Molecular Spectra of Sulfur Molecules and Solid Sulfur Allotropes
Abstract For Abstract see ChemInform Abstract in Full Text.
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Second-order optical nonlinearity and change in refractive index in silica glasses by a combination of thermal poling and x-ray irradiation
Second-order optical nonlinearity was found to be generated in high-purity silica glasses when they were exposed to x-ray radiation and then thermally poled. Two kinds of second-order optical nonlinearity, near-surface nonlinearity localized in a thin layer near the sample surface and bulk nonlinearity spreading throu…
Diagnostic and analytical study on a low-pressure limit of diamond chemical vapor deposition in inductively coupled CO–CH4–H2 plasmas
The role of neutral radicals and charged ions in a low-pressure limit of plasma-enhanced chemical vapor deposition of diamond has been studied by plasma diagnostics and a kinetic rate analysis for radicals. The fluxes of atomic hydrogen (H), methyl radicals (CH3), and ionic species were determined by optical absorptio…
Lattice thermal conductivity of K2(Bi1−zSbz)8Se13 solid solutions
The family of solid solutions of the type β-K2(Bi1−zSbz)8Se13 (0<z⩽1) was studied with respect to thermal conductivity as a function of temperature and stoichiometry. At low temperature, the variation of lattice thermal conductivity with composition shows a transition from a typical crystalline to glasslike beh…
Comparisons of polarization switching in “hard,” “soft,” and relaxor ferroelectrics
The dynamics of polarization switching have been investigated over extremely broad time (10−8<t<102 s) and field ranges for hard, soft, and relaxor ferroelectrics based on aliovalent modified Pb(Zr1−xTix)O3. The results unambiguously demonstrate important differences in the polarization switching mechani…
Magnetic phase transitions inPr5Ge4
The magnetic structure and magnetic phase transitions of the ${\mathrm{Pr}}_{5}{\mathrm{Ge}}_{4}$ compound are investigated by means of neutron powder diffraction (NPD) and small-angle neutron scattering (SANS). Both NPD and SANS indicate the existence of two magnetic phase transitions at 25 K and 42 K. Refinement of…
Synthesis and characteristics of biodegradable copolyesters from the transesterification of poly(butylene adipate‐co‐succinate) and poly(ethylene terephthalate)
Abstract Poly(butylene adipate‐ co ‐succinate) (PBAS), an aliphatic polyester, is known for its excellent biodegradability, but its physical and mechanical properties are poor. To improve the physical properties, stiff aromatic rings were added to PBAS through transesterification with poly(ethylene terephthalate) (PET…
Tyrosine phenol‐lyase and tryptophan indole‐lyase encapsulated in wet nanoporous silica gels: Selective stabilization of tertiary conformations
The pyridoxal 5'-phosphate-dependent enzymes tyrosine phenol-lyase and tryptophan indole-lyase were encapsulated in wet nanoporous silica gels, a powerful method to selectively stabilize tertiary and quaternary protein conformations and to develop bioreactors and biosensors. A comparison of the enzyme reactivity in si…
Continuum model for nanocolumn growth during oblique angle deposition
A continuum equation for the shadowing growth of individual nanostructures by oblique angle deposition is proposed and numerically integrated. The radius R of rotationally symmetric columns is calculated as a function of height z. Before the radius R saturates at its final value Rsat, column shapes obey the power law…
Structure and electrical properties of CdIn2O4 thin films sputtered at elevated substrate temperatures
A Hall mobility as high as 39.4 cm2 V−1 s−1 was obtained for cadmium indate (CdIn2O4) thin films deposited by rf reactive sputtering from a Cd–In alloy target. The structural and electrical properties for both as-sputtered and after-annealed thin films were studied as a function of the substrate temperatures. The resu…
Synthesis and properties of fluorinated polyimides based on 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)‐2,5‐di‐tert‐butylbenzene and various aromatic dianhydrides
Abstract A novel fluorinated diamine monomer, 1,4‐bis(4‐amino‐2‐trifluoromethylphenoxy)‐2,5‐di‐ tert ‐butylbenzene ( 2 ), was prepared through the nucleophilic substitution reaction of 2‐chloro‐5‐nitrobenzotrifluoride and 2,5‐di‐ tert ‐butylhydroquinone in the presence of potassium carbonate, followed by catalytic red…
Effect of doping SiO2 on high-frequency magnetic properties for W-type barium ferrite
The microstructure, static and dynamic magnetic and dielectric properties of BaCo1.3Zn0.7Fe16O27 doped with small amounts of SiO2 have been investigated. The results show that the crystal structure and static magnetic properties have no obvious changes as SiO2 varies from 0 to 1 wt %. However, the complex permittivity…
Continuous Charge Modulated Diagonal Phase in Manganites
We present a novel ground state that explains the continuous charge modulated diagonal order recently observed in manganese oxides, at hole concentrations x larger than one-half. In this diagonal phase the charge is modulated with a predominant Fourier component inversely proportional to 1-x. Magnetically this state c…
Electrochemical Properties of Lanthanum Hexacyanoferrate Particles Immobilized onto Electrode Surface by Au‐Codeposition Method
Abstract Lanthanum hexacyanoferrate (LaHCF) was immobilized onto a substrate surface as an electroactive material by Au‐codeposition method. The LaHCF particles were attached to the electrode surface as the result of occlusion within the gold film deposited. This deposition method was first introduced for the preparat…
Synthesis of One Monolayer of Hexagonal Boron Nitride on Ni(111) from B‐Trichloroborazine (ClBNH)3.
Abstract For Abstract see ChemInform Abstract in Full Text.
Effect of 2‐mercaptobenzothiazole level on kinetics of natural rubber vulcanization
Abstract The kinetics of natural rubber vulcanization were investigated by use of a vulcameter. The vulcanization process before t dis (the time when the accelerators and/or intermediates react to depletion) was expressed in an equation as ln( M H − M t ) = ln A − k 1 ( t − t 0 ) α , which is different from the famous…
Quantitative optical sensing in two-component mixtures using porous silicon microcavities
In this work, we report encouraging results on all-optical quantitative determinations in binary mixtures of chemical substances using porous silicon technology. Measuring the resonance peak shifts of porous silicon microcavities, after exposure to vapors of several liquid mixtures (iso-propanol/ethanol, iso-propanol/…
Monte Carlo simulation on dielectric and ferroelectric behaviors of relaxor ferroelectrics
The dielectric and ferroelectric behaviors of relaxor ferroelectrics over the ferroelectric transition range are simulated using Monte Carlo simulation. The simulation is based on the Ginzburg–Landau ferroelectric model lattice in which a random distribution of two types of defects (dopants) which will suppress and en…
Solvation Effect of Li+ on the Voltammetric Properties of [PMo12O40]3−. Part 2: Comparative Studies on the Preferential Solvation in Acetonitrile+S and Acetone+S Mixtures
Abstract For [PMo 12 O 40 ] 3− , the presence of Li + produced a two‐electron wave at nearly the same potential as the first one‐electron wave in acetonitrile or acetone. The voltammetric behavior of [PMo 12 O 40 ] 3− in a binary mixture of acetonitrile and solvent S was compared with those in a mixture of acetone and…
Aqueous Sulfur Sols
Abstract For Abstract see ChemInform Abstract in Full Text.