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1.
Monodisperse Au-Fe 3 O 4 heterodimeric nanoparticles (NPs) were prepared by injecting precursors into a hot reaction solution.The size of Au and Fe 3 O 4 particles can be controlled by changing the injection temperature.UV-Vis spectra show that the surface plasma resonance band of Au-Fe 3 O 4 heterodimeric NPs was evidently red-shifted compared with the resonance band of Au NPs of similar size.The as-prepared heterodimeric Au-Fe 3 O 4 NPs exhibited superparamagnetic properties at room temperature.The Ag-Fe 3 O 4 heterodimeric NPs were also prepared by this synthetic method simply using AgNO 3 as precursor instead of HAuCl 4.It is indicated that the reported method can be readily extended to the synthesis of other noble metal conjugated heterodimeric NPs. 相似文献
2.
N. Balchev K. Nenkov V. Antonov J. Pirov B. Kunev 《Physica C: Superconductivity and its Applications》2010,470(22):2040-2046
Samples with nominal compositions MoSnxSr2YCu2O8−δ (0 ? x ? 0.075) were synthesized and their superconducting and magnetotransport properties were investigated. It was established that the optimum Sn-doping (x = 0.02 and 0.03) increases the Tc of the undoped MoSr2YCu2O8−δ. The upper critical fields of the samples were determined using magnetization, susceptibility and resistivity measurements. It was established that the Sn-doping weakly affects the first and the intragrain second critical field of Mo-1212 but enhances the extrapolated to T = 0 (i.e. the intergrain) upper critical field. The observed phenomena were discussed on the basis of the Josephson-junction-arrays model. A phenomenological expression describing the temperature dependency of the susceptibility of Mo-1212 was found. 相似文献
3.
B.H. Olaniyi G.A. Beer A. Fry J.A. Macdonald G.R. Mason A. Olin R.M. Pearce P.R. Poffenberger 《Nuclear Physics A》1982,384(3):345-352
We have measured the energies and linewidths of the pionic Kα X-rays for 20Ne and 22Ne using a natural liquid-neon target. The results are
20Ne | 22Ne | |
Neenergy (keV) | 239.12±0.14 | 230.49±0.88 |
width (keV) | 15.43±0.41 | 12.65±3.51 |