一种具有超顺磁性磁铁矿纳米粒子在管腔中选择性加载的磁性埃洛石纳米复合材料的方法。,Inorganic Chemistry

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一种具有超顺磁性磁铁矿纳米粒子在管腔中选择性加载的磁性埃洛石纳米复合材料的方法。
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2020-08-12 , DOI: 10.1021/acs.inorgchem.0c01039
Hady Hamza ₁ , Anna Maria Ferretti ₂ , Claudia Innocenti _{3,

4,

5} , Katarzyna Fidecka ₁ , Emanuela Licandro ₁ , Claudio Sangregorio _{3,

4,

5} , Daniela Maggioni _{1,

4}

Affiliation

我们首次提出了一种通过将直径约为6 nm的流体动力学直径约为10 nm的超顺磁性磁铁矿纳米颗粒（SPION）装入HNT来制备磁性埃洛石纳米管（HNT）的方法。我们发现，达到此目标的最有效途径取决于通过十四烷基膦酸（TDP）对HNT内腔进行修饰，得到HNT–TDP，然后加载预先形成的油酸（OA）稳定的SPION。透射电子显微镜证明仅在管腔中存在高度结晶的磁性纳米颗粒，其部分呈链状结构。相反，尝试通过使用覆盖有带负电的封端剂的SPION来利用HNT内腔的正电荷或原位获得相同的结果通过热分解合成SPION无效。HNT–TDP的特征在于红外光谱（ATR-FTIR），热重分析（TGA）和ζ电位，所有技术均证实了HDP上存在TDP。此外，通过使用尼罗红确定了TDP的内部定位，该分子的发光对环境的极性非常敏感。通过测量ZFC-FC磁化曲线以及300和2.5 K下的磁滞循环，对游离的SPION @ OA（作为胶体悬浮液和粉末）和SPION-in-HNT粉末进行了磁学表征，证实了嵌入SPION-in-HNT后，游离SPION的顺磁行为和主要磁性能得以保留。

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An Approach for Magnetic Halloysite Nanocomposite with Selective Loading of Superparamagnetic Magnetite Nanoparticles in the Lumen.

We present for the first time a method for the preparation of magnetic halloysite nanotubes (HNT) by loading of preformed superparamagnetic magnetite nanoparticles (SPION) of diameter size ∼6 nm with a hydrodynamic diameter of ∼10 nm into HNT. We found that the most effective route to reach this goal relies on the modification of the inner lumen of HNT by tetradecylphosphonic acid (TDP) to give HNT–TDP, followed by the loading with preformed oleic acid (OA)-stabilized SPION. Transmission electron microscopy evidenced the presence of highly crystalline magnetic nanoparticles only in the lumen, partially ordered in chainlike structures. Conversely, attempts to obtain the same result by exploiting either the positive charge of the HNT inner lumen employing SPIONs covered with negatively charged capping agents or the in situ synthesis of SPION by thermal decomposition were not effective. HNT–TDP were characterized by infrared spectroscopy (ATR-FTIR), thermogravimetric analysis (TGA), and ζ-potential, and all of the techniques confirmed the presence of TDP onto the HNT. Moreover, the inner localization of TDP was ascertained by the use of Nile Red, a molecule whose luminescence is very sensitive to the polarity of the environment. The free SPION@OA (as a colloidal suspension and as a powder) and SPION-in-HNT powder were magnetically characterized by measuring the ZFC-FC magnetization curves as well as the hysteresis cycles at 300 and 2.5 K, confirming that the super-paramagnetic behavior and the main magnetic properties of the free SPION were preserved once embedded in SPION-in-HNT.

更新日期：2020-08-12

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