Materials Literature
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The influences of surface roughness on the boundary conditions for a simple fluid flowing over hydrophobic and hydrophilic surfaces are investigated by molecular dynamics (MD) simulation. The degree of slip is found to decrease with surface roughness for both the hydrophobic and hydrophilic surfaces. The flow rates me…
Abstract Acrylonitrile butadiene rubber (NBR)/poly(vinyl chloride) (PVC) alloy, filled with anhydrous copper sulfate (CuSO 4 ) particles, was investigated for the first time. The material could be crosslinked in the existence of CuSO 4 by heat pressing, without any other crosslink agents. The crosslinking in the mater…
Abstract The addition of inorganic filler into commodity plastics has a long history. Today, polymer composites based on nanosized filler are popular among polymer scientists from academia and industries due to their ability to enhance a number of physical properties. In this work, we investigate the dispersion and re…
A high-contrast, fast-response, and polarizer-free reflective display using a dye-doped dual-frequency liquid crystal gel is demonstrated. The high contrast ratio originates from the combination of light scattering from the microdomain polymer gel and absorption from the black dyes. The fast response is due to the fre…
A metal-dimer assembled system, M(2)(dtp)(4) (M = Ni, Pd; dtp = dithiopropionate, C(2)H(5)CS(2-)), was synthesized and analyzed by the X-ray single-crystal diffraction method, UV-vis-near-IR spectra of solutions, solid-state diffuse reflectance spectroscopies, and electrical conductivity measurements. The structures e…
Orientation imaging microscopy has been used to investigate the effects of Nb doping on the grain boundary plane distributions in TiO 2 (rutile). By comparing the grain boundary plane distribution of the undoped material with theoretical estimates of grain boundary energy anisotropy of pure rutile, it is possible to s…
Accurate assessment of cable insulation conditions can be achieved by implementing advanced diagnostic and simulation techniques that assist the measurement and monitoring of the properties related to aging and failure of the insulation system. It is well recognized that the electric field distribution is the dominant…
Abstract A new method to characterise the coefficient of friction of textile fabrics is proposed. The principle is based on the dry clutch, where an annular shaped flat upper body that is kept still, rubs against a lower flat surface, which rotates around a vertical axis at a constant angular velocity. Friction coeffi…
A new group of ABO 3 -type lead-free piezoelectric ceramics, [Bi 0.5 (Na 1- x Ag x ) 0.5 ] 1- y Ba y TiO 3 , was developed, and the corresponding invention patent was submitted. The ceramics were synthesized by the conventional ceramic sintering technique using electronic grade raw materials, and the preparation techn…
A novel 1,2-dithiolate ligand, that is, the 2-(trifluoromethyl)acrylonitrile-1,2-dithiolate, abbreviated here as tfadt, is prepared from the corresponding cyclic dithiocarbonate. This ligand, substituted with both a CN and a CF(3) group, is compared with the well-known maleonitrile- and bis(trifluoromethyl)ethane-1,2-…
A low-power wavelength dispersive x-ray fluorescence (WDXRF) system with a spatial resolution of 25μm has been built to measure thin-film thickness. By using advanced x-ray optics and a 50-W air-cooled x-ray tube, the system achieved a detection limit equivalent to that of a conventional WDXRF system that employs a 4-…
This review presents the results concerning a comparatively new trend in physics of plasma electrolysis, surface-treatment technology, deposition of coatings, and processes of plasma–electrolyte saturation. Physical and chemical principles of plasma electrolysis are discussed. As shown, this way of materials treatment…
Concerning important infrastructures and civil structures, they need real time detection during the service, such as high-rise buildings, cables, bridges and dams. Therefore, it is necessary to study sensing property of shape memory alloy (SMA) for developing a sensing element embedded in the structures to carry out d…
Two oximecyclophosphazenes were prepared from the hexakis(4-formylphenoxy)cyclotriphosphazene (2) and hexakis(4-acetylphenoxy)cyclotriphosphazene (8). The reactions of these oximes with ethyl bromide, allyl bromide, propanoyl chloride, and acriloyl chloride were studied. Hexasubstituted compounds were obtained from t…
Visando caracterizar e quantificar os minerais da fração argila e avaliar a contaminação por chumbo (Pb) ocasionada por efluentes de uma empresa recicladora de sucatas de baterias no município de Paula Freitas, PR, coletaram-se amostras de solo de várzea em cinco perfis. Além dos teores totais, as amostras de solo for…
A new fabrication method to improve the optical extraction efficiency of light-emitting devices is presented. The morphology of a self-assembled block copolymer was transferred to the surface of a compound semiconductor to achieve a subwavelength columnar structure. The optical extraction efficiency of the substrates…
In the course of our research on normal alkanols, the crystal structure of 1-pentanol has been solved by applying Patterson-search methods to laboratory powder X-ray diffraction data recorded on a curved position-sensitive detector (CPS120) at 183 K. The crystal structure was refined with the rigid-body Rietveld least…
O método proposto para análise mineralógica racional de argilominerais faz uso dos resultados fornecidos pelas análises por difração de raios X (DRX) e fluorescência de raios X (FRX), além de introduzir uma correção no teor de quartzo presente na amostra por meio da curva de quartzo livre levantada para cada tipo de a…
We study the effective interactions among large hard spherical colloidal particles induced by small hard rodlike particles and compare them with those induced by small hard spherical particles to highlight the specific effects due to the anisotropic shape of the former. This is done by determining the effective pair p…
In this paper, we report a controlled architectural growth of ultrathin films of conducting polymers via layer-by-layer (L-b-L) self-assembly with poly(3, 4-ethylenedioxythiophene), poly(styrenesulfonate) (PEDOT-PSS), and polypyrrole (PPy) as alternating layers. A typical step of the film growth was 2.3/spl plusmn/0.1…