is applied to enable fluid flow, then fluid exchange is facilitated, but effective disruption is difficult to achieve
Solution Approach 1:
The patent replaces mechanical interface disruption methods with electrical field application. The electric field directly acts on the interface between immiscible fluids to create controlled disruption, enabling fluid exchange without the need for mechanical forces that are difficult to apply at micro-scale interfaces.
Solution Approach 2:
The invention utilizes electrical field-induced phase transition at the fluid interface. The applied electric field causes a transient change in the interfacial state, allowing controlled transfer of fluid between phases while maintaining overall system stability.
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 allows for precise control of fluid exchange, enabling the combination of fluids that would otherwise not mix, such as by injecting a fluid into a droplet or withdrawing fluid from a channel, thereby overcoming the limitations of existing droplet coalescence techniques.
Implementation Method 1
applying an electric field to the interface sufficient to disrupt at least a portion of the interface
Data Source
AI summary
The present invention generally relates to systems and methods for the control of fluids and, in some cases, to systems and methods for flowing a fluid into and/or out of other fluids. As examples, fluid may be injected into a droplet contained within a fluidic channel, or a fluid may be injected into a fluidic channel to create a droplet. In some embodiments, electrodes may be used to apply an electric field to one or more fluidic channels, e.g., proximate an intersection of at least two fluidic channels. For instance, a first fluid may be urged into and/or out of a second fluid, facilitated by the electric field. The electric field, in some cases, may disrupt an interface between a first fluid and at least one other fluid. Properties such as the volume, flow rate, etc. of a first fluid being urged into and/or out of a second fluid can be controlled by controlling various properties of the fluid and/or a fluidic droplet, for example curvature of the fluidic droplet, and/or controlling the applied electric field.