Materials Literature
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The effects of doping Co for the Ga site on the oxide ion conductivity of La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3 have been investigated in detail. It was found that doping Co is effective for enhancing the oxide ion conductivity. In particular, a significant increase in conductivity in the low-temperature range was observed.…
Accurate orthogonal tight-binding Hamiltonians are constructed for ferromagnetic SrRuO$_3$ and the layered perovskite superconductor, Sr$_2$RuO$_4$ by fitting to all-electron full-potential local density band structures obtained by the linearized augmented planewave method. These Hamiltonians allow the band structure…
In this work we first study the quantum diffusion in a volume of a crystalline solid at high interstitial concentrations when the effects of the short-range interactions between the diffusing particles are to be factors. Within the scope of the small-polaron formalism the transition rate depending on both the temperat…
Superparamagnetism is a unique feature of magnetic nanoparticles. Spinel ferrite nanoparticles provide great opportunities for studying the mechanism of superparamagnetic properties. CoFe 2 O 4 nanocrystallites have been synthesized with a microemulsion method. The neutron diffraction studies and the temperature-depen…
Light scattering has been used to investigate the effect of shear-induced demixing (SID) in polystyrene/poly(vinyl methyl ether) blends of diverse molecular weight distributions down to −30 K below the quiescent spinodal temperature of any blend. The early stage of the demixing process, observed along the vorticity di…
Thermally reversible organogels, comprised of a variety of organic liquids and low concentrations of relatively low molecular mass aza analogues of previously investigated ALS (i.e., aromatic linker steroid) molecules have been investigated. The aza-ALS gelators are derivatives of 3β-cholesteryl 4-(2-anthrylamino)buta…
The aim of this study is to determine the effects of plasticizer hydrogen bonding capability and chain length on the molecular structure of sodium caseinate (NaCAS), in NaCAS/glycerol and NaCAS/polyethylene glycol 400 (PEG) systems. Both solution and film phases were investigated. Glycerol and PEG reduced the viscosit…
The room-temperature reactions of excess Ti(O i Pr) 4 with the hydroxyl groups of a nonporous silica yield dinuclear surface complexes regardless of the degree of partial dehydroxylation of the silica. The surface reactions were studied by in situ IR transmission spectroscopy, 13 C CP/MAS NMR, GC/MS, and elemental ana…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of Aβ(10-35)-PEG Block Copolymer FibrilsTimothy S. Burkoth, Tammie L. S. Benzinger, Volker Urban, David G. Lynn, Stephen C. Meredith, and P. ThiyagarajanView Author Information Departments of Chemistry and Pathology The University of Chicago, Chicago, Ill…
Electron momentum density and Compton profiles in Lithium along $<100 >$, $<110>$, and $<111>$ directions are calculated using Full-Potential Linear Augmented Plane Wave basis within generalized gradient approximation. The profiles have been corrected for correlations with Lam-Platzman formulation using self-consisten…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Structurally Well-Defined Polymer−Nanoparticle Hybrids with Controlled/Living Radical PolymerizationsTimothy von Werne and Timothy E. PattenView Author Information Department of Chemistry University of California at Davis One Shields Avenue, Davis, Calif…
Sapphire is an ideal visible-MWIR window due to its excellent optical and mechanical properties and its availability in large sizes up to 340-mm diameter boules. Anticipated applications for new, high performance optical systems call for even larger, 450-750 mm diameter, windows. The present effort has focused on prod…
We substituted neutral amino acids for some positively charged residues (R42, K107, K146, R148 and K229) that line the active site of aldolase A in an effort to determine binding sites for inositol 1, 4,5-trisphosphate. In addition, D33 (involved in carbon-carbon bond cleavage) was mutated. K229A and D33S aldolases sh…
It has recently been brought to my attention (M J Sablik, 1999, private communication) that in the above paper, which outlines a pair of differential equations for describing reversible and irreversible effects of stress on magnetization, part of the results shown in figure 9 cannot be obtained as a result of the appl…
In the present paper we report a high-fill factor uncooled IR micro-bolometer array; and, more particularly, a three- level IR bolometer including an almost 92 percent fill factor absorber and a separately-designed bridge structure for the electro-thermal isolation of thermal sensor; and a method for the silicon-based…
Impact of 600 eV protons at grazing incidence on LiF(100) is studied with a new coincidence technique combining energy loss and electron spectroscopy. Correlation between the secondary electrons and the charge state of the scattered projectiles demonstrates the role of the ${\mathrm{H}}^{\ensuremath{-}}$ ions formed o…
The dielectric properties of a MgO and Mg(NO 3 ) 2 doped and undoped talc are measured as a function of the frequency range 260 kHz-40 MHz. The ´, tan and ac values are given as a function of the firing temperature for a 5.0 MHz constant frequency. In this study the effects of an impurity and the firing temperature on…
We calculate the linear optical response of island films, considering, in particular, a statistical character of the geometry of the cluster assembly as well as electromagnetic interaction between the clusters in the film. The work involves Monte Carlo simulations of the island-film growth followed by aggregate calcul…
This paper will report on the properties and applications of polished polycrystalline diamond optical components produced by Chemical Vapor Deposition and fabricated in sizes and geometries suited to several IR window and some applications. Data will be presented on optical quality CVD diamond materials that has been…
We have investigated the performance of VO<SUB>2</SUB> microbolometers biased on the semiconducting-metal phase transition with negative electrothermal feedback. We deposited crystalline thin films of phase-pure VO<SUB>2</SUB>, patterned these films into useful test structures, and evaluated the electrical and optical…