Microstructure Separation Filters With Etched Cross Channels
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Solution Overview
Problem
Current separation filters and chromatography devices face challenges in efficiently filtering fluids due to limitations in surface area and particle attraction, particularly in creating microstructure substrates with complex flow orifices that effectively separate compounds at different rates.
Innovation Solution
The development of microstructure filters with layered structural and sacrificial materials, where sacrificial layers are etched to create inlet and outlet channels with cross channels that increase surface area and attract particles, and a housing configured to connect with chromatograph devices for fluid testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional separation filters are used, then the device structure is simple, but the surface area for particle attraction is insufficient and separation efficiency is low
Solution Approach 1:
The patent transitions from traditional two-dimensional flat filter surfaces to three-dimensional microstructure substrates with vertical channels, chambers, and layered architectures. This dimensional transformation dramatically increases the surface area available for particle attraction and separation while maintaining a compact device footprint, directly resolving the contradiction between surface area and device complexity.
Solution Approach 2:
The filter is divided into multiple functional layers including inlet channels, cross channels, outlet channels, and distinct microstructure regions. Each layer performs a specific separation function, allowing the system to achieve high surface area and separation efficiency through modular segmentation rather than a monolithic structure.
2Productivity
If complex flow orifices are created to improve separation efficiency, then particle attraction increases, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical drilling or machining methods for creating flow orifices with photolithography and etching processes. This substitution enables the creation of complex microscale channels and orifices with high precision and repeatability, improving separation efficiency while actually reducing manufacturing complexity through standardized semiconductor fabrication techniques.
Solution Approach 2:
The invention utilizes changes in etch depth, channel width, and orifice size as controllable parameters to optimize separation efficiency. By systematically varying these geometric parameters during fabrication, complex flow patterns are achieved that enhance particle attraction and separation, while the parameter-based approach maintains manufacturing simplicity through process control.
3Productivity
If microstructure substrates with increased surface area are used, then separation efficiency improves, but pressure requirements increase
Solution Approach 1:
The microstructure substrate incorporates varying local properties including regions with different channel widths, pore sizes, and microstructure densities. This local quality variation allows optimization of fluid flow characteristics in different zones, maintaining high separation efficiency in critical regions while reducing overall pressure requirements through strategically designed low-resistance flow paths.
Solution Approach 2:
The patent employs curved and tapered channel designs rather than straight angular paths, creating smooth transitions that reduce turbulence and pressure drops. The curved microchannel geometries optimize fluid flow dynamics, allowing increased surface area for separation while minimizing the pressure requirements needed to drive fluid through the system.
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 microstructure filters enhance the separation efficiency by increasing the surface area for particle attraction, allowing for effective separation of compounds in fluids, and can be used in various applications including chromatography, with improved fluid flow dynamics and reduced pressure requirements.
Implementation Method 1
cross channels that filter a fluid from the inlet channels to the outlet channels
Implementation Method 2
nanostructures that increase a surface area of the filter features to attract particles present in the fluid as the fluid passes through the filter features
Data Source
AI summary
Microstructure separation filters are provided herein, as well as chromatography and other separation devices. An exemplary filter device includes a microstructure filter has a plurality of layers of alternating sacrificial and/or structural material which have been etched to create inlet channels and outlet channels. Adjacent ones of the inlet channels and the outlet channels are spaced apart from one another by cross channels that filter a fluid from the inlet channels to the outlet channels. The cross channels include filter features formed by etching away of a portion of the layers. The device also includes a housing configured to receive the microstructure filter.