Microfluidic Chip with Nanostructured Particles for Airborne Analyte Detection
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Solution Overview
Problem
Low-concentration detection and analysis of chemical compounds pose challenges due to the need for complex and heavy lab apparatus, making field deployment difficult, and the presence of hazardous analytes that may be contaminated or mixed with false-positive compounds, leading to inaccurate detection.
Innovation Solution
A system and method for capturing and analyzing airborne chemical species using a microfluidic chip with a colloidal solution and nanostructured particles, where the colloidal solution is delivered in a cartridge that includes a microfluidic container with a free surface and an optical window, allowing for optical interrogation using Raman spectrometry to enhance detection sensitivity through Surface Enhanced Raman Spectrometry (SERS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional lab apparatus is used for low-concentration detection, then detection accuracy is improved, but device portability deteriorates
Solution Approach 1:
The system divides the detection function into separate modules: a portable microfluidic chip for sample processing and a separate detection instrument. The chip can be easily replaced and reused, enabling field deployment while maintaining lab-grade detection accuracy through the combination of portable processing and accurate detection.
Solution Approach 2:
The microfluidic chip acts as an intermediary between the sample and the detection instrument. It performs preliminary concentration and preparation functions, allowing the detection instrument to be simpler and more portable while still achieving accurate low-concentration detection through the chip's preprocessing capabilities.
2Measurement precision
If conventional concentration and filtration processes are used, then detection accuracy is improved, but device complexity and portability deteriorate
Solution Approach 1:
The patent combines multiple functions (concentration, filtration, sample preparation) into a single integrated microfluidic chip. This merging eliminates the need for separate complex apparatus while maintaining detection accuracy, as the chip performs all necessary preprocessing steps in a compact form factor.
Solution Approach 2:
The microfluidic chip is designed as a universal platform that can perform multiple detection functions and is compatible with various analytes. The same chip design can be used for different applications by simply changing the target analyte, eliminating the need for multiple specialized apparatus.
3Measurement precision
If existing detection techniques are used for hazardous analytes, then detection capability is improved, but safety and false-positive rates worsen
Solution Approach 1:
The system uses local quality differentiation through selective absorption. The liquid in the microfluidic chip is designed to selectively absorb target analytes based on their chemical properties, while rejecting false-positive compounds. This selective interaction at the local level improves both detection capability and reliability by filtering out interferents.
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
Enables accurate and portable detection of low-concentration analytes with minimal false-positive and false-negative events, allowing for reliable field deployment and real-time analysis of hazardous substances like explosives and biological agents.
Implementation Method 1
certain analytes in the gas phase in contact with a liquid surface will absorb into a liquid while others will not, depending on the hydrophillic/hydrophobic properties of the analyte with the liquid
Implementation Method 2
If the liquid is interrogated with a Raman spectrometer, a phenomenon described as Surface Enhanced Ramam Spectrometry (SERS) occurs. This technique can increase the detectability of even very small concentrations of analyte by the amplification of the spectral emissions due to local electromagnetic (E/M) field effects around the nanostructures.
Data Source
AI summary
This disclosure provides a system component and method for analysis of airborne analytes by absorbing the analytes into a liquid and interrogating the liquid with an analytical instrument. In some examples, a cartridge with a microfluidic chip contains a vessel of a colloidal solution of nanostructured particles in a liquid. The vessel is broken, releasing the solution into microfluidic containers on the chip. Air having analytes is passed over the chip leading to absorption of airborne analytes into the solution. The analytes bind with the nanostructures and are detected optically. Techniques are disclosed for filling the vessel in a way that maintains the efficacy of the solution until it is needed for measurement.