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。
Two new phloroglucinol glycosides, lysidisides A and B, and two new flavanol ramifycations, lysidicichin and mopanolside, together with (+)-mopanol, polydatin and E -resveratrol 3- O - β - D -xylopyranoside were isolated from the EtOAc extract of the roots of Lysidice rhodostega . The structures of the new compounds w…
Abstract Initial stages of the gel-to-kaolinite transformation were studied using HRTEM. Spherical aggregates of kaolinite crystals were produced during the synthesis of kaolinite by hydrothermal treatment of Si-Al amorphous gels. Prior to sphere formation, gels transform into pseudospherical domains that have a Si/Al…
CaTi 0.8 Fe 0.2 O 3–δ ceramics with grain sizes that varied from 2 to 10 μm were obtained and studied using SEM, TEM, Mössbauer spectroscopy, impedance spectroscopy, and electrochemical oxygen permeability measurements. Smaller grains developed a core–shell microstructure that consisted of a pure CaTiO 3 core and an i…
The initiation and propagation of adiabatic shear bands (ASBs) in functionally graded materials (FGMs) deformed at high strain rates in plane-strain tension have been studied. An ASB is a narrow region, usually a few micrometers wide, of intense plastic deformation that forms after softening of the material due to its…
The recently developed Hartree analysis for compressible diblock copolymers has been performed to study the thermodynamic origin of an immiscibility loop and its unprecedented pressure dependence observed in a diblock copolymer from polystyrene and poly( n -pentyl methacrylate). Certain specific interactions (SI) were…
This article revises, analyses, completes and summarizes the crystalline structure of all the Y2Si2O7 and Y2SiO5 polymorphs by combination of diffraction and crystallographic data with spectroscopic MAS-NMR data published up to now.
A new amine-modified hypercrosslinked polymeric resin, AH-6, for the removal of phenolic compounds from their aqueous solutions was prepared by introducing dimethylamine groups onto the matrix of the conventional hypercrosslinked polymeric adsorbent NDA100. The adsorption of four phenolic compounds, i.e. phenol, p-cre…
Core−shell colloids, particles covered with polyelectrolyte (PE) multilayer films and lipid bilayer membranes, were prepared through self-assembly processes. The PE multilayer films were fabricated by the layer-by-layer (LbL) assembly of poly(diallyldimethylammonium chloride) (PDDA) and poly(sodium 4-styrenesulfonate)…
n -Propylsulfonic acid-functionalized porous and nonporous silica materials are evaluated in the ring-opening polymerization of ε-caprolactone. All catalysts allow for the controlled polymerization of the monomer, producing polymers with controlled molecular weights and narrow polydispersities. Polymerization rates ar…
Ferroelectric Ba(Sn x Ti 1− x )O 3 (BTS) thin films were deposited using a sol–gel process on LaNiO 3 ‐coated silicon substrates. The films showed a (100) preferred orientation depending on composition. The grain size decreased and the microstructure became denser with increasing tin content. The decreasing grain size…
On the basis of hydrogen bonding, poly(vinylpyrrolidone) and poly(methacrylic acid) were layer-by-layer deposited on the surface of the AgCl microcrystals or SiO 2 colloidal particles in aqueous solution to construct core−shell structure particles. When the AgCl and SiO 2 cores were removed, the porous and nonporous n…
Molecular biology and genomic sciences are revealing the early biological signatures for many diseases. In response, the Molecular Imaging community is rapidly developing contrast agents to visualize the nascent pathological changes and to concomitantly deliver treatment directly to the site of disease. The evaluation…
The thermodynamic functions free energy, enthalpy, and entropy of solution, were evaluated from the solubility data of acetanilide, acetaminophen, and phenacetin, determined at several temperatures in water, octanol, isopropyl myristate, and chloroform. These three organic solvents mutually saturated with water, and f…
An economic method is presented to grow undoped/doped tungsten oxide nanowires with high purity and erect orientation, simply by heating a tungsten filament in a vacuum chamber with some room air leakage. Tungsten oxide nanowires were studied using scanning electron microscopy (SEM), energy dispersion x-ray spectrosco…
We present magneto-optical studies of intra-center absorption band related to neutral Mn acceptor in GaN bulk crystals. The band is built of a zero-phonon line at $1.4166\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ followed by GaN phonon spectrum. Magneto-optical experiments performed in magnetic fields up to $22\phantom{\…
To study the transport properties of individual helical polyacetylene (PA) fibers, we developed a method to extract a single fiber from tightly entangled ropes of helical PA bulk film. After a few minutes of sonication of a piece of helical PA bulk film in an organic solution containing surfactant, a droplet of soluti…
利用黏土矿物X射线衍射峰(XRD)拟合与分解的方法, 结合透射电子显微镜(TEM)和X射线能谱(EDX)分析, 发现在洛川黑木沟剖面黄土-古土壤序列(S<SUB>0</SUB>-L<SUB>10</SUB>)的黏土矿物中存在两种不同类型的伊利石, 一种是结晶度差、衍射峰宽且钝的伊利石, 其在<2µm的黏土矿物中的最高含量为55%; 另一种为结晶度好、衍射峰窄且锐的伊利石, 这两种伊利石的含量在剖面上呈明显的互补变化关系. X射线能谱分析表明, 与结晶度好的伊利石相比, 结晶度差的伊利石较富含K<SUP>+</SUP>, Si<SUP>4+</SUP>, 贫Al<SUP>3+</SUP>.
The crystal structure of La 0.67 Ca 0.33 Mn 0.80 Cu 0.20 O 3 (LCMCO) compound was determined from laboratory X-ray powder diffraction data and refined by the Rietveld method. LCMCO is isostructural with La 0.67 Ca 0.33 MnO 3 (LCMO). The crystal data are: La 0.64 Ca 0.36 Mn 0.82 Cu 0.18 O 3.01 , M r =843.80, orthorhomb…
Research Article| December 01, 2004 Rb-Sr Isotopic and elemental studies of the origin of glauconite in the Permian northern Karoo Coal Fields, South Africa: Evidence for a thermal Mid-Jurassic influence J. M. Barton, Jr.; J. M. Barton, Jr. Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park…
Using two hexagonal samples of ice, polycrystalline and single-crystalline, the electrical treeing has been investigated under an applied impulse voltage. The crystallinity and temperature of the ice play an important role in the events of the treeing. In the single-crystalline ice, the tree in the samples at -25 /spl…