Materials Literature
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Glossic Fragiudalfs comprise several million hectares of agronomically important soils within the silty uplands of the lower Mississippi River Valley (Major Land Resource Area [MLRA] 134). These soils are typified by a fragipan within 100 cm of the surface overlain by a 5‐cm‐thick, or more, glossic horizon containing…
An investigation of particle contamination in uniform and coaxial fields.
Diethyl carbonate (DEC) and diols, such as 1,3-propanediol and 1,4-butanediol, were polymerized by a lipase at a temperature between 40 and 80°C to yield the corresponding aliphatic polycarbonates in a successive two-step polymerization. Bulk polymerization, especially at a temperature between 70 and 75°C, and prefera…
Molecular-dynamics simulations are used to apply shear to the twinned microstructure of an hcp metal, represented by a Finnis-Sinclair-type potential for zirconium. The twinned microstructure results from a simulated martensitic phase transition from the high-temperature phase, and hence contains some boundary defects…
The structure of LaAlO 3 has been investigated around the phase transition at T c ≈ 800 K by neutron powder diffraction in vacuum and by X-ray powder diffraction under nitrogen atmosphere as well as by a very high resolution synchrotron experiment in air. The results were analysed in frame of the Landau theory using t…
The solubility of H 2 O in three melt compositions along the haploandesite join Na 2 Si 4 O 9 - Na 2 (NaAl) 4 O 9 (0, 3, and 6 mol% Al 2 O 3 ) was determined as a function of pressure and temperature from 0.8 to 2.0 GPa and 1000 to 1300 °C. Water solubility is a linear (or near-linear) positive function of pressure (1…
We describe two electro-optical systems for adaptive focusing of linearly polarized light. The aperture size is 5 mm and the focal length can be varied from 1 to 4 m for wavelengths from 0.663 to 0.85 μm. The first is a commercially available system including a PC compatible control unit and software, and an adaptive…
Die Existenz einer lückenlosen Mischkristallreihe Cu1–xZnxMoO4 (0 ≤ x ≤ 1) wird nachgewiesen. Einkristalle wurden durch Chemischen Transport mit verschiedenen Transportmitteln erhalten. Die Charakterisierung der Zusammensetzung und der Struktur erfolgte durch EDX-Analyse, durch Photometrie und durch Röntgenbeugung an…
This article presents the oxidation kinetics of Cu thin films in dry and wet oxygen at temperatures from 100 to 600 °C. Spectroscopic ellipsometry and reflectometry, which yield refractive index and thickness of the Cu oxide, were used in kinetic study of Cu film oxidation. Cabrera–Mott (C–M) theory was used for the c…
Surface wetting measurements and several analytical techniques including FTIR/ATR, DSC, TGA, and pyrolysis-GC/MS are used to characterize the noncellulosic components of developing cotton fibers as intact components of the fiber structure. Water contact angle measurements are most sensitive to the presence of hydropho…
Glass-forming liquid crystals combine the ability of liquid crystals to self-organize and that of polymers to undergo glass transition (instead of crystallization) upon cooling. Here is reported the synthesis and implementation of novel right- and left-handed chiral-nematic glass-forming liquid crystals in optical not…
Based upon a consideration of the similarity in the driving force of polymer crystallization to the mesophase formation from the melt state, the equilibrium melting point of chain polymers relating to the details of molecular structure and the impure environment of crystallites was studied by classical lattice statist…
The formation and temporal evolution of domain structures during a hexagonal → orthorhombic transformation is studied using computer simulations based on a continuum diffuse-interface phase-field approach. All the essential driving forces for the domain formation and evolution are taken into account, including the bul…
Thin-film diode structures made by the sequential adsorption of redox-active polymers and semiconductor nanoparticles are explored here. In this work, TiO2 nanoparticles and graphite oxide (GO) nanoplatelets are used as electron- and hole-conducting components, respectively, and a [Ru(bpy)3]2+-containing polymer (RuP,…
Despite its widespread use, the composition and structure of γ-alumina have been the subject of controversy for decades. In this article we review the historical attempts to resolve two principal questions that have each been extensively debated, but in independent communities: (1) What is the distribution of vacancie…
Future combat systems necessarily focus on lightweight, highly mobile and transportable armored vehicles. Lightweight composite integral armor systems are being developed to meet these needs. The goal of this paper is to centrally document the myriad design requirements for composite integral armors that serve multifu…
In this paper we show the effect of Mn site substitution $(<~10%)$ by Co and Cr on the magnetotransport properties of ceramic samples of ${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}.$ Resistivity, magnetization, and magnetoresistance were systematically investigated as a function of doping. An increase…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMetal Template-Assisted Block Copolymer Synthesis: Use of Solvent Polarity to Control Chain Conformation and Reactivity at the Metal CoreCassandra L. Fraser, Adam P. Smith, and Xufeng WuView Author Information Department of Chemistry University of Virginia McCormick Ro…
The fluorescence characteristics of different Ce3+:Er3+-codoped fluoride host glasses, such as fluorozirconate and fluoroindate glass, are reported. It is shown that Ce3+ codoping into Er3+ doped fluoride glasses resulted in a quenching of Er3+ ions from the I11/24 to the I13/24 state, and the branching ratio for the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Conducting Poly(cyclophane) and Its Poly([2]-catenane)Davide L. Simone and Timothy M. SwagerView Author Information Department of Chemistry and Center for Materials Science and Engineering, Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, Mas…