Materials Literature
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Abstract The liquid crystal acryl compounds, in which the molecular directions were aligned by the rubbing method, were polymerized by UV irradiation, to provide the free‐standing aligned films of 200‐μm thickness. The relation between the thermal conductivity and the aligned molecular direction of the films was inves…
The diatom assemblages within phototrophic biofilms in secondary treatment tanks of the Fiumicino Airport (Rome, Italy) wastewater treatment plant were investigated. Qualitative and quantitative comparisons were made between assemblages in sedimentation and chlorination tanks, on the tank walls and artificial substrat…
The electrochemical behavior and mechanisms of carbon steel cavitation corrosion in neutral sodium chloride (NaCl) aqueous solution were studied by means of the cavitation corrosion apparatus, using the methods of weight loss, electrochemistry, and the observation of scanning electron microscopy (SEM). The results sho…
The differential theory of diffraction of light by an arbitrary object described in spherical coordinates is developed. Expanding the fields on the basis of vector spherical harmonics, we reduce the Maxwell equations to an infinite first-order differential set. In view of the truncation required for numerical integrat…
Background: Ultrasmall superparamagnetic particles of iron oxide are magnetic resonance contrast agents that are gaining use in the CNS. These agents accumulate in phagocytic cells such as reactive astrocytes and macrophages. Aim: We aimed to describe the use of ferumoxtran-10, an ultrasmall superparamagnetic particle…
Atomic layer deposition, a highly uniform and conformal deposition process, was utilized to fill trenches of various high aspect-ratio nano-grating structures. Dielectric (e.g., SiO2), metal (e.g., aluminum), and dielectric/metal (e.g., Au∕SiO2) hybrid nano-gratings with a linewidth down to <50nm and an aspect ratio u…
Recent experiments show that the long looked for thermotropic biaxial nematic phase is finally stabilized in a low mass liquid crystalline system. Inspired by this experimental observation we concentrate on some theoretical issues concerned with this phase. In particular we show that the simplest Lebwohl–Lasher biaxia…
An approach to the refinement of crystal structures by reduced experimental data is developed. The anisotropic method of intermeasurement minimization is used to refine the parameters determining the absorption of radiation in the cases when some factors are not known with sufficient accuracy: the specimen sizes, the…
NiTi shape memory alloys can be used as actor materials and perform mechanical work; they can also be used for damping applications. In combination with polymers their functionality can be increased. Shape memory effects of NiTi alloys are associated with large strains and in a NiTi/polymer‐composite, the polymer can…
In order to evaluate the effect of processing conditions, composites of MaterBi-Y matrix with 15wt% sisal fibers are obtained with different temperature profiles and speeds of rotation of the screw, using a twin-screw extruder. Three different temperature profiles are selected. The speeds of rotation are 25, 60, and 8…
This paper reports the results from the condition assessment of 12- and 24-kV cross-linked polyethylene (XPLE) cables using a technique based on dielectric spectroscopy initially developed at KTH in Sweden. The work aims to examine whether the method could detect water tree degradation for the second generation medium…
Abstract The copper‐containing hydrotalcites (Cu‐HTLcs) are synthesized under microwave irradiation, the effect of rare earth elements (RE) on the synthesis of Cu‐HTLcs, wherein RE stands for rare earth elements, e.g., La, Y, Sm and Ce, is also investigated in the present work. The hydrotalcite structure of the synthe…
Taking advantage of both the self-organizing characteristics and the amphiphilic property of poly(styrene-block-ethyleneoxide) (P(S-b-EO)), we have realized one-step fabrication of nanoelectrode ensembles (NEEs). By choosing the electrolyte solution elaborately, only the poly(ethylene oxide) (PEO) segment in the P(S-b…
Cu nanowires were electrodeposited into the nanopores of self-ordered aluminum oxide films. CuO and Cu2O nanowires were fabricated by oxidizing Cu nanowires in air. Cu nanowires oxidized at 250°C transform only to Cu2O (grain size ∼21nm), they transform to a mixture of CuO and Cu2O above 350°C and finally to CuO with…
Abstract To increase our knowledge of the ultrastructure within softwood fibres, enzymatic treatment, thermoporosimetry, light microscopy, and atomic force microscopy with image analysis were used to investigate the structure of holocellulose softwood pulp fibres. The size of the average cellulose fibril aggregates an…
Rubber-toughened nanocomposites (RTNC) consisting of ternary blends of polyamide 6 (PA6), polypropylene (PP) and polyethylene-octene elastomer (POE) containing 4 wt% of organophilic modified montmorillonite were produced by melt compounding followed by injection moulding. The blend composition was kept constant (PA6/P…
The transport of granular material often generates severe damage. Understanding the correlation between the friction coefficient, particle geometry and wear mechanisms is of primary importance for materials undergoing abrasive wear. The aim of this study is to investigate the effect of particle geometry on wear mechan…
Multiwalled carbon nanotubes (MWNTs) are chemically modified with respect to various different oxidative conditions, including the acid concentration, treatment time, and temperature. The conductivity of polyurethane (PU) composites filled with the MWNTs oxidized under optimal condition is measured as a function of fr…
We describe a unique silk protein secreted from the cylindrical silk glands of the spider Nephila clavata. This silk is primarily composed of three proteins, whose transcripts of approximately 16.0, 14.5 and 13.0 kb are homologous to one another in two termini and repetitive units, as determined on Northern blotting.…
O uso de fibras naturais como reforçadores para termoplásticos tem despertado interesse crescente, principalmente para termoplásticos reciclados, devido ao baixo custo, utilização de recursos naturais brasileiros disponíveis, além de contribuir para a despoluição ambiental. No presente trabalho foram avaliadas as prop…