Microfluidic Bubble Valve Chip Without Moving Parts
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Solution Overview
Problem
Traditional microfluidic valves made of flexible materials or mechanically actuating parts are prone to failure over time, making it challenging to effectively manipulate fluid flow in microfluidic systems used for applications like biotechnology and drug screening.
Innovation Solution
A microfluidic chip utilizing an inflexible material with an elastic modulus of 0.1 GPa to 450 GPa, featuring a bubble valve generated electrolytically by a working electrode, which supports a bubble to control fluid flow without moving parts, using a substrate like silicon or glass and electrodes such as gold or platinum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flexible materials or mechanically actuating parts are used to create valves in microfluidic systems, then fluid flow manipulation is achieved, but the valve components are prone to failure over time
Solution Approach 1:
The patent replaces traditional mechanical valves with moving parts with an electrolytically actuated bubble valve system. The bubble is generated through electrochemical reactions at an electrode interface, eliminating mechanical moving parts that are prone to failure. The bubble forms, blocks flow, and dissipates through controlled electrolysis, providing reliable fluid manipulation without mechanical wear.
Solution Approach 2:
The patent uses a gas bubble generated through electrolysis to control fluid flow in the microchannel. The bubble acts as a flow barrier that can be dynamically created and dissipated through electrochemical reactions, leveraging gas-liquid interface physics to achieve valve functionality without mechanical components.
2Device complexity
If electrolytically generated bubbles are used to block microfluidic channels, then moving parts are eliminated, but the system requires support infrastructure
Solution Approach 1:
The patent integrates the electrode directly into the microchannel structure, merging the fluidic channel and electrical components into a single monolithic device. The electrode serves dual purposes: as a structural component of the channel wall and as the active element for bubble generation, eliminating the need for separate support infrastructure.
Solution Approach 2:
The bubble valve system uses the electrolyte already present in the microchannel as the medium for electrochemical reactions. The system self-regulates bubble formation and dissipation through controlled voltage application, eliminating the need for external bubble generation equipment or complex support systems.
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
The bubble valve system provides a resilient and reliable method for separating and manipulating fluid volumes, reducing the need for support infrastructure and enhancing the longevity of microfluidic systems by using an inflexible material and electrolytically generated bubbles to block and unblock channels.
Implementation Method 1
applying a voltage to the working electrode causes the working electrode to electrolytically generate a bubble from the aqueous fluid
Implementation Method 2
a bubble support structure can be formed within the microfluidic channel such that the working electrode is positioned to electrolytically generate a bubble that becomes associated with the bubble support structure
Data Source
AI summary
The present disclosure is drawn to microfluidic chips. The microfluidic chips can include an inflexible material having an elastic modulus of 0.1 gigapascals (GPa) to 450 GPa. A microfluidic channel can be formed within the inflexible material and can connect an inlet and an outlet. A working electrode can be associated with the microfluidic channel and can have a surface area of 1 μm2 to 60,000 μm2 within the microfluidic channel. A bubble support structure can also be formed within the microfluidic channel such that the working electrode is positioned to electrolytically generate a bubble that becomes associated with the bubble support structure.