Materials Literature
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To clarify different phase formations of diamond nanocrystals upon pulsed-laser-induced liquid-solid interfacial reaction (PLIIR), we preformed the first-principles investigation of the total energy of cubic and hexagonal diamond. Interestingly, by a comparison of the structure stabilities of cubic and hexagonal diamo…
In this paper we study the magnetocaloric effect in the Laves phase pseudobinary $\mathrm{Er}({\mathrm{Co}}_{1\ensuremath{-}c}{\mathrm{Ni}}_{c}{)}_{2}.$ We use a theoretical model, considering both the localized spins of rare-earth ions and the itinerant electrons of the transition elements. The two-body interactions…
We studied two bidimensional square gratings of square holes formed in photoresist layers deposited on silicon wafers, both by classical spectroscopic ellipsometry (1.5-4.5-eV spectral range) at a constant incidence angle (70.7 degrees) and by angle-resolved Mueller polarimetry at a constant wavelength (532 nm). The g…
The electronic band structure, metallization, structural phase transition and superconducting transition of silver chloride (AgCl) and silver bromide (AgBr) under pressure are studied using the TB-LMTO method. The ground state properties and bandgap values are compared with the experimental and previous theoretical re…
The correction of order $1/\ensuremath{\omega}$ to the high-energy total ${e}^{+}{e}^{\ensuremath{-}}$ photoproduction cross section in the electric field of a heavy atom is derived with the exact account of this field; $\ensuremath{\omega}$ is the photon energy. The consideration is based on the use of the quasiclass…
The following dimolybdenum complexes containing −OSi(O t Bu) 3, −O 2 P(O t Bu) 2, and −OB[OSi(O t Bu) 3 ] 2 ligands have been synthesized and structurally characterized: Mo 2 (NMe 2 ) 4 [OSi(O t Bu) 3 ] 2 ( 1 ), Mo 2 (O t Bu) 4 [OSi(O t Bu) 3 ] 2 ( 2 ), Mo 2 (NMe) 4 {OB[OSi(O t Bu) 3 ] 2 } 2 ( 3 ), Mo 2 (NMe 2 ) 2 [μ-…
We report magnetic and magneto-optical measurements of two ${\mathrm{Mn}}_{12}$ single-molecule magnet derivatives isolated in organic glasses. Field-dependent magnetic circular dichroism (MCD) intensity curves (hysteresis cycles) are found to be essentially identical to superconducting quantum interference device mag…
A computational methodology is presented that is designed to model, at a coarse-grained level, the mesoscale dynamics of fluids and potentially other forms of soft matter. Within a molecular dynamics simulation, "ghost" particles of a specific size, corresponding to the fundamental length-scale of coarse-graining, are…
Titanium dioxide (TiO 2 ) films were deposited by r.f. reactive magnetron sputtering using four different sputtering gases, Ne, Ar, Kr, or Xe at a total gas pressure of 1.0 or 3.0 Pa. In the case of 1.0 Pa, the content of rutile phase markedly decreased and anatase content increased with increasing atomic mass of the…
The distribution of neutral copper oxide clusters in the gas phase created by laser ablation is detected and characterized through time-of-flight mass spectroscopy (TOFMS). The neutral copper oxide clusters are ionized by two different approaches: Multiphoton absorption of 355 and 193 nm radiation; and single photon a…
We report a study of the effect of hydrostatic pressure up to 9 kbar on selected compounds of the Gd5(SixGe1−x)4 series (x = 0.8, 0.45, 0.1) by means of ac magnetic susceptibility, compressibility, and linear thermal expansion measurements. The pressure-induced increase of the transition temperatures at the second-ord…
Zirconium oxide clusters are generated in the gas phase by laser ablation of the metal into a flow of ca. 5% O2/95% He at 100 psig and supersonic expansion into a vacuum chamber. Mass spectra of neutral gas phase zirconium oxide clusters are obtained through photoionization at three different laser wavelengths: 118, 1…
This paper reviews some of the progress made on wellbore stability modeling during the last two decades. First we demonstrate the improvement made on mud-pressure predictions by moving from analytic elastic solutions to finite element elastoplastic modeling. We show this progress, presenting a finite element model bas…
The corrosion performance of sandblasted (SB) and smooth fine-drawn (FD) medical-use nitinol wires was compared with the performance of wires with black oxide (BO) formed in air during their manufacture. Potentiodynamic and ASTM F746 potentiostatic tests in a 0.9 % NaCl solution were conducted on wires in their as-rec…
Single-wall carbon nanotubes are severely restricted by the fact that they exist in bundles. In addition, their interaction with other materials is poorly understood. In this work a new spectroscopic method is described to measure the ratio of free polymer to nanotube-bound polymer in SWNT/polymer solutions. This rati…
We report an unusual shear-induced smectic phase of high-molecular-mass isotactic polypropylene at temperatures well above its melting point. The necessary stiffness in the polymer chain is provided by shear-induced coil-helix transitions. Coupling between the conformational ordering and the density generates the smec…
In orientationally disordered systems, the ENDOR (electron−nuclear double resonance) spectra of high-spin ions having weak crystal field interaction (cfi) contain nuclear transition lines (often overlapped) that belong to several different electron spin manifolds, and the transition lines for each manifold are distort…
We report on measurements of room-temperature electroluminescence from single silicon nanocrystals. The electrically driven emission reveals typical characteristics of single-nanocrystal luminescence: the peak wavelength variations, narrowing of spectral bands, a high degree of linear polarization, and intensity fluct…
Ring-opening polymerization (ROP) of l -lactide (LLA) was carried out in bulk and toluene solution, respectively, using sodium bis(2-methoxyethoxy)aluminum hydride (Red-Al) as the catalyst (initiator). Experimental results show that Red-Al possesses typical characteristics of a living polymerization initiator. Bulk po…
Self-assembled “supra-molecular” liquid-crystalline phases were investigated in one of a series of symmetrically tapered bisamides based on an amide core of 1,2-bis[3,4,5-tris(alkan-1-yloxy)benzamido]benzene and three alkyl tails on each side of the core. One of this series of bisamides having 14 carbon atoms in each…