Gas-Pulse Nanoparticle Sampling for Trace Evidence
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Solution Overview
Problem
Current forensic sampling methods, such as swabbing and wet vacuum collection, are inefficient and prone to contamination, especially when dealing with small or trace evidence on porous surfaces, and are not suitable for precise collection of samples like DNA or explosives.
Innovation Solution
A portable sampling device using a high-pressure pulsed valve coupled with a gas flow system and extractive nanoparticles to aerosolize and collect sample particles onto a filter, allowing for precise and non-destructive sampling from various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional swabbing or wet vacuum collection is used, then the sampling process is simple and equipment is inexpensive, but sampling precision and reliability are low
Solution Approach 1:
The patent introduces nanoparticles as an intermediary substance that mediates between the sampling surface and the collection device. These nanoparticles selectively bind to trace evidence (DNA, explosives, drugs) on surfaces, enabling precise capture while maintaining operational simplicity. The nanoparticles act as a bridge that enhances sampling precision without requiring complex equipment.
Solution Approach 2:
The patent employs a pulsed valve system that uses controlled gas flow (pneumatics) to deliver nanoparticles to the sampling surface and subsequently to collect the nanoparticle-evidence complexes. This pneumatic mechanism enables precise sample capture and transport while keeping the device relatively simple and portable.
2Measurement precision
If laser ablation is used, then sampling precision is high, but the equipment is expensive and unsuitable for general operations
Solution Approach 1:
The patent replaces expensive, complex laser ablation equipment with a disposable nanoparticle-based sampling system. The nanoparticles can be discarded after single use, eliminating the need for costly maintenance and calibration of sophisticated equipment while maintaining high sampling precision for trace evidence collection.
Solution Approach 2:
The patent substitutes the complex mechanical and optical system of laser ablation with a simpler chemical-biological approach using nanoparticle binding and pneumatic delivery. This replacement achieves comparable sampling precision for trace evidence without requiring expensive laser equipment.
3Reliability
If swabbing is used on porous surfaces, then the method is simple, but contamination risk increases and sampling precision decreases
Solution Approach 1:
The nanoparticles serve as an intermediary that reduces direct contact between the sampler and the porous surface. By binding to trace evidence in the air space above or on the surface, the nanoparticles minimize contamination from porous materials while maintaining ease of operation through simple pulsing and collection.
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 device enables efficient, precise, and contamination-free collection of trace evidence, including DNA and small molecules, from challenging surfaces, with reduced operator variability and improved sensitivity, facilitating rapid and accurate forensic analysis.
Implementation Method 1
High-pressure gas can be discharged at the sample, thereby aerosolizing a portion of the sample particles
Implementation Method 2
aerosolizing a portion of the sample particles to disperse aerosolized sample particles
Implementation Method 3
At least a portion of the sample becomes coupled to a portion of the extractive particles to form sample particles
Implementation Method 4
A portion of the aerosolized sample particles can be collected onto a collection filter to form a collected sample
Data Source
AI summary
The present disclosure provides for sampling instruments and methods of collecting sample particles. The sampling instrument can include a high-pressure pulsed valve coupled to a gas flow system to displace a sample from a surface. Also included can be a voltage supply coupled to a voltage switch, a suction device, a sample collector, and a collection filter. To collect a sample, extractive particles can be deposited onto a sample present on a substrate. At least a portion of the sample becomes coupled to a portion of the extractive particles to form sample particles. High-pressure gas can be discharged at the sample, thereby aerosolizing a portion of the sample particles to disperse aerosolized sample particles. A portion of the aerosolized sample particles can be collected onto a collection filter to form a collected sample.