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首页> 外文期刊>RSC Advances >One-dimensional core-shell cellulose-akaganeite hybrid nanocrystals: synthesis, characterization, and magnetic field induced self-assembly
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One-dimensional core-shell cellulose-akaganeite hybrid nanocrystals: synthesis, characterization, and magnetic field induced self-assembly

机译：一维核-壳纤维素-赤铁矿杂化纳米晶体：合成，表征和磁场诱导的自组装

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摘要

Cellulose akaganeite hybrid nanocrystals (CAHNCs) were synthesized in situ from a ferrous chloride aqueous solution in the presence of pre-oxidized cellulose nanocrystals as a reducing agent for the reduction of dissolved ferrous ions under heat treatment and neutral gas flow. The characterization of the produced nanostructures by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, and vibrating sample magnetometry (VSM) confirmed that the fabricated one-dimensional nanoparticles were composed of rod-like cellulose nanocrystal cores coated by the shells of spherical chloride-containing akaganeite nanoparticles with an average diameter of about 4-6 nm, and they had superparamagnetic properties. To compare the magnetic response of the synthetized CAHNCs with the starting diamagnetic CNCs, the static magnetic fields of 1, 2, 4, and 8 T generated by a superconducting magnet were applied to the suspensions of either material during the dewatering process. In contrast to the CNCs, the CAHNCs were well-aligned under magnetic field intensity of 4 T and above. Moreover, the magnetic susceptibility of the CAHNCs was different from that of the CNCs by exhibiting magnetic field induced self-assembly parallel to the external magnetic field direction. Cellulose akaganeite hybrid microcrystals (CAHMCs) were added to the system as micro-scale models, which also confirmed the magnetic field induced self-assembly. Polarizing optical microscopy, FESEM, and wide-angle X-ray diffraction (WAXD) strongly confirmed the unidirectional magnetic field induced self-assembly of the CAHNCs parallel to the external magnetic field even under the magnetic intensity of 2 T. The reasons behind these observations are extensively discussed.
机译：在预氧化的纤维素纳米晶体作为还原剂的条件下，从氯化亚铁水溶液中原位合成了纤维素高铁矿物杂化纳米晶体（CAHNCs），用于在热处理和中性气流下还原溶解的亚铁离子。通过场发射扫描电子显微镜（FESEM），X射线衍射（XRD），衰减全反射-傅立叶变换红外（ATR-FTIR）光谱和振动样品磁强（VSM）表征所产生的纳米结构，证实了已制造出的纳米结构尺寸的纳米粒子由棒状纤维素纳米晶核组成，核芯被球形的含氯的赤霞石纳米粒子的壳包覆，平均直径约为4-6 nm，它们具有超顺磁性。为了比较合成的CAHNC与初始反磁性CNC的磁响应，在脱水过程中，将超导磁体产生的1、2、4和8 T的静磁场施加到任一材料的悬浮液上。与CNC相比，CAHNC在4 T及以上的磁场强度下排列良好。此外，CAHNC的磁化率与CNC的磁化率不同，表现出的磁场诱导的自组装平行于外部磁场方向。纤维素赤霞石杂化微晶（CAHMCs）作为微型模型添加到系统中，这也证实了磁场诱导的自组装。偏振光学显微镜，FESEM和广角X射线衍射（WAXD）强烈证实了单向磁场诱导的CAHNC的自组装，即使在2 T的磁场强度下也能与外部磁场平行。这些观察背后的原因被广泛讨论。

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