Continuous synthesis of high-surface-area aluminum hydroxide methoxide nano- and microparticles in supercritical methanol and their conversion into γ-Al2O3
- Continuous synthesis of high-surface-area aluminum hydroxide methoxide nano- and microparticles in supercritical methanol and their conversion into γ-Al2O3
- Bambang Veriansyah; 수산티; 아궁; 민병권; 김재훈
- supercritical fluids; nanofluids; nanoparticles; Nano- and microparticles; Nanocrystalline materials; Supercritical methanol; Aluminum hydroxide methoxide; γ-Al2O3
- Issue Date
- Materials letters
- VOL 65, NO 4, 772-774
- 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.
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