Materials Literature
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Raman spectra of camphor soot has been investigated and optimised with a Raman microscope system operated at laser excitation wavelength of 514.5 nm. Several band combinations for spectral analysis have been tested, and a combination of three Lorentian bands ( G,D1,D2) at about 1580, 1350 and 1620 cm-1, respectively,…
By exploiting the highly chromatic behavior of semiconductor structures with mesoscopic dimensions only slightly smaller than the wavelength, efficient diffraction is maintained over almost one octave.
Conventional optical components rely on the propagation effect to control the phase and polarization of light beams. One can instead exploit abrupt phase and polarization changes associated with scattered light from optical resonators to control light propagation. In this talk, we discuss the optical responses of anis…
The influence of the concentration of adenine (AD) on the corrosion of 304 austenic stainless steel in chloride acid solutions was studied. The investigations involved electrochemical polarization methods, scanning electron microscopy (SEM) and quantum chemical calculations method. Tafel polarization study revealed th…
Co(II), Ni(II) and Cu(II) complexes with novel heterocyclic ligands derived from 4-acetylpyridine with thiosemicarbazide were synthesized and characterized by elemental analysis, molar conductivity, spectral methods (mid infrared, 1H-NMR, mass and UV/vis. spectra) and simultaneous thermal analysis (TG/DTG) techniques.…
This study was designed to investigate the relationship between the microclimate temperature and clothing insulation (Icl) under comfortable environmental conditions. In total, 20 subjects (13 women, 7 men) took part in this study. Four environmental temperatures were chosen: 14°C (to represent March/April), 25°C (May…
The published data on the chemical and physical modifications of cellulose aimed at creation of a wide variety of new innovative materials for hi-tech and priority directions in the development of science and engineering are summarized. Investigations into the chemical modification of cellulose via nucleophilic substi…
Lichen-like porous manganese oxides (MnOx) with birnessite-type structure, which were assembled with curled nanosheets (less than 10 nm in thickness), were deposited in situ on the surface of activated carbon (AC) via facile reduction of permanganate by AC, and were tested for the decomposition of ozone, a common air…
Abstract Ce 3+ ‐, Tb 3+ ‐, and Mn 2+ ‐activated Ca 9 MgNa(PO 4 ) 7 (CMNP) phosphors have been prepared by a Pechini‐type sol–gel method. X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), and photoluminescence (PL) and cathodoluminescence (CL) spectro…
An experimental setup for the direct measurement of the magnetocaloric effect capable of simulating high frequency magnetothermal cycles on laboratory-scale samples is described. The study of the magnetocaloric properties of working materials under operative conditions is fundamental for the development of innovative…
From blue to red: The structure and luminescence properties of the gadolinium(III) complex 1 were investigated. Reversible switching of the luminescence of 1 in THF at room temperature by alternating light irradiation and O2 exposure is presented, during which the emission color changes as shown in the picture. Light-…
Porous silicon (pSi) is a nanostructured carrier system that has received considerable attention over the past 10 years, for use in a wide variety of biomedical applications, including biosensing, biomedical imaging, tissue scaffolds and drug delivery. This interest is due to several key features of pSi, including exc…
Manganese-doped SnO2 nanocrystals and nanowires with diameters below SnO2 Bohr radius were synthesized by solution methods. X-ray absorption studies reveal that dopant ions are substitutionally incorporated as Mn2+ and Mn3+. Mn2+ is the dominant species at low doping levels, but the fraction of Mn3+ increases with dop…
The stoichiometric layered perovskite cobaltite PrBaCo2O6 has been synthesized using an oxidative reaction of PrBaCo2O5.80 by sodium hypochlorite. The ferromagnetic properties of this oxide, which exhibits the highest TC of 210 K among the “112” layered cobaltites, are interpreted by double exchange mechanism. In cont…
Nanostructured Mn3-xGa ribbons with x = 0, 0.4, 0.9 and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal D019and cubic L21Heusler crystal structures based on the concentration of Mn in Mn3-xGa. Upon vacuum-annealing the samples at 450 °C for about 50 hours,…
Abstract A comparison between various methods for determining the capacitance and resistance of electrochemical double layer capacitors (EDLC) with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), galvanostatic charge‐discharge methods and cell voltage jump experiments are presented. Therefore, a…
The growing field of spintronics relies on new techniques and technologies for injecting and detecting electron spins to generate spin-dependent signals and utilize spin as a new state variable. Magnetic tunnel junctions (MTJs) do this by employing thin oxide layers as insulating barriers between two ferromagnetic met…
The results of measurements of the threshold of explosive decomposition of PETN with 0.1 wt % additives of aluminum nanoparticles under the action of the first and second harmonics of a YAG:Nd 3+ laser with a pulse duration of 12 ns are presented. A comparison of experimental and theoretical results is performed. It i…
Due to the ever increasing demand for higher storage capacity in disk drives, novel techniques to read and write information, such as heat-assisted magnetic recording are being developed. However, the recording temperatures impact not only the media but also the carbon overcoat that is used to protect both the media a…
Porous alumina films, prepared by anodization of pure aluminum (Al) thin film deposited on SiO2/Si substrate, has been fabricated and characterized. Constant voltage and constant current anodization in two-electrode cell configurations were performed. Electro-oxidation of Al in the voltage range of 1-90V was explored…