Materials Literature
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Anion diffusion was simulated in the system (Y0.2Zr0.8)–(O1.72N0.15) with the molecular dynamics (MD) technique using the program DL_POLY, employing empirical potentials of the Buckingham type. To describe nitrogen migration, nitrogen potentials had to be developed, assuming the interaction of charged nitrogen shells…
Strontium titanate is an incipient ferroelectric where the freezing of the soft polar mode is inhibited by quantum fluctuations (Müller K. A. and Burhard H., Phys. Rev. B , 19 (1979) 3593). Exchanging 16 O by its isotope 18 O induces ferroelectricity at T c = 25 K (Itoh M., Wang R., Inaguma Y., Yamaguchi T., Shan Y. J…
Abstract Summary: One of the important applications of PUEs is as damping materials such as the spring aids used in cars, which need to have excellent cyclic fatigue durability. Our results show that the fatigue durability of PUE can be significantly improved by incorporating organoclay. The best result was obtained f…
Abstract Summary: So‐called functionally gradient materials have received increased attention as a new type of composite whose microelements, including composition and structure, change spatially to optimize the gradient properties for a specific application. In this study, a new technique for continuously preparing a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTElectrospinning in Near-Critical CO2Zhihao Shen, Bowlin E. Thompson, and Mark A. McHughView Author Information Philip Morris USA Postgraduate Research Program, 4201 Commerce Road, Richmond, Virginia 23234, and Department of Chemical…
X-ray photon correlation spectroscopy experiments were conducted on bicontinuous microemulsion and lamellar phases in polystyrene/polyisoprene/poly(styrene- b -isoprene) blends. Regardless of the microstructure, the scattering intensity autocorrelation function at low temperatures in the vicinity of the primary X-ray…
The research work conducted in our group concerning the study of the potassium-catalyzed NO x reduction by carbon materials is presented. The importance of the different variables affecting the NO x −carbon reactions is discussed, e.g. carbon porosity, coal rank, potassium loading, influence of the binder used, and ef…
Abstract A water pipe, formed exclusively from lattice water molecules, is stabilized in an organic–inorganic hybrid materialCu 2 (phen) 2 (CH 3 COO)(CH 3 COOH)(H 2 O) 2 ][Al(OH) 6 Mo 6 O 18 ] · 28H 2 O ( 1 ). Compound 1 consists of an Anderson‐type heteropolyanion, a copper acetate dimer, and 28 lattice water molecul…
The thermal conductivity of carbon-doped silicon dioxide films, fabricated to potentially serve as interlayer materials with low dielectric permittivity in small circuits, has been recently measured [B. C. Daly et al., Physica B 316-317, 254 (2002)]. Trends in the results were found to be inconsistent with the minimum…
We propose a model for calculating the phonon frequencies of any $(n,m)$ nanotube by considering explicitly the curvature of the system and the effects of long-range interactions determined by $\ensuremath{\pi}$ electrons. We show that the electron-phonon coupling strength is directly related to the electronic structu…
Aluminum (III) meso-tetraphenylporphyrins axially bonded to phosphinate anions have been synthesized and characterized by NMR and UV-visible spectroscopy, single-crystal X-ray diffraction, and FAB+ mass spectrometry. According to the solvent and the size of the anion, these compounds are able to self-assemble in two d…
Mesoporous palladium/silicon nitride nanocomposites were prepared via three different chemical routes to generate simultaneous control of the solid-state morphology of the palladium nanoparticles and that of the silicon nitride support at the same time as controlling the pore size and size distribution. Pyrolysis of t…
The mechanical properties, phase composition, and molecular motions of thermally processed wheat gluten- (WG-) based natural polymer materials were studied by mechanical testing, dynamic mechanical analysis (DMA), and solid-state NMR spectroscopy. The performance of the materials was mainly determined by the denaturiz…
In this study, we demonstrate reversible changes in lattice spacing within colloidal crystals controlled by an electric field. Crystals are assembled from negatively charged, monodisperse latex particles (945 nm) in an aqueous dispersion, by the application of an alternating electric field (1 kHz, ∼35 kV m −1 ). The l…
Citrobacter freundiil-tyrosine phenol-lyase (TPL) was inactivated by a Pictet-Spengler reaction between the cofactor and a substrate, 3,4-dihydroxyphenyl-L-alanine (L-dopa), in proportion to an increase in the reaction temperature. Random mutagenesis of the tpl gene resulted in the generation of a Thr15 to Ala mutant…
Abstract Summary: Fibers were spun from a lyotropic solution of a high‐molecular‐weight ( η = 5.89 g · dL −1 ), rigid‐rod, fully aromatic polyimide precursor polymer in a dry‐jet, wet‐spinning process in NMP. Acetone was identified as the coagulant of choice since fibers could be drawn extensively in this solvent, res…
The electronic and optical properties of colloidal multishell $\mathrm{Zn}\mathrm{S}∕\mathrm{Cd}\mathrm{S}$ nanoscale heterostructures have been studied in the framework of empirical tight-binding models. Our approach takes into account the effects of the strain caused by the large lattice mismatch at the interface be…
The binding of the model proteins HSA, LYZ and MYO to PEC nanoparticles is reported. PEC particles were prepared by mixing solutions of PDADMAC either with PSS or PMA-MS, followed by consecutive centrifugation. Monomodal anionic (PEC-1.50) and cationic (PEC-0.66) PEC particles were obtained using non-stoichiometric mi…
Second-harmonic generation in 60GeS(2)-20Ga(2)S(3)-20KBr chalcohalide glass was investigated by the thermal poling method. A large second-order nonlinear susceptibility, as high as 7.0 pm/V, was obtained in a poled sample by Maker fringe analysis. We believe this to be the first time that a clear second-harmonic wave…
Many endocrine and neuroendocrine cells contain specialized secretory organelles called dense core secretory granules. These organelles are the repository of proteins and peptides that are secreted in a regulated manner when the cell receives a physiological stimulus. The targeting of proteins to these secretory granu…