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。
Abstract Sea urchin embryos form their calcitic spicular skeletons via a transient precursor phase composed of amorphous calcium carbonate (ACC). Transition of ACC to calcite in whole larvae and isolated spicules during development has been monitored using X‐ray absorption spectroscopy (XAS). Remarkably, the changing…
The synthesis of alkoxotitanium(IV) and -zirconium(IV) complexes of seven chelating tetradentate di- or trianionic amine-phenolate ligands belonging to three families and their application in L-lactide polymerization are described. The isopropoxotitanium complexes were synthesized by a direct reaction between the liga…
We study edges states of graphene ribbons in the quantized Hall regime, and show that they can be described within a continuum model (the Dirac equation) when appropriate boundary conditions are adopted. The two simplest terminations, zigzag and armchair edges, are studied in detail. For zigzag edges, we find that the…
We report that the local Debye-Waller factor in a simulated 2D glass-forming mixture exhibits significant spatial heterogeneities and that these short-time fluctuations provide an excellent predictor of the spatial distribution of the long-time dynamic propensities. In contrast, the potential energy per particle of th…
Since its original release, the popular crystal structure visualization program Mercury has undergone continuous further development. Comparisons between crystal structures are facilitated by the ability to display multiple structures simultaneously and to overlay them. Improvements have been made to many aspects of t…
Microspheres of amphiphilic triblock polymers PLLA-PEG-PLLA were investigated as carriers for heparin delivery. Two series of PLLA-PEG-PLLA triblock were synthesized and prepared into microspheres with heparin loaded. The microspheres were hollow and the surface morphology varied from smooth to porous. The pore size i…
The octahedron tilt transitions of $AB{X}_{3}$ perovskite-structure materials lead to antipolar arrangements of dipoles, with the low temperature $(T)$ structure having six sublattices polarized along various crystallographic directions. It is shown that an important mechanism driving the transition is long-range dipo…
Abstract The pentacyanochromate(II) complex is unusual in two respects. Firstly, it is one of the few homoleptic cyanide species with a high‐spin ground state. Secondly, it was synthesised during an attempt to make the hexacoordinate complex. A combination of qualitative ligand field theory and quantitative density fu…
The layered molybdate [M2(pzc)2(H2O)x][Mo5O16] (I: M = Ni, x = 5.0; II: M = Co, x = 4.0; pzc = pyrazinecarboxylate) hybrid solids were synthesized via hydrothermal reactions at 160-165 degrees C. The structures were determined by single-crystal X-ray diffraction data for I (Cc, Z = 4; a = 33.217(4) A, b = 5.6416(8) A,…
The success of semiconductor technology over the last few decades has clearly established the importance of photoresists in manufacture of these devices. While the fundamental focus of the development in the photoresists area has often been in obtaining smaller feature size(s) at reduced cost, the toxicity and the env…
We report the electronic transport properties of a composite system comprising zero dimensional superconducting NbC(C) nanocapsules and carbon nanofiber matrix. DC susceptibility measurements of the nanocomposite indicate that the critical temperature $({T}_{\mathrm{C}})$ of NbC nanocrystals is $10.7\phantom{\rule{0.3…
In this paper we report on the transport properties of hydrogenated amorphous carbon (a-C:H) which is an attractive material for strain gauges and can also be used in flow meters, accelerometers and vibrational sensors. The a-C:H films were deposited at −350 V bias voltage on silicon (Si) substrates using plasma assis…
We investigated the nature of the ground state and static response properties (mu, alpha, and beta) for a promising class of twisted pi-electron system nonlinear optical chromophores at the HF, B3LYP, MP2, and CASSCF levels. We report results for a substituted twisted ethylene and a larger tictoid analogue. Previous w…
We study the phonon dynamics of Fibonacci heterostructures where two kinds of order (namely, periodic and quasiperiodic) coexist in the same sample at different length scales. We derive analytical expressions describing the dispersion relation of finite Fibonacci superlattices in terms of nested Chebyshev polynomials…
Abstract Summary: The main objective of this work was to study the controlled degradation of PP in industrial extruders at different operating conditions. Firstly, the investigation of certain key polymer properties, such as the MI and the MWD, revealed that the changes undergone by the polymer resin during the reacti…
Water, methanol (MeOH), acetonitrile (ACN), and binary MeOH-water and ACN-water solutions of different spin probes (nitroxides), selected to mimic the behavior of different pollutants, were adsorbed onto stationary phases usually used in reversed-phase high-performance liquid chromatography (RP-HPLC). These stationary…
Single-crystal Mn3O4 nanorods with tetragonal structure have been successfully prepared by a chemical reaction route. Transmission electron microscopy (TEM) and high-resolution TEM studies prove that the single-crystal Mn3O4 nanorod is smooth and straight, and that the geometrical shape is structurally perfect. We inv…
The structure of a ⟨ 110 ⟩ 90° grain boundary in Au is investigated using high-resolution transmission electron microscopy (HRTEM) and atomistic simulation. It consists of coherent segments, exhibiting the extended 9R configuration described by Medlin et al. 10 Medlin, DL, Foiles, SM and Cohen, D. 2001. Acta mater., 4…
Picrophilus torridus has been shown to degrade glucose via a nonphosphorylative Entner-Doudoroff (ED) pathway. Here we report the characterization of a key enzyme of this pathway, glycerate kinase (2-phosphoglycerate forming). The enzyme was purified 5,100-fold to homogeneity. The 95 kDa homodimeric protein catalyzed…
Self-organization of nanoparticles into hierarchical assemblies is very important for the development of “bottom-up” approaches in nanotechnology. Porous silicon can be used as a substrate to prepare fractal-like magnetite nanoparticle assemblies, which add a new dimension to nanoscale spin electronics as each small p…