Materials Literature
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Bioartificial polymeric materials represent a new class of polymeric materials based on blends of synthetic and natural polymers, designed with the purpose of producing new materials with enhanced properties with respect to the single components. The mechanical properties of bioartificial materials prepared using poly…
We have investigated the appearance of ferromagnetism in a mixture of nonferromagnets ${\mathrm{LaMnO}}_{3}$ and ${\mathrm{LaCoO}}_{3}$, without heterovalent ion substitution in La sites. ${\mathrm{LaMn}}_{0.85}$${\mathrm{Co}}_{0.15}$${\mathrm{O}}_{3}$ and ${\mathrm{La}}_{0.7}$${\mathrm{Sr}}_{0.3}$${\mathrm{Mn}}_{0.8}…
Stable colloidal suspensions of rodlike cellulose crystallites, prepared by acid hydrolysis of cellulose fibers, form a chiral nematic phase above a critical concentration. The direction of the chiral nematic axis may be controlled by applying a strong magnetic field. In the presence of Congo red, a dye with strong af…
γ‐Al 2 O 3 is a defective spinel phase of alumina with cation site vacancies randomly distributed. Its structure and properties are not well understood. There has been long‐standing controversy as to whether the cation vacancies are located at the tetrahedral sites or the octahedral sites. Based on an empirical pair p…
Abstract A new theoretical approach is proposed for the yield stress of concentrated, flocculated particulate suspensions. Explicit cognizance is taken for the three‐dimensional, mechanically rigid particle network held together by interparticle forces wherein the mean coordination number in the assemblage increases a…
Highly transparent conductive Ga-doped zinc oxide (ZnO:Ga) has been deposited on 3 in.×4 in. Corning 7059 glass and other substrates using a high speed rotating disk reactor low pressure metal organic chemical vapor deposition system. Diethylzinc, oxygen, and triethylgallium were used as precursors. The films exhibit…
Poly(4,4‘-dialkyl-2,2‘-bithiazole-5,5‘-diyl)s (PRBTz, alkyl = methyl (PMeBTz), butyl (PBuBTz), and heptyl (PHepBTz)) and their analogues comprised of 33−150 thiazole rings have been prepared by organometallic polycondensation, and their chemical and physical properties are compared with those of π-conjugated poly(thio…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPrototropic vs Whole Water Exchange Contributions to the Solvent Relaxation Enhancement in the Aqueous Solution of a Cationic Gd3+ Macrocyclic ComplexSilvio Aime, Alessandro Barge, Mauro Botta, David Parker, and Alvaro S. De SousaView Author Information Dipartimento di…
The reaction between nitrogen oxides and carbon generates nitrogen-containing complexes on the carbon surface. The use of X-ray photoelectron spectroscopy allowed the characterization of these surface complexes. Five distinct structures have been distinguished, corresponding to nitrogen incorporated in five- and six-m…
Solid‐oxide fuel cells (SOFCs) with electrolytes that provide high open‐circuit voltage (OCV) and low ohmic loss down to 550°C are described. The electrolytes were bilayers consisting of a 4 to 8 μm thick Y‐doped ceria (YDC) layer with a 1 to 1.5 μm thick Y‐doped zirconia (YSZ) layer on the fuel side. The cathode/supp…
The lithium ion charging capacity and cycling stability of vanadium oxide thin‐films prepared by pulsed laser deposition (PLD) are reported. PLD films were prepared at various temperatures and atmospheres from a V 6 O 13 target. The charging capacity of these films depended strongly on the substrate deposition tempera…
The influence of precursor characteristics and synthesis conditions on the formation of yttrium aluminum garnet, Y 3 Al 5 O 12 (YAG), was investigated using “single‐source” precursors (cohydrolyzed yttrium and aluminum alkoxides and yttrium aluminum glycolates) and “multiple‐source” precursors (mixtures of metal nitra…
The previously unknown crystal structure of the polymer/salt complex poly(ethylene oxide):${\mathrm{NaSO}}_{3}$${\mathrm{CF}}_{3}$ was solved from a powder-diffraction pattern collected on a laboratory x-ray diffractometer. The solution was performed starting from a random arrangement of constituent molecular fragment…
Diatom assemblages from eight basins of northwest Scotland, isolated from the sea during the Late Devensian and Holocene, show Paralia sulcata abundant towards the ingression and isolation contacts of the sedimentary sequences. Across the contacts, Paralia sulcata is commonly replaced by, or associated with, salt-tole…
A phenomenological theory is presented to describe ferroelectric superlattices with first-order phase transitions. Static properties including the Curie temperature, spontaneous polarization and dielectric susceptibility are discussed with model parameters appropriate to ${\mathrm{BaTiO}}_{3}$/${\mathrm{PbTiO}}_{3}$.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTReversible Structural Transformation and Drastic Magnetic Change in a Copper Hydroxides Intercalation CompoundWataru Fujita and Kunio AwagaView Author Information Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo Komaba, Meguro-…
The large penetration power of high-energy X-rays (>60 keV) raises interesting prospects for new types of structural characterizations of polycrystalline materials. It becomes possible in a non-destructive manner to perform local studies, within the bulk of the material, of the fundamental materials physics properties…
A systematic study on the epitaxial growth of VO2 films deposited on sapphire by sputtering at various substrate temperatures (Ts) was carried out. The deposited films were characterized by x-ray diffraction, high energy electron diffraction, Rutherford backscattering spectrometry, atomic force microscopy, and spectro…
The all-electron full-potential linear combinations of Gaussian-type orbitals---fitting-function technique has been used to calculate the electronic structure, equation of state (EOS), and elastic constants for crystalline graphite. An analysis of the zero-pressure band structure is used to resolve inconsistencies bet…
High-surface area RuO 2 −TiO 2 is an important material for catalytic and power source technologies. To create this mixed oxide as a nanoscale, high-surface-area material, we have synthesized electrically conductive aerogels of Ru n Ti 1- n O x via sol−gel chemistry and supercritical drying of the resulting gel. The s…