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Anisotropy at nano-grain boundary and effective anisotropy between
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这是我今日搜集的资料，拿出来共享^^ 1. Anisotropy at nano-grain boundary and effective anisotropy between Abstract An expression of anisotropy at grain boundary suitable for different coupling conditions has been given, based on which the effective anisotropy between soft and hard grains /KshS has been calculated in nanoscaled magnetic materials. The results showed that /KshS increases rapidly first, then the increase becomes slow, and /KshS decreases with increasing Ds for the same value of Dh. /KshS decreases with increasing Ds for all given Dh, and the decrease rate becomes slow with increasing Dh. In order to obtain higher effective anisotropy between magnetically soft and hard grains, Dh should not be less than 25 nm, and Ds should be about 10 nm. Keywords: Nanoscaled magnetic material; Exchange-coupling interaction；Effective anisotropy 2. Effect of phase composition between nano c- and v-Al2O3 on Pt/Al2O3 catalyst in CO oxidation Abstract Alumina supports were prepared by solvothermal method of a mixed solution of toluene and butan-1-ol for various chi/gamma phase compositions and the Pt/Al2O3 catalyst was prepared by the incipient wetness impregnation technique. The catalysts were evaluated in the carbon monoxide oxidation. Increasing amount of %chi phase in the alumina supports has roughly the same BET surface area. The different alumina supports were affected on the Pt dispersion on alumina. The pure chi alumina and pure gamma alumina supports had the same effect of catalyst activity. In the various chi/gamma phase compositions, it was found that Pt dispersion and catalyst activity are lower than pure gamma and chi phases for alumina support with 10% chi. The alumina supports with 30–70% chi gave higher dispersion and activity than pure phase and 10% chi support. Keywords: c-Al2O3; v-Al2O3; Phase composition; Pt/Al2O3; CO oxidation [search]nano.纳米[/search] [ Last edited by popsheng on 2008-1-18 at 18:30 ] |
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