Materials Literature
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Abstract (Sr 1− x Ca x )Bi 2 Ta 2 O 9 bismuth‐layered compounds with composition x = 0, 0.2, 0.4, 0.6. 0.8 and 1.0 were synthesized by the conventional solid‐state route. Phase formation and structural evaluation of both calcined powders and sintered pellets were investigated using x‐ray diffraction and micro‐Raman sp…
Five Pt−Sn/Vulcan carbon nanocomposites containing metal nanoclusters highly dispersed on a carbon powder support have been prepared using trans -PtCl(PEt 3 ) 2 (SnCl 3 ) as the source of metal. Thermal gravimetric analysis of the decomposition of this complex in air reveals a single-step loss of all nonmetallic eleme…
The magnetic properties of single-crystalline ${\mathrm{Nd}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ were studied with both macroscopic and microscopic probes. The magnetization shows large irreversibility behavior between zero-field-cooled and field-cooled data at low field, suggesting a phase separation driven b…
We present distribution coefficients and crystal purity data for systems containing two of the three near-isomorphic amino acids l -leucine (LEU), l -isoleucine (ILE), and l -valine (VAL) in aqueous solutions. The data validate our earlier observation that the extent of impurity incorporation in amino acid crystals is…
Abstract Colloidal gold particles (11.2 nm) were coated with platinum overlayers, resulting in bimetallic particles with 1–8 mol% Pt. These particles were characterized using electron microscopy, energy‐dispersive x‐ray spectroscopy and electrochemistry confirming the Au–Pt core‐shell structure. The UV–visible spectra…
Abstract Cleaning substrate surfaces and checking the effectiveness of the cleaning method are two very important aspects of reliable surface analysis. The absence of a cleaning process leading to an yttria‐stabilized zirconia (YSZ) surface that is free of contaminants and of unchanged structure has inspired us to inv…
Abstract Two binary alloys (Fe–0.5 wt.% Si and Fe–1.5 wt.% Mn) and a high silicon steel were used to investigate the thermochemical phenomena occurring at the sample free surface during simulation annealing cycles aimed to achieve a hot‐dip galvanizing‐compatible surface condition. The samples were annealed for 60 s a…
Methane activation is a crucial step in the conversion of methane to valuable oxygenated products. In heterogeneous catalysis, however, methane activation often leads to complete dissociation: If a catalyst can activate the first C–H bond in CH4, it can often break the remaining C–H bonds. In this study, using density…
A highly ordered multilayer film was formed by casting chloroform solutions of an ionic complex between a dimethyldioctadecylammonium (DODA) and a phosphomolybdate anion PMo12O403− (PMo12) on a glassy carbon electrode and solid substrates (CaF2, quartz, and borosilicate glass). A well-ordered lamellar superlattice str…
We discuss atomistic simulations of dislocation processes in copper based on effective medium theory interatomic potentials. Results on screw dislocation structures and processes are reviewed with particular focus on point defect mobilities and processes involving cross slip. For example, the stability of screw disloc…
A model is developed in the form of one or two partial differential equations (master Smoluchowski-like equations) that describe evolution of the size distribution of polymer species formed in a step-growth polymerization of an AB 2 monomer. Groups B react with a substitution effect; i.e., they are initially equally r…
Photon-emission spectra have been measured for individual titania-supported gold particles excited by the electron current from an STM tip. Depending on the interaction strength between tip and cluster, the emission behavior changes from excitations with Mie-plasmon character at 2.3 eV to modes of tip-induced plasmons…
Lasing is reported at the edge and in the middle of the selective reflection band produced in the visible region of the spectrum for the cholesteric phase of a lyotropic liquid crystal formed from an optically active polyisocyanate in toluene. This is the first observation of lasing from a stiff polymer based lyotropi…
Amorphous phase in semicrystalline poly(ethylene terephthalate) (PET) was investigated via its physical aging behavior. It was found that when the degree of crystallinity ( f c w ) was within a definite range, there were dual amorphous regions with quite different characters in semicrystalline PET: free amorphous regi…
We investigated temperature $(T)$- and magnetic field-dependent optical conductivity spectra $\ensuremath{\sigma}(\ensuremath{\omega})$ of a ${\mathrm{La}}_{5/8\ensuremath{-}y}{\mathrm{Pr}}_{y}{\mathrm{Ca}}_{3/8}{\mathrm{MnO}}_{3}(y\ensuremath{\approx}0.35)$ single crystal, showing intriguing phase coexistence at low…
Submicrometric hollow spheres with mesoporous walls were prepared by applying the synthesis of MSU-X type mesoporous silica at neutral pH. The application of ultrasound in the proper power range, to a mixture of nonionic polyoxyethylene surfactant and unreacted silicon alkoxide (tetraethylorthosilicate) gives a stable…
This paper discusses some current trends in computational materials science, especially the striving to forge links between modelling activities at various length and timescales. At the atomistic scale, methods based on quantum mechanical, especially density-functional, theories for electronic properties link to atomi…
The photoorientation process in a polyester with 4-cyano-4‘-alkoxyazobenzene side group and long methylene spacers in the side and the main-chain was studied as a function of irradiation with linearly polarized light of 488 nm under systematic variation of the power density and temperature. This model polymer is chara…
Most previous atomistic simulations of heterophase interfaces have neglected misfit , the discrepancy between the interatomic length scales parallel to the interface of the two phases. The obstacles to quantitative calculations of interface energies in the presence of misfit are assessed. The most straightforward appr…
A characteristic feature of the physics in transition-metal oxides is that the charge, spin, and lattice degrees of freedom are strongly coupled. The key to understanding these strong mutual couplings is the orbital degree of freedom (ODF), which plays a crucial role in controlling the phases and various physical prop…