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 fluid 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 ensure fluid exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional droplet coalescence methods are used to combine immiscible fluids, then fluid combination is achieved, but interface disruption is ineffective and control is difficult
Solution Approach 1:
The patent replaces conventional mechanical droplet coalescence methods with an electric field-based interface disruption system. Electrodes generate an electric field that directly acts on the interface between immiscible fluids, causing controlled disruption and mixing without relying on mechanical droplet contact and coalescence processes.
Solution Approach 2:
The patent changes the physical state or properties of the interface by applying an electric field. The electric field parameter is used to modify the interfacial tension and properties between immiscible fluids, enabling effective disruption and mixing that cannot be achieved through conventional mechanical means alone.
2Productivity
If electric field is applied to disrupt fluid interface, then interface disruption and fluid exchange are achieved, but device complexity increases due to electrode positioning requirements
Solution Approach 1:
The patent designs electrodes that serve multiple functions: they generate the electric field for interface disruption, define the treatment zone through their positioning, and can be integrated into the microfluidic channel structure itself. This multi-functionality reduces the need for separate components and simplifies the overall device architecture despite the added capability of electric field application.
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 injection and withdrawal, enabling the combination of immiscible fluids into a single droplet, overcoming the limitations of surface tension and surfactant presence, and achieving efficient fluid exchange by disrupting the interface with controlled electric fields.
Implementation Method 1
applying an electric field to the interface sufficient to disrupt at least a portion of the interface
Implementation Method 2
overcoming the limitations of surface tension and surfactant presence
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.