Materials Literature
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Au-particle/Al2O3-matrix nanocomposite thin films with a narrow Au particle size distribution were fabricated by radio-frequency magnetron cosputtering. The films were characterized both chemically and structurally using x-ray photoelectron spectroscopy, x-ray diffraction, and transmission electron microscopy. The opt…
Selected highlights in the recent development of microplasma devices are reviewed with emphasis on large arrays of Si-based hybrid plasma/semiconductor pixels. Arrays of 40 000 (200 x 200) pixels, excited by sinusoidal ac waveforms at frequencies of 5-20 kHz, have now been realized. The fabrication of these arrays and…
A new aluminum hydroxide cluster with eight Al(III) ions linked together by a series of hydroxyl bridges as a sulfate salt has been synthesized from aqueous solution and characterized by X-ray crystallography and 27Al NMR spectroscopy.
The fundamental properties of lithium amide $\mathrm{Li}\mathrm{N}{\mathrm{H}}_{2}$, which is fully hydrogenated phase of lithium nitride ${\mathrm{Li}}_{3}\mathrm{N}$, have been investigated by the first-principles calculations using the ultrasoft pseudopotential method, including the structural, electronic, dielectr…
Multi-walled carbon nanotubes (MCNTs) can be obtained by heating grass in the presence of a suitable amount of oxygen. Grass contains a large amount of vascular bundles in the stem and nervation. The major compositions of them are cellulose, hemicellulose and lignin. In the present approach, a rapid heat treatment (at…
Using bismuth(III) hexanoate (BiHex 3 ) as initiator and tetraethylene glycol as co-initiator, ε-caprolactone (εCL) and l -lactide (LLA) were copolymerized in bulk. Whereas monomer/initiator and monomer/co-initiator ratios were kept constant, the temperature was varied from 100 to 140 °C. Amorphous copolyesters having…
The bismuth borates Bi 2 ZnB 2 O 7 and CaBiGaB 2 O 7 have been synthesized by solid-state reactions at temperatures in the 650−825 °C range at 1 atm pressure. These compounds are the only synthetic diborate members of the melilite family, A 2 XZ 2 O 7, in which layers of A cations alternate with XZ 2 O 7 tetrahedral l…
Coevaporated bismuth-tellurium and antimony-tellurium films were fabricated under various deposition conditions (controlled evaporation rates of individual species, substrate temperature, and substrate material), and their thermoelectric (TE) properties (Seebeck coefficient, electrical resistivity, and carrier concent…
Poly(dimethylsiloxane) (PDMS) is a biomaterial that presents serious surface instability characterized by hydrophobicity recovery. Permanently hydrophilic PDMS surfaces were created using electrostatic self-assembly of polyethyleneimine and poly(acrylic acid) on top of a hydrolyzed poly(styrene-alt-maleic anhydride) b…
White hybrid organic/inorganic light-emitting devices (LEDs) have been fabricated by using stable red-emitting CdSe/ZnS core-shell quantum dots (QDs) covered with a trioctylphosphine oxide organic ligand. The device-active structure consists in a host/guest system with a blue-emitting poly[(9,9-dihexyloxyfluoren-2,7-d…
The chemical synthesis, isolation, and characterization of phenyl viologen (PV) as a dication, radical cation, and neutral species are described. Single-crystal X-ray diffraction of PV(2+)2Cl(-.)2H2O and PV(.+)PF(6)(-).pyridine reveals the expected differences in bond lengths and also a structural change from two copl…
Preface.PART ONE.1. Crystal and Electronic Structure of Meals.1.1 Introduction.1.2 Crystal Structures of the Metallic Elements.1.3 Exceptions to the Rule of the Metallic Bond.1.4 Effects of High Pressure on Crystal Structure.1.5 Effect of Electronic Structure on Crystal Structure.1.6 Periodic Trends in Material Proper…
The existence of a very special ratcheting regime has recently been reported in a granular packing subjected to cyclic loading \cite{alonso04}. In this state, the system accumulates a small permanent deformation after each cycle. After a short transient regime, the value of this permanent strain accumulation becomes i…
The interaction of Al2O3 and CeO2 thin films with sulfur dioxide (2.5 mbar) or with mixtures of SO2 with O2 (5 mbar) at various temperatures (30-400 degrees C) was studied by X-ray photoelectron spectroscopy (XPS). The analysis of temperature-induced transformations of S2p spectra allowed us to identify sulfite and su…
Series of amorphous SiO2, ZrO2 and HfO2 films were prepared by electron-beam evaporation at various oxygen pressures such that the packing density varied from 0.6 to 0.82. Transmittance spectra were evaluated with respect to thickness and refractive index by application of analytical formulas to the interference extre…
The electrical properties of CaCu 3 Ti 4 O 12 ceramic materials, showing an enormously large dielectric constant, were investigated. It was found that the grain boundary plays an important role in the giant dielectric behaviour of these ceramics. Measurement of the electrical current density ( J ) versus the electrica…
We have developed a theory of exciton-polariton band structure of resonant three-dimensional photonic crystals for arbitrary dielectric contrast and effective mass of the exciton that is excited in one of the compositional materials. The calculation has been carried out for a periodic array of spheres embedded in a di…
We report the low-temperature multi-frequency ESR studies of copper pyrimidine dinitrate, a spin-1/2 antiferromagnetic chain with alternating $g$-tensor and the Dzyaloshinskii-Moriya interaction, allowing us to test a new theoretical concept proposed recently by Oshikawa and Affleck [Phys. Rev. Lett. 82, 5136 (1999)].…
Magnetic nanoparticles can be used for a variety of biomedical applications. They can be used in the targeted delivery of therapeutic agents in vivo , in the hyperthermic treatment of cancers, in magnetic resonance (MR) imaging as contrast agents and in the biomagnetic separations of biomolecules. In this study, a cha…
We use the Surface Green Function Matching (SGFM) method and a tight-binding hamiltonian to calculate the (100)-surface electronic band structure and local density of states of the series of Cu-based A^{I}B^{III}C2^{VI} chalcopyrites . We find four surface states in the optical gap energy region of s-p character and t…