Aluminum oxide, gamma

Materials. The sodium n—decylsulfate (CioS0 ) from Kodak and the sodium n-dodecylsulfate (CiaSO ) from Fisher were purified by recrystallization from water and from methanol, followed by drying under a vacuum. The alumina used was Aluminum Oxide C (Degussa Inc.), a primarily gamma alumina, with a surface area of lOO m /g. The NaCl was Fisher reagent grade and the water was distilled and deionized. 

Klosterkotter W. 1960. Effects of ultramicroscopic gamma-aluminum oxide on rats and mice. AMA Arch Ind Health 21 458-472. 

Hachiya, K., M. Ashida, M. Sasaki, H. Kan, T. Inoue, and T. Yasunaga. 1979. Study of the kinetics of adsorption-desorption of lead(2+) ion on a gamma-aluminum oxide surface by means of relaxation techniques. J. Phys. Chem. 83 1866-1871. Heller-Kallai, L., and C. Mosser. 1995. Migration of Cu ions in Cu montmorillonite heated with and without alkali halides. Clays Clay Miner. 43 738-743. 

C12SO4 on Gamma Aluminum Oxide (Data from ). 

Yu, G.T. and S.K. Yen, Determination of the diffusion coefficient of proton in CVD gamma aluminum oxide thin films. Surface and Coatings Technology, 166, 195 (2003). 

The typical activated aluminas used in water treatment are 28 X 48 mesh (0.6-0.3 mm diam) mixtures of amorphous and gamma aluminum oxide (y-AI2O3) prepared by low-temperature (300-600°C) dehydration of precipitated A1(0H)3. These highly porous materials have surface areas of 50-300 m /g. Using the model of hydroxylated alumina surface subject to protonation and deprotonation, the following ligand exchange reaction, Eq. (1), can be written for arsenate adsorption in acid solution (alumina exhaustion) in which =A1 represents the alumina surface and an overbar denotes the solid phase ... 

In all fractions, gamma-alumina was the only alumina phase detected. The fines contained significant amounts of a mixed-metal vanadate phase, denoted by the peaks labelled as "3." This mixed-metal phase may be composed of iron-vanadium-oxide or iron-vanadium-molybdenum-oxide, based on XRD patterns of available reference compounds. The extrudates, on the other hand, are dominated by peaks due to aluminum sulfate, "l," and vanadium pentoxide, "2," with little+ if ary, peaks due to the mixed-metal phase, 3, ... 

BENZENE HEXACHLORIDE, y (gamma) isomer or y-BENZENE HEXACHLORIDE (58-89-9) C H Cls Noncombustible however, the commercial product may be dissolved in a flammable solvent. The flash point will depend on the solvent used. If this material comes in contact with oxidizers, fire and explosions may result. Contact with alkalis, strong bases, amines, amides, and inorganic hydroxides may cause the formation of hydrogen chloride gas. Incompatible with alkali metals ozone, powdered metals such as aluminum, iron, potassium, sodium, zinc. Conosive to metals. Combustion caused the formation of toxic fumes of chlorine, hydrogen chloride, and phosgene. On small fires, use dry chemical power (such as Purple-K-Powder), water spray, foam or CO2 extinguishers. 

BENZENE HEXACHLORroE, 7 (gamma) ISOMER or 7-BENZENE HEXACHLORIDE (58-89-9) Noncombustible, however, the commercial product may be dissolved in a flammable solvent. The flash point will depend on the solvent used. If this material comes into contact with oxidizers, fire and explosions may result. Incompatible with aluminum, potassium, sodium. Corrosive to metals. 

BeryUiuin oxide-filled resins gain high conductivity without loss of electrical properties. Metal particles have heen used as fillers for plastics to improve or impart certain properties. Thus, aluminum has heen used for applications ranging from making a decorative finish to improving thermal conductivity. Copper particles are used in plastics to provide electrical conductivity. Lead is used because it dampens vibrations, acts as barrier to gamma-radiation, and has high density. 

Despite the above-mentioned advantages of cerium oxide and a-alumina especially for the conversion of alcohols, a wide variety of investigations have dealt with alkene conversion on y-alumina-supported active species [16, 28, 41]. For sol-gel layers, which can also be used as a support for CPO [8], the determination of the aluminum phase is often not reported (e.g. [42]) as calcination temperatures between 300 and 700 °C could result in a considerable contribution of amorphous phases to gamma phases and at 800-1000 °C there is an additional transition to a delta phase [43]. 

INAA is especially suited for the multielement analysis of matrices that, on neutron irradiation, do not produce inten.se gamma radiation or produce only short-lived ones. Examples of these matrices are graphite, silicon, and aluminum, or their oxides. A typical irradiation counting scheme allows the determination of 55 elements at submicro-gram-per-gram concentrations in wafers of silicon [37]. Also, other semiconductor or alloying materials such as Se, Ge, Sb, Te, and ultrapure metals such as Cu, Fe, Ti, Mo, Nb, Ni, Ga Zn, Sn, Zr, Bi, Pb, and noble metals have been analyzed. Often a postirradiation separation of the matrix activity is required, or a radiochemical separation scheme must be applied based on ion ex-... 

Metals and metallic powders, consisting of aluminum, bronze, copper, and nickel, are always used in PO, if products with very high thermal or electrical conductivity are required. Heavy metal powders additionally increase the resistance to neutron and gamma rays [66]. Metals in fiber form and metallic oxides are also supplied as fillers and reinforcements for PO. 

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