Materials Literature
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Abstract The liquid crystal display (LCD) technology is confronted with the task to substitute rigid glass plates enclosing the electro‐optically active liquid crystal (LC) material by plastic substrates. In particular, the commercialization of flexible displays requires a sufficient stabilization against external mec…
Polypyrrole (PPY) microbelts are synthesized via the absorbent cotton template for the first time. PPY microbelts are characterized by Fourier transform infrared spectroscopy. The stability, the morphology and electrical conductivity of such microbelts are evaluated by means of scanning electron microscope, thermo-gra…
Rape oil-based fatliquors were prepared by different synthesis methods; the variants including sulfated, sulfonated, oxidized-sulphited, phosphated and copolymerization. Their biodegradability was investigated by evaluations of the respiration, BOD5/COD values and COD, TOC removal ratios. The results indicate that the…
Abstract The microstructure of the CuNi alloy specimen ER is mainly elongated coarse grains. However, the microstructure of the specimen EH is inhomogeneous and some recrystallized sub‐grains form. In addition, the misorientation angles of the specimens ER and EH are mainly smaller than 15°, showing a feature of low‐…
We presented an anisotropic plasma etching technique by reactive ion etcher (RIE) as a new pretreatment method of fabrication of ionic polymer-metal composite (IPMC). We already found that the new technique provided large displacement to the fabricated IPMC in the presence of low applied voltage. However, we did not e…
The formation of nanocrystalline calcium carbonate phosphates doped with Fe 2+ , Mg 2 , Zn 2+ , K + , Si 4+ , and Mn 2+ has been studied by X-ray diffraction, IR spectroscopy, differential thermal analysis, and energy dispersive X-ray fluorescence analysis. The results indicate that the synthesis involves the formatio…
First principles calculations within the framework of the density functional theory with ultrasoft pseudopotentials and plane-wave wavefunctions basis set were performed to investigate the electronic and crystallographic structure of chromium nitride. Different types of antiferromagnetic orderings were considered in t…
Erbium-doped low-dimensional Si films with different microstructures were grown by reactive magnetron sputtering on glass substrates by varying the deposition parameters. Their structure and chemical composition were studied by micro-Raman and Rutherford backscattering spectrometry, respectively. In this contribution…
Positron annihilation induced Auger electron spectroscopy (PAES) enables almost background free, non-destructive surface analysis with high surface selectivity. The Auger-spectrometer at the high intense positron source NEPOMUC now allows to record positron annihilation induced Auger spectra within a short data acquis…
It was demonstrated that size of the Ag nanoparticles array fabricated by nanosphere lithography (NSL) can be changed as needed by reactive ion etching (RIE) of the self-assembled polystyrene (PS) nanosphere template and post-annealing of the Ag particle array. A macroscopic 2D array of ordered Ag nanoparticles stretc…
Porous SiC ceramics with high porosity and high strength were fabricated by gelcasting, with tert-butyl alcohol (TBA) as solvent, acrylamide (AM) as monomer, and in-situ reaction bonding with a-Al2O3 as sintering additive. SiC suspension with 10 vol% solid loading was successfully solidified by gel-casting to form hig…
In this paper we propose a new parameter dM∗/dN as the fatigue damage driving force (FDDF), which is based on the M-integral concept and the L-integral concept classically used in crack problems. Both analytical treatments and experimental observations are performed for many plane Aluminum strips with two neighborly a…
Electrode effects can play an important role in ion-conducting polymers in which a space charge polarization of mobile internal ions prevails. The ions are shifted in an external field and they are attracted to the electrodes due to Coulomb forces caused by their own image charges. These image charges influence the st…
Experiments aimed at comparison of calculated and experimental intrinsic viscosities of PS and PMMA in some binary solvents used as eluents in chromatography are performed. The intrinsic viscosities are determined in mixed solvents of different thermodynamic qualities, including a θ solvent, in a wide composition rang…
We perform a series of molecular dynamics (MD) simulations to investigate the heat transport in Si nano-structures, while explicitly including oxide cover layers in the simulation system for the first time. The dependences of thermal diffusion velocity on the thicknesses of the SiO2 film and Si lattice are investigate…
A photovoltaic quantum dot infrared photodetector with InAs/GaAs/AlGaAs structures is reported. The detector is sensitive to normal incident light. At zero bias and 78K, a clear spectral response in the range of 2–7 μm has been obtained with peaks at 3.1, 4.8 and 5.7 μm. The bandgap energies of GaAs and Alo.2Gao.sAs a…
The characteristic features of the interaction of nickel and cobalt oxide nanofilms deposited on the GaAs substrate with the substrate surface during thermal oxidation have been considered. The mechanism of influence of the oxides under investigation on the thermal oxidation of the semiconductor, as well as on the com…
The initial stage of the loss of the morphological stability by spherical particles during quasi-stationary crystallization has been analyzed numerically. Axial disturbances of arbitrary amplitudes have been considered. Boundaries of the regions of coexistence of different morphologies have been established. The hypot…
Abstract The test results from a composite material round robin manufacturing study are presented. The objective of the study was to investigate material property variability when different manufacturers were used to fabricate identical composite parts. The study was part of an ongoing Office of Naval Research project…
Abstract The crystal structure of byzantievite, Ba 5 (Ca, REE ,Y) 22 (Ti,Nb) 18 (SiO 4 ) 4 [(PO 4 ),(SiO 4 )] 4 (BO 3 ) 9 O 21 [(OH),F] 43 (H 2 O) 1.5 , a new mineral from the moraine of the Dara-i-Pioz glacier, the Alai mountain ridge, Tien-Shan Mountains, northern Tajikistan, was solved by direct methods and refined…