Porous Monolith Integration in Capillary for Solid-Phase Extraction
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Solution Overview
Problem
Existing methods for solid-phase extraction of compounds of interest from complex mixtures are inefficient and non-reproducible, especially for samples of small volumes, due to issues with the integrity and leaktightness of porous monoliths in miniaturized formats.
Innovation Solution
A process involving the incorporation of a self-supporting porous monolith with hierarchical porosity into a fluidic conduit, allowing for efficient extraction of compounds by ensuring the monolith acts as a filter within the conduit, while maintaining the monolith's integrity and leaktightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a porous monolith is miniaturized to treat small sample volumes, then the device becomes compatible with reduced sample amounts and faster analysis, but the monolith integrity and leaktightness cannot be retained
Solution Approach 1:
The porous monolith is nested within a capillary tube structure, where the monolith occupies the internal space of the capillary. This nesting approach provides mechanical support to the miniaturized monolith while maintaining leaktightness, resolving the contradiction between miniaturization and structural integrity.
Solution Approach 2:
A flexible sealing structure is introduced at the interface between the monolith and capillary walls. This thin film or shell component adapts to the capillary geometry and provides leaktight sealing without compromising the monolith's porous structure or requiring larger dimensions.
2Ease of manufacture
If a porous monolith with large width is used, then manual embedding and heat-shrinkable tube encapsulation can be achieved, but the device requires large sample volumes and complex control mechanisms
Solution Approach 1:
The monolith dimensions are changed to a small diameter (≤3 mm) that is specifically optimized for capillary compatibility. This parameter change enables the monolith to be used in miniaturized formats while maintaining ease of manufacture through standardized capillary integration procedures.
Solution Approach 2:
The traditional mechanical embedding and heat-shrinkable tube encapsulation methods are replaced with a capillary-based integration system. The capillary structure provides both mechanical support and sealing functions that were previously achieved through complex external encapsulation, eliminating the need for large monolith dimensions.
3Volume of moving object
If in situ formation of HPM in capillaries is performed, then miniaturization is achieved, but porosity gradients and incomplete anchoring harm reproducibility
Solution Approach 1:
The capillary structure is prepared in advance with specific surface treatments or coating layers that promote uniform monolith formation and complete anchoring. This preliminary preparation ensures that when the monolith is formed (either in situ or pre-formed), it achieves uniform porosity and complete attachment to the capillary walls, eliminating reproducibility issues.
Solution Approach 2:
The capillary internal surface is modified with localized properties (such as adhesive coatings or surface roughness variations) that enhance monolith anchoring at critical interfaces. This local quality improvement ensures complete anchoring without requiring changes to the overall monolith formation process, maintaining porosity uniformity while achieving secure attachment.
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 enables rapid, robust, and reproducible extraction of compounds from small sample volumes, optimizing subsequent analysis and maintaining the integrity of the porous monolith.
Implementation Method 1
using a heat-shrinkable tube which, when it is heated at 100° C. for 10 minutes, retracts onto the HPM to encapsulate it and to hold it in position
Implementation Method 2
porous monoliths, in particular those having a hierarchical porosity (HPM), exhibit advantages such as a good permeability, a porosity and a surface chemistry which is adjustable
Implementation Method 3
The extraction of one or more compounds of interest from a complex mixture is essential for subsequent use
Data Source
AI summary
A method for solid-phase extraction and/or separation of one or more compounds of interest from a liquid sample which including: integrating a self-supporting porous monolith in a fluid duct wherein the self-supporting porous monolith is stationary in the fluid duct during the method and forms a filter in the fluid duct; passing the sample at least once through the porous monolith in the fluid duct over at least one portion of the porous monolith, the self-supporting porous monolith having a largest dimension less than or equal to 3 mm transverse to the fluid duct, the fluid duct having one or more open ends prior to integration, the or at least one of the ends remaining open during the step of integrating the porous monolith.