Hybrid Nanoparticle Chromatography Materials
Solution Overview
Problem
Existing chromatographic materials for liquid chromatography face challenges such as low efficiency, inadequate separation performance, especially with low molecular-weight analytes, and issues like shrinking and swelling with changes in mobile phase composition. Additionally, silica-based stationary phases suffer from residual silanol group activity and hydrolytic instability.
Innovation Solution
The development of composite materials comprising nanoparticles dispersed within a hybrid material derived from an organosilyl repeat unit and an inorganic repeat unit, which provides enhanced mechanical strength, thermal properties, and controlled pore structure, thereby improving chromatographic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic materials are used for chromatography, then chemical stability against strongly alkaline and acidic mobile phases is improved, but column efficiency and separation performance deteriorate
Solution Approach 1:
The patent employs composite materials consisting of inorganic particles (silica, alumina, or titania) coated with organic polymer materials. This composite structure combines the chemical stability of organic materials with the high efficiency and mechanical strength of inorganic materials, resolving the contradiction between chemical stability and column efficiency
Solution Approach 2:
The invention merges inorganic and organic materials into a single chromatographic packing material. The inorganic core provides structural integrity and efficiency, while the organic coating provides chemical stability, achieving both requirements simultaneously
2Adaptability or versatility
If organic chromatographic materials are used, then flexibility in mobile phase pH choice is improved, but mechanical strength and dimensional stability deteriorate
Solution Approach 1:
The composite structure with inorganic core and organic coating provides both the mechanical strength of inorganic materials and the chemical versatility of organic materials, allowing wide pH range compatibility while maintaining dimensional stability
Solution Approach 2:
The organic coating is applied only on the surface of the inorganic particles, providing pH flexibility where needed (at the stationary phase-mobile phase interface) while the bulk inorganic material provides mechanical strength and dimensional stability
3Manufacturing precision
If silica-based stationary phases are used, then column efficiency is improved, but hydrolytic instability and silanol group activity worsen
Solution Approach 1:
The harmful residual silanol groups on the silica surface are removed or neutralized by coating the silica particles with organic polymer materials. This extraction of the problematic surface groups eliminates hydrolytic instability and silanol activity while preserving the high efficiency of the silica core
Solution Approach 2:
The organic polymer coating acts as an intermediary layer between the silica core and the mobile phase, preventing direct interaction between silanol groups and analytes/mobile phase components that would cause hydrolysis or unwanted adsorption
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 use of these composite materials results in higher column efficiency, improved mechanical strength, and enhanced chromatographic selectivity, addressing the limitations of traditional chromatographic materials.
Implementation Method 1
nanoparticles distributed throughout the skeletal matrix of the polymer network
Implementation Method 2
The condensation is carried out hydrolytically
Implementation Method 3
condensing the dispersion mixture hydrolytically to give a condensed polyoligomeric organosiloxane
Data Source
Figure 1
Figure 2
AI summary
Novel porous materials comprising nanoparticles, use in chromatographic separations, processes for its preparation, and separations devices containing the chromatographic material are described by the instant invention. In particular, the disclosure describes porous inorganic/organic hybrid particles embedded with nanoparticles selected from oxides or nitrides of the following: silicon carbide, aluminum, diamond, cerium, carbon black, carbon nanotubes, zirconium, barium, cerium, cobalt, copper, europium, gadolinium, iron, nickel, samarium, silicon, silver, titanium, zinc, boron, and mixtures thereof.