Materials Literature
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Differential scanning calorimetry (DSC) and X-ray diffraction analysis were performed to study the multiple melting behavior and crystal forms of neat syndiotactic polystyrene (s-PS) in comparison with its miscible blends with amorphous atactic polystyrene (a-PS) or poly(2,6-dimethyl-p-phenylene oxide) (PPO). For neat…
Grain boundaries in model ZnO-Bi2O3 and ZnO-Bi2O3-CoO varistors and a commercial multicomponent varistor have been characterized by high-resolution electron microscopy (HREM) and scanning transmission electron microscopy (STEM), in order to determine the relationship between Bi grain boundary segregation and formation…
New liquid crystals consisting of non-chiral, banana shaped molecules are investigated by the generation of the second harmonic (SHG) of an optical wave. The temperature and electric field dependence of the SH activity of the apparent thermodynamic phases of several homologues are studied and first quantitative values…
We present large-scale molecular dynamic simulations of microcrack growth in -iron based on an N -body potential model which gives a good description of defect energetics, anisotropic elasticity and phonon frequency spectra. We demonstrate dynamic overshoot of a pre-existing microcrack under impact loading. We show th…
We study a series of the perovskite manganite compounds ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ closely spaced in doping near $x=0.50$ where the ground state undergoes a doping-dependent metal-insulator transition (MIT) from a metallic to a charge-ordered state. A significant difference i…
Thick films were prepared on glass substrates coated with indium tin oxide (ITO) via electrophoretic deposition using sols that contained phenylsilsesquioxane (PhSiO 3/2 ) particles derived from phenyltriethoxysilane. The transparency of the thick PhSiO 3/2 films was significantly improved via heat treatment at temper…
Molecular dynamics (MD) simulations have been used to investigate the effects of electron-phonon coupling on defect production and clustering produced in the primary cascade state of neutron radiation damage in -Fe. A simplified physical model of electron-phonon coupling has been incorporated with the hybrid continuum…
Ultrathin films of NiO grown on Ag(100) were investigated by photoemission microscopy. To image antiferromagnetic domains, linearly polarized light from an insertion device was used. The micrographs revealed lateral changes of the spectral line shapes of the 3p photoemission spectrum which were confirmed by taking ful…
Iron(III) tetrasulfophthalocyanine (FePcS) was shown to catalyze the oxidation of polycyclic aromatic hydrocarbons by H2O2. Benzo[a]pyrene and anthracene were converted to the corresponding quinones while biphenyl-2,2′-dicarboxylic acid was the main product of phenanthrene oxidation. The mechanism of the anthracene ox…
Atomic force microscopy (AFM) has been used to visualize events arising from the formation of intervening metastable phases at the surfaces of macromolecular crystals growing from solution. Crystals investigated were of the proteins canavalin, thaumatin, lipase, xylanase, and catalase, crystals of transfer RNA, and cr…
Synchrotron-based photoemission spectroscopy (PES), low energy electron diffraction, X-ray reflectivity, and optical and atomic force microscopy were used to study the reaction of water vapor [at pressures p(H2O)≤2.0×10−5 Torr for 3 min] with UHV cleaved MgO(100) surfaces with different levels of surface defects. The…
Poly(acrylic acid) (PAA) was the focus of an investigation in the role and behavior of polyelectrolyte dispersants in aqueous‐based colloidal processing of silicon nitride. The steady‐shear flow properties of dense suspensions were examined as a function of pH, particle volume fraction, chain length, and polymer conce…
Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The step-selective incorporation pattern for boron anions is opposite to that observed for the tetrahedra…
In order to establish a simple model of protein interparticle interaction near crystallization conditions, we have measured the osmotic compressibility of the metastable fluid phase of hen egg-white lysozyme within the fluid-solid coexistence region. Light scattering measurements were performed in an extended volume f…
Muconate lactonizing enzyme (MLE), a component of the beta-ketoadipate pathway of Pseudomonas putida, is a member of a family of related enzymes (the "enolase superfamily") that catalyze the abstraction of the alpha-proton of a carboxylic acid in the context of different overall reactions. New untwinned crystal forms…
The present paper is a study of the ferroelectric and antiferroelectric behaviour in low molar mass organosiloxane liquid crystal materials classed as mono-mesogens (AB type) and bi-mesogens (ABA type). A systematic study of series of materials all based on the same chiral mesogenic moiety is presented. The mesogen is…
The N-terminal 15 amino acids of the major protein associated with inorganic pyrophosphatase activity in Bacillus subtilis WB600 are identical to those of B. subtilis ORF yybQ. This ORF was amplified from B. subtilis WB600 DNA by PCR and cloned into an overexpression vector in Escherichia coli. Induction of overexpres…
We propose a flow method to produce barium hexaferrite (BaO6Fe 2 O 3 ) particles with hydrothermal crystallization in supercritical water. Aqueous iron(III) and barium nitrate solution at room temperature was pressurized to 30 MPa and then mixed with potassium hydroxide solution (OH:NO 3 = 4) at the same conditions to…
The effect of hydrostatic pressure on the lower critical ordering transition (LCOT) was investigated by in situ small angle neutron scattering on symmetric and asymmetric diblock copolymers of perdeuterated polystyrene and poly( n -butyl methacrylate). These systems exhibit a transition from the disordered to ordered…
We have compared the X-ray structures of 13 thermophilic proteins with their mesophilic homologues, in order to bring out differences in the stability of helices. The energy terms of a helix-coil transition algorithm were used to evaluate helix stability. Helices of thermophilic proteins are more stable than the mesop…