Materials Literature
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The structure, phase composition, morphology, and electrical conductivity of Ni-Cu alloy ultrathin films having a thickness of d = 1−10 nm and a Cu concentration of 10–95 at % have been studied. All films are shown to be fcc Ni-Cu alloys; they have an island structure with an island size of 1.5–2 nm in the as-deposite…
Four new de Vries I-A-C* ferroelectric liquid crystal mixtures have been formulated to have high tilt (45°), high polarization, and low smectic layer shrinkage for use in analog electro-optic phase modulators. The mixtures are based on a high-tilt anti-ferroelectric compound which, when combined with other compounds,…
The synthesis, X-ray crystal structure, and magnetic studies of a rare example of organic/inorganic spin hybrid clusters extended in infinite ladder-type chain [Cu(C5F6HO2)2]7(C35H35N5O4)2 ([Cu(hfac)2]7(pyacbisNN)2, 2) formed by the reaction of a high spin nitronylnitroxide biradical C35H35N5O4 (pyacbisNN, 1) and bis(…
Abstract The influence of heat treatment on the performance of various polymers as iron oxide dispersants in an aqueous system has been investigated. The polymers evaluated include: homo-polymers of acrylic acid, methacrylic acid, maleic acid; co-polymer of, acrylic acid:2-acrylamido-2-methylpropane sulfonic acid; ter…
We review our main experimental and theoretical results on the optical emission properties of Si-nanocrystals (Si-nc's) fabricated by colloidal and thin film deposition techniques, showing that the surface chemistry of the Si-nc's or the surrounding matrix play a crucial role in determining both the structural stabili…
The reactive ion etching characteristics of ZnO have been investigated as functions of CH 4 /H 2 gas composition, total gas pressure, and radio frequency (rf) plasma power. It was found that the etching rate of ZnO strongly depends on gas composition and gas pressure, suggesting that the etching of ZnO largely involve…
The synthesis, phase transition parameters, the temperature dependence of spontaneous polarization, tilt and pitch of (S)-(+)-4-(1-methylheptyloxycarbonyl)phenyl 4′-(cyanoacetoxy hexoxy)biphenyl-4-carboxylates and (S)-(+)-4-(1-methylheptyloxycarbonyl)biphenylyl 4′-(cyanoacetoxy)benzoate are described. These compounds…
It was revealed that the ML 2 complexes (L - is the anion of 3,3′,5,5′-tetramethyl-4,4′-dibutyldipyrrolylmethene; M = Cu 2+ , Zn 2+ ) are coordinatively unsaturated and, therefore, are able to coordinate electrondonor molecular ligands (pyridine and dimethylformamide (DMFA)) with the formation of ML 2 (Solv) 2 solvate…
A single-stage procedure was developed for preparing carboxylated microcrystalline cellulose from native cellulose in 45–55% nitric acid acting as a deposited form of catalyst of cellulose oxidation, nitrogen(IV) oxide, and as a selective reagent partially hydrolyzing cellulose.
Microcrystalline boron-doped diamond powders consisting of octahedrally faceted crystals have been synthesized in the C-H-B system at a pressure of 8 GPa and temperatures above 2000 K. The presence of boron has been shown to reduce the parameters of diamond synthesis compared to the binary system C-H (naphthalene). On…
Abstract The densities of liquid copper, cobalt, and iron, their binary and ternary alloys have been measured over a temperature range including the undercooled regime. A non-contact technique was used, consisting of electromagnetic levitation combined with optical dilatometry. For all samples, the density was a linea…
Lead zirconate titanate (PZT) is a piezoelectric material that can sense or respond to mechanical deformations and can be used in ceramic electro‐mechanical systems (C‐MEMS). The microstructural, electrical, and piezoelectric characteristics of thick PZT films on low‐temperature cofired ceramics (LTCC) and alumina sub…
In our previous studies using the two-term impactor-shield localized interaction model, we derived the rule determining the order of the plates with different mechanical properties in a multilayer shield that yields a maximum ballistic limit velocity against conical impactors.In the present study we show that this rul…
First-principles pseudopotential calculations have been performed to investigate intrinsic defects including vacancies, interstitials, antisite defects, as well as Schottky and Frenkel defects in $\mathrm{PbFCl}$ crystals. For the isolated vacancies and interstitials, their formation energies are critically dependent…
Magnetic susceptibility of solid solutions of bismuth orthoniobates of low-and high-temperature modifications containing chromium was studied. Parameters of exchange interactions in the dimeric clusters of nickel atoms and also the distribution of monomers and dimers in the solid solutions were calculated. The crystal…
Results of numerical calculations based on the Rose-Fowler-Vaisberg model of radiation-induced conductivity in a case polymer upon long (10 4 s) irradiation at doses of 5 × 10 5 –10 7 Gy are reported. Two irradiation modes were considered: (1) preliminary irradiation and irradiation repeated at variable times after th…
Silica-coated gold (Au) nanoparticles were prepared and their morphological and X-ray absorption properties were investigated. These core–shell type nanoparticles are very stable in aqueous media and may be suitable for an X-ray contrast agent in biological systems. Transmission electron micrographs confirmed well-sep…
Accurate measurement of linewidth is a critical problem in sub-100nm semiconductor manufacturing, where required accuracy is below 1nm. Critical dimension scanning electron microscopes (CD-SEMs) are usually used for such measurements. A cross correlation of CD-SEMs, while demonstrating a good relative trend, is often…
Porous silicon one-dimensional (1-D) photonic crystal microcavities are fabricated as building blocks for optical modulators. The microcavities consist of porous silicon layers with alternating low and high porosity. Since the pore size is much smaller than the incident wavelength of light, each porous silicon layer i…
During a survey of non-marine diatoms from the Marion Island, three new species, Pinnularia thoenii Van de Vijver sp. nov., Gomphonema marionense sp. nov. and Frustulia lebouvieri sp. nov. were recorded. The detailed morphologies of these three species are examined using both light (LM) and scanning electron (SEM) mic…