Materials Literature
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Degradation of chitosan in solution under the action of redox radical initiators was studied with the aim to prepare chemically oligomers of natural polysaccharides. The influence of temperature on the rate and extent of the process was examined. The optimal ratios of the substrate to initiator and of the reductant to…
The influence of deposition conditions on the antireflection properties of diamond-like carbon films for Si-based solar cells is studied theoretically. The values of the short-circuit current density for Si solar cells covered by diamond-like carbon films deposited at different concentrations of nitrogen in the gas mi…
A scheme of purification of malate dehydrogenase from Macromonas bipunctata strain D-405 and Vulcanithermus medioatlanticus DSM 14978T was developed. This scheme was used to obtain electrophoretically homogeneous enzyme preparations of the mesophilic bacterium M. bipunctata (specific activity, 26.9 +/- 0.8 U/mg protei…
A new approach is proposed for explaining the experimental data on sonoluminescence of acoustic and laser-induced cavitation bubbles. It is suggested that two different sonoluminescence mechanisms, namely, thermal and electric ones, are possible and that they manifest themselves depending on the bubble dynamics. An in…
This paper describes our progress achieved in thin-film free-standing monocrystalline silicon (FMS) solar cells by layer transfer process using porous silicon. The highest cell efficiency achieved for a 1times1 cm2FMS solar cell is 13.5% with an open circuit voltage Voc=612 mV, current density Jsc=28.9 mA/cm2and fill…
Abstract Green rust 2 (GR2(SO 2− 4 )) was detected amongst the products formed on a carbon steel rod exposed to atmospheric corrosion using X‐ray diffraction (XRD). The presence of green rust 2 has been related to sulphate reducing bacteria (SRB) in the sea spray. These were detected using test catch rods made out of…
Platinum has been introduced into pillared clay as a complex with the organosilicon amine N’ -[3-(trimethoxysilyl)propyl]diethyltriamine, as a complex with the organosilicon amine and zirconyl chloride, as an ammine complex, and by impregnation with a chloroplatinic acid solution followed by hydrogen reduction. The ca…
A crucial factor in the tissue engineering of heart valves is an effective cell seeding with uniform cell distribution on biodegradable scaffolds to eventually form functional tissue constructs in vitro. In our laboratory, we developed a new cell-seeding device for optimal cell distribution for tissue-engineered heart…
Abstract For improving the performance of ceramic thermoelectric materials an increase in the effective mass is required because it is the main factor determining the Seebeck coefficient, in the case of a semiconductor with sufficiently high carrier concentration. The Ruddlesden–Popper phase Sr 3 Ti 2 O 7 , with its c…
A multi-scale analysis is presented to parametrically describe the Mode I delamination of a carbon fiber/epoxy laminate. In the midplane of the laminate, carbon nanotubes are included for the purposes of selectively enhancing the fracture toughness of the laminate. To analyze carbon fiber epoxy carbon nanotube laminat…
The crystal structure of the [Tb(BTFA) 2 (NO 3 )(TPPO) 2 ] complex (TPPO is triphenylphosphine oxide, BTFA is benzoyltrifluoracetone), which exhibits strong triboluminescence, has been established by X-ray crystallography. The crystals are triclinic: a = 11.668(3) Å, b = 11.700(3) Å, c = 12.512(3) Å, α = 65.161(4°), β…
Studies into the properties of polymer-wood composites (PWC) are mostly focused on thermoplastics as the matrix phase and wood flour as a reinforcing phase. This article aims to identify the optimum contents of wood sawdust fibre and silane coupling agent to be introduced into natural rubber (NR) compounded with carbo…
Purpose The paper aims to present several methods that were developed, evaluated and finally used as part of a 3D electronic tailor especially adapted to the clothing industry. Design/methodology/approach An experimental top down approach taking care of building a system adapted to the constraints of the textile indus…
The transverse crack, a type of cold crack, occurs perpendicular to the welding direction. From experience, preheating and interpass temperature are important factors in cold crack occurrence. Transverse cracks were detected in the specimen welded with 70°C preheat and an interpass temperature below 30°C; cracks were…
Abstract The present study gives an overview on the potential, possibilities and perspectives that the synthesis of functional materials, such as BaTiO 3 , with microemulsions as the reaction medium offers. Well defined nanocrystalline particles in the form of powders for further ceramic processing, as well as stable…
Soda lime glass was thermally poled at 280°C with dc voltages up to 2kV. Second-order nonlinearity was found in a layer ∼1.7μm beneath the anode surface with second-harmonic microscopy. Scanning electron microscopy was employed to examine the microstructure of the poled glass under the anode. In the depletion region,…
Systematic investigation on the deposition of thin silicon-carbon-nitride films by reactive rf magnetron sputtering from SiC–C composite target in nitrogen-argon atmosphere was studied. The significant effect of deposition pressures on the hardness of the deposited SiCN films was found, which varied between 4.7 and 44…
A multiscale modeling strategy is developed to study grain boundary fracture in polycrystalline aluminum. Atomistic simulation is used to model fundamental nanoscale deformation and fracture mechanisms and to develop a constitutive relationship for separation along a grain boundary interface. The nanoscale constitutiv…
Les sols céréaliers du Nord-Ouest de la Tunisie dérivent la plupart du temps d'apports alluviaux ou des débris d'altération des roches carbonatées argileuses. L'extraction de la fraction argileuse de quatre types représentatifs de ces sols a permis de mettre en évidence les minéraux argileux suivants : kaolinite, illi…
Collision‐induced breakup resulting from binary collisions of large drops has been investigated in the past by very few laboratory experiments. This process is here investigated using a 3D‐CFD program based on direct numerical simulation. Besides same drop pairs as considered in the measurements also a number of addit…