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。
The lattice dynamics of yttrium manganite (YMnO(3)) has been investigated by means of a shell model with pair-wise interionic interaction potential. The experimental data of crystal structure and Raman and infrared frequencies compare well with the lattice dynamical calculations. The phonon dispersion curves found alo…
Abstract BACKGROUND: The increasing uses of non‐woven fabrics need the development of a kind of novel flame‐retardant polyester with low melting temperature. Neopentyl glycol (NPG) and 3‐(hydroxyphenylphosphinyl)propionic acid (HPPPA) were used as the third and fourth comonomer to synthesize phosphorus‐containing poly…
Structure, optical, and magnetic properties of the anatase Ti1−xFexO2−δ films fabricated by facing-target reactive sputtering were investigated. Structural analyses indicate that there are no impurity phases in the films and the grain size reaches maximum when Fe content x is 0.017. The optical band gap of the Ti1−xFe…
The catalytic activity of silica gel and silica gel—supported nickel (2, 5, and 8 wt% Ni) and γ-alumina—supported platinum (0.3 and 0.6 wt% Pt) was studied for n-hexane or n-pentane cracking and cyclohexane dehydrogenation adopting pulse technique. The results showed that Pt/γ-alumina could be a selective catalyst for…
There are three main effects that affect the femtosecond pulse focusing process near the focal plane of a refractive lens: the group velocity dispersion (GVD), the propagation time difference (PTD), and the aberrations of the lens. In this paper we study in detail these effects generated by nonideal achromatic doublet…
A new class of carbon structure is reported, which consists of microscale graphitic shells bounded by curved and faceted planes containing two to five layers. These structures were originally found in a commercial graphite produced by the Acheson process, followed by a purification treatment. The particles, which coul…
We have performed extended x-ray absorption fine-structure (EXAFS) spectroscopy on a 2.8% Cr-doped V(2)O(3) sample, with the aim of studying its structural evolution in a wide temperature range across the paramagnetic-antiferromagnetic insulating phase transition at T(c). The data were registered with two different se…
Semiconducting Pr0.6Ca0.4MnO3 nanoparticles with width of ∼50nm and length ∼80–150nm were prepared by sol-gel method. The dielectric behavior of Pr0.6Ca0.4MnO3, polyvinylidene fluoride composites was investigated by varying the Pr0.6Ca0.4MnO3 volume fraction and frequency. The percolation threshold of the composites w…
Epitaxial single-crystal Ge1−xMnx ferromagnetic-semiconductor films were fabricated on Ge(001) substrates by molecular beam epitaxy. All the samples are ferromagnetic and have strong magnetic anisotropy indicated by different magnetization in plane and out of plane. The electrical transport of the films obeys Efros va…
A series of poly(9,9-dihexylfluorene-2,7-diyl- co -9,9-dihexylfluorene-3,6-diyl) copolymers of varying composition were synthesized by Suzuki polymerization. Their composition and properties were determined by NMR, UV−vis, and fluorescence spectroscopy and cyclic voltammetry. The incorporation of 3,6-fluorene units gi…
Abstract Some of the diarylethene derivatives were found to undergo photoisomerization reactions between two isomers even in the single-crystalline phase. The two isomers have different electronic as well as geometrical structures. The electronic structure change induces the reversible color change of the crystal. Sin…
We present a simple technique to fabricate rubber-toughened biopolymer/organoclay nanocomposite coatings with highly water repellent surface wetting characteristics and strong adhesion to metal surfaces. The technique combines the principles of phase inversion and atomization of multicomponent polymer/organoclay suspe…
The interaction of D 2 O with a thick BaO film (≥20 monolayer equivalent (MLE)) on ultrathin Al 2 O 3 /NiAl(110) was investigated with temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). Upon D 2 O exposure of a thick BaO film, amorphous barium hydroxide formed at room tempe…
Interfacial water layers attract more and more attention in both material sciences and life sciences because of two characteristics that depend on the polarity of the surfaces involved: crystalline order and surface stability. Their interplay allows us to understand friction at the nanoscale under realistic conditions…
The present paper reports the synthesis of cuprous oxide particles through pathological route by using glucose solution as reducing agent in Benedict qualitative reagent. The synthesized material has been investigated by scanning electron microscopy (SEM) and x-ray diffraction studies. SEM shows uniform distribution o…
Lepidopteran wing scales and Drosophila bristles are considered homologous structures on the basis of the similarities in their cell lineages. However, the molecular mechanisms underlying scale development are essentially unknown as analysis of gene function in Lepidoptera is sorely limited. In this study, we used the…
Surface characteristics of the prepared nickel catalysts containing 7, 10, and 13 wt% Ni w/w over different supports—silica gel, γ-alumina, and aluminosilicate—were investigated. Surface areas, total pore volumes, and average pore radii were determined for all catalysts. Pore analysis was discussed based on Vl-t plots…
Adsorption and its dynamical process of polymer mixtures consisting of long and short alkane molecules around a carbon nanotube (CNT) are studied with molecular-dynamics (MD) simulations and master equation. Preferred adsorption is found for long chained molecules compared to short ones, due to favorable interfacial i…
We investigated cluster formation in model colloids where the interparticle potential beyond the collision diameter includes a short-ranged attraction and a longer-ranged repulsion. The structure and thermodynamic properties of the model system can be accurately described by the first-order mean-spherical approximatio…
A one-step process to form carbon nanotubes coated with cobalt oxide nanoparticles, using spray pyrolysis of cobalt(II) acetylacetonate−xylene solutions, has been developed. Both microstructure and chemical composition of carbon nanotubes covered with cobalt oxide nanoparticles depend on the concentration of the Co(ac…