Materials Literature
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The temperature T and magnetic-field H dependences of anisotropic in-plane ${\ensuremath{\rho}}_{\mathrm{ab}}$ and out-of-plane ${\ensuremath{\rho}}_{c}$ resistivities are investigated in single crystals of the bilayer manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}.$ Below the Curie…
We suggest a workable approach for the description of multiscale magnetization reversal phenomena in nanoscale magnets and apply it to CoPt-type alloys. We show that their hysteretic properties are governed by two effects originating at different length scales: a peculiar splitting of domain walls and their strong pin…
Structural compliance is the ability of a crystal structure to accommodate variations in local atomic bond-lengths without incurring large strain energies. We show that the structural compliance of cuprates is relatively small, so that short, highly doped, Cu-O-Cu bonds in stripes are subject to a tensile misfit strai…
We report a new technique of scanning capacitance microscopy at microwave frequencies. A near field scanning microwave microscope probe is kept at a constant height of about 1nm above the samplewith the help of Scanning Tunneling Microscope (STM) feedback. The microwaves are incident onto the sample through a coaxial…
The definiteness of bulk electrostatic potentials in solids under periodic boundary conditions defined in an invariant manner has been proved in the general case of triclinic symmetry. Some principal consequences following from the universal potential correction arising are discussed briefly.
Just after formation, optical fibres are wetted stably with acrylate at capillary numbers routinely exceeding 1000. It is hypothesized that this is possible because of dissolution of air into the liquid coating. A lubrication/boundary integral analysis that includes gas diffusion and solubility is developed. It is app…
Adsorption characteristics of NO x were studied with granular activated carbon (GAC) impregnated with potassium hydroxide (KOH). To confirm the selective adsorptivity of KOH-impregnated activated carbon (K-IAC) to NO x in a fixed-bed adsorption column, temperature of 303–403K, linear velocity of 10–32 cm/sec, and effe…
The modulated structures of incommensurate composite crystals (La(0.912)S)(1.13)TaS(2) at room temperature and of (La(0.949)S)(1.14)NbS(2) at T = 115 K are refined against high-resolution X-ray data. The compounds are isostructural with superspace group F'm2m(alpha,0,0)00s. For (LaS)(1.13)TaS(2), lattice parameters of…
Abstract A series of AB x ‐type triarylphosphine oxide monomers, bis‐(4‐fluorophenyl)‐(4‐hydroxyphenyl)phosphine oxide ( 4a ), bis‐(3,4‐difluorophenyl)‐(4‐hydroxyphenyl)phosphine oxide ( 4b ), and 4‐hydroxyphenyl‐bis‐(3,4,5‐trifluorophenyl)phosphine oxide ( 4c ) were prepared, characterized, and polymerized under nucl…
Abstract This Letter demonstrates a unique negative lateral shift of a Gaussian beam transmitted through a slab with both negative permittivity and permeability, which is distinctly different from a shift caused by a regular dielectric slab. The incident beam is modeled as a tapered wave with a Gaussian spectrum. The…
In this letter, we compare the properties of bulk and epitaxial ZnO. The ZnO thin films were grown on GaN templates and on ZnO single crystals by vapor phase deposition using Zn and NO2 as precursors. We use high-resolution x-ray diffraction to resolve the structural properties. The rocking curves of the bulk crystal…
Evaluation of thermal efficiency is of great importance for verifying the design optimization of microbolometer-based sensors. In this work, a measurement technique has been developed to determine the thermal efficiency of a microbolometer without using structural and material parameters. The microbolometer thermal ef…
A simulated-annealing direct-space approach has been applied to predict the crystal structures of a series of metallo-organic complexes containing Zn, Cu and Ni. The prediction methodology generates a set of energetically reasonable crystal structures among which the actual structure is present, but it is not always p…
Measurements of the self-diffusion coefficients D and the oxygen-17 and deuterium spin–lattice relaxation times T1 in light and heavy water have been extended into the supercooled region to a maximum pressure of 400 MPa and to a minimum temperature of 240 K and partly to even lower temperatures. With these measurement…
Polyurethane (PU) elastomers from castor oil based polyol, polyethylene glycol (PEG) of various molecular weight (200, 400, and 600) and toluene diisocyanate were prepared in the form of transparent sheets. The sorption, mechanical and thermal properties have been studied. The solubility parameter, molecular weight be…
Abstract The synthesis of the new chromophores 2‐{4‐[4‐( N , N ‐dihydroxyethylamino)‐phenylazo]‐phenyl}‐6‐nitrobenzoxazole ( 1 ) and 4‐[4‐( N , N ‐dihydroxyethylamino)phenylazo]‐benzoic acid ( 2 ) is described. Three homopolymers obtained by the polycondensation of 1 with propyloxy‐terephthalic acid and 1 and 2 with 2…
The effects of woven structures on fluid flow through the basic weaves of multifilament woven filter cloths were studied numerically by using the fluid-flow software fluent™. From results of the numerical solution, the flow pattern and the resistance to flow in the interstices were obtained. Results of this work show…
New supramolecular A2B2 co-polymers formed in solution from a rigid diporphyrin monomer (the A2 unit) and a short flexible dipyridine monomer (the B2 unit) are reported; NMR experiments show that complete binding occurs at mM concentrations; UV titrations reveal that the dipyridine unit and a monomeric control ligand…
Core level photoemission spectra from a free-standing bundle of single-wall carbon nanotubes have been measured using a high-flux soft x-ray spectromicroscope. The good signal-to-noise ratio for the C 1s emission provides information on fundamental quantities such as the core-hole lifetime and binding energy, free fro…
We grow multiwall carbon nanotube (CNT) films using thermal chemical vapor deposition at atmospheric pressure using a mixture of acetylene and nitrogen from a 4-nm-thick Ni film catalyst. CNTs are characterized using electron microscopy and Rutherford backscattering spectrometry. CNTs grown with this method are extrem…