Catalog Number
ACM1344281-14
Product Name
Alumina (Alpha) Nanopowder
Description
Aluminum oxide is a white odorless crystalline powder. Water insoluble. Properties (both physical and chemical) vary according to the method of preparation; different methods give different crystalline modifications. The variety formed at very high temperature is quite inert chemically.;DryPowder; DryPowder, OtherSolid; DryPowder, PelletsLargeCrystals; DryPowder, WetSolid; Liquid; OtherSolid; PelletsLargeCrystals; PelletsLargeCrystals, OtherSolid; WetSolid; WetSolid, Liquid;WHITE POWDER.;White, odorless, crystalline powder.;White, odorless, crystalline powder.
IUPAC Name
dialuminum;oxygen(2-)
Molecular Weight
101.961g/mol
Molecular Formula
Al2O3;Al2O3;Al2O3
Canonical SMILES
[O-2].[O-2].[O-2].[Al+3].[Al+3]
InChI
InChI=1S/2Al.3O/q2*+3;3*-2
InChI Key
PNEYBMLMFCGWSK-UHFFFAOYSA-N
Boiling Point
5396 °F at 760 mm Hg (NIOSH, 2016);2977 °C;3000 °C;5396°F;5396°F
Melting Point
3632 °F (NIOSH, 2016);2030 °C;2054 °C;3632°F;3632°F
Density
4 (NIOSH, 2016);Density: 3.4-4.0;3.97 g/cm³;4;4.0
Solubility
Insoluble (NIOSH, 2016);Difficult solubility in mineral acids and strong alkali;Insoluble in water;Solubility in water: none;Insoluble
Application
Alumina (Alpha) Nanopowder serves as a versatile material with extensive applications in various industries due to its unique physical and chemical properties. This nanopowder consists of α-aluminum oxide, which forms colorless hexagonal crystals and is known for its hardness and thermal stability. The material is abundant in nature, primarily in the form of bauxite and laterites, and is synonymous with the term 'corundum' when found naturally. In industry, alumina is highly valued for its role as an abrasive and catalyst. The nanopowder can act as an adsorbent owing to its high surface area and pore structure, which makes it effective for drying gases and liquids, as well as in adsorption chromatography. Catalytically, it is involved in processes such as sulfur recovery and the dehydration of alcohols, attributed to its surface active sites. In addition to its catalytic and adsorption properties, alumina (Alpha) Nanopowder is integral in producing abrasives for dental applications, materials for ceramic composites, and in the formulation of pharmaceuticals, highlighting its multifunctional utility in both industrial and medical fields.
Color/Form
White crystalline powder;White powder, balls or lumps or various mesh
Covalently-Bonded Unit Count
5
Exact Mass
101.947821g/mol
MeSH Entry Terms
Alumina;Alumina Ceramic;Aluminum Oxide;Aluminum Oxide (Al130O40);Aluminum Oxide (Al2O);Aluminum Oxide (AlO2);Bauxite;Ceramic, Alumina;Corundum;Oxide, Aluminum;Sapphire
Monoisotopic Mass
101.947821g/mol
Other Experimental
Very hygroscopic; an electrical insulator, electrical resistivity at 300 °C about 1.2x10+13 ohms-cm; very hard, about 8.8 on Mohs' scale; when heated above 800 °C, becomes insoluble in acid; specific gravity increases from 2.8 to 4.0 when heated above 800 °C;White powder, hexagonal; MP: 2054 °C; BP: 2977 °C; density: 3.99 g/cu cm; insoluble in water, organic solvents; slightly soluble in alkaline solutions /Alpha-alumina/;Soft white powder; transforms to corundum at 1200 °C; density: 3.97 g/cu cm; insoluble in water; soluble in acid; slightly soluble in alkaline solutions /Gamma-alumina/;Heat of formation: -130.0 kJ/mol; Gibbs energy of formation: -159.0 kJ/mol; molar entropy: 259.4 J/mol-K; molar heat capacity at constant pressure: 45.7 J/mol-K at 298.15 K;Vapor pressures: 100 Pa at 2122 °C; 1 kPa at 2351 °C; 10 kPa at 2629 °C; 100 kPa at 2975 °C;Enthalpy of fusion: 111.1 kJ/mol /Alpha-alumina/;Index of refraction: 1.7598 /alpha-alumina/; 1.7598 /gamma-alumina/;Density: 3.97 g/cu cm; Mohs' hardness: 9; index of refraction: 1.761 (alpha), 1.769 (beta) /Corundum/;Ridgeway's hardness scale: 12; Knoop hardness: 21 kN/sq m;Mean specific heat: 795.5 J/kg-K from 25-1,800 °C; thermal conductivity: 10.9 W/m-K at 500 °C, 6.2 W/m-K at 1000 °C; linear thermal expansion coefficient: 8.6/deg C X 10+6, from 20-1000 °C
Refractive Index
Index of refraction: 1.768, 1.760
Vapor Pressure
0 mm Hg (approx) (NIOSH, 2016);1 mm Hg at 2158 °C;0 mmHg (approx);0 mmHg (approx)
