Materials Literature
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Abstract Biodegradable blend films from rice starch–chitosan were developed by casting film-solution on leveled trays. The influence of the ratio of starch and chitosan (2:1, 1.5:1, 1:1, and 0.5:1) on the mechanical properties, water barrier properties, and miscibility of biodegradable blend films was investigated. Th…
Drug delivery, magnetic resonance andfluorescence imaging, magnetic manipulation, and cell targetingaresimultaneouslypossibleusingamultifunctionalmesoporoussilicananoparticle.Superparamagnetic ironoxidenanocrystalswereencapsulatedinsidemesostructuredsilicaspheresthatwerelabeledwithfluorescent dye molecules and coated…
Dyneema composite panels, which contain high Ultra High Molecular Weight Polyethylene fibers, are used in armor applications. They give good protection against fragments, bullets or other projectiles. In order to be able to study the internal processes in such a composite panel, a new modeling approach is developed an…
The growth of monoclinic Ga2O3 nanowires, nano-ribbons and nano-sheets has been investigated. Results indicate that high quality single crystal nanowires can be grown at 900?C using an Au catalyst, while single crystal nano-ribbons and nano-sheets require no metal catalyst for growth. Since bulk Ga2O3 is a promising m…
Si3N4/SiC composite containing Y2O3 as sintering additive was hot-pressed to examine their crack-healing behavior as a function of oxygen partial pressure (pO2 = 50–21,000Pa). A semi-elliptical surface crack with length of about 100μm was introduced on the center of tensile surface by the indentation method. These spe…
Magnesium-niobium (Mg-Nb) thin films with a palladium (Pd) top layer were prepared on glass substrates by means of DC magnetron sputtering deposition, at room temperature. A Mg-Nb thin film with a Pd top layer can be switched to a transparent state from a mirror-like state by loading with 4% hydrogen gas. The optical…
The terminology of strain induced or altered boundaries should reflect the mechanism that created them and the function they perform; both are related to the regions they surround or separate. Dislocation glide under applied stress is the primary mechanism in creep (higher rate) and hot, warm and cold working, being l…
Photochromic glassy liquid crystals were synthesized using dithienylethenes as the volume-excluding cores to which liquid crystalline mesogens were chemically bonded through alkyl spacers. Nematic, smectic, and cholesteric glassy liquid crystals were demonstrated with glass transition temperatures above 90 °C and clea…
Germanium zinc diarsenide crystals with various manganese fractions, (ZnGeMn)As 2 , were prepared by reacting high-purity powders of zinc diarsenide, germanium, arsenic, and manganese. The manganese solubility at temperatures near the ZnGeAs 2 melting temperature was 3.5 wt % as determined by X-ray fluorescence analys…
Asymmetric plate impact experiments are conducted on LY12 aluminium alloy in a pressure range of 85–131 GPa. The longitudinal sound speeds are obtained from the time-resolved particle speed profiles of the specimen measured with Velocity Interferometer System for Any Reflector (VISAR) technique, and they are shown to…
Nitrogen-enriched carbon materials were prepared by the heat-treatment of polyaniline (PANT). The electrochemical capacitance of the carbonized PANI in 1.0 mol dm-3 H2SO4 electrolyte depended on the heat-treatment. The carbonized PANI at 800°C showed good cycle performance and 157 F·g-1 of the gravimetric capacitance.…
- The course of waste polyurethane foam glycolysis with 1,4-butylene glycol (BDO) or polyoxyethylene glycol (PEG 300), dependently on PUR foam:glycol weight ratio and the kind of glycolysis agent, was investigated (Table 1, Fig. 1 and 2). Urethane prepolymer obtained from 4,4'--methylene-diphenyldiizocyanate (MDI) and…
Two kinds of micro- and nano-structural surfaces were constructed with hydrophobic nanoparticles(HNPs)directly. One of the surfaces was formed by compressing the nano powder to a smooth slice, the other was made by adsorbing the nanoparticles on the surface of rock wafer. The contact angles between water drops and the…
This paper introduces mechanical models for coated fabrics which can be used for simulation. Both the yarn-parallel and the shear behaviour are described mechanically and compared with test results. It will be shown that with enough accuracy for the practical use the inner energy potential density of normal and shear…
Das Verhalten eines Schmelze-Pools im unteren Plenum eines Reaktordruckbehälters – Überblick über experimentelle Programme und Grundlagen für das LIVE-Versuchsprogramm Die Rückhaltung der Kernschmelze im unteren Plenum des Reaktordruckbehälters (RDB) ist eine der in den letzten Jahren intensiv untersuchten Strategien,…
This paper describes an experimental investigation on the formation of flank build-up (FBU) during the machining of five commercial magnesium alloys.It was demonstrated that the presence of intermetallic β-phase in magnesium matrix is responsible for the difference in the machinability of magnesium alloys.Experimental…
Abstract. The influence of crystallite size on the quality of Rietveld refinement and on the accu-racy of quantitative phase determination by Hill-Howard procedure based on Rietveld analysis was tested. The studies were performed on two four-phase powder samples. The content of phases in both powders was the same and…
Asulphone-nitrogen containing heterocyclic ring, tetraphenylthiophene diamine (TPTDA) was prepared and used as curing agent together with triphenylphosphine (PPh 3 ) to cure diglycidyl ether of a bisphenol A-based epoxy resin (DGEBA). Activation energies (E a ) for curing DGEBA/TPTDA and DGEBA/ TPTDA/PPh 3 systems by…
In this paper we have reported the synthesis of luminescent nanoparticles of Zinc Sulfide (ZnS) with and without capping agent. Nanoparticles of ZnS are prepared by a coprecipitation reaction. Based on Ostwald ripening and surface passivation, we discuss a mechanism for the formation of ZnS nanoparticles. The reaction…
Severe restrictions imposed by the pollution control authorities on chromium have forced tanners to look for possible alternatives that are naturally abundant, easily obtainable, low priced, eco-friendly and offer competitive tanned leather performances. In this study, the interactions of vegetable and aluminum, with…