Topic
Thermogravimetric analysis
About: Thermogravimetric analysis is a research topic. Over the lifetime, 37248 publications have been published within this topic receiving 862144 citations. The topic is also known as: thermal gravimetric analysis & TGA.
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TL;DR: In this paper, the structure, morphology, optical and magnetic properties of the product was examined by X-ray diffraction, transmission electron microscopy, UV-visible spectrophotometer and superconducting quantum interference device magnetometer.
Abstract: Nickel oxide nanoparticles have been synthesized in the presence of agarose polysaccharide by sol–gel method. The structure, morphology, optical and magnetic properties of the product was examined by X-ray diffraction, transmission electron microscopy, UV–visible spectrophotometer and superconducting quantum interference device magnetometer. The result of thermogravimetric analysis of the precursor product showed that the proper calcination temperature was 400 °C. X-ray diffraction result revealed that the obtained product was nickel oxide with face-centered cubic structure. TEM image demonstrated that the nickel oxide nanoparticles have spherical shape with size around 3 nm. Analysis of FTIR spectra confirmed the composition of product. The optical absorption band gap of the NiO nanoparticles was estimated to be 3.51 eV. Magnetic measurement showed that the nickel oxide nanoparticles exhibit superparamagnetic behavior at 300 K. Moreover, the nanoparticles show ferromagnetic interactions at 4.2 K owing to the existence of uncompensated moments on the surface of the nanoparticles.
151 citations
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TL;DR: Results of X-ray diffraction analyses indicated that the intensity of diffraction peak at 19 degrees of PVA became lower and broader with increasing the amount of GA in the CS/PVA/GA ternary blend film.
151 citations
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TL;DR: In this article, a granular hydrogel based on chitosan (CTS) and acrylic acid (AA) was prepared using Fenton's reagent as the redox initiator and N,N′-methylenebisacrylamide as the crosslinker under ambient conditions.
Abstract: A granular hydrogel based on chitosan (CTS) and acrylic acid (AA) was prepared using Fenton’s reagent as the redox initiator and N,N′-methylenebisacrylamide as the crosslinker under ambient conditions. The resulting three-dimensional (3D) networks can serve as micro- or nano-reactors for the production of highly stable silver nanoparticles by the in situ reduction of silver nitrate (AgNO3) with sodium borohydride (NaBH4) as reducing agent and Al3+ as surface crosslinking agent. The as-prepared Ag-entrapped hydrogel was successfully confirmed by means of Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA), and then tested to catalyze the NaBH4 reduction of two organic dyes: methylene blue (MB) and Congo red (CR). The catalytic results indicate that within 30 min, MB and CR with an initial concentration of 20 mg L−1 can be reduced completely, and the catalytic activity is independent of initial pH and ion strength. In addition, the Ag-entrapped hydrogel shows excellent reusability for ten successive cycles, with no appreciable decrease in the catalytic effects.
151 citations
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TL;DR: A metal organic framework modified with amino group (NH2-UiO-66) was functionalized with glycidyl methacrylate (GMA) via ring opening reaction between the amine species in the framework and epoxy groups in GMA as discussed by the authors.
151 citations
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TL;DR: In this article, a three-step purification process of multi-walled carbon nanotubes (MWNTs) produced by catalytic CVD method with Ni-Mg-O as catalysts is described.
151 citations