Materials Literature
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Losses in piezoelectrics are approached by considering a description of direct stress–charge displacement hysteresis. Shortcomings of the usual loss models (viscous and Rayleigh, taken separately) are briefly demonstrated. Then, a mixed model for piezoelectric losses superimposing viscous and Rayleigh types of descrip…
Well‐defined La 2 Sn 2 O 7 with a phase‐pure pyrochlore structure was produced by hydrothermal synthesis at temperatures as low as 200°C. Production of phase‐pure La 2 Sn 2 O 7 requires a pH above 10, and higher pH accelerates the crystallization process. The synthesis produced spherical particles of average particle…
The rate of very slow crack growth in glass is measured by inducing small, controllable changes in the direction of propagation of Hertzian cone cracks at known times. After completion of a growth sequence, the sample is sectioned to reveal the fracture surface. The stress intensity factor at each stage of crack growt…
In this investigation, X‐ray diffractometry and 13 C NMR spectroscopy were used to characterize the effect of pH on the formation of gel and its thermal decomposition by the Pechini process. It was found that the major effect of pH was to destroy the esterification between citric acid (CA) and ethylene glycol, which i…
Lattice Monte Carlo simulations are used to calculate equilibrium properties of surfactant-solvent-silica liquid-crystal systems under no-polymerization conditions. The formation of a high-surfactant high-silica concentration phase in equilibrium with a dilute phase is observed when the surfactant-silica interactions…
Whole unstimulated saliva from two donors was investigated both with respect to adsorption characteristics and SDS‐induced elutability. Salivary protein adsorption onto hydroxyapatite (HA) discs was studied by means of in situ ellipsometry in the concentration range 0.1–20% saliva. The adsorbed amounts on HA were foun…
Abstract Catalytic oxidation of tartronic acid (TA) in water over a BiPt/C catalyst generates ketomalonic acid (KM) which polymerizes via ketone‐carbonyl to form the corresponding polyether, poly(ketomalonate) (PKM), preventing the competitive formation of KM‐hydrate available as reagent. Formation of the polyether (I…
A study of the effect of solute/solvent interactions on static and dynamic molecular hyperpolarizabilities (β and γ) of series of prototypical π-conjugated donor−acceptor chromophores is presented. The solvent effect was included via a recently proposed discrete quantum-mechanical Langevin dipoles/Monte Carlo method.…
Treatment of the mono-meso-substituted iron(II) octaethylporphyrin complexes, (py)2Fe(II)(meso-NO2-OEP), (py)2Fe(II)(meso-CN-OEP), (py)2Fe(II)(meso-HC(O)-OEP), (py)2Fe(II)(meso-Cl-OEP), (py)2Fe(II)(meso-OMe-OEP), (py)2Fe(II)(meso-Ph-OEP), and (py)2Fe(II)(meso-n-Bu-OEP), with hydrogen peroxide in pyridine-d5 at -30 deg…
The sintering behavior and surface microstructure of PbNi 1/3 Nb 2/3 O 3 –PbTiO 3 –PbZrO 3 (PNiNb‐PT‐PZ) ceramics were investigated. The PNiNb‐PT‐PZ ceramics with the stoichiometric composition and the addition of excess lead oxide (PbO‐rich ceramics) were sintered by liquid‐phase sintering in accordance with the solu…
A nanocomposite of dodecanethiol-passivated gold clusters and a silica aerogel has been synthesized. The gold particles were efficiently absorbed in a silica wet gel and the particles were not flushed out during sc-CO2 drying. This can lead to a very simple and efficient way to the production of devices with high nonl…
Cold-working of metallic materials up to large strains is usually characterised by simultaneous substructure evolution on different length scales and accompanied by the formation of significant lattice rotations. A promising tool for the description of such microstructure development is the concept of partial disclina…
A partially methylated highly branched polysilazane Si4N4CH9 is the first single-source precursor for stoichiometric Si3N4/SiC. Thermolysis delivers amorphous Si4N4C and H2 as the only gaseous by-product. Upon stepwise heating to 1900 °C, Si4N4C gradually crystallizes in the order α-Si3N4, β-SiC, and finally β-Si3N4,…
A reversible change in the [001] surface structure of ${\mathrm{LaAlO}}_{3}$ has been studied using x-ray truncation rod analysis. Crystal truncation rod profiles in the $00L,$ $10L,$ and $20L$ directions have been recorded on [001]-oriented single crystals at both room temperature and approximately 670 K under UHV co…
The authors propose an approach to constructing three-dimensional tissue with capillaries using cellulose hollow fibers. Fibronectin (FN) was immobilized on hollow fibers to assure cell attachment. Bovine coronary artery smooth muscle cells (BCASMC) and L cells were seeded on FN-immobilized fibers and cultured for an…
ABSTRACT: Several proteins, lipids and waxes were tested as edible coatings on sweet corn. Only zein, a natural constituent of corn, gave a continuous adhesive and stable coating with satisfactory sensory properties. After 8 days at 10 °C, the population of L. monocytogenes was 10‐fold lower on coated sweet corn than…
Infrared and far infrared transmission spectra have been measured for the ferromagnetic Ga 1- x Mn x As ( x =0.034 and x =0.050) between 10 and 12000 cm -1 . A broad peak is observed around 1600 cm -1 , and this energy is close to the deep acceptor level of Mn impurity in GaAs. A finite featureless absorption, spreadi…
The role that alkyl chain packing density in a self-assembled monolayer (SAM) plays in the adsorption of protein to the SAM surface was investigated using in situ neutron reflectivity (NR) and total internal reflection fluorescence (TIRF) measurements of the adsorption behavior of human serum albumin (HSA) and human i…
A method is proposed for the local atomic distribution function analysis of amorphous materials. This method is based on local halo-electron diffraction intensity analysis with nano-sized electron probes as small as 25 to approximately 3 nm, taking advantage of the intensity recording with imaging plate. Nanodiffracti…
Abstract Clay-Polyacrylate hybrid material was prepared from Montmorillonite (M) clay and polytrimethylol propane triacrylate (PA) using intercalation polymerization process. Characterization of the composite was done by x-ray diffraction (XRD), infrared (IR) spectroscopy, scanning electron microscopy (SEM) and energy…