Materials Literature
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Abstract The wetting characteristics of hyperbranched polyesters (HBP) added cyclic olefin copolymer (COC) melt in microchannels of anodized alumina oxide (AAO) template were studied. The wetting displacements in microchannels were measured by scanning electronic microscopy (SEM). Compared with pure COC matrix, the co…
Based on infrared microscopic studies, we show that clusters of impurity nickel atoms are uniformly distributed over the entire volume of the silicon crystal; by varying the density of the clusters in silicon exposed to γ-radiation, it is possible to control the concentration of the electroactive atoms and the structu…
Crystalline surface species were observed at the surface of polyamide 12 materials upon accelerated aging. After detection of the depositions with scanning electron microscopy (SEM), the crystalline surface precipitations were analyzed with Fourier transform infrared (FT-IR) and Raman imaging microscopy. These surface…
A present trend in aircraft design is the increasing use of 270-Vdc power circuitry. Also, significant voltage spikes may be superimposed on the dc level. In many situations involving unsealed equipment enclosures, electrical insulation is provided by a combination of gaseous medium and spacing between conductors. Con…
The extraction of collagen from fish scales with papain under ultrasonic pretreatment was conducted in this paper. The effects of the ultrasonic pretreatment time, the ratio of papain to fish scales, the extraction temperature and the extraction time on the extraction rate of collagen were investigated by single facto…
Carbon nanotube (CNT) reinforced alumina matrix nanocomposite was successfully synthesized by two different techniques. In the first process sol-gel method was used to generate 3 wt% homogeneously distributed CNT in alumina matrix after sintering. In another novel method chemical mixing process was adopted for synthes…
Six new photosensitive and optically active poly(amide-imide)s 8a–8f with good inherent viscosities based on dibenzalacetone moiety were synthesized from the direct polycondensation reaction of N-Trimellitylimido-L-amino acids 3a–3f with 2,5-bis(4-aminobenzylidene)cyclopentanone 7 by two different methods such as dire…
Two new compounds, along with two known compounds, were isolated from the barks of Parabarium huaitingii, and their structures were determined as 5α-pregn-6-ene-3β,17α,20(S)-triol-20-O-β-d-digitoxopyranoside (1), cymaropyranurolactone 4-O-β-d-digitalopyranosyl-(1 → 4)-O-β-d-cymaropyranosyl-(1 → 4)-O-β-d-oleandropyrano…
Magnetic measurements and TEM analysis have been carried out in order to investigate the activation volume and its correlation with physical grain size within plasma sputtered Co2FeSi thin films. This has led to a new technique for estimating the volumes of ordered and disordered interfacial regions within granular He…
An infinite grating of identical dielectric cylinders placed periodically in free space and illuminated by a plane wave is investigated. Numerical and analytical solutions are derived for the E and H-polarisation cases. The study is focused on the ultra high-Q resonances at the frequencies close to the Rayleigh “anoma…
Hexagonal K2W4O13 nanorods have been synthesized by hydrothermal treatment of the WO3 x H2O precipitate at 180 degrees C in the presence of K2SO4. The K2W4O13 nanorod single crystals of approximately 12 nm in diameter and tens to few hundreds nm long with the principal axis along the (001) direction were obtained when…
This investigation deals with an easy method to develop electrical conductivity in polycarbonate (PC)/multi-wall carbon nanotube (MWCNT) nanocomposites with low loading of MWCNT. This was achieved by melt-blending of in-situ bulk polymerized low molecular weight poly(methyl methacrylate) (PMMA)/MWCNT nanocomposites an…
A mesoporous structure of self-assembled nanocrystals of cubic ZnS doped with Mn2+ ions with a homogeneous distribution of pores of similar size was synthesized at room temperature by a surfactant-assisted liquid-liquid reaction. The component nanocrystals exhibit a high crystallinity and a tight size distribution cen…
Silicon dominates the electronic industry, but its poor optical properties mean that it is not preferred for photonic applications. Visible photoluminescence (PL) was observed from porous Si at room temperature in 1990, but the origin of these light emissions is still not fully understood. This paper reports that an S…
Blends composed of isotropic linear poly (n-butylacrylate) of molecular weight M w = 112,000 g mol−1 and the commercial four-component nematic low molecular weight liquid crystal (LC) mixture E7 exhibit a strong shift of the single nematic–isotropic transition temperature T NI compared to that of the pure LCs, which w…
In this work we have studied the magnetic properties of room temperature electrodeposited Cu2O layers doped with Co. These layers showed anhysteretic ferromagnetic behavior with Curie temperature of 550 K. Structural characterization indicated the incorporation of Co+2ions to the Cu2O lattice. No evidences for the exi…
Well-defined 1-D ZnO and ZnO:Cu semiconductor nanostructures have been fabricated by a low temperature solution process. Cu (0.073 nm) is chosen as a dopant due to the similar ionic radius with Zn (0.074 nm). The radius of ZnO:Cu nanorods observed by FE-SEM is lager than that of pure ZnO which indicates the growth rat…
This paper presents results of space charge and conduction current measurements performed at three different temperatures on epoxy resin samples containing micro and nano fillers. The base material is modified by silica with different filler content (ranging from 0 to 65% in weight for the micro filler and 0 to 5% for…
Magnetic properties and magnetocaloric effect were investigated on La0.5+xPr0.5Fe11.4Si1.6Hy(x=0, 0.1, 0.2) melt-spun ribbons. It was found that NaZn13-type phase could be obtained easily owing to that the segregation of α-Fe phase was suppressed obviously by adding appropriate amount of La after a short time annealin…
A meshed patch antenna fabricated with carbon nanotube thread is proposed for multiple applications, including communications and chemical/gas sensing. Full wave simulation results of the meshed patch antenna are presented to demonstrate its use as a communications antenna and to predict its performance as a chemical/…