Materials Literature
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The focusing properties of a photonic-crystal (PC) slab consisting of a square lattice of rectangular dielectric rods in the air background are studied theoretically. We employ the finite-difference time-domain method to investigate the field patterns of a point source placed in the vicinity of the PC slab and find th…
We have measured a resonant Raman scattering from polycrystalline silicon (poly-Si) films with thicknesses of 24–381nm at the depth resolution of approximately 5nm and found that poly-Si films are under compressive stress. The main Raman peak in poly-Si films tends to shift to a higher frequency as the thickness of th…
The objective of the present study, an extension of a recent one, is to inter-compare the utility of the various isothermal three-parameter equations of state (EOSs) of solids, considered viable at different stages in the development of the EOS field, spanning over a period of about a century now. In a recent paper we…
Abstract Particulate‐reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering polymers. In general, the performance of filled polymers is decided on the basis of the interface attraction of filler and polymers. Therefore, a coupling agent, tetra isopropyl…
Nanoscaled TiO2 powders with narrow size dispersion were prepared in supercritical carbon dioxide via non-hydrolytic acylation/deacylation of titanium alkoxide precursors with or without tris-fluorination. The microstructures of these powders were characterized by spectroscopic (FTIR, TGA, and XRD), microscopic (SEM o…
Einfaches Senken der Temperatur überführt das polarisierbare molekulare System aus H2O und CH3OH im porösen Kristall [Mn3(HCOO)6] (siehe Struktur; Mn rosa, C grau, O rot) in ein nichtpolarisierbares. Obwohl die drastische Abnahme der Dielektizitätskonstante bei etwa 120 K einen Übergang der Gastmoleküle zwischen flüss…
Ethanol decomposition on the clean Pt(111) surface has been studied in the zero-coverage limit within the framework of the unity bond index-quadratic exponent potential (UBI-QEP) model. Previous work, both experimental and theoretical, was already available in the literature on this reaction. The system has therefore…
In oxide grain boundaries (GBs), oxygen ions and their vacancies serve as a common denominator in controlling properties such as GB barrier height and capacitance. Therefore, it is critical to analyze, control and manipulate oxygen and vacancies at oxide interfaces as most of the practical devices are almost always in…
Verbrückt: Ein heterogenisierter freitragender Binol/La-Shibasaki-Katalysator wurde durch die Reaktion multitoper Liganden mit La(OiPr)3 synthetisiert (siehe Bild). Der Katalysator zeigt eine hohe Aktivität und Enantioselektivität sowie Wiederverwendbarkeit bei der asymmetrischen Epoxidierung von α,β-ungesättigten Ket…
High pressure effects on the structural and vibrational properties of antiferromagnetic KFe(MoO4)2 , Maczka, M, Pietraszko, A, Saraiva, G D, Souza Filho, A G, Paraguassu, W, Lemos, V, Perottoni, C A, Gallas, M R, Freire, P T C, Tomaszewski, P E, Melo, F E A, Mendes Filho, J, Hanuza, J
Abstract A biodegradable block copolymer, poly‐ D , L ‐lactide (PLA)‐ co ‐poly(ethylene glycol) (PEG), was prepared by the ring‐opening polymerization of lactide with stannous caprylate [Sn(Oct 2 )] as a catalyst; then, the PLA–PEG copolymer was made into nanoparticles by nanoprecipitation under different conditions.…
A power analysis of the lossy negative refractive index or left-handed slab lens is described. The presence of vortices in the image plane is revealed with small loss or gain, and these are attributed to the influence of field growth in the evanescent spectrum.
High resolution (0.04 cm −1 ) absorption spectra of Dy 3+ -doped YAl 3 (BO 3 ) 4 (YAB) single crystals were measured by Fourier transform spectroscopy in the spectral (2000–23 000 cm −1 ) and temperature (9–300 K) ranges. Samples with nominal 1 and 4% Dy/Y molar ratios were studied. Dy 3+ transitions from the 6 H 15/2…
Spectroscopic ellipsometry has been used to examine the pH-responsive interfacial adsorption of a series of biocompatible diblock copolymers incorporating 2-methacryloyloxyethyl phosphorylcholine-based (MPC) residues and 2-(dialkylamino)ethyl methacrylate residues, with a specific focus on 2-(diethylamino)ethyl groups…
Abstract Novel hyperbranched poly(amido amine)s containing tertiary amines in the backbones and acryl as terminal groups were synthesized via the Michael addition polymerizations of trifunctional amines with twofold molar diacrylamide. The hyperbranched structures of these poly(amido amine)s were verified by 13 C NMR…
We present a numerical study of resonant negative refractive index (NRI) metamaterials in which their effective parameters are calculated. For a periodic media consisting of split-ring resonators and metallic wires the effective refractive index is compared by means of two different methods. The first one is an invers…
This study focuses on the structure and magnetic properties of Y-type hexagonal ferrite, especially the tunable permeability controlled by the direct current (dc) magnetic field. The composition of Ba2Zn1.2−xCoxCu0.8Fe12O22 (x varied from 0 to 1.2) is selected, where the changes in the amount of Zn and Co is to tailor…
SANS has not been successfully applied to study the structure of semicrystalline polyolefins without deuterated polymers because of the fundamental limitation of negligible contrast between the crystalline and amorphous phases in spite of the mass density difference. The proposed in situ vapor sorption SANS technique…
We investigate theoretically the angular distributions and the rainbows of 1 GeV protons channeled in the ropes of (10, 0) single-wall carbon nanotubes. The rope length is varied between 0.53 and 5.29 µm. The angular distributions of channeled protons are generated using the numerical solution of the proton equations…
A Fourier method to connect segmented intensity data measured with a multiple-detector system (MDS) for powder diffractometry has been developed. Differences in sensitivity, slight shifts in peak positions and asymmetric instrumental broadening for different detectors are simultaneously adjusted by a Fourier-based dec…