Materials Literature
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The parameters of excited states of oxygen-deficient centers (ODCs) in high-energy-electron irradiated crystalline and glassy SiO 2 have been studied using optical absorption, luminescence, and photoelectron emission spectroscopy. Additional evidence has been gained in support of the model of a neutral oxygen vacancy…
We have investigated hole-carrier-doping effects in a ferromagnetic insulator ${\text{La}}_{2}{\text{MnNiO}}_{6}$. Employing the ab initio band-structure method, we have examined the changes in the electronic structures and the valence states of Sr-doped ${\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{MnNiO}}_{6}…
The long-range 3D magnetic ordering in the Fe 3+ -containing langasite family compound Ba 3 TaFe 3 Si 2 O 14 was observed below 27 K with the iron lattice split into two nonequivalent magnetic sublattices. The appearance of the nonequivalent Fe sites is associated with the structural phase transition P 321→ P 3 induce…
We use density functional theory (DFT) to examine the adsorption of H2O on the SrO- and TiO2-terminated SrTiO3(100) surface. At coverages of 0.5 monolayer (ML), we find that water preferentially binds associatively on the TiO2 termination by 0.2 eV/H2O and negligible differences in energy between associated and dissoc…
The addition of low loss ilmenite impurities, can effectively tailor the dielectric properties of MgTiO3 without modifying the crystal structure. In the present study, the modification of the structural and dielectric properties of sol gel derived MgTiO3 films by doping with Ni and Zn is exploited. The change of the d…
Electron backscatter diffraction techniques have been used to assess the range of textures that exist in a number of common titanium alloys. Crystal orientation maps and pole figures have been obtained over representative areas to study preferred textures and regions of common crystallography (macrozones). Electron ba…
5-Fluorouracil-loaded N-succinyl-chitosan nanoparticles (5-FU-Suc-Chi/NP) were prepared by emulsification solvent diffusion. Biodistribution and tumor targeting were evaluated after i.v. administration of 5-Fu-Suc-Chi/NPs in Sarcoma 180-bearing mice. Also, pharmacokinetic profiles were evaluated after intravenous inje…
The optical transmission spectrum of [111](c) poled relaxor-based ferroelectric single crystal 0.93Pb(Zn(13)Nb(23))O(3)-0.07PbTiO(3) (PZN-0.07PT) was measured in the range of ultraviolet to near infrared. The optical absorption edge has been determined and the wavelength dependence of the absorption coefficient was ca…
We present spatial-coordinate transformation techniques to control the propagation of electromagnetic fields in several surprising and useful applications. The implementation of this approach is based on the fact that Maxwell's equations are form-invariant under coordinate transformations. Specifically, the effect of…
Because of the sensitivity of some photovoltaic devices to moisture-induced corrosion, they are packaged using impermeable front- and back-sheets along with an edge seal to prevent moisture ingress. Evaluation of edge seal materials can be difficult because of the low permeation rates involved and/or non-Fickian behav…
Lanthanide containing octahedral hexanuclear complexes with general chemical formula [Ln 6 O(OH) 8 (NO 3 ) 6 (H 2 O) x ].2NO 3 . y H 2 O where Ln = Ce–Lu (except Pm) or Y, x = 0, 6, 12, 14 or 16 and y = 0, 2, 4 or 5 constitute a great family of polymorphic compounds. The synthesis and the crystal structures of all the…
Two new steroidal glycosides characterized with 2,6-dideoxypyranoses as component sugars have been isolated from roots of Cynanchum wallichii Wight. Their structure elucidation and cytotoxic activities against HL-60 and PC-3 cells are reported.
Chitosan is a natural polysaccharide that has become of great interest due to its multiple possible applications, which is a great challenge for both the scientific community and the food industry. Chitosan offers a wide range of food applications, including formation of biodegradable films and coatings, immobilizatio…
Abstract The mineralogical characteristics of Ordovician and Silurian K-bentonites in the Baltic Basin were investigated in order to understand better the diagenetic development of these sediments and to link illitization with the tectonothermal evolution of the Basin. The driving mechanisms of illitization in the Bal…
We describe the fabrication of a biomimically designed superhydrophobic poly(ε-caprolactone) surface, which was obtained using a modified electrostatic process. The fabricated surface exhibits a micron-sized pyramid structure consisting of accumulated droplets and nanofibres. By using this simple one-step process, we…
This paper deals with the structure and the optical properties of thin As40S60 − xSex films doped with silver. The refractive index n and the optical band gap Egopt were calculated from the transmittance and reflectance spectra. The results showed that the photo-doping leads to increase in the refractive index by abou…
The microstructures and conductivities of lead-free ceramics [Bi 0.5 (Na 1- x K x ) 0.5 ]TiO 3 with x = 0.18 (BNKT) and lead-based ceramics of x (0.94PbZn 1/3 Nb 2/3 O 3 + 0.06BaTiO 3 ) + (1 - x )PbZr y Ti 1- y O 3 with x = 0.5, y = 0.52 (PBZNZT) were investigated. Experimental results show that the activation energy…
Si‐O‐Si bond vibrations within silicate materials produce a prominent absorption feature in the 8–12 μ m region of thermal infrared (TIR) spectra. The wavelength position of this absorption varies with SiO 2 content and may be used to determine rock composition. However, the presence of glass greatly affects the measu…
The structure and properties of the oriented poly(vinyl alcohol) fibers modified with nanodiamonds (NDs) and nanodiamond soot (NS) of detonation synthesis were investigated by wide-angle and small-angle X-ray scattering methods, as well as by electron microscopy and mechanical testing methods. It was shown that the in…
New thermoplastic insulating compounds, High Performance Thermoplastic Elastomer (HPTE), were developed in Prysmian and represent a breakthrough in the field of MV and HV power cables. These materials gather good electrical and thermomechanical properties, comparable or even superior to those of XLPE, and are flexible…