Materials Literature
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We report a smectic liquid crystal in which a tilt of the molecular orientation away from the layer normal in the Smectic C phase of up to 24 occurs with minimal layer contraction. This characteristic, accompanied by an exceptionally large underlying negative thermal layer expansion coefficient, enables the formation…
Electronic structures and optical properties of ZnO, SnO 2 and In 2 O 3 are investigated by using a first-principles calculation method based on the density functional theory. The dielectric functions dominated by electron interband transitions are analyzed in terms of the calculated electronic band structures and cha…
Abstract A novel fibrous silica with a gnarled surface structure and an inner tube with bundle-replicated stripes was prepared by sol-gel polymerization of tetraethoxysilane using collagen fibers as a template.
Cyanide-bridged trinuclear complexes containing square-planar platinum at the center were synthesized and identified by structure determinations. Their chemical building blocks were cis - and trans -PtL 2 X 2, Cp(dppe)FeX, Cp(PPh 3 ) 2 RuX (with X = Hal or CN), Pt(CN) 4 2 -, and Fe(CN) 6 3 - . Several of the intermedi…
The atomic and electronic structures of kappa‐Al 2 O 3 are determined using theoretical first‐principles techniques based on density‐functional theory (DFT), plane waves, and pseudopotentials. The obtained structure is confirmed by analysis of powder X‐ray diffraction data. The structure is orthorhombic with oxygen io…
We studied the interfacial tension between coexisting colloid-rich and polymer-rich fluid phases in a phase-separated colloid−polymer mixture. First, the location of the fluid−fluid binodal and the tie lines between the coexisting phases were determined using a recently proposed method that only requires the volumes o…
By using extensive molecular dynamics simulations, we have determined the violation of the fluctuation-dissipation theorem in a Lennard-Jones liquid quenched to low temperatures. For this we have calculated X ( C ), the ratio between a one-particle time-correlation function C and the associated response function. Our…
The structure of the μ-Al 4 Mn phase, which is an approximant of icosahedral and decagonal quasicrystals, is interpreted as a modulated crystal structure. It basically comprises modulated layers, in which the ordering of atomic vacancies takes place in the close-packed layers. The modulation is considered to be due to…
Poly(4-vinylpyridine) bearing an osmium complex was alternately assembled with poly(acrylic acid) on a gold substrate via hydrogen bonding. UV-Vis spectra were used to monitor the assembling process. X-ray diffraction patterns and AFM images showed that the multilayer film is of high quality with low surface roughness…
RuO 2 films prepared by reactive sputtering were annealed in air and vacuum and the changes of their crystal structure, chemical binding state and resistivity were studied. In air, the RuO 2 films maintain a rutile structure below 800°C. Crystal grain growth was found above 600°C and the minimum resistivity of 46 µΩcm…
Thermal diffusivity measurements on three polymer melts were made using the Forced Rayleigh Light Scattering technique. The polymers, which were tested at room temperature where they are in the molten state, included a polydimethylsiloxane and two polyisobutylenes. The optical setup and procedures developed in this st…
Abstract Experiments on zeolitization were conducted on four synthetic monocationic glasses (Na, K, Ca, or Mg-rich glass) with Si/Al molar ratios of 2.67, similar in acidity to many volcanic glasses of partially zeolitized Italian tuffs. The products of the hydrothermal treatment at 100, 150, and 200°C of single glass…
The objectives of the present research are to understand better the degradation of crosslinked polyethylene tubing subjected to pressurised, hot chlorinated water in flow through systems (e.g. home plumbing) and to estimate its service lifetime. Crosslinked polyethylene tubing was subjected to pressure testing with fl…
Abstract The adsorption of the silane coupling agents N -(2-amino-ethyl)-3-aminopropyl- trimethoxysilane (Z-6020), N -(2-(vinylbenzyl-amino)-ethyl)-3-amino-propyl-trimethoxysilane (Z-6032) and 3-glycidoxy-propyl-trimethoxysilane (Z-6040) onto the surface of kaolinite has been studied using the solvents water and ethan…
Electronic charge transport in insulating polymers is briefly discussed, particularly the measurement of charge carrier mobility. The more frequently used techniques of space charge profile measurent in dielectrics are then described, and data for polyethylene published during the last 5-6 years are reviewed.
Recipes are given to assist in setting up rigid bodies for common molecules and coordination polyhedra, to define satellite groups, to perform rotations around arbitrary axes through the origin of the rigid body, and to refine intramolecular degrees of freedom under consideration of the special needs of powder diffrac…
Indium tin oxide thin films have been deposited on glass substrates using rf magnetron sputtering at different power densities (0.27–0.80 W/cm 2 ) and at different substrate temperatures (RT-250) °C. Film structure, crystallite size and orientation, optical absorption and bandgap have been studied to characterize the…
The anisotropy ratios (parallel to the c axis versus perpendicular to the c axis) for the electrical resistivity, Seebeck coefficient, and thermal conductivity of horizontal Bridgman-grown n-type (Bi2Te3)90 (Sb2Te3)5 (Sb2Se3)5 and p-type (Sb2Te3)72 (Bi2Te3)25 (Sb2Se3)3 were measured at 300 K. The orientation having th…
We have developed a new high sensitive magnetic method for non-destructive testing (NDT) of small ferrous inclusions in aircraft engine discs. The measuring method is based on a second order gradiometer using three thin film Superconducting Quantum Interferometer Devices (SQUIDs) as magnetic sensors. The high balance…
Abstract Recent research on fouling in desalination systems, cooling towers, ocean thermal energy conversion (OTEC) heat exchangers, salinity power plants (SPP), etc. where composite inorganic and biological fouling may be present is reviewed. Crystallization or precipitation fouling is the most studied type of foulin…