Abstract
Well-defined hexagon γ-alumina (γ-Al 2O 3) nanosheets were successfully obtained with a sol–gel process under supercritical ethanol drying condition. The sol–gel of alumina precursors was carried out in refluxing aqueous solutions that contained excess urea and 0.1–0.4 M Al 3+, always kept the [urea]/[Al 3+] ratio constant at a value of 3.0. The obtained precursor precipitates were calcined at different temperatures in a muffle furnace in order to compare with supercritical ethanol drying. The effects of reactant original concentrations in the sol–gel solution, sol–gel precursor concentrations in the supercritical ethanol solution and time for removal supercritical ethanol vapour have been studied. Nano-γ-alumina particles obtained by supercritical ethanol drying exhibited hexagon sheet characteristics with the diameter of 5–10 nm and always had the γ-alumina phase. The formation mechanism of nanosheets γ-alumina was also discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
