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Preparation of Alumina Aerogels with Sol-Gel Method by Ambient-dried Technique

Author: MaJianWei
Tutor: SunQingChi
School: Tianjin University
Course: Inorganic non-metallic materials
Keywords: Aerogel Atmospheric pressure drying method Ultrasonic wave Nanomaterials
CLC: TQ427
Type: Master's thesis
Year: 2009
Downloads: 105
Quote: 1
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Abstract


Alumina airgel is a lightweight , porous , amorphous bulk nanocrystalline materials , continuous three-dimensional network structure on the nanometer scale control and tailoring . Because of its unique network structure , in basic research , the low-temperature thermal properties of aerogels has become the forefront of today 's condensed matter physics . In the application, the airgel has been used in the catalyst and catalyst carrier , a gas filter material . Therefore, the airgel has important theoretical value and broad application prospects . This experiment in order to inorganic aluminum salt Jiushui and aluminum nitrate ( Al ( NO3 ) 3.9 H2O ) as precursors and ethanol as the solvent to the carboxamide dry chemical control agent as a catalyst , propylene oxide as a network -inducing agent , hydrochloric acid and ammonia and control PH value , hydrochloric acid and ammonia after the sol - gel process , the use of ambient drying , lightweight nanoporous materials Al2O3 airgel prepared . Thesis sol - gel process , the amount of ethanol , network inducer amount of propylene oxide , the amount of dry chemical control agents formamide , surface modification , and the pH value of the airgel ; discuss the sol - gel reaction Mechanism of Al2O3 airgel surface chemistry and surface chemical modification of the surface modifier of trimethylchlorosilane ( TMCS ) mechanism , TMCS is a polar group (-OH) on the surface of the wet gel shift into a - Si ( CH3 ) 3 , to effectively prevent shrinkage or collapse of the the airgel skeleton of the drying process ; preliminary study on the effects of acceleration of the ultrasound on the the gel solvent exchange surface modification . Through experiments to determine the optimum conditions of Al2O3 wet gel prepared at room temperature , the volume ratio V ( ethanol ) : V ( propylene oxide ) : V ( carboxamide ) 23:0.8:6 ultrasonic surface modification phase V ( trimethylchlorosilane ) : V ( ethanol ) is 1:9 . By scanning electron microscopy ( SEM ) , BET surface area tester and infrared spectral analysis means massive airgel structure and nano- powder products were characterized . The results showed that the Al2O3 aerogels is obtained by drying at atmospheric pressure with a multi- orifice , and a narrow pore size distribution , large specific surface area , amorphous solid material having a nano- network structure .

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Colloid and hemicolloid substances
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