Continuous synthesis of high-surface-area aluminum hydroxide methoxide nano- and microparticles in supercritical methanol and their conversion into γ-Al2O3

Title
Continuous synthesis of high-surface-area aluminum hydroxide methoxide nano- and microparticles in supercritical methanol and their conversion into γ-Al2O3
Authors
Bambang Veriansyah수산티아궁민병권김재훈
Keywords
supercritical fluids; nanofluids; nanoparticles; Nano- and microparticles; Nanocrystalline materials; Supercritical methanol; Aluminum hydroxide methoxide; γ-Al2O3
Issue Date
2011-02
Publisher
Materials letters
Citation
VOL 65, NO 4, 772-774
Abstract
High-surface-area aluminum hydroxide methoxide (CH4Al2O4) nano- and microparticles are synthesized continuously in supercritical methanol (scMeOH). The properties of the particle synthesized in scMeOH are compared with those synthesized in supercritical water (scH2O). The XRD analysis reveals that the particles synthesized in scMeOH retain aluminum hydroxide methoxide crystalline structure while the particles synthesized in supercritical water retain boehmite (AlOOH) crystalline structure. Plate-shape particles are synthesized in scH2O while highly porous, flake-like particles are synthesized in scMeOH. Due to the porous structure, the CH4Al2O4 particles have much higher BET surface area (314 ㎡/g) than that of the boehmite particles (35.9 ㎡/g). The FT-IR analysis indicates that aliphatic, carbonyl, and hydroxyl groups are present on the surface of the CH4Al2O4 particles. When heat treated at 800 °C, the CH4Al2O4 phase is converted to γ-Al2O3 phase with a BET surface area of 164 ㎡/g.
URI
http://pubs.kist.re.kr/handle/201004/40257
ISSN
0167-577X
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KIST Publication > Article
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