Narrow Results

Iron (Fe)-based nanoparticles are extremely valuable in biomedical applications owing to their low toxicity and high magnetization values at room temperature. In this study, we synthesized nearly monodisperse iron oxide (Fe₃O₄) and Fe@Fe₃O₄ (core: Fe, shell: Fe₃O${}_4)$ nanoparticles in aqueous medium under argon flow and then, coated them with various biocompatible ligands and silica. In this study, eight types of surface-modified nanoparticles were investigated, namely, Fe₃O₄@PAA (PAA = polyacrylic acid; $M_w$ of PAA = 5100 amu and 15,000 amu), Fe₃O₄@PAA–FA (FA = folic acid; $M_w$ of PAA = 5100 amu and 15,000 amu), Fe₃O₄@PEI–fluorescein (PEI = polyethylenimine; $M_w$ of PEI = 1300 amu), Fe@Fe₃O₄@PEI ($M_w$ of PEI = 10,000 amu), Fe₃O₄@SiO₂ and Fe@Fe₃O₄@SiO₂ nanoparticles. We characterized the prepared surface-modified nanoparticles using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) absorption spectroscopy, a superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy and confocal microscopy. Finally, we measured the cytotoxicity of the samples. The results indicate that the surface-modified nanoparticles are biocompatible and are potential candidates for various biomedical applications.

Graphene/Fe₃O₄/Ni nano-composite materials were prepared by one-step hydrothermal method from RGO, FeCl₃ ⋅ 6H₂O and purity Ni. The structure and electromagnetic microwave absorbing properties were investigated systematically by field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and vector network analyzer (VNA). The reflectance was simulated based on the electromagnetic parameters to evaluate the absorption properties of the sample. The results show that Fe₃O₄ and Ni are on the surface of graphene evenly, the composites exhibit excellent microwave absorption properties, reflection loss and broad effective absorption bandwidth are −16.38 dB and 3.60 GHz, as the paraffin wax is 40% and the matching thickness is 2.00–3.50 mm.

This paper analyzes the employment of nanotechnology and FHD effect on the transportation of fluid within a container. Carrier fluid is a combination of H₂O and iron oxide and homogeneous model was incorporated to guess the features. The complex equations can be achieved by incorporating the source terms of Kelvin force and gravity term and in order to solve them, the control volume-based FEM approach was applied. To examine the accuracy, previous article of on FHD flow was examined and the achieved data showed nice accuracy. Laminar flow was analyzed and the influences of Kelvin and gravity forces were examined along with the role of the nano-sized particles. As Mn${}_F$ augments, impingement of fluid with wall enhances and bigger Nu was obtained. The effect of Ra on the characteristics of ferrofluid is same as Mn${}_F$. Disperse of nanosized material makes Nu to rise to about 12.8% owing to greater conductivity of ferrofluid. Given $\mathrm{\text{Ra}}=1$E4, the augment of Kelvin force causes Nu to intensify to about 27.09%.