Swab-Based Ionized Sample Introduction for Non-Volatile Detection
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Solution Overview
Problem
Existing chemical detection systems, particularly Ion Mobility Spectrometry (IMS) and Mass Spectrometry (MS), struggle with the detection of non-volatile materials as they either decompose under thermal desorption or require vacuum conditions, limiting their standalone functionality and portability.
Innovation Solution
A novel sample preparation technique using a swab holder/positioner that adds a solvent to dissolve trace chemicals, charges the swab to create an ionized analyte, and positions it to direct the ionized plume into the detection instrument, combining sample introduction and ionization in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If thermal desorption is used to introduce samples into IMS system, then volatile materials can be detected, but non-volatile materials decompose rather than desorb
Solution Approach 1:
The patent changes the fundamental parameter of sample introduction from thermal desorption to direct vaporization. Instead of heating the sample to release volatiles, the system vaporizes the sample directly through controlled heating at lower temperatures or through laser desorption, preserving non-volatile materials while enabling their detection in the IMS system.
Solution Approach 2:
The patent replaces the mechanical thermal desorption process with a direct vaporization approach. Rather than using heat to mechanically strip volatiles from a substrate, the system directly vaporizes the sample material, eliminating the decomposition issue that occurs with non-volatile compounds under thermal stress.
2Measurement precision
If Mass Spectrometry is used for chemical detection, then detection precision is improved, but vacuum conditions are required which limit portability
Solution Approach 1:
The patent merges the advantages of IMS (atmospheric pressure operation, portability) with the detection capabilities needed for precise analysis. By using direct vaporization to introduce samples into an IMS system operating at atmospheric pressure, the system achieves reliable detection without requiring complex vacuum systems, thus maintaining portability while preserving detection precision.
Solution Approach 2:
The patent extracts the essential function of sample vaporization from the complex vacuum-based MS system and implements it in a simplified atmospheric pressure IMS configuration. This extraction allows the system to achieve comparable detection precision without the burden of vacuum requirements, improving portability.
3Ease of operation
If standalone IMS functionality is maintained, then portability is preserved, but integration with MS loses independent detection capability
Solution Approach 1:
The patent makes the IMS system universal by enabling it to detect both volatile and non-volatile materials through direct vaporization. This multi-functional capability allows the standalone IMS device to perform comprehensive chemical detection without requiring MS integration, preserving portability while enhancing detection versatility.
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 the detection of non-volatile compounds without decomposition, maintaining portability and efficiency, and improves detection reliability and speed in security screening.
Implementation Method 1
adding a solvent to the swab to better dissolve and release any trace chemicals contained on the swab
Implementation Method 2
charging of the solvated swab to create an ionized analyte prior to entry into the detection instrument
Implementation Method 3
Mixing these stable reactant ion clusters with vapor samples to be analyzed can result in ionization of the sampled materials, thus forming ion clusters characteristic of the sample material. A small cloud of formed ions is guided by an electromagnetic field through a drift tube towards a detector
Data Source
AI summary
The present disclosure describes an improved sample preparation technique, swab, swab holder and solvent for the removal of trace chemical materials from swabs and delivery of the trace materials into a mass spectrometer (MS) or an ion mobility spectrometer (IMS). The devices and techniques aid the delivery of the analyte into the instrument inlet and concurrently serves as an ionization source. The technique includes the steps of positioning or shaping the swab so that a pointed analyte release area is directed toward the inlet of the MS or IMS, adding a solvent to the swab and charging the swab to create an ionized analyte spray (Taylor Cone spray) into the inlet of the detection instrument. Solvent may include a chemical for depressing the ionization of residual solvent or enhancing the ionization of the desired analyte and this chemical may serve as an internal standard or benchmark.