Micro-sampling Mixer with Optical Interface for Spectral Detection
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Solution Overview
Problem
The accuracy of real-time online detection in microfluidic reactions is limited due to spectral interference and impact on transmittance of excitation light, affecting the precision of product analysis in micro-channel reactions.
Innovation Solution
A micro-sampling mixer and micro-reaction system are developed, featuring a sample injection channel, diluent injection channel, mixing channel, and a connecting portion for external light detection, which allows for precise mixing and dilution of products, enabling improved spectral detection accuracy through the integration of a micro-sampling chip with transparent silicon-based or borosilicate glass materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If real-time online detection is performed in microfluidic reactions, then reaction monitoring capability is improved, but detection accuracy deteriorates due to spectral interference and impact on transmittance of excitation light
Solution Approach 1:
The microfluidic system is segmented into separate functional zones: a reaction channel for product synthesis and a detection channel for optical measurement. This spatial segmentation allows the reaction to proceed while enabling accurate spectral detection by separating the reactive environment from the detection path, thereby resolving the contradiction between continuous monitoring capability and detection accuracy.
Solution Approach 2:
A transparent window or interface is introduced as an intermediary between the reaction channel and the detection system. This intermediary component enables optical access to the reaction products while maintaining the integrity of the microfluidic reaction environment, allowing accurate spectral detection without direct interference from the reaction conditions.
2Difficulty of detecting and measuring
If spectral detection is performed on microfluidic reaction products, then product analysis capability is improved, but detection precision deteriorates due to spectral interference
Solution Approach 1:
The detection region is designed with specific local optical properties, such as transparent materials and optimized path lengths, to enhance spectral detection precision. The local quality of the detection zone is optimized to minimize spectral interference while maintaining the ability to detect reaction products, thereby resolving the contradiction between analysis capability and detection precision.
3Measurement precision
If excitation light transmittance is maintained high, then detection sensitivity is improved, but reaction product concentration capability deteriorates
Solution Approach 1:
The system transitions from a single-channel design to a multi-dimensional configuration with separate reaction and detection pathways. This dimensional separation allows the excitation light to pass through with high transmittance for sensitive detection, while the reaction products are concentrated in the reaction channel through controlled flow dynamics, resolving the contradiction between detection sensitivity and product concentration capability.
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 system enhances the accuracy of spectral detection and real-time monitoring of microfluidic reaction products, allowing for precise control and analysis of reaction conditions, thereby improving the precision and efficiency of microfluidic reaction processes.
Implementation Method 1
Through continuous fluid mixing in microchannels... continuous flow
Implementation Method 2
sample injection channel, a diluent injection channel, a mixing channel
Implementation Method 3
transparent silicon-based or borosilicate glass materials... transmittance of excitation light
Implementation Method 4
the connecting portion comprises a first sub-connecting portion and a second sub-connecting portion arranged oppositely, the first sub-connecting portion is connected to an incident excitation light fiber, and the second sub-connecting portion is connected to a luminescent optical fiber configured to receive light emitted by a product
Data Source
AI summary
A micro-sampling mixer and a micro-reaction system are disclosed. The micro-sampling mixer includes a sample injection channel, a diluent injection channel, a mixing channel, and a connecting portion. One end of the sample injection channel is in communication with the mixing channel, and another end thereof is a sample input end. One end of the diluent injection channel is in communication with the mixing channel, and another end thereof is a diluent input end. The connecting portion is arranged on the mixing channel, and the connecting portion is connected to an external light detection device so as to perform light detection on a sample in the mixing channel.