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Method for fabricating aerogels and their application in biocomposites

a biocomposites and aerogel technology, applied in the field of aerogel fabrication, can solve the problems of inability to fabricate biocomposites or bio-wrapping materials, high temperature and pressure conditions of supercritical fluid, and brittle structure, etc., and achieves easy separation, easy preparation, and easy recycling

Inactive Publication Date: 2009-05-14
CHUNG YUAN CHRISTIAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]One object of the present invention is to use ionic liquids with different properties and to control their added amount so as to adjust the pore diameter and specific surface area of aerogel. Since the ionic liquid has the characteristics of non-volatility, non-ignitibility, easy preparation, easy separation, and easy recycling, it can replace organic solvents and traditional supercritical fluid processes to thereby satisfy the trend of environmental protection.

Problems solved by technology

However, the only drawback is that its structure is very brittle.
However, the temperature and pressure conditions for supercritical fluid are very harsh.
These conditions are not suitable for fabricating biocomposite or bio-wrapping materials.
Besides, the procedures for supercritical fluid treatment are very complicated and minute and the operating process may cause explosion.

Method used

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first embodiment

[0018]In the present invention, a method for fabricating an aerogel is provided. At first, a precursor solution is provided and the precursor solution comprises an ionic liquid, a catalyzed hydrolysis and / or condensation reagent, and at least one alkoxide monomer and / or aryloxide monomer. The ionic liquid is used as a template as well as a solvent. The central element of the alkoxide monomer and / or aryloxide monomer comprises one selected from the group consisting of the following: Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Ti, Te, Cr, Cu, Er, Fe, Ta, V, Zn, Zr, Al, Si, Ge, Sn, and Pb. The common alkoxide monomer and / or aryloxide monomer comprises one selected from the group consisting of the following: tetramethyl orthosilicate (TMOS), tetraethoxy orthosilicate (TEOS), bis(triethoxysilyl)ethane (BTSE), bis(triethoxysilyl)benzene (BTSB), tetrabutyl titanate (TBOT), and vanadium oxytriproposide. The catalyzed hydrolysis and / or condensation reagent comprises one selected from the group co...

second embodiment

[0029]In the present invention, a method for fabricating surface modified aerogel is provided. At first, an precursor solution is provided and the precursor solution comprises at least one alkoxide monomer and / or aryloxide monomer, a catalyzed hydrolysis and / or condensation reagent, an ionic liquid, and an alkoxide monomer and / or aryloxide monomer with at least one specific moiety. The ionic liquid is used as a template as well as a solvent. The specific moiety comprises one selected from the group consisting of the following: carboxyl group, mercapto group, amino group, diamino group, alkyl group (such as methyl group), aryl group (such as phenyl group), epoxy group, and cyano group. The catalyzed hydrolysis and / or condensation reagent comprises one selected from the group consisting of the following or any combination of the following: alcohol (the number of carbon is less than or equal to 5), acidic compound, and alkaline compound. Thus, the reagent catalyzes the hydrolysis and c...

third embodiment

[0041]In the present invention, a method for fabricating biocomposite is disclosed. Biocomposite can be applied in variety of fields, such as immobilized enzyme, drug controlled release, bio-separation technique, and sensors, etc.

[0042]The definition of “immobilized enzyme” is that enzyme is confined in a specific region but its active site is not hindered so that enzyme can be repeatedly used and continuously operated to thereby reduce the usage of the enzyme and to be effectively separated from the final product. There are numerous methods to immobilize enzyme, generally such as adsorption method, ionic bonding method, covalent bonding method, crosslinking method, and embedding method. Among these, since the covalent bonding method, fixing enzyme on a support, has the advantages of intense bonding force and high stability, it is the most common method for immobilizing enzyme. The immobilized enzyme has many advantages, such as being reusable, being quickly separated from the produ...

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Abstract

The present invention discloses a method for fabricating aerogels, a method for fabricating surface-modified aerogels, and a method for fabricating biocomposites. Take the fabricating method of biocomposites for example, first, a precursor solution is provided and the precursor solution comprises a hydrophilic ionic liquid, a catalyzed hydrolysis and / or condensation reagent, at least one biomolecule. Next, a curing process is performed for the precursor solution to hydrolyze and polymerize the at least one alkoxide monomer and / or aryloxide monomer to wrap at least one biomolecule and thus form biocomposite. Afterwards, an extracting process is performed by a solvent for the biocomposite to substitute the ionic liquid in the biocomposite. Finally, a drying process for the biocomposite is carried out after the extracting process so as to remove the solvent in the biocomposite. Therefore, the biocomposite is formed.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is generally related to a method for fabricating aerogels, and more particularly to a method utilizing an ionic liquid for fabricating aerogels and their applications in biocomposites.[0003]2. Description of the Prior Art[0004]Aerogel is very light weighted. Aerogel is also called “frozen smoke”, because its density can be as low as 0.003 g / cm3. It is a species of solid with very slim skeleton because its porosity can be as high as 99.9%. The solid is filled with air and thus called “aerogel”. It has a pore network structure and very high specific surface area to hold 1600 times its weight. However, the only drawback is that its structure is very brittle.[0005]Almost all of the applications of aerogel are related to the network structure with porosity higher than 90%. Aerogel has the characteristics of low density, low heat conductivity, low sound spreading speed, low dielectric constant and so for...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B33/158C12N11/14C07K17/14C07H21/00
CPCC01B33/1585C12N11/14C07D233/58C07D233/56
Inventor CHEN YANG, YUI-WHEILI, YEN-KUANGYUAN, CHING-YAOWU, TZONG-YUAN
Owner CHUNG YUAN CHRISTIAN UNIVERSITY
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