Materials Literature
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Sm3+ and Nd3+ co-doped ceria thin-film electrolytes have been deposited on polycrystalline alumina substrates via RF magnetron sputtering. Electric conductivity is evaluated with respect to the residual stress in the film by sin2 ψ-methodology, indicating that an in-plane tensile stress is applied to the as-deposited…
Using density functional calculations, we study the structural, energetic, and electronic properties of a triplet form of (5,0) carbon nanotube. In contrast to the weak tube–tube interactions found in a bundle of large diameter nanotubes, the ultrasmall (5,0) tubes within the triplet are covalently connected and appea…
Highly fluorescent and water-soluble cadmium selenide quantum dots (QDs) functionalised by thio-cyclodextrin (HS-CD) and mercaptoacetic acid (MAA) as surface coating agents (QDs-CD-MAA) were synthesised successfully. The synthesised hybrid nanomaterials, QDs-CD-MAA, were able to form water-soluble complexes with pacli…
High-quality polycrystalline SmFeAsO0.75 was synthesized with a superconducting transition width less than 1 K, and the electronic behavior was systematically studied by transport and specific heat measurements. An obvious superconducting jump was witnessed, together with a very small normalized superconducting jump,…
Magnetic interactions in solid-state tantalum cluster compounds have been evidenced by using magnetic susceptibility measurements and corroborated by broken-symmetry DFT calculations. The three selected compounds are based on [Ta(6)X(12)(H(2)O)(6)](3+) (X=Cl or/and Br) units with edge-bridged Ta(6) octahedral clusters…
We present a simple experimental technique based on diffraction for determining the complex refractive index of metamaterials, and demonstrate it with metamaterials that consist of detuned electrical dipoles (DEDs), mimicking the dressed-state picture of electromagnetically induced transparency (EIT). The metamaterial…
Single crystals of ZnO were implanted with 100 keV-Co ions at room temperature with a fluence of 4.8×1016cm−2 and subsequently annealed at different temperatures up to 800∘C. The samples were analyzed by Rutherford backscattering spectrometry, secondary ion mass spectrometry, X-ray diffraction, X-ray photoemission spe…
Solvent mass uptake and the swelling of ultrathin polyelectrolyte films (within thickness range 157–375 Å) in the presence of water vapor have been performed to study the effect of long-range Coulombic interaction between charged segments of a polyelectrolyte chain on its swelling dynamics. Films were prepared from aq…
X-ray absorption spectroscopy performed on a CuFeO${}_{2}$ single crystal reveals the pivotal role of the Cu ions in the discussion of the anisotropic properties of the compound. In particular, it is shown that there is a $3d$ hole density on the nominal $3{d}^{10}$ Cu${}^{+}$ ions which may lie at the origin of the i…
A type of Si3N4-based nanocomposites ceramic cutting tool material was prepared by the addition of nano-scale Si3N4W whisker and nano-scale TiN particle. Cutting performance of the Si3N4/Si3N4W/TiN nanocomposite ceramic tool in machining of cast iron was investigated in comparison with a commercial sialon ceramic tool…
Novel volume measurements on an epoxy resin subjected to carbon dioxide pressure jumps (PCO 2 ) are used to investigate the structural recovery of glassy polymers after plasticizer jumps. Previously, we had investigated an epoxy resin after plasticizer concentration jumps using relative humidity (RH) and CO 2 and evid…
By means of first-principles calculations, we have investigated a size dependence of elastic modulus in single-walled ZnO nanotubes with armchair and zigzag forms. It is found that for these tubes the Young’s modulus is increased dramatically with the increased diameters and inversely proportional to the Zn−O bond len…
A trigonal Cr3+ (3d3) defect in sillenite type Bi12SiO20 crystals co-doped with chromium and phosphorus has been identified by means of multi-frequency X-band (9.4 GHz), Q-band (35 GHz) and W-band (94 GHz) electron paramagnetic resonance (EPR). A consistent analysis of the observed spectra and their angular dependence…
Single-crystalline sample of Nd2Co7 (TC 613 K) has been used to study “anisotropic” magnetocaloric effect (MCE), originated from field induced rotation of the magnetic moment from easy- to hard-magnetization direction. Anisotropy constants were estimated using measured magnetization isotherms within 200–320 K temperat…
The polyurethane prepolymer was synthesized, and hydrophilic nano-sized silica (A200) was added to the prepolymer with KH550 as a coupling agent, then a waterborne polyurethane/nanosilica hybrid material (WPUNS) was obtained by a sol-gel process. The structure and performance of the WPUNS films were studied by FTIR, T…
The dynamics of cephalosporins controlled release from a new hybrid inorganic/organic nanomaterial was investigated. Magnetic Fe3O4 nanoparticles were synthesized using the sol-gel method, while a hybrid nanostructured Fe3O4/oleic acid – core/shell – material was prepared under microwave conditions and further charact…
A selective preparation and the formation mechanism of hexagonal and cubic CoO nanoparticles from the reaction of [Co(acac)(2)] (acac=acetylacetonate) and amine have been investigated. CoO nanoparticles with a hexagonal pyramidal shape were yielded under decomposition conditions with amine. Importantly, the addition o…
Polarized Raman spectroscopy has been employed to investigate the evolution of the microstructure of 0.67PbMg1/3Nb2/3O3-0.33PbTiO3 (PMN-33%PT) single crystal in the temperature range from −195 to 300 °C. The MA-MC-cubic transition sequence was observed in the microareas with MA-type (space group Cm) and MC-type (space…
This study examined the local structural properties of CuI at low temperatures of 10-300 K by x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS) measurements at the Cu K edge. The XRD data were refined using two models, split (distorted zinc-blende structure) and non-split (zinc-blende struct…
We performed optical spectroscopy measurement on a single crystal of CeTe${}_{3}$, a rare-earth-element tri-telluride charge-density-wave (CDW) compound. The optical spectra are found to display very strong temperature dependence. In addition to a large and pronounced CDW energy gap that is already present at room tem…