Green magnetite (Fe3O4): Unusual optical Mie scattering and magnetic isotropy of submicron-size hollow spheres
Green magnetite (Fe3O4): Unusual optical Mie scattering and magnetic isotropy of submicron-size hollow spheres
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DOI：
10.1063/1.3079407
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发表时间：
2009-02
影响因子：
4
通讯作者：
Q. Ye;Hirofumi Yoshikawa;S. Bandow;K. Awaga
中科院分区：
文献类型：
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作者：
Q. Ye;Hirofumi Yoshikawa;S. Bandow;K. Awaga
直径为650 nm和壳厚为40 nm的磁铁矿空心球显示出意想不到的绿色，与通常的磁铁矿固体呈现黑色相反。这种不寻常的绿色的解释是米氏散射的不均匀和低密度结构的空心球的特征直径，这是相当的可见光的波长。此外，中空球的薄膜不表现出二维形状各向异性，反映了单个颗粒的各向同性结构。这些结果表明，通过构建中空结构实现独特的物理性能的潜在优势。
Magnetite hollow spheres with a diameter of 650 nm and shell thickness of 40 nm exhibit an unexpected green color, in contrast with usual magnetite solids appearing black. This unusual green color is interpreted in terms of the Mie scattering on the inhomogeneous and low-density structure of the hollow spheres with a characteristic diameter that is comparable to the wavelength of the visible light. Further, thin films of the hollow spheres exhibit no two-dimensional shape anisotropy, reflecting the isotropic structure of individual particles. These results indicate the potential advantages in achieving unique physical properties through constructing hollow structures.