Materials Literature
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The role of damage on the mechanical response of a heterogeneous material was investigated through X-ray tomography combined with in situ tensile deformation. This technique enables one to follow the same population of damage-nucleating particles throughout a tensile test. The results indicate that heterogeneity in th…
Small scale yielding around a mode I crack is analysed using polycrystalline discrete dislocation plasticity. Plane strain analyses are carried out with the dislocations all of edge character and modelled as line singularities in a linear elastic material. The lattice resistance to dislocation motion, nucleation, inte…
The analysis of the physical mechanisms controlling plastic flow in pure polycrystals satisfying to Von Mises conditions, whose grain size d is larger than about one micron (standard polycrystals), is shown to stem from the enhanced multiplication of dislocations induced by the locking of dislocations at grain boundar…
A two-dimensional version of the shear-transformation-zone (STZ) theory by Falk and Langer is explored numerically. Two different geometries are used to simulate uniaxial tension experiments where materials are subjected to constant strain rates. In the first setup, a rectangular specimen is given an imperceptible ind…
The wavelength-dependent second-harmonic generation (SHG) efficiency of two simple dipolar chromophores, 4-NO2C6H4N(H)Bun (1) and 4-NO2C6H4SN(H)But (2), was compared in solution and in the solid state. Hyper-Rayleigh scattering measurements at 532 nm provided comparable molecular first hyperpolarizabilities. Both comp…
Reflection measurements in the 25-35 nm region were made for Mg/SiC and Mg/Y2O3 multilayers kept in a low-humidity atmosphere for 4 or 5 years. Aged Mg/SiC multilayers keep their reflectances, and the reflectance value at 31.2 nm is 0.44 at 10 degrees of the normal angle of incidence. Aged Mg/Y2O3 multilayers change r…
Interfaces adsorbing solid particles have recently attracted great attentions in the field of materials science, because they are useful as templates of well-ordered particle arrays or of microstructured hollow spheres. The solid particles are adsorbed at the interfaces and form self-assembled structures when the part…
Commercially available asymmetric porous stainless steel (APSS) tube filters with a smooth top layer were employed as substrates for preparing thin Pd-based composite membranes. The simple electroless plating and electroplating methods cannot successfully prepare defect-free thin (less than 6 μm) Pd-based membranes on…
New applications in regenerative biotechnology require the ability to understand and control protein-surface interactions on micrometer and submicrometer length scales. Evidence presented here shows that micropatterned amphiphilic comb polymer films exhibit a pretreatment-dependent behavior with respect to protein ads…
We report on the synthesis and structure of tribasic lead maleate hemihydrate ([Pb4O3]C2H2(CO2)2.(1/2)H2O, TRIMAL) and lead maleate (PbC2H2(CO2)2, PBMAL). The structure of [Pb4O3]C2H2(CO2)2.(1/2)H2O, solved ab initio from X-ray powder diffraction data, consists of infinite slabs of edge-sharing OPb4 tetrahedra, of com…
Abstract High-density graft films bearing ferrocene (Fc) moieties were fabricated on quartz and indium tin oxide (ITO) substrates by surface-initiated atom transfer radical polymerization (ATRP). The thickness of the film increased with the increase in the molecular weight of the polymer. We successfully observed quan…
Abstract A binuclear iron(III) complex bridged by trans-1,2-bis(4-pyridyl)ethylene, [LFeIII(vibpy)FeIIIL](BPh4)2, showed a gradual two-step spin crossover behavior, where H2L is bis(3-methoxysalicylideneaminopropyl)methylamine and BPh4− is tetraphenylborate. The single-crystal X-ray analysis at the intermediate state…
The heat capacities, C p, of poly(oxyethylene), POE, with molar masses from 1500 to 900 000 Da, were analyzed by differential scanning calorimetry (DSC), quasi-isothermal, temperature-modulated DSC (TMDSC), and wide-angle X-ray diffraction (WAXD). There is no change in crystal structure before melting, but the lattice…
The Debye series decomposition of the partial-wave scattering amplitudes of a multilayer sphere is derived. The partial-wave transmission and reflection terms appearing in the Debye series are multiple-scattering amplitudes written in terms of four basic quantities and combined together layer by layer in an identical…
TbCu 3 Mn 4 O 12 perovskite has been prepared in polycrystalline form under moderate pressure conditions of 2 GPa, in the presence of KClO 4 as oxidizing agent. This material has been studied by X-ray and neutron powder diffraction (XRD and NPD) and magnetotransport measurements. The crystal structure is cubic, space…
A parallel solution combustion synthesis technique was developed for combinatorial materials studies. The vigorous combustion reactions were successfully limited in the microreactors by using a substrate-net-mask microreactor system and the lowest adoptable furnace temperature. Using this technique, a luminescent mate…
The influence of solvents (alcohols and binary mixtures of alcohol and water) on the structure and permeability of self-assembled layer-by-layer polyelectrolyte multilayers (PEMs) has been investigated by in situ atomic force microscopy (AFM), cyclic voltammetry (CV), and confocal laser scanning microscopy (CLSM). A d…
A banana-shaped spin-crossover (SCO) cobalt(II) complex [Co(C16-terpy)2](BPh4)2 (1) with long alkyl chains, based on a terpyridine frame, was synthesized. Compound 1 exhibited very gradual SCO behavior and changes in the dielectric constant. This shows a way in which SCO materials can be used in electronic devices.
Volatile low-melting CuII metal complexes Cu[OC(CF3)2CH2C(Me)=NMe]2 (4) and Cu[OC(CF3)2CH2CHMeNHMe]2 (5) were synthesized and characterized by spectroscopic methods. A single-crystal X-ray diffraction study on complex 4 shows the anticipated N2O2 square-planar geometry with the imino alcoholate ligand arranged in the…
Abstract An efficient green emitting phosphor, Eu2+-doped Ca3SiO4Cl2, is reported. Its excitation band is extending from 260 to 470 nm, which is coupled well with the emission of UV LED (350–410 nm) and blue LED (450–470 nm). It exhibits a strong green emission centered at 505 nm with chromatic coordination (0.25, 0.5…