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。
We report on density-functional-based tight-binding (DFTB) simulations of a series of amorphous arsenic sulfide models. In addition to the charged coordination defects previously proposed to exist in chalcogenide glasses, a novel defect pair, [As4]--[S3]+, consisting of a four-fold coordinated arsenic site in a seesaw…
Aqueous solutions of europium(III) and terbium(III) tris(dipicolinates), around physiological pH are shown to be convenient secondary standards in the determination of quantum yields of lanthanide complexes containing these ions. Conditions for which a strict linearity is observed between the concentration of the solu…
Self-generation of ionic organic capping from nonionic surfactant polyoxyethylene (20) sorbitan trioleate (Tween-85) has been realized for the controlled synthesis of single crystalline Co(3)O(4) quantum dots (3.0-5.7 nm) in cubic morphology from related layered hydroxide precursors at 80-95 degrees C. With chemical m…
The central-zone vibrational spectrum of alpha-quartz (SiO2) is calculated by building the Hessian matrix numerically from the analytical gradients of the energy with respect to the atomic coordinates. The nonanalytical part is obtained with a finite field supercell approach for the high-frequency dielectric constant…
The highly crowded arylbis(9-anthryl)methyl cations (structure shown) have now been prepared. Their stability is due to the doubly benzo-annelated structure of anthracene, which prevents Nazarov-type cyclization from taking place. The most remarkable feature of these cations is that they exhibit strong absorptions in…
Schön verpackt: Biomoleküle können in die ultradünne Schale eines Aminopropyl-funktionalisierten Magnesium(organo)phyllosilicats eingehüllt werden und ergeben so wässrige Dispersionen einzelner Nanopartikel aus Protein- und anorganischem Material (A). Ähnliche Methoden führen mithilfe von Tonerde-Oligomeren mit langke…
Remote electron beam induced current (REBIC) and cathodoluminescence (CL) modes in the scanning electron microscope (SEM) have been used to investigate SnO2 sintered samples. The study of the electrically active boundaries present in the oxide shows a characteristic peak and trough (PAT) contrast after thermal treatme…
${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ undergoes an order-disorder phase transition associated with the orientational disordering of the ${\mathrm{WO}}_{4}$ tetrahedra at $440\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. We have showed previously that the phase transition temperatures of ${\mathrm{Zr}}_{1\ensuremath{-}x}{M}_{…
We previously proposed the use of solution stirring during the growth of protein crystals using the Micro-Stirring technique with a rotary shaker. In this paper, we report on the effects of a new type solution flow on the crystallization of hen egg-white lysozyme (HEWL) using a wave shaker. The time required for nucle…
A strong antibonding π interaction has been shown by density functional calculations (see LUMO MO graph) to be a key characteristic of two new CuI–diazene complexes with hydrotris(pyrazolyl)borate ligands. The complexes have been further characterized by X-ray crystallography as well as 1H NMR, UV/Vis absorption, IR,…
The insertion of a triethoxysilylated coumarin dye into the channels of zeolite L from CH 2 Cl 2 was examined. Fluorescence from the dye was observed only at the base planes of the cylindrical zeolite L crystals, indicating selective modification of the channel entrances. Leaching of the dye was observed when the mate…
Disorder in ${\mathrm{Gd}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ is investigated by near-edge x-ray-absorption fine structure (NEXAFS) and x-ray photoelectron spectroscopy (XPS). NEXAFS shows ${\mathrm{Ti}}^{4+}$ ions occupy octahedral sites with a tetragonal distortion induced by vacant oxygen sites. $\mathrm{O}\phan…
The present paper deals with the formation and detailed characterization of the γ-cyclodextrin (γ-CD) inclusion compounds (ICs) formed with two different high molecular weight isotactic polyolefins, i.e., polypropylene (i-PP) and poly(butene-1) (i-PB). Wide-angle X-ray diffraction (WAXD), differential scanning calorim…
doi:10.1088/0022-3727/37/19/005 We report on the magnetic and martensitic transformation properties of Co39Ni33Al28 ferromagnetic shape memory alloy ribbons. We found that the phase formation of Co39Ni33Al28 is strongly dependent on the method of preparation. The conventional as-cast ingot sample contains a large amou…
Surface-enhanced Raman scattering (SERS) of 4-nitrothioanisole (4-NTA) is investigated in Ag sol. The molecule is found to adsorb on Ag as 4-NTA via the sulfur atom. Upon irradiation by an argon ion laser at 514.5 nm, the molecule is, however, subjected to two consecutive surface-induced photoreactions, namely C−S bon…
MTT (Tetrazolium)-assay suggests that diamond-like carbon (DLC) and silicon-doped DLC (Si-DLC) films obtained under appropriate deposition parameters are not toxic to bovine retinal pericytes, and human microvascular endothelial cells (HMEC). The observed frequency distributions of the optical density (OD) values indi…
Divalent europium doped strontium di-aluminate (SrAl 4 O 7 : Eu 2+ ) nanocrystals have been synthesized using a facile sol–gel polymer thermolysis method. The photoluminescence characteristics of smaller particles (ϕ ∼ 15 nm) show a significant difference with respect to their bulk counterpart. In this nanocrystalline…
Abstract Although recent years have witnessed an impressive confluence of experiments and kinetic and statistical theories, presently there is no comprehensive understanding of the interrelation between chemical sequences in synthetic copolymers and the conditions of synthesis. For this problem, numerical simulations…
In this article, we demonstrate how a combination of engineering and biological techniques could lead to the realization of branched microstructures that can be used for the repair of damaged vascularized tissue. Recursive "treelike" networks were first generated by using fractal algorithms based on Murray's equation…
Multi-wall nanotubes (MWNTs) of carbon were produced by pulsed arc discharges between a room temperature sample and a counter-electrode, with peak currents of 7–100 A, and pulse lengths of 0.2–26 µs, in open air at selected locations on the sample. The samples were 10 × 10 mm 2 graphite plates, carbon-coated 200 mesh…