Solid-phase low temperature steam-assisted synthesis of thermal stable alumina nanowires.
A simple steam-assisted solid phase synthesis method was developed for synthesis of boehmite nanowires in the presence of TEAOH surfactant. The boehmite nanowires had uniform diameters (12-16 nm) and length up to 1-2 microm. The morphology of the nanostructured wires was well preserved after being converted to pure gamma-Al2O3 by thermal treatment at 600 degrees C for 5 h. The nanowires of Al2O3 exhibited excellent thermal stability by retarding the phase transformation and maintaining the wires-like nanostructure after being aged up to 1300 degrees C by preventing sintering between particles at high temperatures. The surface areas of Al2O3 nanowires could be maintained as high as 68 m2/g at 1300 degrees C while the surface areas of Al2O3 micropowder shrank to 0.89 m2/g after same thermal treatment. Both in-situ XRD and 27Al NMR results indicated that the crystal structure of gamma-Al2O3 nanowires was not transformed to alpha-Al2O3 at 1300 degrees C whereas micropowder Al2O3 was fully converted to alpha-Al2O3 at 1100 degrees C.
Shen
S C
SC
Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833, Republic of Singapore.
Ng
W K
WK
Chen
Q
Q
Zeng
X T
XT
Chew
M Z
MZ
Tan
Reginald B H
RB
D000536:Aluminum Hydroxide / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry*; D003460:Crystallization; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D053770:Nanowires / Q000737:chemistry*; D011208:Powders; D013059:Spectrum Analysis, Raman; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction
D011208:Powders; D000536:Aluminum Hydroxide; C069471:aluminum oxide hydroxide; D000537:Aluminum Oxide