Materials Literature
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[structure: see text] Photoinduced electron transfer was observed for the snowflake-shaped dendrimer with the Zn porphyrin core and anthraquinonyl terminals. Comparison of the electron-transfer efficiency of the dendrimer with the linear analogues indicates the advantage of the dendritic structure for the electron-tra…
Abstract The propagation and radiation properties of dual composite right/left‐handed (D‐CRLH) transmission line metamaterials are presented, and validated experimentally with a 1D microstrip prototype. In its fast‐wave regime, this structure operates as a leaky‐wave antenna capable of backfire‐to‐endfire radiation sc…
This paper reports on a novel instrument for measuring the water transport behaviour of fabric or paper materials in the transplanar direction. The instrument is unique in that it can not only measure the initial water absorption of the fabric in the transplanar direction, but also the rate of evaporation from the fab…
Density-functional theory is used to assess the validity of modeling metal clusters as single atoms or rings of atoms when determining adhesion strengths between clusters and single-walled carbon nanotubes (SWNTs). Representing a cluster by a single atom or ring gives the correct trends in SWNT-cluster adhesion streng…
Dielectric permittivity of 0.8PMN-0.2PSN ceramic was measured in the frequency range from 20 Hz to 3 GHz. The typical ferroelectrics relaxor dielectric dispersion was observed. From the frequency dependence of complex dielectric permittivity, the distribution of relaxation times was calculated. The low frequency limit…
Mixtures of NaSCN−montmorillonite (MMT) and the electrolytes of both poly(ethylene oxide) (PEO)−MMT and PEO−NaSCN−MMT were prepared, and the MMT interfacial effect and the interactions of PEO with MMT and NaSCN were investigated by FT-IR and X-ray diffraction measurements at room temperature. It is shown from these ex…
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…