In recent times, nanoparticles have been the focal point of research in nanoscience due to their wide scope of potential applications in all fields of science. Iron oxide (Fe 3 O 4 ) nanoparticles (NPs) show incredible magnetic saturation, stability, biocompatibility, and intuitive properties on the surface, which makes them ideal for being utilized in several ways. In the present study, Fe 3 O 4 NPs were synthesized by co-precipitation and further coated with silica (SiO 2 ) to avoid aggregation. Synthesized nanoparticles (Fe 3 O 4 @SiO 2 ) were individually functionalized using glycine and malonic acid and characterized by various spectroscopies and microscopies techniques. XRD diffraction analysis showed that the presence of SiO 2 did not alter the diffraction pattern peaks, which represented the existence of Fe 3 O 4 . The presence of Fe 3 O 4 and SiO 2 nanoparticles were further confirmed using EDS. Transmission electron microscope micrographs of the synthesized nanoparticles exhibited spherical shape and confirmed the increase in particle size after coating with SiO 2. Also, the analysis of dynamic light scattering showed that the particle size of Fe 3 O 4 @SiO 2 functionalized with malonic acid (229.433 nm) was greater than those functionalized with glycine (57.2496 nm). However, the surface area was greater in Fe 3 O 4 @SiO 2 -glycine (104.8 m 2 /g) than Fe 3 O 4 @SiO 2 -malonic acid (26.15 m 2 /g). The key findings suggest that the synthesized core-shell Fe 3 O 4 @SiO 2 nanoparticles are a promising candidate for a wide array of applications in the field of medicine and environmental science.

中文翻译：

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Fe3O4@SiO2核@壳纳米结构的合成、表面改性和表征

近年来，纳米粒子因其在所有科学领域的广泛潜在应用而成为纳米科学研究的焦点。氧化铁 (Fe 3 O 4 ) 纳米粒子 (NP) 在表面显示出令人难以置信的磁饱和度、稳定性、生物相容性和直观特性，这使得它们非常适合以多种方式加以利用。在本研究中，Fe 3 O 4 NPs 通过共沉淀合成，并进一步用二氧化硅 (SiO 2 ) 包覆以避免聚集。合成的纳米粒子（Fe 3 O 4 @SiO 2 ）使用甘氨酸和丙二酸单独官能化，并通过各种光谱和显微镜技术表征。XRD衍射分析表明SiO 2 的存在没有改变衍射图谱峰，这代表Fe 3 O 4 的存在。使用 EDS 进一步证实了 Fe 3 O 4 和 SiO 2 纳米颗粒的存在。合成的纳米粒子的透射电子显微镜显微照片呈现球形，并证实用 SiO 2 包覆后粒径增加。此外，动态光散射分析表明，Fe 3 O 4 @SiO 2 的粒径被丙二酸官能化（ 229.433 nm) 大于那些用甘氨酸官能化的 (57.2496 nm)。然而，Fe 3 O 4 @SiO 2 -甘氨酸的表面积（104.8 m 2 /g）大于Fe 3 O 4 @SiO 2 -丙二酸（26.15 m 2 /g）的表面积。主要发现表明，合成的核壳 Fe 3 O 4 @SiO 2 纳米颗粒是医学和环境科学领域广泛应用的有希望的候选者。合成的纳米粒子的透射电子显微镜显微照片呈现球形，并证实用 SiO 2 包覆后粒径增加。此外，动态光散射分析表明，Fe 3 O 4 @SiO 2 的粒径被丙二酸官能化（ 229.433 nm) 大于那些用甘氨酸官能化的 (57.2496 nm)。然而，Fe 3 O 4 @SiO 2 -甘氨酸的表面积（104.8 m 2 /g）大于Fe 3 O 4 @SiO 2 -丙二酸（26.15 m 2 /g）的表面积。主要发现表明，合成的核壳 Fe 3 O 4 @SiO 2 纳米颗粒是医学和环境科学领域广泛应用的有希望的候选者。合成的纳米粒子的透射电子显微镜显微照片呈现球形，并证实用 SiO 2 包覆后粒径增加。此外，动态光散射分析表明，Fe 3 O 4 @SiO 2 的粒径被丙二酸官能化（ 229.433 nm) 大于那些用甘氨酸官能化的 (57.2496 nm)。然而，Fe 3 O 4 @SiO 2 -甘氨酸的表面积（104.8 m 2 /g）大于Fe 3 O 4 @SiO 2 -丙二酸（26.15 m 2 /g）的表面积。主要发现表明，合成的核壳 Fe 3 O 4 @SiO 2 纳米颗粒是医学和环境科学领域广泛应用的有希望的候选者。