Materials Literature
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Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical prop…
Abstract Condensation reactions between a carboxyl terminated polyamide 12 and a dioxazoline carried out by reactive extrusion have been characterized in the first part of this study. In the present paper, we focus on the influence of extrusion conditions on reaction progress. Influences of screw profile, screw speed,…
Scientists and engineers have long envied spiders’ ability to manufacture a material that is simultaneously strong, fine, and tough. This combination of properties makes spider silk an extremely attractive candidate for numerous applications in medicine, defense, and the leisure industry. Research teams worldwide are…
Abstract Flowable fill is a self-compacted, cementitious material used primarily as a backfill in lieu of compacted fill. It is generally a mixture of sand, small amount of cement, fly ash, and water. Sand is the major component of most flowable fill mixes. Waste materials such as fly ash, ground granulated blast furn…
Abstract NIR spectroscopy in the transmission mode and thermogravimetric analysis were used to predict diffusion of water into polyamide 6,6 samples immersed in water at 40, 60, 75 and 90 °C for different periods of time. The sorption curves between 40 and 75 were sigmoidal indicating that the surface concentration wa…
Abstract Development of alternative cathode materials, has been a main strategy for solving the cathode dissolution problem of the Molten Carbonate Fuel Cell (MCFC). Ternary compositions of LiFeO 2 , LiCoO 2 and NiO are expected to combine some desirable properties of each component. Preliminary studies on LiFeO 2 ‐Li…
Experimental centrifugally cast high speed steels (HSSs) with a modified solidification microstructure were produced, with the aim of improving impact properties and thermal fatigue resistance to extend the application of these materials to the production of roughing and intermediate finishing hot rolls. On the basis…
A silicide coating was prepared on Ti3SiC2- based ceramic by pack cementation to improve the oxidation resistance of Ti3SiC2, which is a technologically important material for high temperature applications. The microstructure, phase composition and oxidation resistance of the coated sample were investigated. The resul…
Abstract The development of heterophasic PP-copolymers, which are necessary in many applications because of their specific property profile, requires large capacities in pilot plants (or at least in bench-scale reactors) for a systematic variation of the matrix and elastomer properties. A possible alternative are mode…
Crystals of the (NH 4 ) 2 SO 4 ammonium sulfate are studied using x-ray diffractometry. It is revealed that the temperature dependence of the lattice parameters exhibits an anomalous behavior, namely, a global hysteresis, and an anomalous increase in the lattice parameter a and the unit cell volume at temperatures bel…
Acrylic/nano-TiO 2 composite latex samples were prepared via high-shear stirring and mixing (SM), ball milling and mixing (BM) and in situ polymerization (IS) methods, and investigated by transmission electron micrography (TEM), testing with an Instron machine, dynamic mechanical analysis (DMA) and ultraviolet-visible…
Abstract The crystallization kinetics of isotactic polypropylene (iPP) depends not only on the undercooling but also on its microstructure characteristics. In this paper the effect of isotacticity distribution on the isothermal kinetics of iPPs in the crystallization regime III was examined by differential scanning ca…
Abstract This paper describes thermally enhanced in‐plane and out‐of‐plane reorientation of mesogenic groups in copolymer liquid‐crystal (CPLC) films that have a photo‐cross‐linkable 4‐(4′‐methoxycinnamoyl)biphenyl (MCB) side group and a 4‐methoxybiphenyl (4MB) side group. The side groups are cross‐linked by irradiati…
BACKGROUND: Lumbrokinase (LK) is a fibrinolytic enzyme purified from the earthworm Lumbricus rubellus. To investigate the fibrinolytic and antithrombotic effects of lumbrokinase, a series of animal experiments were performed. METHODS: The Dacron graft (3 mm in diameter, 3 cm in length) were treated with LK via two dif…
Abstract This paper investigates the extensional rheology (through melt strength measurement) of calcium carbonate (CaCO 3 ) filled polypropylene (PP) melts. Different concentrations of CaCO 3 filled PP were produced by mixing two master batches of pure PP and 70 wt% CaCO 3 filled PP in required proportions in a count…
An optimization method for the sensitivity of diffraction efficiency measurements is presented. I define the sensitivity as the estimation precision of the grating parameters. The optimization method called sensitivity analysis for fitting scans all the possible measurement configurations and selects the configuration…
A series of 1,4-piperazinium di-n-alkyl sulphates was synthesized and compared with an analogous series of 1,5-homopiperazinium di-n-alkyl sulphates. Their thermotropic liquid crystalline behaviour was studied by differential scanning calorimetry, polarizing optical microscopy and X-ray diffraction. For the piperazini…
The genus Coleochaete Bréb. is a relatively small group of freshwater microscopic green algae with about 15 recognized species. Although Coleochaete has long been considered to be a close relative of embryophytes, a comprehensive study of the genus has not been published since Pringsheim's 1860 monograph. As part of a…
Abstract Dielectric spectroscopy was applied for the first time to aramid fiber‐reinforced PEEK, wherein the effect of the fiber on the dielectric response was examined for both amorphous and crystalline poly(ether ether ketone) (PEEK) over wide temperature and frequency ranges. Whereas the temperature behavior of the…
In this paper, the formation of glass-forming reactive mesogens, that do not crystallize upon cooling, but vitrify and form supercooled LC phases, is described. These molecules exhibit broad range LC phases and enable us to carry out photopolymerization in a broad range of temperatures. From such reactive mesogens den…