四方晶系
纳米棒
各向异性
材料科学
化学物理
凝聚态物理
纳米技术
磁场
胶体
相(物质)
结晶学
光学
物理
晶体结构
化学
量子力学
物理化学
作者
Zhiwei Li,Qian Chang,Wenjing Xu,Chenhui Zhu,Yadong Yin
出处
期刊:Science Advances
[American Association for the Advancement of Science]
日期:2021-09-10
卷期号:7 (37)
被引量:28
标识
DOI:10.1126/sciadv.abh1289
摘要
Morphological and magnetic anisotropy can be combined in colloidal assembly to create unconventional secondary structures. We show here that magnetite nanorods interact along a critical angle, depending on their aspect ratios and assemble into body-centered tetragonal colloidal crystals. Under a magnetic field, size-dependent attractive and repulsive domains develop on the ends and center of the nanorods, respectively. Our joint experiment-computational multiscale study demonstrates the presence of a critical angle in the attractive domain, which defines the equilibrium bonding states of interacting rods and leads to the formation of non–close-packed yet hard-contact tetragonal crystals. Small-angle x-ray scattering measurement attributes the perfect tetragonal phase to the slow assembly kinetics. The crystals exhibit brilliant structural colors, which can be actively tuned by changing the magnetic field direction. These highly ordered frameworks and well-defined three-dimensional nanochannels may offer new opportunities for manipulating nanoscale chemical transformation, mass transportation, and wave propagation.
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