Materials Literature
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Polyaniline doped with R-(−)- or S-(+)-camphorsulfonic acid produces an inexpensive chiral substrate; the presence or absence of water can be used to invert the dopant-induced circular dichroism (CD) absorbance at 450 nm, shedding light on conflicting literature reports.
Shielding of magnetic fields at power frequencies has been investigated by computation and experiment. Different types of low-cost soft magnetic laminations (low-carbon steel, nonoriented Fe–Si, grain-oriented Fe–Si) and different shield geometries (plane, U-shaped and box-like) have been considered. The shielding fac…
Holographic grating originating from photothermal effects in guest-host liquid crystals was characterized using heat-conduction analysis and Fraunhofer’s diffraction theory. The refractive index distributions, which are caused by interference light illumination and photothermal optical nonlinearity, were determined by…
In this study, the physical and electrical properties as well as thermal stability of sputter-deposited titanium carbide films as diffusion barriers for Cu metallization were investigated for the first time. With thermal annealing in ambient for 30 min, the unpatterned Cu (2000 Å)/ (500 Å)/n-Si structure was found to…
Single crystals of barium bismuth titanate (BaBi 4 Ti 4 O 15 ) and BaBi 4 Ti 4 O 15 partially substituted with V 5+ and Ba 2+ for Ti 4+ and Bi 3+ sites, respectively, at 5 at.% (Ba 1.2 Bi 3.8 Ti 3.8 V 0.2 O 15 ), were grown using slow cooling. The incorporation of vanadium into the B-site of the layered pseudo-perovsk…
Inelastic neutron scattering was used to study the temperature (T) dependence of the lattice excitations in La0.7Ca0.3MnO3. An optical Jahn-Teller phonon exhibits continuous but anomalous damping with increasing temperature in the ferromagnetic-metallic phase and collapses above the Curie temperature Te (240 K). We at…
The effect of grain-boundary dislocation transformations on diffusion in nanocrystalline solids is discussed. A theoretical model describing the enhancement of diffusion processes associated with the climb of grain-boundary dislocations in nanocrystalline solids is developed.
Vascular grafts in animal models have been used extensively in the microsurgical laboratory, and the rat offers an excellent source of graft to meet these needs. In this study, we compiled a list of vessels that were previously identified in experimental literature for use as vascular grafts in the rat model. We then…
Poly(vinyl alcohol) (PVA), fully or partially hydrolyzed, was reacted with D,L-lactic acid and glycolic acid in different conditions to synthesize polymers with pendant lactate and glycolate groups. Various degrees of grafting were obtained. 1H- and 13C-NMR analysis as well as thermal and mechanical methods were used…
The crystal structure, surface morphology, compositional homogeneity and electrical properties of barium strontium titanate (BST) thin films are investigated. The films were deposited on bare silicon and platinum coated silicon substrates by spin coating process. The precursor solution with Ba/Sr ratio 70/30 was prepa…
"Foreword." Science and Technology of Advanced Materials, 2(1), p. 1
A new classification of algae based on five kingdoms of living organisms is presented up to the ordinal level, they are distributed it three kingdoms and include 19 phyla, 31 classes and 107 orders. The classification makes use of micromorphological, ultrastructural and phycochemical characteristics of algae. Typified…
Fine magnetite powders dispersed in polymer solution were encapsulated from an oil-in-water emulsion prepared by an emulsification process employing a porous glass membrane and subsequent evaporation of the solvent. Styrene-based copolymers were dissolved in a magnetic fluid, and then continuously pushed through the p…
The dipyrromethanecarbinol motif is a key component in rational routes to a wide variety of porphyrinic macrocycles. We have investigated the dipyrromethane-monocarbinol self-condensation and the dipyrromethane-dicarbinol + dipyrromethane condensation under four different acid-catalysis conditions and have characteriz…
The performance of electrochemical capacitors made of Sb (6 mol %)-doped xerogel electrodes and nonacidic aqueous electrolyte solutions, including 0.1-2 M KOH and has been studied as a function of the thermal history of the xerogel. With increasing calcination temperature, the capacitance per unit weight was found fir…
Single crystals of Ba9Rh8O24, grown from a molten potassium carbonate flux, crystallize in the spacegroup R3c with lattice parameters of a = 10.0899(4) and c = 41.462(2) A. Magnetic measurements on oriented single crystals reveal the existence of magnetic anisotropy.
An empirical extension, based on the Kirkwood–Fröhlich equation, of a molecular based second-order perturbation theory is proposed to calculate the relative permittivity of dipolar liquids and mixtures in terms of the molecular dipole moment, the refractive index, density and temperature. Using the resulting equation,…
The atomic positions of the silicon carbide (SiC) polytypes 6H and 4H differ slightly from an ideal tetrahedron. These small deviations can be investigated by X-ray diffraction of so-called 'quasiforbidden' reflections, which are very sensitive with respect to the extremely small variations in the structure. Neverthel…
The reaction of Al2Cl6 with an excess of Ph2Si(OH)2 in THF in the presence of pyridine yielded new anionic and cyclic aluminosiloxanes: the structure of the anionic complex is composed of separated pyridinium cations and aluminosiloxane anions with a tetrahedral arrangement around the Al atom, which is similar to that…
We report high pressure Raman studies on single wall carbon nanotube bundles under hydrostatic conditions using two different pressure transmitting media, alcohol mixture and pure water. The radial and tangential modes show a blue shift when SWNT bundle is immersed in the liquids at ambient pressures. The pressure dep…