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 crystal and magnetic structures of the two related phases, Sr2MnGaO5 and Ca2MnAlO5 are reported. Rietveld analysis of neutron powder diffraction has revealed that both phases adopt the brownmillerite structure. Subtle differences in structure lead to the structure of Sr2MnGaO5 being best described by the space gro…
Abstract The solubility of 1‐hexene was measured for linear low‐density polyethylenes (LLDPEs) produced over a heterogeneous Ziegler–Natta catalyst, Mg(OEt) 2 /DIBP/TiCl 4 –TEA (ZN), and over a homogeneous metallocene catalyst, (2‐MeInd) z ZrCl 2 –MAO (MT). The 1‐hexene solubility in LLDPEs was well represented by the…
Abstract The synthesis of liquid single crystal hydrogels (“LSCH”) in suitable molds offers an innovative concept to realize bifocal contact‐ or intraocular‐lenses. LSCH combine the properties required for applications as bifocal ophthalmic lenses: the soft and water‐containing hydrogel enables oxygen permeation and e…
The lustrin superfamily represents a unique group of biomineralization proteins localized between layered aragonite mineral plates (i.e., nacre layer) in mollusk shell. Recent atomic force microscopy (AFM) pulling studies have demonstrated that the lustrin-containing organic nacre layer in the abalone, Haliotis rufesc…
Abstract Polyurethane dispersion and urethane/acrylate composite latex were synthesized and characterized by using a particle size analyzer, gel permeation chromatograph (GPC), Fourier transform infrared spectroscopy coupled with attenuated total reflectance (FTIR‐ATR), dynamic mechanical analysis (DMA), and instron t…
Using IR reflectance spectroscopy and surface polariton spectroscopy in the reststrahlen region, we investigated Czochralski-grown MgAl 2 O 4 spinel. The computer analysis of variance made for spectra enabled us to get a mathematical model for reflection spectra of spinel. In our calculations we used consistent data f…
A hybrid polymer as a near-stoichiometric SiC precursor was prepared by simply blending polycarbosilane (PCS) as a carbon-rich SiC precursor and polyborazine-modified polymethylsilane (M-PMS) as a silicon-rich SiC precursor at an optimized ratio of 0.25∶1.00 (PCS∶M-PMS) by weight. The hybrid precursor showed a very hi…
Lead titanate zirconate Pb(Zr,Ti)O 3 (PZT) thin films were deposited on platinized silicon substrates by r.f. magnetron sputtering and crystallized with preferred (110) or (111) orientation by conventional annealing treatment. The film structure evolution was observed as a function of the film thickness. Whatever the…
Novel inorganic−organic hybrid compound [H2V10O28](H4tmbim)2(H2O)4 has been synthesized and characterized. All three species, decavanadate anions, biimidazolium dications, and water molecules, are hydrogen-bonded to afford a layered structure. Water molecules are intercalated between the layers to extend a three-dimen…
L-Valine containing cyclophanes have been shown to gelate organic solvents leading to soft materials with a clear expression of their chirality at the supramolecular level.
Surface-enhanced resonance Raman scattering (SERRS) of a model derivative of TNT was detected using a microflow cell designed within the framework of the lab-on-a-chip concept, using only the analyte and readily available reagents. The SERRS substrate, silver colloid, was prepared in situ, on-chip, by borohydride redu…
The development of dendrimer chemistry has seen the realisation of a diverse range of architecturally fascinating macromolecules that have received extensive attention in the literature. Perhaps the most synthetically challenging hyperbranched polymers are chiral dendrimers and this review describes notable examples i…
The solid-state (13)C CP-MAS NMR spectra of biosynthetically labeled [(13)C(alpha)]Tyr, [(13)C(beta)]Tyr, and [(13)C(alpha)]Val silk fibroin samples of Bombyx mori, in silk I (the solid-state structure before spinning) and silk II (the solid-state structure after spinning) forms, have been examined to gain insight int…
Transient gelation in colloid-polymer mixtures is an interesting but poorly understood non-equilibrium phenomenon which has recently attracted the attention of experiment and theory. In a transient gel the particles aggregate, by the depletion interaction, to form a space-spanning network which maintains its structura…
Amyloid fibrils are associated with a variety of neurodegenerative maladies including Alzheimer's disease and the prion diseases. The structures of amyloid fibrils are composed of beta-strands oriented orthogonal to the fibril axis ("cross beta" structure). We previously reported the design and characterization of a c…
The robustness of the self-organized critical (SOC) state observed in the motion of an annular plate rotating over a granular medium is studied in this paper. In particular, we investigate the effect of parameters to which the emergent SOC state may be sensitive, including the initialization scheme, driving velocity,…
We show that the method of factorizing the evolution operator to fourth order with purely positive coefficients, in conjunction with Suzuki's method of implementing time-ordering of operators, produces a new class of powerful algorithms for solving the Schroedinger equation with time-dependent potentials. When applied…
This work studies the influence of microstructures and crystalline defects on the superconductivity of MgB2, with the objective to improve its flux pinning. A MgB2 sample pellet that was hot isostatic pressed (HIPed) was found to have significantly increased critical current density (Jc) at high fields than its un-HIP…
Calculations of L-shell x-ray absorption in transition metals are shown to be sensitive to screening, both of the x-ray field and the photoelectron-core hole interaction. This screening is calculated using a generalization of the time dependent local density approximation and a projection onto a local atomic basis. Th…
Glycerol is oxidised to glyceric acid with 100% selectivity using either 1% Au/charcoal or 1% Au/graphite catalyst under mild reaction conditions (60 degrees C, 3 h, water as solvent).