Materials Literature
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Highly porous hydroxyapatite (Ca10(PO4)6(OH)2, HA) was prepared through hydrothermal (HT) transformation of aragonitic cuttlefish bones (Seppia Officinalis L. Adriatic Sea) in the temperature range from 140°C to 220°C for 20 minutes to 48 hours. Mechanism of hydrothermal transformation of bones was investigated by DTA…
Effective symmetric and antisymmetric eigenmodes of coupled plasmonic resonances play a crucial role in many photonic metamaterials. Recently, we discussed a particular arrangement of metallic split-ring resonators that is planar, hence enabling direct experimental access to the different eigenmodes via near-field opt…
Thermal barrier coatings (TBCs) are an enabling materials technology to improve the efficiency and durability of gas turbines and thus through such efficiency improvements offer reduce fuel usage and an associated reduction in CO2 emission. This commercial drive is pushing both aero- and industrial turbines to be life…
Spatial localization to a defect or a dopant of one of the charge carriers comprising an exciton, has a significant effect on the optical properties of bulk semiconductors. It is not clear, however, how these effects would change when considering semiconductor nanocrystals in the strong confinement regime. As we show…
This article talks about graphene and its properties.
The field of “Metal-Organic Frameworks” (MOFs) has grown exponentially, giving rise to nanoporous materials with promising applications in gas storage, molecular separation or catalysis. Despite the use of solvothermal synthesis, some MOFs can be obtained only as polycrystalline samples and in those cases, powder diff…
We present two silver nanocones separated by 450 nm, well beyond the typical gap spacing of coupled nanoantennas, and connected by a metal bridge to facilitate plasmonic coupling between them. The tip-enhanced Raman scattering from crystal violet molecules is found to be almost an order of magnitude higher from the br…
Mechanical properties of Cr2O3 nanoparticle blended cementitious composite cured in saturated limewater have been optimized. Cr2O3 nanoparticles with partial replacement of cement by 0.5, 1.0, 1.5, and 2.0 wt% have been used as reinforcement. To determine the strength of cement pastes, the specimens were cured in two…
Thermal annealing of nanocrystal Fe3S4 films are studied using x-ray diffraction (XRD), scanning-electron microscopy, micro-Raman scattering and vibrating sample magnetometry. The evolution of XRD patterns due to thermal annealing provides evidence for the conversion of Fe3S4 to Fe7S8 and Fe3O4 at low temperatures and…
One of the most important problems in both the fabrication and exploitation of ceramicmetal composites are residual thermal stresses. The paper presents the results of a numerical analysis (by the Finite Elements Method) of the stress state induced in the NiAl matrix composites reinforced with spherical particles of a…
The use of metamaterial for design of radar absorbing material (RAM) is discussed. The typical features of the frequency dependencies of , , , of composites manufactured of different types of resonant inclusions are given as an example. The RAM characteristics obtained by the use of the composites are given.…
Abstract Porous platinum nanotubes (PtNTs) with a all thickness of 5 nm, an outer diameter of 60 nm, and a length of 5–20 μm are synthesized by galvanic displacement with silver nanowires, which are formed by the ethylene glycol reduction of silver nitrate. Oxygen reduction reaction (ORR) and durability experiments ar…
A method for thermodynamic characterization of shape-stabilized PCM based on onesingle sample and one-single experiment has been proposed. The simplicity of the experimental device is comparable to that of the T-History method. However, instead of simple energy balances as in T-History method, a numerical heat transfe…
TaN–Cu and TaN-Ag nanocomposite films were deposited by reactive co-sputtering on Si. The films were then annealed using RTA (Rapid Thermal Annealing) at 400 °C for 2, 4, 8, 15 minutes respectively to induce the nucleation and growth of metal particles in TaN matrix and on film surface. The samples were then tested fo…
Crystal structures of Li2MO3 (M=Sn, Ti) and TiO(OH)2 have been studied in detail and refined using X-ray powder diffraction data. All compounds posses a high concentration of defects in the structure. The crystal structures of the Li2MO3 salts obtained at 700°C reveal stacking faults of LiM2 metal layers, which leads…
The thermal and transport properties of PYR1(2O1)TFSI-PYR13FSI ionic liquid binary mixtures as electrolytes for low temperature electrochemical devices are reported in the present paper. The DSC measurements are in good agreement with the conductivity results. It is shown that the incorporation of even small mole frac…
In this study, the self-propagating high-temperature synthesis (SHS) and following acid leaching techniques were carried out to produce zirconium diboride (ZrB2) powder. In the SHS experiments, technical grade ZrO2 powder, and different amounts of B2O3 and Mg powders were used. The SHS products were obtained in the fo…
Fluoride emissions during continuous casting operations could cause health problems and equipment corrosion. For these reasons, nowadays free fluor mould fluxes are developed, using other oxides in order to substitute fluoride compounds. Although physical properties of the flux must be garantizied to prevent operation…
The fabrication of artificial heterostructures is mainly based on substitution systems. We present simple ways to construct double-sided versions of the Fibonacci, Prouhet–Thue–Morse, paperfolding, period doubling and Golay–Rudin–Shapiro sequences. We also construct a generic instance of the two-dimensional Prouhet–Th…
Abstract A new series of CNPPV derivatives that contain oligothiophenes in the polymer backbone, have been synthesized by Knoevenagel polycondensation. Different lengths of oligothiophene units have been introduced to study the relationship between polymer structure and electronic properties. Thermal stability, UV‐vis…