Composite Chromatography Particles for High-pH Stability and Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chromatographic separation technologies face challenges with silica-based stationary phases that dissolve at high pH, leading to column failure, and polymer-based alternatives have limitations in column efficiency, especially for small molecules.
Innovation Solution
Superficially porous composite particles with a non-porous polymer core, a non-porous hybrid organic-inorganic material, and a porous inorganic material, which provide stability at prolonged high pH exposure, reducing silica core dissolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silica-based stationary phases are used, then stability at neutral pH and high temperature is improved, but stability at high pH deteriorates due to particle erosion caused by dissolution
Solution Approach 1:
The patent employs a composite particle structure consisting of a non-porous silica core coated with a hybrid organic-inorganic shell layer. This composite design combines the thermal stability of silica with the high pH resistance of organic-inorganic hybrid materials, resolving the contradiction between temperature stability and high pH stability.
Solution Approach 2:
The patent applies different material properties to different regions of the particle: the inner core maintains non-porous silica for thermal stability, while the outer shell layer provides hybrid organic-inorganic composition for high pH resistance. This local differentiation of material quality allows simultaneous optimization of both pH and temperature stability.
2Reliability
If polymer-based stationary material is used, then high pH stability is improved, but column efficiency deteriorates especially in the separation of small molecules
Solution Approach 1:
The patent creates a superficially porous structure where the outer shell layer contains controlled porosity to enhance efficiency for small molecule separation, while the inner core provides structural integrity and high pH stability. This local differentiation of porosity and material composition resolves the contradiction between pH stability and column efficiency.
Solution Approach 2:
The patent incorporates a porous shell layer with controlled pore structure that enables efficient separation of small molecules while maintaining high pH stability. The porous structure provides increased surface area and improved mass transfer, resolving the efficiency limitation of polymer-based materials.
3Reliability
If superficially porous particles with hybrid organic-inorganic coating are used, then high pH stability is improved, but column failure occurs due to solid silica core dissolution after prolonged high pH exposure
Solution Approach 1:
The patent applies a protective hybrid organic-inorganic shell layer beforehand to shield the silica core from high pH dissolution. This protective coating acts as a barrier that prevents direct contact between the silica core and harsh high pH mobile phases, extending column lifespan while maintaining high pH stability.
Solution Approach 2:
The patent creates a composite structure where the hybrid organic-inorganic shell material provides chemical resistance to high pH environments, protecting the inner silica core from dissolution. This composite design extends the operational lifespan of the column under prolonged high pH conditions.
Data Source
AI summary
The present disclosure pertains to composite particles with polymer-based cores, which eliminate the high pH failure mechanism of silica-based core-shell silica particles. In various embodiments, a non-porous polymer core is surface modified. In various embodiments, a non-porous hybrid organic-inorganic material is in contact with the modified surface of the core, and a porous inorganic material is in contact with the non-porous hybrid organic-inorganic material. The present disclosure pertains to chromatographic separation devices that comprise such composite particles.