Materials Literature
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The piezoelectric properties of a Pb[(Mg 1/3 Nb 2/3 ) 0.68 ]Ti 0.32 O 3 [PMNT(68/32)]binary system single crystal oriented along the [001] direction in the rhombohedral phase was investigated under pressures up to 400 MPa at 25°C. The electromechanical coupling coefficient k 31 in the k 31 mode decreased markedly with…
Abstract Co‐precipitation reaction soft chemistry method was employed to prepare fine YPO 4 :Eu 3+ phosphor particles calcined at different temperature. Adjusting appropriate pH and introducing lithium may greatly affect the particle size of the sample and further affect the luminescence intensity. The as‐prepared sam…
Based on the displacement potential functions, the elastic analysis of a mode II crack in an icosahedral quasicrystal is performed by using the Fourier transform and dual integral equation theory. By the solution, the analytic expressions for the displacement field and stress field are obtained. The asymptotic behavio…
Abstract The carbocationic copolymerization of isobutylene (IB) and styrene (St), initiated by 2‐chloro‐2,4,4‐trimethylpentane/TiCl 4 in 60/40 (v/v) methyl chloride/hexane at −90 °C, was investigated. At a low total concentration (0.5 mol/L), slow initiation and rapid monomer conversion were observed. At a high total…
We propose an algorithm for correcting deposition termination levels that allows elimination of the cumulative effect of errors in previously deposited layers. For the application of this algorithm at least one monitoring signal extremum should be registered during a layer deposition. We also derive a theoretical rela…
Optically active polyaniline–carbon-nanotube nanocomposites are synthesized by using a solution-chemistry method. The stereochemical selectivity of the composites can be tailored by controlling the nanotube loading. At low nanotube contents (<3 wt %), the chiral composites show high absolute stereochemical selectivity…
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…