Materials Literature
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In this Letter, we consider a neutral system of mobile positive and negative charges confined on the surface of curved films. This may be an appropriate model for: i) a highly charged membrane whose counterions are confined to a sheath near its surface; ii) a membrane composed of an equimolar mixture of anionic and ca…
The thermal stability of a series of cobalt and nickel molybdates (AMoO 4 · n H 2 O, α-AMoO 4, and β-AMoO 4; A = Co or Ni) was examined using synchrotron-based time-resolved X-ray powder diffraction (XRD). The results of X-ray absorption near-edge spectroscopy (XANES) indicate that the Co and Ni atoms are in octahedra…
The weighted density approximation, its implementation and its application to ferroelectric materials is discussed. Calculations are presented for several perovskite oxides and related materials. In general the weighted density approximation is found to be superior to either the local density or generalized gradient a…
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We have studied the size effect of the homologues of the α,ω-diphenylpolyenes series, with two, three and four double bonds, on the formation of nanotubes with γ-cyclodextrin. The data show that only the two longest polyenes facilitate the formation of tubular structures when mixed with the γ-cyclodextrin in the appro…
By using small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC) we studied the thermal structural transition of lysozyme in the temperature range from 20 to 85 °C at pH 1.2, 3.9, and 7.0. α-Lactalbumin was used as a control. We found that the onset temperature determined from the DSC thermogra…
Isotopic labeling of Bombyx mori silk fibroin was achieved biosynthetically using two approaches. First, labeled fibroin was achieved by feeding silk worms [ 13 C 1 ]Gly and [ 13 C 1 ]Ala along with an artificial diet. Second, in vitro production of [ 15 N]Gly and [ 15 N]Ala labeled B. mori silk fibroin was accomplish…
Excited states of free base chlorin (FBC), free base Bacteriochlorin (FBBC), pheophytin a (Pheo a ), and chlorophyll a (Chlo a ), which are derivatives of free base porphine (FBP), were calculated by the SAC (symmetry adapted cluster)/SAC−CI (configuration interaction) method. The results reproduced well the experimen…
4,4‘‘-Diamino-5‘-phenyl- or 4-alkoxyphenyl- m -terphenyl and 4,4‘‘-dicarboxy-5‘-phenyl- m -terphenyl were synthesized through pyrylium salts and used for the preparation of rigid-rod polyamides and polyimides. The polymers were characterized by inherent viscosity, elemental analysis, FT-IR, UV−vis, 1 H NMR, 13 C NMR,…
Novel optically active aromatic isocyanates, 3-(( S )-(α-methylbenzyl)carbamoyl)phenyl isocyanate (( S )-3MBCPI) ([α] 365 25 +63°) and 4-(( S )-(α-methylbenzyl)carbamoyl)phenyl isocyanate (( S )-4MBCPI) ([α] 365 25 +181°), were synthesized and homopolymerized or copolymerized with m -methoxyphenyl isocyanate ( m MeOPI…
By irradiation with linearly polarized light at 366 nm, alignment change was generated in polymer liquid crystals ( MACB-AB n, n = 3, 6, and 11) with different spacer lengths of the azobenzene units but the same enthalpic stability of the liquid-crystalline phase. Polarized IR spectra revealed that the polymer main ch…
We present a united atom force field for simulations of 1,4-polybutadiene based on ab initio quantum chemistry calculations on model molecules. The geometries and energies of conformers and rotational energy barriers in model alkenes and dienes have been determined from high-level quantum chemistry calculations. A rot…
Water soluble poly( p -phenylene) derivatives, poly[2,5-bis(3-sulfonatopropoxy)-1,4-phenylene- alt -1,4-phenylene] sodium salt (PPP−OPSO 3 ) and poly[2,5-bis(3-sulfonatopropoxy)-1,4-phenylene- alt -4,4‘-biphenylene] sodium salt (PPBP−OPSO 3 ), have been synthesized through a Suzuki coupling reaction of 1,4-dibromo-2,5…
Viscoelastic properties of reversible networks formed in solutions of associating polymers are considered theoretically in the Rouse−Zimm (unentangled) regime. It is shown that the dynamics is governed primarily by the network strand size and by the effective lifetime of reversible junctions. Both frequency and concen…
The optical activity of Er-doped silicon is related to the presence of defects which enhance the typical radiative transition at 0.8 eV but whose nature and properties are still largely unknown. We have investigated the deep levels present in Er-doped liquid phase epitaxy silicon to identify the traps possibly related…
We have characterized the gap states from photoinduced absorption and photoinduced ESR studies on one-dimensional (1D) halogen-bridged metal complexes with degenerate and nondegenerate charge-density wave (CDW) ground state. A comparison of excitation profiles of self-trapped exciton (STE) luminescence with those of t…
We have grown epitaxial strontium titanate films on lanthanum aluminate substrates at a range of oxygen pressures and substrate temperatures. The complex dielectric function was measured as a function of temperature and electric field bias using a microwave ring resonator and a flip-chip technique. The films having th…
Magnetostriction at room temperature under various conditions of compressive prestress and applied fields of TbyDy1−y(Fe1−xTx)2 (T=Al, Mn) twin-free single crystals was investigated. The substitution of Al or Mn for Fe lowers the magnetostriction under ordinary temperature and pressure, and decreases the saturation fi…
A simple two-step process is reported here to deposit diamond coatings on titanium alloys at temperatures equal to or lower than 600 °C. The first step allows us to increase the carbon nucleation rate and to deposit a sacrificial layer which contains more than about 25% sp2 carbon. Its thickness is selected both to li…
A Raman-scattering study performed on ( -BBO) at room temperature allows us to assign all the vibrational modes detected in the Raman spectra. The internal and external vibration modes are properly obtained by taking account of the light polarization, mode contamination and isotope effects. A correspondence between th…