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 have studied ultrasonic wave propagation in two-dimensional quasiperiodic steel/water heterostructures with 8-, 10-, 12-, and 14-fold Patterson symmetry. The formation of band gaps in this kind of quasiperiodic phononic crystal (QPNC) is mainly governed by multiple Bragg scattering. The particular role of the perio…
Abstract We study the thickness dependence of the resonances of split‐ring resonators (SRRs) in the optical regime using experiments and numerical simulations. It is shown that the so‐called LC resonance frequency of an SRR increases with its thickness. We use inductor–capacitor ( LC ) circuits and a plasmonic model t…
Summary On Faial and Pico islands (Azores), we studied two profiles on basaltic pyroclasts that contain buried horizons, and we focussed on petrography, micropedology and mineralogy. Emphasis was given to weathering of the lapilli and ashes, and the neoformation of allophane. A combination of optical studies, in situ…
DFT calculations have been performed on a palladium cluster adsorbed on two different carbonaceous supports, namely, two stacked polycircumcoronene units mimicking a double layer of graphite and a portion of an armchair (6,6) carbon nanotube. All of the systems have been subjected to geometry optimization and electron…
In this paper, the results of experiments conducted to investigate the friction coefficient existing at a brass-steel interface are presented. The research discussed here is the second of a two-part study on the size effects in friction conditions that exist during microextrusion. In the regime of dimensions of the or…
Additives are one of the most influential factors that can affect the polymorphism and solvation state and the morphology of the crystals during crystallization. In this work, the effects of five different additives, sodium lauryl sulfate (SLS), polyethylene glycol 6000 (PEG), hydroxypropyl methylcellulose (HPMC), pol…
Abstract By studying metamaterials at low frequency, where wavelengths are much larger than the unit cell, the requirements of homogenization and the effective medium approximation can be easily met. The Swiss Roll medium is well‐suited to the RF frequency range, and here we review its behaviour, both as a one‐dimensi…
In situ and time-resolved simultaneous analysis by two different and complementary techniques, Fourier transform infrared spectroscopy (FTIR) and small-angle X-ray scattering (SAXS), has been developed. A conventional source for the infrared light and synchrotron radiation for the X-ray beam have been used. The new te…
XPS core level measurements are used to observe the surface changes in amorphous thin films of mixed oxides In 2 O 3 – SnO 2 system deposited by co-evaporation. The effects of changes in composition (in mol%), film thickness, substrate temperature, post-deposition annealing, and etching with Ar + ions on the binding e…
The properties of polystyrene blends containing deuteriopolystyrene, multiply end-functionalized with C8F17 fluorocarbon groups, are strikingly analogous to those of surfactants in solution. These materials, denoted FxdPSy, where x is the number of fluorocarbon groups and y is the molecular weight of the dPS chain in…
Recently, multiwalled N-doped carbon nanotubes were decorated with Ag nanoparticles (NPs) by a simple procedure. Now, as a continuation of our earlier work, Ag NP−graphite and Ag NP−molybdenite composites were prepared with this easy, fast, and inexpensive method. Graphite or molybdenite (MoS 2 ) powder was suspended…
In situ copolyesters containing polylactide (PLA) and polyhydroxyalkanoate (PHA) segments were obtained via ring-opening polymerization of L-lactide using PHA as a macroinitiator with stannous octoate as catalyst. Incorporation of PHA (20 wt %) into PLA affords a novel copolymer with Mn values ranging from 25 to 50 KD…
For the seeding process of the Czochralski crystal growth of sapphire, the flow and temperature field with a nonflat melt−gas interface have been studied numerically using the finite element method. The configuration usually used initially in a real Czochralski crystal growth process consists of a crucible, active aft…
Temperature dependences of the static dielectric permittivity and its derivative, obtained for isotropic mesogenic liquids composed of the molecules of different polarity in relation to the basic thermodynamic quantities (internal energy, entropy, and Helmholtz free energy), are analyzed. A role of the molecular polar…
Abstract Novel poly(ester carbonate)s were synthesized by the ring‐opening polymerization of L ‐lactide and functionalized carbonate monomer 9‐phenyl‐2,4,8,10‐tetraoxaspiro[5,5]undecan‐3‐one derived from pentaerythritol with diethyl zinc as an initiator. 1 H NMR analysis revealed that the carbonate content in the copo…
Abstract A photo‐ and proton‐dual‐responsive fluorescence switch based on a bisthienylethene‐naphthalimide dimer was described. Security data storage based on this dual‐responsive fluorescent molecular switch was proposed and demonstrated. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
In order to understand the mechanism of the structural phase transition in CH 3 NH 3 PbBr 3 , neutron diffraction data from the single crystal is analyzed by the least-squares method and the maximum entropy method. The disordered configuration of a methylammonium ion in a cage surrounded by eight PbBr 6 octahedrons is…
The magnetic exchange energies in charge ordered ${\mathrm{La}}_{1/3}{\mathrm{Sr}}_{2/3}{\mathrm{FeO}}_{3\mathrm{\text{\ensuremath{-}}}\ensuremath{\delta}}$ (LSFO) and its parent compound ${\mathrm{LaFeO}}_{3}$ (LFO) have been determined by inelastic neutron scattering. In LSFO, the measured ratio of ferromagnetic exc…
Intermolecular forces between two interacting nanostructures can be obtained by either summing over all the individual atomic interactions or by using a continuum or continuous approach, where the number of atoms situated at discrete locations is averaged over the surface of each molecule. This paper aims to undertake…
Abstract We investigate numerically the electric and the magnetic response of the split‐ring resonators (SRRs) for different electromagnetic (EM) field polarization and propagation directions. We have studied the current density J of circular and rectangular SRRs at THz frequencies. At low frequencies, J is confined t…