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Yb-Doped Titanate-Germanate Glasses for Near-IR Luminescence Applications: Synthesis, Characterization, and the Influence of TiO Concentration.
Materials (Basel)
November 2024
Institute of Chemistry, University of Silesia, Szkolna 9 Street, 40-007 Katowice, Poland.
In the framework of luminescent rare-earth-doped glasses for near-infrared applications, TiO-containing inorganic glasses have been recently demonstrated to be a promising alternative to commercially used high-phonon SiO-based glasses. This study investigates the effect of TiO concentration on the near-infrared spectroscopic properties of Yb ions in multicomponent titanate-germanate glasses. A series of glass samples in the xTiO-(60-x)GeO-BaO-GaO-YbO system (x ranging from 0 to 50 mol%) were synthesized using the melt-quenching technique.
View Article and Find Full Text PDFEnhanced Thermal Conductivity of Thermoplastic Polyimide Nanocomposites: Effect of Using Hexagonal Nanoparticles.
Polymers (Basel)
November 2024
Branch of Petersburg Nuclear Physics Institute Named by B.P. Konstantinov of National Research Centre «Kurchatov Institute»-Institute of Macromolecular Compounds, Bolshoi, pr. 31 (V.O.), 199004 St. Petersburg, Russia.
Article Synopsis
- Thermoplastic polyimides are popular in electronics due to their performance but struggle with low thermal conductivity.
- This study explored nanocomposites made from semicrystalline (R-BAPB, BPDA-P3) and amorphous (ULTEM) polyimides combined with hexagonal nanoparticles like graphene, graphene oxide, and boron nitride to enhance thermal properties.
- Results showed that incorporating these nanoparticles improved thermal conductivity, especially with increased concentrations, by forming aggregate structures that facilitated phonon transport, despite affecting the mobility of polymer chains.
Organic Phosphonium Side-Chain Engineering in Metal Halide Glassy Scintillators for Enhanced X-Ray Dynamic Imaging.
Small
December 2024
College of Chemistry, Fuzhou University, Fuzhou, 350116, P. R. China.
X-ray imaging utilizing organic-inorganic hybrid metal halide (OIHMH) glassy scintillators has garnered significant attention. But their inferior radioluminescence makes achieving rapid image acquisition difficult, posing a persistent challenge for dynamic imaging. Herein, organic phosphonium halide side-chain engineering is proposed, introducing bulky aromatic rings at the alkyl chain ends, to improve the radioluminescence of OIHMHs.
View Article and Find Full Text PDFStructure-Property Correlation in Ba/Sr-Ca-Mg-Zn-Si-Al-O Glass: Elucidation by Experimental and Molecular Dynamics Simulation Study.
J Phys Chem B
December 2024
Specialty Glass Division, CSIR-Central Glass and Ceramic Research Institute, 196 Raja S.C. Mullick Road, Kolkata, West Bengal 700032, India.
Broad band transmitting glasses from visible to mid-infrared with good mechanical strength, chemical durability, glass-forming ability, and thermal stability are preferred for optics and laser technology applications. Generally, low phonon energy glasses possess an extended transmission cutoff toward mid-infrared, but at the same time, retention of other desired properties is challenging for the researchers. In this work, we have shown that mixed alkaline earth (Ba/Sr) would have the potential to improve overall glass properties while retaining its low phonon energy when CaO is partially substituted by BaO/SrO in calcium magnesium zinc silica-aluminate (CMZSA) glass.
View Article and Find Full Text PDFAnharmonicity and lattice thermal conductivity of negative thermal expansion materials Zn(CN) and Cd(CN) by first-principles calculations.
Dalton Trans
January 2025
School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China.
Certain negative thermal expansion (NTE) materials have been reported to exhibit anomalous lattice thermal conductivity (LTC), making them particularly interesting for theoretical studies. In Zn(CN) and Cd(CN), cyanide bonds have induced great NTE behavior and anharmonicity, making us believe they would exhibit anomalous LTC. To investigate this, we employed first-principles calculations based on density functional theory and solved the linearized Boltzmann transport equation within the relaxation time approximation to calculate the LTC.
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