Materials Literature
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Electrical conductivity measurements on La0.5Sr0.5MnO3 (LSM5) thin films as a function of temperature are presented. These are used to demonstrate that the electronic transport in LSM5 is well described by the Emin–Holstein adiabatic small polaron model. Measurements have also been performed on bulk samples. Even if t…
On the basis of the density functional theory, we study pressure and orientation effects on geometric and electronic structures of crystalline bundles consisting of single-wall carbon nanotubes, (6,0), (8,0), (6,6), and (12,0). We find that mutual orientation angles of adjacent nanotubes in stable geometries correspon…
The texturing of the bottom electrode plays a key role in the structure and electrical properties of Pb(Zr, Ti)O3 (PZT) thin films. We fabricated Pt bottom electrodes having a different thickness on MgO single crystals at 600 °C by rf magnetron sputtering. As the thickness of platinum (Pt) thin film increased, the pre…
Abstract The ultrasonically initiated emulsion polymerization of methyl methacrylate (MMA) was investigated. Experimental results show that sodium dodecyl sulfonate (SDS) surfactant plays a very important role in obtaining a high polymer yield, because in the absence of SDS, monomer conversion is near zero. Thus, the…
Abstract The polyurethane acrylate (PU‐A) containing double bond and COOH group was synthesized by stepwise reaction of 2,4‐toluene diisocyanate (TDI), polyetherdiol (PPG), dimethylolpropionic acid (DMPA), and 2‐hydroxpropyl acrylate (HPA), and the PU‐A was neutralized with triethylamine (TEA) and self‐emulsified in w…
The Hume-Rothery matching rule has been widely used for many years as a practically useful guide to search for new quasicrystals and their approximants. In this work, we have performed the linear muffin-tin orbital atomic-sphere approximation band calculations for the nearly-free-electron-like ${\mathrm{Al}}_{30}{\mat…
The nutritionally versatile Pseudomonas putida has showed to grow in olive oil waste water called "alpechín", which is toxic for many other microorganisms. The transformation with the plasmid pSK2665, harboring Alcaligenes eutrophus genes needed for synthesis of poly (3-hidroxybutyric acid), allow Pseudomona…
Abstract The premelting behavior of bacterially synthesized polyester poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyhexanoate), abbreviated as P(HB‐ co ‐HHx), was investigated by two‐dimensional Fourier‐transform infrared (2D FTIR) correlation spectroscopy. The temperature‐dependent dynamic spectra were measured over a tempera…
A self-calibrating quantum efficiency measurement technique is applied to the Tm3+ H43→F43 transition at 1460 nm. The method requires only relative fluorescence measurements to determine the absolute quantum efficiency. Overlapping spectral features are separated using phase-shifted fluorescence from different levels…
Poly(ethylene oxide) (PEO) chains have been grafted onto a thermally sensitive poly( N -isopropylacrylamide) (PNIPAM) spherical microgel to form a novel quasi-planar polymer brush. The shrinking of the microgel at temperatures higher than 32 °C dramatically reduces its surface area, providing a convenient way to vary…
Synapse formation is a crucial step in the development of neuronal circuits and requires precise coordination of presynaptic and postsynaptic activities. However, molecular mechanisms that control the formation of functionally mature synaptic contacts, in particular between central neurons, remain poorly understood. T…
We construct an effective Hamiltonian for the motion of electrons among the transition-metal ions of ordered double perovskites like ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6},$ in which strong intra-atomic Coulomb repulsion U is present in only one of the inequivalent transition metal sites. Using a slave-boson formalism…
A phenolic polysiloxane, poly(4-ethenylphenolmethylsiloxane) (PEPS), that contains the phenolic hydroxyl group as a hydrogen-bond donor has been synthesized via hydrosilylation followed by hydrolysis. It was blended with a number of hydrogen-bond acceptors of different strengths, including poly(4-vinylpyridine) (PVPy)…
The dielectric relaxation spectra of ice V has been studied over the 133–270 K range, at frequencies in the 0.05 Hz–300 kHz range. Its dielectric relaxation time, τ, is 1.5 s at 133 K. The Arrhenius plot of its τ is found to bend sharply at ∼200 K, and the Arrhenius energy decreases from 49.9 kJ/mol at 260 K to 23.3 k…
We have used the linear muffin-tin-orbital method, without geometrical approximations, to calculate the electronic structure of tetragonal BaTiO3 and cubic SrTiO3. Using our self-consistent potential, we have calculated the frequency-dependent dielectric function and the reflectivity spectrum. For tetragonal BaTiO3 th…
Using classical dynamics simulations, we model the long-lived structural effect of ultraviolet irradiation on amorphous silica. We find a significant increase in density of a model of amorphous silica following localized energy deposition, in agreement with experimental observation. We present evidence that this densi…
The phonon modes of a pure ErVO4 crystal were determined at room temperature using Raman scattering methods, and the observed frequencies were assigned according to group theory in terms of the internal modes of the VO43− ions and the external modes of the Er(VO4) lattice. The assignments of the phonon modes match wel…
Abstract An investigation of regularities of surface‐tension alterations in the aqueous solutions of lignosulfonate and aluminum‐containing organosilicon oligomer (olygoheterosiloxanolates) reaction mixtures revealed that modification with oligomers can be used for the regulation of the surface activity of lignosulfon…
The microscopic origin of the exchange interaction in manganites is studied by solving an electronic model Hamiltonian for the Mn-O-Mn triad. It is shown that the magnetic structure of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ is correctly described within an electronic Hamiltonian model, p…
In order to facilitate the large-scale preparation of active class II polyhydroxyalkanoate (PHA) synthase, we constructed a vector pT7-7 derivative that contains a modified phaC1 gene encoding a PHA synthase from Pseudomonas aeruginosa possessing six N-terminally fused histidine residues. Overexpression of this phaC1…