Materials Literature
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The temperature dependence of the magnetostrain was investigated in the Ni50Mn27.5Ga22.5 magnetic shape memory alloy with a five-layer martensitic (5M) structure in the temperature range from 110Kto300K. A temperature threshold at 166K was found for the magnetostrain. A giant magnetostrain of 6.3% was achieved above t…
Ammonia (NH3) gas was thought to be essential for the growth of vertically aligned multiwalled carbon nanotubes (VA-MWCNTs) and led to the formation of bamboo-like structures. Here, we show that VA-MWCNTs with ideal tubular structures can be grown on substrates by various mixed gases with or without NH3 gas. The growt…
We report that vacuum-deposited amorphous MoO3–TeO2 films of different thickness (469–1185 nm) and compositions show metal-insulator transition (MIT) in the temperature (Tp) range 341–231 K (depending on thickness and composition). Interestingly, the corresponding thick bulk glass plates (∼0.2–0.5-mm thickness) of sam…
Microstructure and mechanical properties of Al2O3-TiO2-SiC nanocomposites were studied. To improve the mechanical and tribological properties of alumina, nano-sized TiO2 and SiC powders were dispersed. Spark Plasma Sintering (SPS) technique, at 1400°C, 50 MPa for 5 minutes, was applied for the densification of Al2O3-T…
The typical thermoluminescent phosphor of CaSO4:Tm was investigated using a heating rate method including very slow rates of heating, down to 0.0008°Cs−1. The sufficiently slow rates of heating clearly resolved at least eight narrow components in the main glow. The analysis of the peak temperature values and the half-…
Atomic number contrast (Z-contrast) imaging using high-angle annular dark field (HAADF) detector, along with high resolution electron microscopy (HREM), is used to study the nanostructured metal, semiconductor, mixed oxide, and soft matter composites of inhomogeneous nature. A comparison between the HREM and HAADF ima…
Nanosized ZnxMn1-xFe2O4 powders were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates. The average size and distribution of the synthesized ZnxMn1-xFe2O4 powders were 10- 20 ㎚ and narrow, respectively. The magnetic property of the synthesized ZnxM…
We report the ionic relaxation and mixed mobile ion effect in 50ZrF4−10BaF2−10YF3−(30−x)LiF−xNaF fluoride glass series, where fluorine anions participate in the diffusion process in addition to alkali cations, unlike mixed alkali oxide glasses and crystals. By analyzing the ion dynamics in the framework of a power-law…
Snapshot hyperspectral imaging simultaneously acquires spatial and spectral information about a scene. We report on the first, to our knowledge, all-reflective snapshot hyperspectral imager in the form of a computed tomography imaging spectrometer (CTIS). The reflective design allows for instrument simplicity for appl…
A novel europium complex, Eu(Hdinic)(dinic)(H2O)5·4H2O (dinic = 2,5-pyridinedicarboxylic acid), has been synthesized under hydrothermal conditions and characterized structurally by X-ray diffraction methods. The complex has a mononuclear molecular structure, is monoclinic, space group C2/c, with a = 13.877(5), b = 9.6…
Generation of new carbon nanotube sample types, including individualized nanotubes suspended in surfactant solutions and recently synthesized ultralong nanotubes, has enabled new experimental studies that provide useful insight into nanotube structure and photophysical behavior. We present a review of Raman studies pe…
Magnetite (Fe3O4) has attracted much interest due to its unique properties such as the Verwey transition and 100% spin polarization at the Fermi surface. In this study thin films of epitaxial magnetite were grown on MgO and MgAl2O4 substrates using pulsed laser deposition. Previous studies suggested that the Verwey tr…
A series of oxalato-bridged dinuclear copper(II) complexes of the general formula [Cu2(Pz2CPh2)2(X)2(mu-C2O4)] (X = Cl- (1), NO3(-) (2), ClO4(-) (3); Pz2CPh2 = diphenyldipyrazolylmethane) or [Cu2(Pz(3m)2CPh2)2(H2O)2(mu-C2O4)](NO3)2 x H2O (4) (Pz(3m)2CPh2 = diphenylbis(3-methylpyrazolyl)methane) was synthesized where t…
Zinc oxide nanowires (ZnO NWs) were successfully synthesized on the ITO/PET polymer substrates by a hydrothermal method. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy investigations were carried out to characterize the crystallinity, surface morphologies, and orientations of the…
A series of ceria nanoparticles were synthesized by using a microemulsion method. The effect of relative concentration of surfactant/water on the size and the surface roughness of ceria nanoparticles was examined using transmission electron microscopy (TEM) and atomic force microscopy (AFM) respectively. The investiga…
Atomistic mechanisms that determine atomic coordination and local concentration of dopants at $\ensuremath{\Sigma}5$ $(310)∕[001]$ symmetric tilt grain boundaries in ${\mathrm{Y}}_{2}{\mathrm{O}}_{3}$-doped ${\mathrm{ZrO}}_{2}$ are analyzed using atomistic simulation techniques. Segregation mechanisms are found to be…
Surface-enhanced Raman scattering (SERS) spectra of the biologically important 2-aminobenzothiazole (2-ABT) molecule adsorbed on silver hydrosols are compared with its FTIR spectrum and normal Raman spectroscopy (NRS) spectrum in the bulk and in solution. The optimized structural parameters and the computed vibrationa…
Expressions for the random-distribution and cluster-formation models for light-induced changes in crystals studied by time-resolved diffraction are presented. The two models can be distinguished on the basis of differences in the predicted intensities. The light-induced increase in the atomic displacement parameters i…
We have investigated the excited-state properties and singlet oxygen ((1)Delta(g)) generation mechanism in phthalocyanines (4M; M = H(2), Mg, or Zn) and in low-symmetry metal-free, magnesium, and zinc tetraazaporphyrins (TAPs), that is, monobenzo-substituted (1M), adjacently dibenzo-substituted (2AdM), oppositely dibe…
Abstract Superparamagnetic and biodegradable/biocompatible core–corona nanocomposite particles were prepared by ring‐opening polymerization of ϵ‐caprolactone initiated from the surface of maghemite. As was done in a previous work, an aminosilane coupling agent was chosen as the coinitiator and immobilized at the surfa…