Synthesis of Double-wall Nanoscroll Intercalated with Polyfluorinated Cationic Surfactant into Layered Niobate and their Magnetic Alignment
Synthesis of Double-wall Nanoscroll Intercalated with Polyfluorinated Cationic Surfactant into Layered Niobate and their Magnetic Alignment
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插层多氟阳离子表面活性剂双壁纳米卷层状铌酸盐的合成及其磁取向
DOI：
10.1039/c6cp01547f
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Haruo Inoue
中科院分区：
文献类型：
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作者：
Yu Nabetani;Akino Uchikoshi;Souki Miyajima;Syed Zahid Hassan;Vivek Ramakrishnan;Hiroshi Tachibana;Masafumi Yamato;Haruo Inoue
具有各向异性性质的纳米材料如纳米卷的取向对于实现其在装置中的有效和复杂功能是非常重要的，包括人工光合细胞中的纳米结构电极。在这项研究中，我们成功地合成了一个nanoscroll通过插入的阳离子多氟表面活性剂到层间空间的层状层状碳酸盐，并成功地控制其取向，通过施加外部磁场在水中。通过与七氟丁酰氨基乙基十六烷基二甲基溴化铵（C3 F-S）在水中混合，剥离的纳米片被有效地卷起以形成纳米卷，其具有精细的层状结构（d 020 = 3.64 nm），而相应的烃类似物（C3 H-S）不形成纳米卷。从纳米片纯化和分离的纳米卷的合成产率估计为62重量%。原子力显微镜（AFM）证实，大多数的纳米片（98%）被转化为纳米卷。将外部磁场施加到纳米卷以迫使它们对齐。磁处理后，通过小角X射线散射（SAXS）和透射电子显微镜（TEM）的纳米卷的取向进行了研究。SAXS图案的非均匀环形分布表明，分散在水中的纳米卷在施加磁场时排列良好。纳米卷的长轴在所施加的场的方向上取向，并且长纳米卷更有效地对齐。当插入的C3 F-S分子通过用酸处理从纳米卷中除去时，所得的纳米卷没有表现出磁性排列，强烈表明C3 F-S在磁场对纳米卷的取向控制中起重要作用。
The orientation of nanomaterials with an anisotropic nature such as nanoscrolls is very important for realizing their efficient and sophisticated functions in devices, including nanostructured electrodes in artificial photosynthetic cells. In this study, we successfully synthesized a nanoscroll by intercalation of a cationic polyfluorinated surfactant into the interlayer spaces of layered niobate and successfully controlled its orientation by applying an external magnetic field in water. The exfoliated niobate nanosheets were efficiently rolled-up to form nanoscrolls, which have a fine layered structure (d020 = 3.64 nm), by mixing with heptafluorobutanoylaminoethylhexadecyldimethylammonium bromide (C3F-S) in water, whereas the corresponding hydrocarbon analogue (C3H-S) did not form nanoscrolls. The synthetic yield for the purified and isolated nanoscrolls from the nanosheets was estimated to be 62% by weight. It was confirmed by atomic force microscopy (AFM) that most of the niobate nanosheets (98%) were converted to nanoscrolls. An external magnetic field was applied to the nanoscrolls to force them to align. After the magnetic treatment, the orientation of the nanoscrolls was investigated by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The non-uniform ring distribution of the SAXS patterns indicates that the nanoscrolls dispersed in water were aligned well on applying the magnetic field. The long axis of the nanoscroll was oriented in the direction of the applied field and long nanoscrolls were aligned more efficiently. When the intercalated C3F-S molecules were removed from the nanoscrolls by treating with an acid, the resultant nanoscrolls did not exhibit magnetic alignment, strongly suggesting that C3F-S plays an important role in the orientation control of the nanoscrolls by the magnetic field.