Swellable Sol-Gel Compositions for Non-Polar Sorbate Extraction
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Solution Overview
Problem
Existing sol-gel compositions are not capable of significant swelling in response to non-polar sorbates, limiting their applications in chemical sensing, remediation, and extraction technologies.
Innovation Solution
A method of preparing swellable sol-gel compositions by derivatizing bridged polysiloxane sol-gels with reactive reagents containing alkyl groups, allowing them to swell up to ten times their dried volume when exposed to non-polar sorbates, and using these compositions in actuators, detectors, and remediation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sol-gel compositions are fully dried to achieve physical rigidity, then mechanical strength is improved, but swelling capability deteriorates
Solution Approach 1:
The patent applies preliminary action by derivatizing the sol-gel composition with hydrophobic groups before the drying process. This pre-modification prevents excessive crosslinking and maintains swelling capability while achieving adequate mechanical strength after drying. The derivatization occurs during gelation, before the material is fully dried, allowing the hydrophobic groups to be incorporated into the matrix structure in advance.
Solution Approach 2:
The patent changes the chemical composition parameter by incorporating hydrophobic groups (such as alkyl chains or fluorinated groups) into the sol-gel matrix. This compositional modification alters the interaction between the gel matrix and non-polar sorbates, enabling swelling in fully dried materials. The parameter change transforms the material from a traditional rigid zerogel to a swellable composition with tailored hydrophobicity.
2Ease of manufacture
If conventional sol-gel materials are used, then manufacturing simplicity is maintained, but swelling response to non-polar sorbates is insufficient
Solution Approach 1:
The patent creates a composite material by combining sol-gel precursors with hydrophobic modifiers (such as alkylsilanes or fluorosilanes). This composite approach integrates the swelling functionality into the sol-gel matrix itself, maintaining the ease of manufacture through standard sol-gel processing while achieving substantial swelling capacity (up to 10 times dried volume) in response to non-polar sorbates.
3Adaptability or versatility
If amine-bridged silane precursors are used to achieve swelling, then some swelling capability is obtained, but swelling extent is limited
Solution Approach 1:
The patent changes the chemical composition parameter by incorporating hydrophobic groups (such as alkyl chains or fluorinated groups) into the sol-gel matrix. This compositional modification alters the interaction between the gel matrix and non-polar sorbates, enabling swelling in fully dried materials. The parameter change transforms the material from a traditional rigid zerogel to a swellable composition with tailored hydrophobicity.
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 sol-gel compositions effectively swell in response to non-polar sorbates, enabling enhanced chemical sensing, efficient remediation of chemical spills, and selective extraction of non-polar components from biphasic liquids and vapor streams, with reversible swelling behavior and recyclable properties.
Implementation Method 1
derivatizing the residual silanols in the sol-gel with a reagent having at least one group that is reactive with the residual silanols and at least one alkyl group
Implementation Method 2
capable of swelling in the presence of a non-polar sorbate to at least 1.5 times their original volume
Data Source
AI summary
The present invention relates to a method of making a swellable sol-gel composition that involves the use of a bridged silane precursor. The resulting sol-gel includes residual silanols, which are derivatized with a reagent having at least one silanol-reactive group and at least one alkyl group; and the sol-gel is then dried. Sol-gels of the invention are demonstrated to swell up to about 8-10 times their original volume in the presence of a non-polar sorbate. The sol-gel compositions can be used in a sorbate-activated actuator or in a detector for non-polar sorbates. The sol-gel compositions can further be used to take up non-polar sorbates for purposes of chemical remediation, extraction from aqueous systems or vapor, and chemical sensing.