Modular Gas Chromatography Substrate Connection for High-Temperature Stability
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Solution Overview
Problem
Gas chromatography devices connected via capillaries face challenges with high-temperature stability and reversible connection issues, leading to sample retention and adhesion problems, and existing solutions are not compatible with high-temperature operations.
Innovation Solution
A chromatography device design featuring a functional substrate with a channel coated by a stationary phase, connected to a modular connection substrate via capillaries, allowing for easy substitution and using thermal insulation and cooling systems to manage temperature stress, ensuring leak-tight fluid flow and reducing adhesive stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capillaries are connected to chromatography column using common adhesives, then ease of manufacture and connection simplicity are improved, but reliability and high-temperature stability deteriorate above 200°C
Solution Approach 1:
The device is divided into modular components: a functional substrate containing the chromatography column, a separate connection substrate with capillary connection zones, and a holding means that temporarily assembles them. This segmentation allows the capillaries to be connected to the connection substrate using simple adhesives at low temperatures, while the functional substrate can be heated to high temperatures without compromising the adhesive bonds, thus resolving the contradiction between ease of manufacture and high-temperature reliability.
2Adaptability or versatility
If capillaries are used to connect chromatography column, then adaptability and ease of operation are improved, but sample retention and adsorption on capillary walls occur
Solution Approach 1:
The connection substrate is extracted as a separate component that can be selectively functionalized or left unfunctionalized. By using a dedicated connection substrate rather than directly functionalizing capillary walls, the system maintains adaptability while providing an option to minimize sample retention through proper substrate selection or treatment.
Solution Approach 2:
The connection substrate acts as an intermediary between the capillaries and the chromatography column. It provides a transition zone that can be optimized for connection purposes without necessarily requiring the same functionalization as the chromatography column, thereby reducing unwanted sample adsorption while maintaining connection flexibility.
3Device complexity
If connection substrate is integrated with functional substrate, then device complexity is reduced, but ease of repair and substrate replacement capability deteriorate
Solution Approach 1:
The device is segmented into a functional substrate and a connection substrate that are physically separate but temporarily assembled via holding means. This segmentation maintains relatively simple device structure while enabling easy replacement of either substrate independently, thus resolving the contradiction between structural simplicity and repairability.
Solution Approach 2:
The holding means provides a dynamic, reversible connection between the functional substrate and connection substrate. This dynamic assembly allows the substrates to be easily separated and replaced when needed, maintaining ease of repair and substrate replacement capability while keeping the overall device structure relatively simple during operation.
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 reversible and simple connections of capillaries to chromatography columns, maintains analysis accuracy by minimizing sample retention, and allows operation at high temperatures using common adhesives, reducing the need for frequent capillary bonding and substrate changes.
Implementation Method 1
application of a mechanical pressure to hold the first face (5) of the functional substrate (1) against the first face (7) of the connection substrate (9)
Implementation Method 2
The installation of the seals in the trenches makes it possible to ensure the tightness of the chromatography device
Implementation Method 3
a channel (3) extending between a first and a second orifice (3-1, 3-2) opening onto a first face (5) of the functional substrate (1), the channel comprising an internal wall covered with a functionalization layer
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4C
AI summary
Chromatography device, comprising a functional substrate (1), comprising a channel (3) that extends between a first orifice (3-1) and a second orifice (3-2) that open onto a face (5) of the functional substrate; said face (5) of the functional substrate being positioned against a face (7) of a connection substrate (9), comprising a third orifice (7-1) and a fourth orifice (7-2) that open onto said face (7) of the connection substrate, so that the first (3-1) and second (3-2) orifices are positioned respectively opposite the third (7-1) and fourth (7-2) orifices; the connection substrate being connected to a first capillary (11) and a second capillary (13), the connection substrate comprising a first fluidic circuit (15) extending between the first capillary and the third orifice and comprising a second fluidic circuit (17) extending between the second capillary and the fourth orifice; and a holding means (19, 21) suitable for temporarily holding said face (5) of the functional substrate bearing against said face (7) of the connection substrate, so as to allow the leaktight passage of a fluid between the first and second capillaries, through the first and second fluidic circuits and the channel.