Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Polyoxometalate Transfer Reagent: Synthesis, Structure, and Reactivity of Zirconocene Polyoxometalate [(PNbW11O40)2ZrCp2]6-Emil V. Radkov, Victor G. Young, and Robert H. BeerView Author Information Departments of Chemistry Fordham University, Bronx, New York 10458 Co…
The Channel-Spark method was used for deposition of highly oriented ferromagnetic La0.7Sr0.3MnO3 films on NdGaO3 substrates. It was found that additional oxygen decreases the film quality suppressing the Curie temperature and metal–insulator transition below room temperature. To achieve the best quality of the films t…
Icosahedral Al-Pd-Mn single quasicrystals were deformed between room temperature and 400°C by Vickers hardness testing. The surface morphology was investigated by profiling and scanning electron microscopy. Specimens were prepared for cross-sectional observation in transmission electron microscopes using a focused ion…
Improvements in the characteristic properties of jute-polypropylene composites were obtained with the application of MAH grafted PP copolymers as a coupling agent to the fiber. SEM investigations demonstrated that fiber pull-out is reduced after the modification with the coupling agent. This improved fiber-matrix adhe…
ABSTRACT The effects of raw and gelatinized sorghum and rice flours on the structure and texture of baked corn and tortilla chips were evaluated. Dry masa flour was hydrated into masa, sheeted, and cut. Corn chips were baked in an air‐impingement oven, and tortilla chips were baked first in a three‐tier oven and then…
Water plays an essential role in most biological processes. Water molecules solvating biomolecules are generally in fast exchange with the environment. Nevertheless, well-defined electron density is seen for water associated with proteins whose crystal structure is determined to high resolution. The relative accessibi…
Following the parametrization scheme first introduced by Goodwin, Skinner, and Pettifor, we propose here a model of the empirical tight-binding Hamiltonian for selenium, based on the fitting of cohesive energy curves obtained from density-functional calculations for solid phases, rings, and chains structures. We have…
Dielectric constant, loss factor and remanent polarization were investigated as a function of temperature for PBZT - type ceramics with Zr/Ti ratio equal 70/30 and Ba contents x = 0.25÷-0.35. Additionally measurements of pyroelectric and thermally stimulated depolarization currents were carried out. The reported exper…
We study the electronic structure and the optical properties of germanium clusters up to about 103 atoms, by using a semi-empirical tight-binding approach. Germanium nanocrystals are related to quantum dots growing, by a self-organization process, in sapphire matrices. The optical properties of such dots are experimen…
A new method to extract quantitative information from poorly resolved 29 Si magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectra of natural mixed-layer illite-smectite (I-S) clays is presented. The Si-Al distribution in layered aluminosilicates are used to link the intensities of 29 Si resonances from a…
Beim Einengen einer Lösung von Er2(SO4)3 in Wasser erhält man Er2(SO4)3 · 8 H2O in Form von blaßrosa Einkristallen. Nach Auskunft der Einkristallstrukturanalyse kristallisiert die Verbindung monoklin (C2/c, Z = 8, a = 1346,1(3), b = 667,21(1), c = 1816,2(6) pm, β = 101,90(3)°, Rall = 0,0169) mit achtfacher Koordinatio…
This simple experiment illustrates the main features of excited oxygen in the singlet state 1 O 2 ( 1 D g ): (i) its high oxidizing power and its selectivity towards unsaturated organic compounds, (ii) its low excitation energy which allows its access by various chemical processes and (iii) its long lifetime compared…
The structure of human insulin mutant B9 (Ser-->Glu) was determined by an X-ray crystallographic method at 2.5 A resolution with an R factor of 0.165 under non-crystallographic restraints. The crystals were grown at low pH (<3.8) and belong to the orthorhombic P2(1)2(1)2(1) space group with unit-cell dimensions a = 44…
Sso7d is a basic 7-kDa DNA-binding protein from Sulfolobus solfataricus, also endowed with ribonuclease activity. The protein consists of a double-stranded antiparallel beta-sheet, onto which an orthogonal triple-stranded antiparallel beta-sheet is packed, and of a small helical stretch at the C-terminus. Furthermore,…
Creation of an autologous heart valve by tissue engineering offers a promising approach to cardiac surgery. Although we have demonstrated successful formation of native valve analogous tissue in vitro, hemodynamic competence remains a serious problem. The aim of this study was to optimize in vitro formation of collage…
The realization of electrooptic coefficients leading to digital drive voltage levels is an important objective if polymeric electrooptic materials are to achieve significant commercial application. Polymeric materials characterized by electrooptic coefficients somewhat greater than those of the dominant commercial mat…
Summary Much of the Paris Basin is covered with loess, dominated by particles 2–50 μm in diameter, which has undergone strong pedogenesis. We have investigated the mineralogical changes that have accompanied the development of a Podzoluvisol in such material. Four silt‐size and two clay‐size fractions from five horizo…
Spark plasma sintering (SPS) was applied to the production of non-lead ferroelectric Bi 4 Ti 3 O 12 ceramics. A powder compact of a calcined oxide mixture was embedded in a mixture of ZrO 2 and Sb-doped SnO 2 powders in a carbon die and heated for a very short duration under a constant current of 450 A. This process l…
A series of SiC‐AlN compositions of 0, 10, 25, 50, 75, 90, and 100 mol% AlN were hot pressed at 2100°C for a 1 h soak at a pressure of 35 MPa under vacuum. 2H‐wurtzite SiC‐AlN solid‐solution structures were formed for compositions with 25‐100 mol% AlN. The associated lattice parameters for these solid solutions follow…
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