Materials Literature
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First principles calculations have been made to theoretically interpret the structural stability of SrTiO3 as a function of pressure or strain. We show that the orthorhombic Pbnm structure is more stable than the ideal perovskite one due to rotations of TiO6 octahedrons at high pressures or deformations of TiO6 octahe…
The preparation and characterization of second-generation electron-poor Pt(II) complexes of general formula [(P−P)Pt(C 6 F 5 )(H 2 O)][X], 1a − h (P−P = diphosphine, X = BF 4, OTf), bearing a pentafluorophenyl ligand is reported. The complexes are investigated as catalysts in the epoxidation of alkenes with hydrogen p…
The dielectric measurements have been carried out on the two zeroth generation dendrimers with four branched arms (called tetrapodes) based on the siloxane cores. The results are analyzed in the framework of the molecular theory of dielectric permittivity by Maier and Meier for nematogens. At least four molecular proc…
The exact perovskite structure has simple cubic symmetry and composition ABO3, where A is a relatively large cation and B a smaller one. The choices of A and B cations, and the substitutions possible on either site, generate a large variety of materials sharing the same base, with relatively small distortions of the s…
Abstract The novel cationic complex [Ag 14 (C 2 t Bu) 12 ] 2+ has been synthesized by four reactions: reaction of [Ag(C 2 t Bu)] n and AgBF 4 in acetone in a 6:1 mole ratio, that of HC≡C t Bu and AgBF 4 in water in the absence of a base, treatment of [AgC 2 t Bu] n with HBF 4 in acetone or that of {[Ag 3 (C 2 t Bu) 2…
An anodic aluminum oxide (AAO) template is prepared by anodizing aluminum in oxalic acid solution. C60 crystals were grown, using the pressure difference method, in the pores of the template, representing a brushlike thin film layer with a honeycomb boundary structure in one side and nail arrays in the other side. Dif…
The dynamic dual chirality of D2-symmetric saddle-shaped porphyrin 1 decreases the stereochemical complexity of cocrystallization with racemic mandelic acid derivatives, such as BrMA, and allows spontaneous optical resolution (see picture). Each resulting cocrystal is porous and consists of one-handed double-helical p…
Vanadium dioxide (VO2) and vanadium pentoxide (V2O5) thin films are irradiated by a near-infrared continuous-wave laser beam and the dynamic optical limiting performance is measured. The temperature varying with time of the films induced by a laser beam is also recorded by an IR thermal sensor. Under the irradiation o…
We present structural and magnetic properties of polycrystalline ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{O}\phantom{\rule{0.3em}{0ex}}(x=0,0.02,0.05,0.0625,0.10,\phantom{\rule{0.3em}{0ex}}\mathrm{and}\phantom{\rule{0.3em}{0ex}}0.15)$ oxides synthesized by solid-state reaction via sintering $\mathrm{Z…
Abstract Three new lanthanide selenidoantimonates [Ln(en) 4 (SbSe 4 )] [Ln = La ( 1 ), Nd ( 2 )] and [Sm(en) 4 ]SbSe 4 · 0.5en ( 3 ) (en = ethylenediamine) were first synthesized by treating LnCl 3 , Sb, and Se in a stoichiometric ratio with en under mild solvothermal conditions. Compounds 1 and 2 are isostructural. T…
The utilization of biopolymers and the development of organic-inorganic hybrids are ever increasing interest of material science researchers around the globe for various applications. The present attempt is intended to prepare nanocomposites of lactic acid grafted chitosan and layered silicates. Nanocomposites were pr…
Abstract The deformation behavior of miscible PA6/aPA blends films under uniaxial and biaxial tensile drawing has been investigated in relation to blend composition. Whatever be the composition, the initial crystalline structure is ill‐ordered and no evidence of spherulitic morphology was shown. At temperatures beyond…
Collagen VI is a component of the extracellular matrix that is able to form structural links with cells. Collagen VI monomers cross-link into tetramers that come together to form long molecular chains known as microfibrils. Collagen VI tetramers are also the most likely candidates for the formation of banded aggregate…
Phase structures and enzymatic degradation of poly(l-lactide) (PLLA)/atactic poly(3-hydroxybutyrate) (ata-PHB) blends with different compositions were characterized by using atomic force microscopy (AFM). Differential scanning calorimetry (DSC) thermograms of PLLA/ata-PHB blends with different compositions showed two…
We investigate the dynamic fracture of a close-packed monolayer of particles, or particle raft, floating at a liquid-gas interface induced by the localized addition of surfactant. Unusually for a two-dimensional solid, our experiments show that the speed of crack propagation here is not affected by the elastic propert…
This work presents a systematic investigation of the performance of broken symmetry density functional theory for the evaluation of Heisenberg exchange constants. We study dinuclear Mn(IV)-Mn(IV) complexes with bis(μ-oxo), bis(μ-oxo)(μ-carboxylato), and tris(μ-oxo) cores for this purpose, as these are of fundamental b…
By utilizing multifrequency electron paramagnetic resonance (EPR) spectroscopy, the iron functional center in ${\mathrm{Fe}}^{3+}$-modified polycrystalline lead zirconate $(\mathrm{Pb}\mathrm{Zr}{\mathrm{O}}_{3})$ was studied. The single phase polycrystalline sample remained orthorhombic and antiferroelectric down to…
Two merocyanine dyes are assembled by multiple hydrogen bonds with summation of their dipole moments (see formula; R=2-ethylhexyl). It exhibits a strongly increased degree of dye alignment in an electric field according to electrooptical absorption spectroscopy.
The new and fast scatterometry method called optical diffraction microscopy is compared with atomic-force microscopy by use of cross-section scanning-electron microscope images as references. The sample is a high-aspect-ratio grating with a period of approximately 1000 nm. To allow the atomic-force microscope to track…
The deformed structure of silica-filled elastomers under uniaxial strain has been investigated using a combination of both small angle x-ray scattering and small angle neutron scattering methods. Using an extraction procedure and taking into account the two-phase nature of these polymer-based composites, the single ch…