Abstract In the literature, several attempts have been made to synthesize and later to modify magnetic nanoparticles to make them feasible for several applications. For biomedical applications, magnetic nanoparticles and clay minerals were combined to form a material that is both stable and biocompatible. In this context, composites with ratios of 4.70, 2.35 and 1.17 (weight/weight) of Cobalt Ferrite and Laponite were synthesized and characterized. These composites were treated with acid, and consequently the laponite was converted into an amorphous silica matrix around the magnetic nanoparticles. This morphology was confirmed using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD). The particle size distribution, obtained by Transmission Electron Microscopy (TEM), was used as an input parameter for the polydispersity function in the Small Angle X-ray Scattering (SAXS) analysis. The latter was also applied to verify the particle shapes and aggregates for each composite. It was demonstrated by Thermal Gravimetric Analysis (TGA), that these materials, except for the composite with the highest ratio, adsorbed at least one order of magnitude more water than pure Cobalt Ferrite nanoparticles. Thus, increasing the hydrophilicity properties of the Cobalt Ferrite - laponite/silica system. A preliminary magnetization experiment corroborated with these findings and showed that a fraction of the system is not in the superparamagnetic regime at room temperature.

中文翻译：

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使用合成锂皂石分散体来增加钴铁氧体磁性纳米粒子的亲水性

摘要 在文献中，已经进行了多次尝试来合成磁性纳米颗粒，然后对其进行改性，使其适用于多种应用。对于生物医学应用，磁性纳米粒子和粘土矿物结合形成一种既稳定又具有生物相容性的材料。在这种情况下，合成并表征了铁氧体钴和锂皂石的比例为 4.70、2.35 和 1.17（重量/重量）的复合材料。这些复合材料用酸处理，因此合成锂被转化为磁性纳米颗粒周围的无定形二氧化硅基质。使用傅立叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 确认了这种形态。通过透射电子显微镜 (TEM) 获得的粒度分布，在小角度 X 射线散射 (SAXS) 分析中用作多分散函数的输入参数。后者还用于验证每种复合材料的颗粒形状和聚集体。热重分析 (TGA) 表明，除了具有最高比率的复合材料外，这些材料比纯钴铁氧体纳米颗粒吸附的水至少多一个数量级。因此，增加了钴铁氧体-锂皂石/二氧化硅系统的亲水性。初步磁化实验证实了这些发现，并表明系统的一部分在室温下不处于超顺磁性状态。热重分析 (TGA) 表明，除了具有最高比率的复合材料外，这些材料比纯钴铁氧体纳米颗粒吸附的水至少多一个数量级。因此，增加了钴铁氧体-锂皂石/二氧化硅系统的亲水性。初步磁化实验证实了这些发现，并表明系统的一部分在室温下不处于超顺磁性状态。热重分析 (TGA) 表明，除了具有最高比率的复合材料外，这些材料比纯钴铁氧体纳米颗粒吸附的水至少多一个数量级。因此，增加了钴铁氧体-锂皂石/二氧化硅系统的亲水性。初步磁化实验证实了这些发现，并表明系统的一部分在室温下不处于超顺磁性状态。