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lingyun79木虫 (著名写手)
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1. Chem. Commun., 2007, 1816–1818 Title：Nanonecklaces assembled from gold rods, spheres, and bipyramids Shuzhuo Zhang,ab Xiaoshan Kou, Zhi Yang, Qihui Shi, Galen D. Stucky, Lingdong Sun, Jianfang Wang* and Chunhua Yan* Abstract：Gold nanorods, nanospheres, and bipyramids have been assembled using glutathione and cysteine into three types of necklace structures, which might be useful for the fabrication of nanoscale photonic, electronic, and optoelectronic devices. 2. J. Phys. Chem. C, early view Title：Synthesis and Assembly of Magnetite Nanocubes into Flux-Closure Rings Ying Xiong,†,‡ Jing Ye,†,‡ Xiaoyu Gu,‡ and Qian-wang Chen*,†,‡ DiVision of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, UniVersity of Science and Technology of China, Hefei 230026, People’s Republic of China, and Department of Materials Science and Engineering, UniVersity of Science and Technology of China, Hefei 230026, People’s Republic of China Abstract：Single-crystalline magnetite nanoparticles with a relatively narrow size distribution around 48 nm were solvothermally synthesized in a water-alcohol mixed solvent solution at 230 °C using ferrocene ((C5H5)2Fe), polyvinylpyrrolidone (PVP), and hydrogen peroxide (H2O2) as starting materials. These magnetite nanoparticles exhibited almost standard cube-like shape and were coated with a thick PVP layer (8 nm) to form a magnetite-PVP core-shell structure. Driven by strong magnetic dipolar attractions, magnetite nanocubes could be assembled into flux-closure rings, which consisted of several to dozens of nanocubes. The rings had one-particle annular thickness, and individual nanocubes were spaced fully together. It was found that only nanocubes, the average size of which was close to 50 nm, could be assembled into rings, while slightly smaller particles were aligned in dipolar chains, suggesting that ring self-assembly could be produced by the degradation of dipolar chains that were a metastable structure with respect to rings, and only larger nanocubes with strong magnetic dipoles could overcome the potential barrier for the transformation from chains to rings. |
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