Materials Literature
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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…
The present paper presents a review of theoretical aspects of deposition of chromium from trivalent chromium electrolytes and a corrosion rate study of the initial rate of corrosion of chromium deposits from these electrolytes on nickel deposits. A higher rate of corrosion was obtained from chromium deposits plated fr…
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The binary mixtures of Di-heptyloxyazoxybenzene (HOAB) and Cholesteryl Benzoate (ChB) show the longest ever temperature range of TGBA and TGBC* phases for ChB concentration 25 and 18 mole percent respectively. Comprehensive dielectric studies of these two binary mixtures have been carried out in the frequency range of…
Crystals of lanthanide ethylenediamine diphos phates Ln 2 (NH 2 (CH 2 ) 2 NH 2 )(HP 2 O 7 ) 2 · 4 H 2 O ( Ln = Eu (1) , Tb (2) , Er (2) ) have been synthesized and investigated by single crystal X-ray diffractometry (Eu and Tb phases) and by powder X-ray diffractometry (Er phase). The three structures resulted to be i…
In this work, we investigate the effects of disorder in the doped carbon nanotubes. Based on the extended Su-Schrieffer-Heeger model, it is shown that with the increase of doped impurity atoms, such as nitrogen or boron, the symmetry of the hopping processes among the doped and carbon lattices collapses, and the stati…
Photoresist stripping processes based on hydrogen reductive chemistry have emerged as attractive replacements of the conventional treatments performed using O2 plasma. H2 discharges and plasma processes based on gas mixtures containing H2 provide, in fact, adequate stripping rates while reducing the chemical modificat…
DSC method has been used to establish a solid state polymorphism of four dimethyl butanols having CH3 side groups: 2,2-dimethyl-1-butanol [CH3CH2C(CH3)2CH2OH)], 3,3-dimethyl-1-butanol [(CH3)3CCH2CH2OH], 3,3-dimethyl-2-butanol [(CH3)3CCH(OH)CH3] and 2,3-dimethyl-2-butanol [(CH3)2CHCOH(CH3)2]. Three isomers appear to be…
(111)-oriented Zn 3 N 2 thin films were grown on a -plane (1120) sapphire substrates by plasma-assisted molecular beam epitaxy. Zn 3 N 2 /sapphire exhibits orientational relationships of out-of-plane <111>∥[1120] and in-plane almost <110>∥[0001] and <101>∥[0001]. These specific orientations result from similar surface…
The cause underlying the onset of stenosis after vascular reconstruction is not well understood. In the present study, we evaluated the effect of mechanical unloading on the differentiation state of human vascular smooth muscle cells (hVSMCs) using a tissue-engineered vascular media (TEVM). hVSMCs cultured in a mechan…