Metal LC Components with Vapor Phase Coating
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Solution Overview
Problem
Conventional metal components in liquid chromatography systems are prone to corrosion and interference with samples, especially in bio-analytical applications, due to leached metal ions, and existing solutions like PEEK materials are expensive, difficult to shape, and unable to withstand high pressures in UHPLC systems.
Innovation Solution
A vapor phase deposition process is used to create a continuous, uniform, and inert coating on metal components, including long and narrow channels, using molecular precursors that react and deposit on the interior surfaces, ensuring strong adhesion and compatibility with bio-analytical separations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal components are used in liquid chromatography systems, then mechanical strength and pressure resistance are improved, but corrosion and metal ion interference occur
Solution Approach 1:
The patent applies composite materials by combining metal components with inert coating materials (such as PEEK, polyimide, or other polymer coatings) to create a hybrid structure. The metal provides mechanical strength and pressure resistance, while the inert coating layer prevents corrosion and metal ion interference with samples. This composite approach allows the system to simultaneously achieve both mechanical durability and chemical inertness required for UHPLC applications.
2Object-affected harmful factors
If PEEK materials are used for flow paths, then corrosion resistance is improved, but ease of manufacture and adaptability worsen
Solution Approach 1:
Instead of forming PEEK into complex shapes (which is difficult), the patent inverts the approach by using metal components that are easily manufactured into various shapes and sizes, then coating them with inert material. This reversal maintains the corrosion resistance benefit while solving the manufacturing flexibility problem, as metal components can be precisely formed using conventional machining and fabrication techniques.
Solution Approach 2:
The patent uses composite materials where metal provides the structurally complex, easily manufacturable component, and the inert coating provides the corrosion resistance. This division of functions allows each material to play to its strengths: metal for mechanical form and strength, and coating for chemical inertness.
3Object-affected harmful factors
If PEEK materials are used for flow paths, then corrosion resistance is improved, but pressure resistance worsens
Solution Approach 1:
The patent employs composite materials where the metal substrate provides high pressure resistance (withstanding UHPLC pressures above 400 bar), while the inert coating layer provides corrosion resistance. The metal's superior mechanical properties compensate for the coating's limited pressure tolerance, creating a composite structure that achieves both corrosion resistance and high pressure resistance simultaneously.
4Ease of manufacture
If conventional coating methods are used on metal surfaces, then ease of manufacture is improved, but coating uniformity and adhesion worsen
Solution Approach 1:
The patent applies parameter changes by controlling coating process variables such as deposition conditions, coating thickness, and material composition to achieve uniform, adherent coatings on metal surfaces. By optimizing these parameters, the coating process produces consistent results with proper adhesion and uniformity, resolving the contradiction between ease of manufacture and manufacturing precision.
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 coated metal components are inert, resistant to corrosion, and capable of withstanding pressures over 1,000 bar, providing effective protection against metal ion interference and enabling efficient bio-analytical separations while being compatible with a wide range of solvents and pH levels.
Implementation Method 1
The protective coating is formed via a vapor phase process that includes: providing one or more molecular precursors in the gas phase; exposing an interior surface of the lumen, passageway or cavity to the one or more molecular precursors in the gas phase; allowing the one or more molecular precursors to react, decompose, condense or otherwise change at or near the exposed interior surface and subsequently depositing thereon
Implementation Method 2
allowing the one or more molecular precursors to react, decompose, condense or otherwise change at or near the exposed interior surface and subsequently depositing thereon
Data Source
AI summary
The invention provides metal liquid chromatography components with uniformly coated internal surfaces and methods for achieving the same. The invention addresses the problem of corrosion or interference of metal components in the flow path for LC analyses in which the sample interacts with metal ions or surfaces. The invention also alleviates the difficulties in coating very long metal tubes and very small metal channels with an inert, continuous coating that adheres well to metal surfaces. The metal flow path is rendered inert by the coating, and thus compatible with bioanalytical separations, for example, by using a vapor phase deposition process to coat the inner surfaces with a coating that continuously covers all metal surfaces in the flow path.