Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
A recently developed new liquid crystal display, which operates in the fringe-field switching mode, is known to exhibit high transmittance as well as a wide viewing angle unlike the conventional in-plane switching (IPS) mode display. The device shows unique electro-optic behavior, nevertheless the liquid crystal direc…
The superexchange interaction in cyano-bridged transition metal dimers is analysed by a valence bond configuration interaction model in combination with fourth order perturbation theory. Ferro- and antiferromagnetic contributions to the exchange splitting are expressed in terms of metal-ligand hybridization matrix ele…
This paper presents photoreaction of methacrylate polymer films comprising a 2-cinnamoyloxyethoxybiphenyl mesogenic side group by a linearly polarized (LP) ultraviolet (UV) light and an alignment behavior of liquid crystal (LC) on the resultant films. The effect of methylene spacer length between the polymer backbone…
O emprego potencial de filmes comestíveis e biodegradáveis em embalagens é condicionado pelas suas propriedades funcionais, que são influenciadas por muitos fatores, inclusive pela espessura. O objetivo deste trabalho foi estudar a influência da espessura dos biofilmes feitos à base de proteínas miofibrilares (de carn…
The 57 Fe spin echo spectra were studied in local magnetic fields of a BiFeO 3 ferroelectric antiferromagnet over the temperature range 77–304 K. The line shape analysis confirmed the presence of a spatially modulated, incommensurate cycloidal spin structure in BiFeO 3 and allowed the actual spin distribution to be re…
We hypothesize that the fracture resistance of alumina core/porcelain veneer disks increases and that crack initiation shifts from veneer to core as the core/veneer thickness ratio (t(C)/t(V)) increases from 0.5/1.0 to 1.3/0.2, or as the elastic modulus of the supporting substrate (E(S)) to which it is resin-bonded in…
The sound scattering of free microbubbles released from strongly driven ultrasound contrast agents with brittle shell (e.g., Sonovist) is studied numerically. At high peak pressure of the driving pulses, the bubbles respond nonlinearly with cross sections pronouncedly larger than in the linear case; a large portion of…
Effective systems for the catalytic oxygenation of hydrocarbons have been developed based on metalloporphyrins containing iron, manganese and ruthenium. These metalloporphyrin catalysts were inspired by studies of the mechanism of the heme oxygenase cytochrome P450 and related enzymes. Oxometalloporphyrins, which have…
Abstract A new segmented flow tubular reactor for the continuous production of powders was used to synthesize calcium carbonate by precipitation. This new reactor uses a nonmiscible phase (air in most cases) to create individual microvolumes of the reacting mixture or suspension ensuring that a plug‐flow regime is mai…
Alloys based on Ge clathrates are promising thermoelectric materials because of their expected “rattling” properties. We have incorporated the elements of columns I and II into the cages of (Ge, Ga)46 type-I clathrates as cation guests and have theoretically examined their “rattling” behavior using density functional…
Wide-angle x-ray scattering (WAXS) has been used to investigate the structure of complex sodium (alumino) borosilicate glasses containing four, five, and six oxides. WAXS data were compared with previous molecular dynamics calculations on these glasses. Small differences were observed which are mainly due to a smaller…
A new type of thin-film polarizing beam splitter (PBS) is proposed that is based on the effects of light interference and frustrated total internal reflection. This PBS has a significantly better performance than conventional thin-film PBS's. It is nonabsorbing, broadband, and wide angle and has high extinction ratios…
The crystal structures of dilithium, disodium and diammonium terephthalate (1,4-benzenedicarboxylate) have been solved ab initio using Monte Carlo simulated annealing techniques, and refined using synchrotron powder data. The structures of dipotassium terephthalate, potassium hydrogen terephthalate and ammonium hydrog…
Abstract. Volcanic ash soils are generally recognized as soils with excellent and stable physical properties. Here we characterized the porosity and water properties of volcanic ash Andosols and Nitisols from Guadeloupe in contrasting banana systems: (1) perennial crop without mechanization, (2) mechanized and regular…
We present a theory of the melting of elements as a dislocation-mediated phase transition. We model dislocations near the melt as noninteracting closed loops on a lattice. In this framework we derive simple expressions for the melting temperature and latent heat of fusion that depend on the dislocation density at melt…
Metastable tetragonal ZrO 2 phase has been observed in ZrO 2 –SiO 2 binary oxides prepared by the sol–gel method. There are many studies concerning the causes of ZrO 2 tetragonal stabilization in binary oxides such as Y 3 O 2 –ZrO 2 , MgO–ZrO 2 , or CaO–ZrO 2 . In these binary oxides, oxygen vacancies cause changes or…
The viability of conjugated polymer thin film electrooptical devices and sensors depends strongly on high quantum efficiency thin films with excellent charge and exciton mobilities.1,2 The brightness of electroluminescent devices depends on the charge transport and emission efficiency, and energy migration to low ener…
Several recent studies of phthalocyanines and porphyrins as materials in emerging technologies are reviewed here. Emphasis is placed on the use of these materials as components in building materials where the symmetry, optical and electrical properties of the molecule are important. Aggregates or polymers of these mol…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSupramolecular Self-Assembly of Three-Dimensional Nanostructures and Microstructures: Microcapsules from Electroactive and Photoactive Rod−Coil−Rod Triblock CopolymersX. Linda Chen and Samson A. JenekheView Author Information Depart…
Recent progress in antimicrobial dendrimers is reviewed. Both specific interactions and non-specific interactions can be utilized to design multifunctional (polyvalent) antimicrobial agents, which might be more potent than their mono-functional counterparts. Dendrimers or hyperbranched polymers can also be used to des…