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Search Results (3)

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Keywords = urea glass route

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8 pages, 1076 KiB  
Article
Composite Nanostructures for the Production of White Light
by Giovanni Russo, Francesco Armetta, Tingke Rao, Wangchao Yuan, Vitalii Boiko, Dariusz Hreniak, Cristina Giordano and Maria Luisa Saladino
Molecules 2024, 29(19), 4605; https://doi.org/10.3390/molecules29194605 - 27 Sep 2024
Cited by 1 | Viewed by 770
Abstract
In this work, two different composite nanostructures, YAG:Ce and Ga0.9In0.1N, were prepared by the Urea Glass Route method and tested for the production of white light. The first composite was prepared by synthetizing the Ga0.9In0.1N [...] Read more.
In this work, two different composite nanostructures, YAG:Ce and Ga0.9In0.1N, were prepared by the Urea Glass Route method and tested for the production of white light. The first composite was prepared by synthetizing the Ga0.9In0.1N nanoparticles in the presence of YAG:Ce nanoparticles. The second one was prepared by synthetizing YAG:Ce nanoparticles in the presence of Ga0.9In0.1N nanoparticles. These systems can be useful for the production of white light. X-ray Diffraction and Transmission and Scanning Electron Microscopies (TEM and SEM) were used to evaluate their structural and morphological properties. Excitation and emission spectra, the quantum yield and colour of the emitted light were acquired to evaluate the optical properties of the systems. Full article
(This article belongs to the Section Materials Chemistry)
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13 pages, 8844 KiB  
Article
Preparation of HfCxN1−x Nanoparticles Derived from a Multifunction Precursor with Hf-O and Hf-N Bonds
by Guang Zeng, Ping Xu, Chen Zeng, Qizhong Huang and Zhean Su
Materials 2023, 16(12), 4426; https://doi.org/10.3390/ma16124426 - 16 Jun 2023
Cited by 1 | Viewed by 1783
Abstract
HfCxN1−x nanoparticles were synthesized using the urea-glass route, employing hafnium chloride, urea, and methanol as raw materials. The synthesis process, polymer-to-ceramic conversion, microstructure, and phase evolution of HfCxN1−x/C nanoparticles were thoroughly investigated across a wide range [...] Read more.
HfCxN1−x nanoparticles were synthesized using the urea-glass route, employing hafnium chloride, urea, and methanol as raw materials. The synthesis process, polymer-to-ceramic conversion, microstructure, and phase evolution of HfCxN1−x/C nanoparticles were thoroughly investigated across a wide range of molar ratios between the nitrogen source and the hafnium source. Upon annealing at 1600 °C, all precursors demonstrated remarkable translatability to HfCxN1−x ceramics. Under high nitrogen source ratios, the precursor exhibited complete transformation into HfCxN1−x nanoparticles at 1200 °C, with no observed presence of oxidation phases. In comparison to HfO2, the carbothermal reaction of HfN with C significantly reduced the preparation temperature required for HfC. By increasing the urea content in the precursor, the carbon content of the pyrolyzed products increased, leading to a substantial decrease in the electrical conductivity of HfCxN1−x/C nanoparticle powders. Notably, as the urea content in the precursor increased, a significant decrease in average electrical conductivity values was observed for the R4-1600, R8-1600, R12-1600, and R16-1600 nanoparticles measured at a pressure of 18 MPa, yielding values of 225.5, 59.1, 44.8, and 46.0 S·cm−1, respectively. Full article
(This article belongs to the Section Advanced and Functional Ceramics and Glasses)
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15 pages, 6784 KiB  
Article
Iron Carbide@Carbon Nanocomposites: A Tool Box of Functional Materials
by Chiara Defilippi, Mariam Omar Ali Mukadam, Sabina Alexandra Nicolae, Martin Richard Lees and Cristina Giordano
Materials 2019, 12(2), 323; https://doi.org/10.3390/ma12020323 - 21 Jan 2019
Cited by 13 | Viewed by 6280
Abstract
Iron carbide (Fe3C) is a ceramic magnetic material with high potential for applications in different fields, including catalysis, medicine imaging, coatings, and sensors. Despite its interesting properties, it is still somehow largely unexplored, probably due to challenging synthetic conditions. In this [...] Read more.
Iron carbide (Fe3C) is a ceramic magnetic material with high potential for applications in different fields, including catalysis, medicine imaging, coatings, and sensors. Despite its interesting properties, it is still somehow largely unexplored, probably due to challenging synthetic conditions. In this contribution, we present a sol-gel-based method that allows preparing different Fe3C@C nanocomposites with tailored properties for specific applications, in particular, we have focused on and discussed potential uses for adsorption of noxious gas and waste removal. Nanocomposites were prepared using readily available and “green” sources, such as urea, simple and complex sugars, and chitosan. The nanocomposite prepared from chitosan was found to be more efficient for CO2 uptake, while the sample synthetized from cellulose had optimal capability for dye absorption and waste oil removal from water. Full article
(This article belongs to the Special Issue Novel Metal Carbide/Carbonitride Materials)
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