Hydrothermal synthesis of novel alpha alumina nano-materials with controlled morphologies and high thermal stabilities

Following a strong demand for novel α-Al 2 O 3 nano-materials with unique properties, both pure and doped nano-sheets, nano-needles, and nanosized equiaxed particles (reference) of 100% phase-pure α-Al 2 O 3 , were synthesized at 430-450 °C under 10.3 MPa pressure by the hydrothermal treatment of bo...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:CrystEngComm 2010-01, Vol.12 (1), p.2996-32
Hauptverfasser: Suchanek, Wojciech L, Garcés, Juan M
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Following a strong demand for novel α-Al 2 O 3 nano-materials with unique properties, both pure and doped nano-sheets, nano-needles, and nanosized equiaxed particles (reference) of 100% phase-pure α-Al 2 O 3 , were synthesized at 430-450 °C under 10.3 MPa pressure by the hydrothermal treatment of boehmite powder (γ-AlOOH) in the presence of α-Al 2 O 3 seeds and 1-10% morphology modifiers. SiO 2 and H 3 BO 3 were used as morphology modifiers to produce phase pure α-Al 2 O 3 nano-sheets and nano-needles, respectively, that exhibited strong crystallographic c - and a -faceting and BET surface areas up to 40 m 2 g −1 stable above 1000 °C. A mesocrystal growth mechanism of the α-Al 2 O 3 nano-particles was observed. Unprecedented flexibility to control the sizes and morphologies of α-Al 2 O 3 enabled fabrication of 90% porous ceramics with unique pore geometries and pore volumes up to 1.5 cm 3 g −1 . These novel α-Al 2 O 3 nano-materials can be useful in a variety of catalytic applications, nano-filtration, chemical-mechanical planarization, composites, etc. Hydrothermally synthesized α-Al 2 O 3 nano-sheets and nano-needles, prepared in the presence of SiO 2 and H 3 BO 3 morphology modifiers, respectively, exhibit strong crystallographic c - or a -faceting with high BET surface areas up to 40 m 2 g −1 that are temperature stable above 1000 °C.
ISSN:1466-8033
1466-8033
DOI:10.1039/b927192a