Radial Diffusion Sampler with Hydrophobic Membrane
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Solution Overview
Problem
Existing radial symmetry diffusion samplers fail to prevent or reduce the adsorption of interfering substances like steam and ozone, which can saturate adsorbing media and interfere with the detection of volatile pollutants, making sampling difficult or impossible, especially at low concentrations.
Innovation Solution
A radial symmetry diffusion sampling device with an external permeation membrane, such as a stainless steel tubular membrane coated with a hydrophobic material, reduces interference by allowing volatile substances to diffuse through while minimizing the adsorption of interfering substances, and features a removable adsorbing cartridge for easy extraction and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If diffusion samplers are used to sample volatile substances, then energy consumption is eliminated and sampling cost is reduced, but interfering substances like steam are adsorbed and saturate the adsorbing medium, preventing detection of volatile substances
Solution Approach 1:
The sampling device is segmented into distinct functional zones: an external permeation membrane layer and an internal adsorption cartridge. This segmentation allows the membrane to selectively filter out interfering substances (steam, ozone) before they reach the adsorbing medium, while permitting volatile organic compounds to pass through and be captured. The segmentation resolves the contradiction by separating the functions of interference rejection and analyte capture.
Solution Approach 2:
The external permeation membrane acts as an intermediary between the ambient air and the adsorbing medium. It selectively permits certain molecules (VOCs) to pass while blocking others (steam, ozone). This intermediary function resolves the contradiction by preventing interfering substances from saturating the adsorbing medium, thereby maintaining detection capability without requiring energy-consuming active sampling systems.
2Productivity
If radial symmetry devices are used, then sampling flow rate is increased, but interfering substances are still adsorbed and interfere with detection
Solution Approach 1:
The radial symmetry device is segmented with an external permeation membrane surrounding the adsorption cartridge. This segmentation enables the device to maintain high sampling flow rates characteristic of radial symmetry designs while the membrane selectively removes interfering substances, preserving detection capability despite the increased flow rate.
Solution Approach 2:
Different regions of the device have different functional qualities: the external membrane has selective permeability properties that allow VOCs to pass while blocking steam and ozone, while the internal cartridge has high adsorption capacity. This local differentiation of qualities allows the device to achieve both high flow rate and high detection precision simultaneously.
3Adaptability or versatility
If internal casing with conversion reactant is used, then substance conversion is achieved, but extraction complexity increases and time is wasted
Solution Approach 1:
The adsorption cartridge is designed as a removable, extractable component that can be easily removed from the sampling device without requiring emptying of intermediate spaces or collection of solid conversion reactants. This extraction design resolves the contradiction by enabling rapid removal and analysis of the adsorbed sample, significantly reducing the time loss associated with complex extraction procedures while maintaining substance conversion capability.
Solution Approach 2:
The device is segmented into a permanent housing and a removable adsorption cartridge. This segmentation allows the cartridge containing the converted substances to be quickly extracted for analysis without requiring manipulation of the conversion reactant or emptying of intermediate spaces, thereby reducing extraction time while preserving conversion functionality.
4Adaptability or versatility
If internal casing with conversion reactant is used, then substance conversion is achieved, but device complexity increases for extracting internal casing
Solution Approach 1:
The adsorption cartridge is designed as a self-contained, easily extractable unit that can be removed from the sampling device without requiring complex disassembly or emptying of intermediate spaces. This extraction design resolves the contradiction by simplifying the extraction process while maintaining the substance conversion capability provided by the conversion reactant.
Solution Approach 2:
The device is segmented into a permanent housing containing the conversion reactant and a removable adsorption cartridge. This segmentation reduces device complexity for extraction by allowing the cartridge to be removed as a single unit without requiring manipulation of the conversion reactant or emptying of intermediate spaces, while still achieving substance conversion.
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 achieves high sampling flow rates and sensitivity, allowing detection of pollutants at low concentrations (0.1 mg/m³) with reduced interference, and facilitates easy handling and analysis through thermal or chemical desorption, minimizing contamination risks and sample handling complexity.
Implementation Method 1
the volatile substance molecules are diffused from the air of the contaminated external environment to the internal space of the sampling device, permeating through a stainless steel or other metallic material tubular membrane
Implementation Method 2
permeating through a stainless steel or other metallic material tubular membrane possibly coated with a suitable material, such as for example an hydrophobic material
Implementation Method 3
they are finally collected by the adsorbing material arranged inside a cartridge coaxial and internal to said membranes
Data Source
Figure 1~4
Figure 5~8
AI summary
Sampling device for volatile polluting substances by radial symmetry diffusion which, in addition to allowing high sampling flow rates, allows to either prevent or considerably reduce the adsorption of some substances, such as for example steam or ozone, potentially interfering with the detection of said polluting substances. A further object of the sampling device of the invention is to allow a rapid and simple extraction of the adsorbing cartridge from the device.