Superpolar Sol-Gel Sorbent Network for Highly Polar Analyte Extraction
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Solution Overview
Problem
Poly(ethylene glycol) has insufficient polarity for the absorption and analysis of highly polar analytes, and its immobilization on substrates is challenging due to limited chemical linkage and solvent instability, requiring long extraction times and limited thermal stability.
Innovation Solution
A sol-gel network of metal oxide precursors condensed with polyhydroxy molecules, such as sucrose, is created to form a superpolar sorbent network that provides adjustable porosity, tunable selectivity, high thermal stability, and solvent stability, allowing for effective immobilization and analysis of highly polar analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If poly(ethylene glycol) is used as a polar polymer for immobilization on substrate surface, then the substrate can be used as stationary phase for chromatographic separations and as extraction sorbents, but the polarity is insufficient for absorption and analysis of highly polar analytes
Solution Approach 1:
The patent changes the chemical composition parameters by replacing poly(ethylene glycol) with polyhydroxy molecules containing multiple hydroxyl groups (such as sucrose, sorbitol, or glucose). This parameter change increases the polarity of the stationary phase, enabling effective interaction with highly polar analytes through enhanced hydrogen bonding and dipole-dipole interactions.
Solution Approach 2:
The patent creates a composite material by integrating polyhydroxy molecules into a sol-gel matrix. This composite structure combines the high polarity and hydrogen bonding capability of polyhydroxy molecules with the mechanical stability and porosity control of the sol-gel network, achieving both high polarity and structural integrity.
2Strength
If a thin coating of poly(ethylene glycol) is deposited on substrate surface followed by free-radical cross-linking, then the coating is anchored to the surface, but the sorbent coating is vulnerable to being washed out by organic solvents and cannot withstand high temperature
Solution Approach 1:
The patent replaces the free-radical cross-linking mechanism with a sol-gel condensation process. Instead of forming a mesh-like network through radical reactions, the sol-gel process creates an inorganic-hybrid organic-inorganic polymeric network through condensation of metal oxide precursors with polyhydroxy molecules, providing superior chemical and thermal stability.
Solution Approach 2:
The patent employs a composite material consisting of polyhydroxy molecules embedded in a sol-gel matrix. This composite structure provides both the polarity needed for analyte interaction and the thermal-solvent stability characteristic of inorganic sol-gel networks, overcoming the limitations of pure organic polymer coatings.
3Reliability
If poly(ethylene glycol) is used as sorbent coating, then target analytes can be retained via dissolution, but the dissolution process in highly viscous solid is slow requiring long extraction time to reach equilibrium
Solution Approach 1:
The patent utilizes the porous structure of the sol-gel matrix to enhance mass transfer. The porous network provides numerous access pathways for analytes to reach the polyhydroxy binding sites, significantly reducing extraction time while maintaining high retention capability through multiple interaction mechanisms including hydrogen bonding and dipole-dipole interactions.
4Reliability
If poly(ethylene glycol) is used for highly polar analyte analysis, then the polymer provides polar interaction, but the limited polarity remains a problem when employed to target very highly polar analytes
Solution Approach 1:
The patent changes the polarity parameter by selecting polyhydroxy molecules with multiple hydroxyl groups (such as sucrose with 8 hydroxyl groups, sorbitol with 6 hydroxyl groups) instead of poly(ethylene glycol). This increases the hydrogen bonding capability and overall polarity, enabling selective interaction with very highly polar analytes that cannot be effectively retained by conventional poly(ethylene glycol) phases.
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 superpolar sorbent network enables efficient absorption and analysis of polar analytes through multiple interaction mechanisms, improving extraction efficiency and stability, particularly for highly polar compounds that are difficult to isolate and concentrate using existing sorbents.
Implementation Method 1
at least one metal oxide precursor, at least one polyhydroxy molecule, water, a catalyst, and, optionally, a solvent are combined for the hydrolysis of the precursors to a sol that upon condensing the hydrolyzed metal oxide precursors and the polyhydroxy molecules, the superpolar sorbent network forms
Implementation Method 2
the hydrolyzed metal oxide precursors and the polyhydroxy molecules, the superpolar sorbent network forms
Implementation Method 3
Bound poly(ethylene glycol) behaves like a pseudo-liquid that retains target analytes via dissolution
Implementation Method 4
retains target analytes via dissolution
Data Source
AI summary
A superpolar sorbent network is a sol-gel network of at least one metal oxide precursor condensed and at least one polyhydroxy molecule. The metal oxide precursor is a silicate precursor, aluminate precursor, titanate precursor, zirconate precursor, germinate precursor, or any combinations thereof, and the polyhydroxy molecule has a multiplicity of hydroxyl groups. The polyhydroxy molecule can be an organic molecule derived from nature. The superpolar sorbent network can be used as a particulate or bulk sorbent for sampling or removal of analytes or contaminants from an environment or can be coated on a tube or particulate substrate for use as a chromatographic stationary phase.