Wafer-Level Chromatography Chip With Anchored Monolithic Phase
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Solution Overview
Problem
Current miniaturized chromatography columns face challenges in achieving reliable and reproducible separation performance due to difficulties in filling porous stationary phases into microchannels, which often result in non-uniform distribution and mechanical instability, limiting their applicability in liquid chromatography.
Innovation Solution
The method involves creating miniaturized chromatography chips with separation channels embedded in the substrate, filled with a monolithic porous stationary phase that is chemically or mechanically anchored to the channel walls, using materials like metals, ceramics, or organically modified silicon, and sealing the channels to form a self-supporting three-dimensional structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manual packing methods are used to fill porous stationary phases into microchannels, then the stationary phase can be introduced into the column, but the distribution becomes non-uniform and mechanical instability occurs
Solution Approach 1:
The patent replaces manual mechanical packing operations with a chemical deposition process. The stationary phase is introduced as a sol solution that is deposited onto the substrate, allowing uniform distribution through liquid-phase transport rather than mechanical forcing of particles into narrow channels. This substitution eliminates the mechanical instability caused by improper packing while maintaining ease of manufacture through standard solution processing techniques.
Solution Approach 2:
The patent changes the physical state and form of the stationary phase from particulate (requiring mechanical packing) to sol form (liquid solution that can be deposited). This parameter change allows the stationary phase to be introduced uniformly through solution deposition methods, achieving both uniform distribution and mechanical stability without the difficulties of manual packing operations.
2Productivity
If miniaturized chromatography columns are fabricated, then sample consumption and separation time are reduced, but separation performance becomes unreliable and non-reproducible
Solution Approach 1:
The patent replaces mechanical packing operations with chemical deposition of the stationary phase from sol solutions. This substitution ensures uniform distribution and strong adhesion to the substrate, achieving reliable and reproducible separation performance in miniaturized columns while maintaining the productivity benefits of rapid separation and low sample consumption.
Solution Approach 2:
The patent creates a composite structure where the stationary phase is chemically bonded to the substrate surface. This composite approach ensures that the stationary phase remains firmly attached during the high-speed flow conditions of miniaturized chromatography, preventing degradation and ensuring reproducible performance while maintaining the speed advantages of miniaturization.
3Productivity
If wafer-level fabrication is used to produce miniaturized columns, then manufacturing efficiency is improved, but the complexity of achieving uniform stationary phase distribution increases
Solution Approach 1:
The patent replaces complex mechanical packing operations with simple solution deposition processes that are compatible with wafer-level fabrication. The sol solutions can be applied uniformly across multiple wafers simultaneously using standard semiconductor manufacturing techniques, achieving both high manufacturing throughput and uniform stationary phase distribution through liquid-phase transport and evaporation processes.
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 the production of reliable and reproducible miniaturized chromatography columns that can be quickly manufactured at the wafer level, with the stationary phase covering at least part of the column's cross-section, enhancing separation performance and reducing manual handling and time-consuming packing processes.
Implementation Method 1
filled with a monolithic precursor of the subsequent stationary phase, and—after the formation of pores in the stationary phase—sealing the channel structures. The separation columns obtained by these process steps have a self-supporting, three-dimensional structure firmly anchored to the substrate wall
Data Source
Figure 1~2C
AI summary
The present invention relates to a method for producing a miniaturized separation column for chromatographic purposes including a porous stationary phase anchored in the column, including the following steps: (a) preparing a fiat substrate of silicon, glass, glass ceramic or ceramic; (b) etching at least one channel structure into the fiat substrate; (c) introducing a non-porous precursor material for the porous stationary phase into at least one portion of the channel structure(s); (d) forming a porous, three-dimensional network from the precursor material; and (e) fluid-tight covering of the channel structure(s) on the top side of the flat substrate.