Materials Literature
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Abstract Under mild ambient conditions gallium phosphide (GaP) nanoparticles were employed to carry out the reduction of nitrogen. By using Nessler's reagent ammonia was detected in the slurry where the aggregated GaP particles were suspended in water and bubbled by pure nitrogen. Dependence of the concentration of am…
This paper details to an electromagnetic modeling of an extreme ultraviolet (EUV) lithography mask. For that purpose, a modal method based on a spline nodal expansion (MMSNE) is presented. The results obtained using first, and second-order splines as basis functions are compared with those obtained using other modal m…
Based on optical and SEM microscopic observations, the projections of the outer surface of the periostracum and inner micro-structures of the shell are described and redefined. The outer surface of the periostracum is practically smooth in both species. Considering a mesoscopic view of the periostracum, A. trapesialis…
The dielectric properties of lead titanate [PbTiO 3 ] and lanthanum-modified lead zirconate titanate [PLZT, Pb 0.91 La 0.09 (Zr 0.65 Ti 0.35 )O 3 ] films, prepared by aerosol deposition (AD), were measured in the frequency range from 100 GHz to 10 THz and in the kHz range. THz time-domain spectroscopy was applied for…
Nanocomposite structures of a metal and an alumina matrix were prepared by depositing a metal into holes in anodic porous alumina using vacuum deposition. The process, which was composed of sequences of metal deposition into straight holes and then peeling of the deposit on the surface, induced an almost uniform filli…
The systematic study of the influence of La, Li, Na, K and Bi dopants on structural (lattice parameters and particle size) and electrical (dielectric constant, dielectric loss and piezoelectric coefficients) properties of PZT have been reported. The observed single phase rhombohedral structure implies that dopants and…
The effects of hydrostatic pressure on the luminescence spectra of tetragonal transition metal complexes with nondegenerate electronic ground states are analyzed quantitatively by means of models based on potential energy surfaces defined along normal coordinates. Pressure-induced changes of intensity distributions wi…
Blends of styrene-co-butadiene rubber (SBR) and acrylonitrile-co-butadiene rubber (NBR) were prepared and their rheological and mechanical properties were examined. The effect of the addition of 5 phr of poly acrylonitrile as compatibilizer on the compatibility of the rubber blend was studied. Ultrasonic and scanning…
The preparation of transparent nanoceramics from nanocrystalline Y3Al5O12 (YAG) powders doped with rare-earth ions has been described and the results of investigation of the structure and morphology have been presented. Decomposition of YAG nanocrystals into YAlO3 (YAP) was observed. The temperature and pressure for t…
In discussing hardening characteristics in terms of crystalline lattice defects, in most cases the properties and kinetics of dislocations and their arrangement have been considered. However, during plastic deformation also vacancies and/or vacancy-type defects are produced in very high densities which are typically c…
Conducting polyaniline/BaTiO 3 (PANI/BT) composites have been synthesized by ‘in situ’ deposition technique by placing fine graded BaTiO 3 in polymerization mixture of aniline. The composites are characterized using various techniques such as SEM, XRD and IR spectroscopy. The electrical properties such dc conductivity…
Abstract Unvulcanized and vulcanized SBR samples with styrene content of 18 and 23.5% were used to investigate the effect of ultrasound treatment on their structural characteristics. Gel fraction and crosslink density of gel are measured. Molecular weight and molecular weight distribution of sol are studied to determi…
The copolymerization of N-Methylpyrrole (N-MPy) and N-ethylcarbazole (ECz) by chemical and electrochemical methods is investigated in detail. Random copolymers of poly[N-Methylpyrrole-N-ethylcarbazole], P[N-MPy-co-ECz], were synthesized in the presence of ceric ammonium nitrate (CAN) in acetonitrile. Electrocopolymeri…
Elastic deformations of homeotropic nematic liquid crystal layers subjected to a d.c. electric field were studied numerically in order to find the dependence of threshold voltage on the properties of such a system. A nematic material characterized by a negative sum of flexoelectric coefficients and by a small negative…
We present accurate calculations and tabulations of the volume and midplane-averaged complex ac susceptibilities of nonmagnetic conducting cylinders with aspect ratio ranging from 0.1 to 10 as functions of a dimensionless frequency. We discuss their features in terms of eddy-current demagnetizing effect. We explain th…
Abstract Cupric acetate dissolved in methanol was applied, for the first time, to the synthesizing of Y‐junction carbon nanotubes (CNTs). This was done by catalytic CVD of the methanol solution at 1000–1200 °C. Based on the bamboo structure, which was observed for the first time within Y‐junction CNTs, it is suggested…
Uma alumina de elevada pureza dopada com MgO foi sinterizada entre 1300 e 1700 °C para preparação de corpos com diferentes porosidades. Foram determinadas a resistência à flexão em quatro pontos, a tenacidade à fratura pelo método SEVNB, a dureza Vickers, as velocidades sônicas (longitudinal e transversal) e as consta…
A series of water-soluble tri-anionic and -cationic substituted phthalocyanines has been synthesized via iodinated boron subphthalocyanines. The latter were opened with differently substituted diiminoisoindolines via the Kobayashi ring expansion reaction followed by metal insertion to exclusively yield the asymmetrica…
Abstract A biodegradable, immiscible poly(butylenes adipate‐ co ‐butylenes terephthalate) [P(BA‐ co ‐BT)]/poly(ethylene oxide) (PEO) polymer blend film with compositional gradient in the film‐thickness direction has been successfully prepared in the presence of a low‐molecular‐weight compound 4,4′‐thiodiphenal (TDP),…
Some properties of the remarkable Ti3SiC2 based ceramic synthesised by hot pressing of elemental Ti, Si, and C powders have been investigated. Its flexural strength by using three point bending tests and fracture toughness by using single edge notched beam tests were measured at room temperature to be in the range 310…