In recent years, the perspective of applying hafnium oxide (HfO 2 ) has geared up in various field of medical science such as neutron detection, bioimplants, biosensors, radiotherapy etc., The present study is to synthesis HfO 2 nanoparticles, and check its cell viability for in vivo applications. Hafnium oxide nanoparticles of different sizes (8.79, 7.16, 6.78 nm) were synthesized by varying the intervals of stirring time (6 h, 8 h, 12 h) by precipitation method. XRD pattern and Raman spectroscopy revealed that this material crystallizes in a monoclinic structure. SEM images and TEM micrographs showed that the HfO 2 NPs were spherical in shape with an average particle size of below 10 nm. The EDAX spectrum showed that the synthesized nanoparticles were HfO 2 . 3T3 fibroblast cell lines were chosen for cytotoxic study as it mimics the human cells. The aim of this study is to compare the toxicity of different sizes of HfO 2 nanoparticles on interaction with 3T3 fibroblast cell lines. From this study we could infer that smaller sized nanoparticles (6.78 and 7.17 nm) have 86% cell viability even at the concentration of 2500 g/mL.
This paper reports on the preparation of graphene oxide (GO) modified with hafnium oxide (HO) nanoparticles composites by a simple mixing and their use as efficient electrode in electrochemical supercapacitors. The technique relies on simple mixing the aqueous solutions of hafnium oxide (HO) nanoparticles and graphene oxide (GO) at different ratios of GO content (20, 30 and 40 wt%). The morphological studies, chemical composition and electrochemical behavior of the resulting HO/GO nanocomposites were investigated by using UV/vis spectrometry, X-Ray Diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and electrochemical respectively. The electrochemical performance, including the capacitive behavior of the HO/GO nanocomposites were investigated by cyclic voltammetry and galvanostatic charge-discharge curves. The HO/GO nanocomposites (40 wt%) ratio exhibited the best performance with a specific capacitance of 268 Fg -1 at a scan rate 5 mVs -1 in 1 M H2SO4 and it shows excellent long-term cycle stability.
The HfO2 nanoparticles and the nanocomposites of HfO2-graphene (10, 30, and 50 wt%) were prepared via precipitation and simple mixing method. The XRD pattern confirmed the presence of monoclinic HfO2 and hexagonal graphene in the nanocomposite. Raman spectroscopy studies revealed the formation of HfO2-graphene nanocomposite. According to SEM and TEM images the HfO2, NPs are spherical, and their size is less than 10 nm, anchored on the surface of the graphene sheets. The EDX spectrum shows carbon, oxygen, and HfO2 and reveals the formation of the HfO2-graphene nanocomposite. The UV-vis absorption spectra show the optical properties of synthesized HfO2-graphene nanocomposite. The study examines the influence of different ratios of the addition of graphene on the photocatalytic activity of HfO2-graphene. It was found that the HfO2-graphene (50 wt%) 40 mg nanocomposite exhibits enhanced photocatalytic activity than the bare HfO2 towards the methylene blue photodegradation, an aromatic pollutant in water under UV light irradiation, which can be applied optimally for individually wastewater management system. The HfO2-graphene (50 wt%) photocatalyst degrades 81 ± 2% of tetracycline in 180 min, implying that tetracycline can be degraded more efficiently under UV light. The enhancement in photocatalytic activity under UV light illumination can be attributed to the effective separation of photogenerated electrons, inhibiting recombination in the HfO2-graphene composite.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.