Micro-reactor Gap Design for Particle Positioning
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Solution Overview
Problem
The existing micro-reactor design for TEMs has a limited transparent surface area, making a significant portion of the channel invisible, and lacks means to position particles or cells for observation, leading to inefficient and time-consuming identification processes.
Innovation Solution
The micro-reactor incorporates a second channel with a gap connecting the first channel, allowing for particle or cell positioning through controlled pressure differences, with one layer transparent to the method of inspection, enabling precise placement and observation within the gap, which can be optimized for various microscopy techniques by adjusting the gap distance within the operating range of the inspection method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If recesses are created in cover layers for TEM observation, then particle visibility is enabled, but the total transparent surface area remains only a fraction of the cover layer area, making most of the channel invisible
Solution Approach 1:
The invention transitions from a 2D observation plane (recesses in flat cover layers) to a 3D observation volume by creating a suspended bridge structure that forms a gap between layers. This gap volume can be positioned within the depth of field of optical microscopes, enabling observation throughout the entire channel height rather than just at the layer surfaces.
Solution Approach 2:
The cover layers are segmented to create a gap region with a suspended bridge, dividing the structure into distinct zones: the bridge region for optical observation and other regions for fluid flow. This segmentation allows different portions of the micro-reactor to serve different functions simultaneously.
2Measurement precision
If recesses are used for observation, then particles can be viewed, but there are no means to position particles or cells within the micro-reactor for observation
Solution Approach 1:
The invention introduces dynamic control of fluid flow through the channels using pressure gradients. By adjusting pressure differences between channels, particles can be dynamically directed and positioned within the observation gap, transforming the static observation capability into an actively controllable system.
Solution Approach 2:
The invention uses pressure-driven fluid flow control to manipulate particle positions. Pressure gradients applied through the channels enable precise positioning of particles and cells within the observation gap without mechanical intervention, leveraging hydraulic principles for remote control.
3Measurement precision
If a small gap is created for optical microscopy depth of focus, then observation precision is improved, but the gap distance must be precisely controlled within the operating range of the inspection method
Solution Approach 1:
The invention optimizes the gap dimensions as a design parameter, creating a suspended bridge with controlled thickness that defines the observation gap. By carefully selecting the bridge thickness and gap dimensions during fabrication, the system achieves optimal balance between depth of field requirements and manufacturing feasibility without requiring post-fabrication adjustment.
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 design enhances the visibility of particles or cells within the micro-reactor, allowing for more efficient positioning and observation, reducing the time required for identification and improving the chances of successful imaging, while also enabling the use of different inspection methods like optical microscopy and electron microscopy.
Implementation Method 1
particles and/or cells in the fluid can be positioned in the gap, e.g. by controlled pressure differences between the channels
Implementation Method 2
at the window the two layers being separated by a third distance smaller than the first distance and smaller than the second distance, at the window the two layers being separated by a third distance smaller than the first distance and smaller than the second distance
Data Source
AI summary
A micro-reactor is provided for observing small particles, cells, bacteria, viruses or protein molecules in a fluid. The micro-reactor includes a first channel for containing the fluid and a second channel adjacent to the first channel. A gap connects the first channel and the second channel and a window transparent to the method of inspection is provided at the gap. A static or dynamic gradient, such as a gradient in concentration of a chemical or biological material, in pressure, in temperature, in electric potential, or in magnetic field, is applied across the gap, thereby causing the particles to cross the gap. By detecting a property of the particles upstream in the first channel and then applying a pressure burst over the channels when the property meets certain pre-set criteria, only selected particles can be placed in the gap.