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。
A Fréedericksz transition measurement is reported for a liquid crystal cell composed of surfactant-coated substrates. One substrate was locally scribed with the stylus of an atomic force microscope to create a nanoscopic grooved structure. The Fréedericksz threshold voltage was found to be smaller in the scribed regio…
A silver 4-tert-butylthiophenolate complex generated in situ reacted with CS2 in acetone to give an anionic cluster [Ag50S7(SC6H4But-4)40]4-, the core of which consists of fifty silver atoms and forty-seven sulfur atoms, shaped like a discus with a diameter of ca. 2.0 nm.
The radial dynamics of an acoustically driven single bubble, levitated in water, along with the sonoluminescence (SL) signal, were recorded in the absence and in the presence of micromolar quantities of different surfactants and polymers. It was observed that these nonvolatile solutes, in the low concentration range u…
Hydroxylation and dehydroxylation reactions at the surfaces of amorphous silica and Mg(OH) 2 have been studied by ab initio Car-Parrinello molecular dynamics simulations. A particular topological defect on the amorphous silica surface, the two-membered (2M) silicon ring, is shown to react fast with water thus confirmi…
A series of tetrahomodioxacalix[4]arene tetraamides and tetrathioamides with four p-phenyl groups on their upper rim were synthesized. From the (1)H and (13)C NMR and crystal structure, N-butylamido homooxacalix[4]arene (4) was found to be in the 1,3-alternate conformation and has intramolecular hydrogen bonding betwe…
We investigated the possibility of using several sensing parameters from porous silicon in order to improve gas selectivity. By fabricating porous silicon optical microcavities, three independent quantities can be measured, i.e. the electrical conductance, the photoluminescence intensity, and the wavelength of the opt…
We have used scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and X-ray photoelectron spectroscopy (XPS) to investigate the thermal stability of Pd(111) islands and thin films on TiO 2 (110)-(1 × 2). Two new nano-structures were observed to form on the surface of the Pd by annealing to 973…
We present parameter-free calculations of the frequency-dependent dielectric function in order to understand the optical properties of Ge and Si nanoparticles. The calculations are based upon the independent-particle approximation and a pseudopotential-plane-wave method. The nanoparticles are described by clusters of…
Outline of Crystallography for Biologists is intended for researchers and students in the biological sciences who require an insight into the methods of X-ray crystallography without needing to learn all the relevant theory. The main text is purely descriptive and is readable by those with minimal mathematical knowled…
Figure 1 3.4: Boron nitride phase diagram and equil ibrium domains for the cubic (c-BN) and graphitic (h-BN) forms, as deduced from the results of various authors. 13.4 DIAMOND AND CUBIC BORON NITRIDE: MATERIALS WITH EXCEPTIONAL PROPERTIES Table 13.4 summarises the main physico-chemical properties of diamond and c-BN.…
We have studied the island size distribution and spatial correlation function of an island growth model under the effect of an elastic interaction of the form $1/r^{3}$. The mass distribution $P_n(t)$ that was obtained presents a pronounced peak that widens with the increase of the total coverage of the system, $θ$. T…
Heat conduction in 1-dimensional anharmonic systems is anomalous in the sense that the conductivity κscales with a positive power of the system size, κ~ L^α. In two dimensions, previous simulations and theoretical arguments gave a logarithmic divergence. For rectangular systems of size L_\| x L_\perp there should be a…
Secondary ion mass spectrometry (SIMS) has been used in conjunction with isotopic labeling to determine the extent and rate of passive film hydration on aluminum. The rates at which oxygen- and hydrogen-containing species migrate through the film have been determined as a function of temperature and applied potential…
A new magnetic waveguide is described the operation of which is based on inductive coupling between resonant elements. The general form of the dispersion equation is shown. For a particular embodiment of the waveguide, consisting of 26 elements, the relative values of the currents are plotted and the travel of power f…
PART I: HOMOPOLYMERS. Polyesters: Synthesis and Chemical Aspects (E. Marechal).Industrial Scale Production of Polyesters, Especially Poly(ethylene terephthalate) (S. Aharoni). Crystal Structure, Morphology, and Orientation of Polyesters (P. Geil). Structure Formation in PET During the Induction Period of Crystallizati…
Molecular orientational order parameters have been obtained by Raman scattering in two types of liquid crystal materials showing the V-shaped switching in thin homogeneous cells. One is the Mitsui mixture and the other is one component of the Inui mixture. The antiferroelectric phase exists in the bulk of both materia…
The dielectric permittivity $\ensuremath{\varepsilon}={\ensuremath{\varepsilon}}_{1}\ensuremath{-}i{\ensuremath{\varepsilon}}_{2}$ of semiconducting ${\mathrm{CdF}}_{2}:\mathrm{In},$ ${\mathrm{CdF}}_{2}:\mathrm{Ga},$ and ${\mathrm{CdF}}_{2}:\mathrm{Y}$ crystals was studied over the frequency range from 34.0 to 37.5 GH…
The dielectric response of ${\mathrm{Gd}}_{0.6}{\mathrm{Y}}_{0.4}{\mathrm{BaCo}}_{2}{\mathrm{O}}_{5.5},$ which undergoes a sequence of magnetic and electronic phase transitions, has been investigated in the radio-frequency range from 1 MHz to 1.8 GHz in order to separate the intrinsic properties from grain boundary an…
Local electronic properties of quantum dot nanotubes modeled by connecting pure semiconducting and metallic nanotubes via appropriate junctions are studied following a single $\ensuremath{\pi}$-band tight-binding Hamiltonian. The junctions are formed by introducing pair defects composed of heptagons and pentagons alon…
We studied the assembly of dithiacrown ether styryl dye (CSD) molecules in crystals, solutions, and films in the presence of metal cations. X-Ray diffraction data allowed us to conclude that the anion affects the supramolecular architecture of CSDs in the crystal, specifically, the type of stacking of the dye molecule…