Materials Literature
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The origins of a slow reaction rate between the sodium adatoms and the water-ice film have been investigated by analyzing the surface composition using time-of-flight secondary ion mass spectroscopy in the temperature range of 13-230 K. An unhydrated NaOH layer is formed at the water-Na interface at 13 K which is foll…
The thermoluminescence (TL) characteristics of the green emission band of natural calcite are studied. The kinetic parameters of the natural and laboratory-induced defects were estimated. The γ-dose response was studied in the range of 0.01–104 Gy. The fading rate at room temperature is monitored over a period of 30 d…
Aggregatbildung in koordinierenden Lösungsmitteln: Ein Riesenoxidocluster [Bi38O45(hfac)24] (hfac=Hexafluoracetylacetonat) wurde aus Lösungen des Bismutoxidodiketonats [Bi9O7(hfac)13] isoliert und vollständig charakterisiert. Der [Bi38O45]24+-Kern (siehe Bild; orange Bi, rot O, die zentrale Bi6O9-Einheit ist hervorgeh…
Polyhydroxyalkanoate (PHA) granule-associated proteins (phasins) were discovered in PHA-accumulating bacteria. They play a crucial role as a structural protein during initial PHA-granule formation and granule growth and also serve as interfaces for granule stabilization in vivo. The phasin PhaP(Ah) from Aeromonas hydr…
In this work we present an algorithm based on the simulated annealing (SA) method for electron beam spectrum reconstruction from central axis PDD data. We use a simulated beam in order to assess the accuracy of the method, and compare it with others usually employed. We found that our modified SA algorithm produced ex…
ZnO thin films, 100–250 nm thick, were deposited on microscope glass slides and UV fused silica (UVFS) substrates using a filtered vacuum arc deposition (FVAD) system, operating at room temperature (RT) and 200 A for 60 s. The cathode was prepared from 99.9% pure Zn metal and the oxygen background pressure during depo…
Summary Low‐molecular‐weight (LMW) organic acids exist widely in soils, especially in the rhizosphere, and the adsorption of these acids may affect their reactions in soils. The adsorption behaviour of phthalic acid and salicylic acid by two variable charge soils (a Rhodic Ferralsol and a Haplic Acrisol) was investiga…
The semiconducting $\mathrm{Na}{\mathrm{Mn}}_{7}{\mathrm{O}}_{12}$ is a doping-free compound with several coexistent properties such as orbital ordering, charge ordering, and magnetic orderings of different types. We investigated its dielectric response by means of frequency impedance measurements in the range from $2…
We report a methodology that permits quantitation of the azimuthal anchoring energy of the nematic liquid crystal 4-cyano-4'-pentyl-biphenyl on surfaces patterned with oligopeptides. The oligopeptide (IYGEFKKKC), an optimized substrate for the Src protein kinase, was covalently immobilized via the terminal cysteine to…
A mechanism for the photochemical conversion of 2-vinyl-1,3-terphenyl to 8,9a-dihydrophenanthrene (Lewis, F. D.; Zuo, X.; Gevorgyan, V.; Rubin, M. J. Am. Chem. Soc. 2002, 124, 13664-13665) is presented in this study, based on ab initio restricted active space self-consistent field calculations and a molecular mechanic…
By carrying out differential resistance measurements in oxygen deficient ${\mathrm{La}}_{0.67}{\mathrm{Ba}}_{0.33}\mathrm{Mn}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ thin films at different magnetic fields, in submicrometric constricted regions patterned by focused ion beam, we find evidence of hysteretic re…
Abstract Liquid crystal templating has been used to produce metal films with nanometer‐sized pores. While successful templating procedures have been reported for metals from some groups of elements (e.g., groups 9 and 10), no such reports are available for other groups. This work investigates liquid crystal templating…
To graft polymer chains from the surface, a uniform and dense initiator layer on the silicate substrate is indispensable. The initiator monolayer can be fabricated in many ways, of which self-assembly of trichlorosilanes on silicate substrates is widely used. However, uniformity is always going to be an issue when usi…
The clay mineralogical composition of 87 topsoil (0–15 cm) samples from inland valleys (IVs) and flood plains (FPs) in seven West African countries, namely Côte d’Ivoire, Ghana, Guinea, Mali, Niger, Nigeria and Sierra Leone, was examined using X-ray diffraction analysis to gain basic information for the development of…
A self-correction process that is time- and pH-dependent results in growth of perfect superlattices from a bulk solution of hydrophilic Ag nanoparticles, despite their polydispersity, by a vapor-diffusion technique. After 12 weeks, three-dimensional rhombic superlattices are obtained (see picture).
An analytical, phenomenology-based model is proposed for thermal expansion of isotropic single-phase polycrystalline materials. Standard rules of mixing fail to predict correctly the coefficient of thermal expansion (CTE) of such materials. The model introduced in this paper explains and accurately reproduces the U-sh…
Copper phthalocyanine films have been deposited by glow-discharge-induced sublimation. The films have undergone postdeposition heat treatments in air at 250 and 290 °C for different times, ranging from 30 min to 14 h. The properties of as-deposited and heated films have been investigated by different techniques in ord…
Photoluminescent porous silicon (PSi) was produced by Pt-assisted electroless chemical etching of p(-)-Si in a 1:1:2 (v/v/v) solution of HF, methanol, and H2O2. Upon irradiation with ultraviolet light PSi produced under these conditions luminesces with a peak emission near 590 nm that is sufficiently intense to be vis…
Monte Carlo simulation has been used to investigate the effects of linear solvent molecular size on polymer chain conformation in solutions. Increasing the solvent molecular size leads to shrinkage of the polymer chains and increase of the critical overlap concentrations. The root-mean-square radius of gyration of pol…
The linear and nonlinear optical responses of the three aromatic amino acids tryptophan, tyrosine, and phenylalanine have been investigated by time-dependent density functional theory. The effect of the peptidic chain on the polarizabilities and the first hyperpolarizabilities is addressed by substituting different gr…