Preparation and characterization of narrow-dispersed magnetic colloidal nanoparticle cluster/silica microspheres with controlled sizes, high saturation magnetization and MRI enhancement effect
| Autor: | Lei Qin, Youshen Wu, Xiaowei Kang, Tao Fu, Yan Li, Guangquan Wei, Daocheng Wu, Feilong Yang, Cheng Luo |
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| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Materials science Biocompatibility Scanning electron microscope Biomedical Engineering Analytical chemistry Nanoparticle General Chemistry General Medicine law.invention Colloid Transmission electron microscopy law General Materials Science Calcination Fourier transform infrared spectroscopy |
| Zdroj: | Journal of materials chemistry. B. 1(36) |
| ISSN: | 2050-7518 |
| Popis: | A comprehensive method combining polymerization-induced colloid aggregation, silica coating, and high-temperature calcination is developed for the preparation of micro-sized magnetic colloidal nanoparticle cluster/silica (CNC/silica) microspheres. The silica shell stabilizes the inner micro-sized γ-Fe2O3 nanoparticle clusters without phase transformation during high-temperature calcination instead of acting as anti-sintering agents. Their morphologies and inner structures are observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The material characteristics are investigated by Fourier transfer infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and vibrating-sample magnetometer (VSM). The biocompatibility and MRI enhancement effect of CNC/silica microspheres are also evaluated by MTT assay and MRI imaging. The prepared CNC/silica microspheres are narrow-dispersed with a wide size range of 1.8 μm to 5.0 μm. These microspheres also have the advantages of higher saturation magnetization (61.38 emu g−1), easily modifiable surfaces, good biocompatibility, high cell-label efficiencies, and significantly enhanced T2 effect in MRI, indicating their various potential applications in biomedical fields. |
| Databáze: | OpenAIRE |
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