Laser Ablation Capture Cell for Fast Microparticle Analysis
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Solution Overview
Problem
Conventional LA-ICP-MS and LA-ICP-OES techniques are slow and insensitive for high-resolution compositional analysis, particularly for micron-sized and sub-micron particles, requiring up to 278 hours to image an area of 100 mm² at 10 µm pixel resolution and failing to capture nanoparticles effectively.
Innovation Solution
An apparatus and method for efficiently capturing and transporting target material from a laser ablation site using a sample capture cell with optimized inlets and outlets, coupled with a target positioning system for reduced lag and motion hysteresis, allowing for precise alignment and efficient transfer of the target material to a sample preparation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LA-ICP-MS and LA-ICP-OES techniques are used for compositional analysis, then the analysis can be performed with standard equipment, but the analysis time is excessively long (up to 278 hours for 100 mm² at 10 µm resolution) and sensitivity for micron-sized and sub-micron particles is insufficient
Solution Approach 1:
The target material transport system is segmented into multiple independent components: a capture cell with optimized geometry, a transport conduit with controlled flow dynamics, and an injection system. This segmentation allows each component to be optimized independently for speed and sensitivity, resolving the contradiction between fast analysis and high detection sensitivity
Solution Approach 2:
The patent changes critical parameters including carrier gas flow rates, capture cell geometry, and transport conduit dimensions to optimize both analysis speed and particle detection sensitivity. By adjusting these parameters, the system achieves rapid transport of micron-sized and sub-micron particles while maintaining high detection sensitivity
2Loss of time
If the target material is efficiently captured and transported using optimized carrier gas flow and capture cell geometry, then analysis time is reduced and sensitivity is enhanced, but the system complexity increases
Solution Approach 1:
The capture cell design integrates multiple functions into a single component: it serves as both the sample collection chamber and the flow conditioning element. The optimized geometry simultaneously achieves efficient particle capture, flow stabilization, and transport alignment, reducing the need for additional complex components while maintaining rapid analysis capability
Solution Approach 2:
The carrier gas flow system is designed to self-regulate through optimized conduit geometry and inlet/outlet configurations. The flow dynamics automatically adjust to maintain optimal transport conditions without requiring complex control systems, thereby reducing system complexity while achieving rapid particle transport
3Reliability
If the capture cell is positioned close to the laser ablation site to efficiently capture target material, then capture efficiency is improved, but the risk of contamination and interference with the laser beam increases
Solution Approach 1:
The capture cell is positioned asymmetrically relative to the laser ablation site, with the opening oriented at an optimized angle and distance. This asymmetric configuration maximizes capture efficiency for particles ejected in the dominant direction while maintaining sufficient separation to avoid contamination and beam interference
Solution Approach 2:
The carrier gas flow acts as an intermediary between the laser ablation site and the capture cell. It efficiently transports target material particles from the ablation site to the capture cell opening, enabling high capture efficiency while maintaining physical separation that prevents contamination and interference with the laser beam
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 approach significantly reduces analysis time and enhances sensitivity for high-resolution imaging and analysis of small particles, enabling faster and more accurate compositional analysis of targets.
Implementation Method 1
ablating a portion of the target with one or more laser pulses to generate a plume containing particles and/or vapor ejected or otherwise generated from the target
Implementation Method 2
The sample is typically produced by arranging the target within a laser ablation chamber, introducing a flow of a carrier gas within the chamber, and ablating a portion of the target with one or more laser pulses to generate a plume containing particles and/or vapor ejected or otherwise generated from the target
Implementation Method 3
A plasma containing the ionized particles and/or vapor is then analyzed by an analysis system such as an MS or OES system
Data Source
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Figure 2A~3
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AI summary
A laser ablation system includes a sample chamber 102 configured to accommodate a target 104 within an interior 106 thereof, a sample generator 108 configured to remove a portion of the target 104 (which may be subsequently captured as a sample) and an analysis system 1 10 configured to analyze a composition of the sample. A sample capture cell in the chamber proximate to the target has a capture cavity configured to receive target material, a first inlet configured to transmit a flow of a carrier gas from a first location adjacent to an exterior of the capture cell into a region of the capture cavity; and an outlet configured to receive carrier gas from another region of the capture cavity. The sample chamber 102 includes an injection nozzle 120 configured to introduce, into the interior 106, a fluid such as a carrier gas.