Materials Literature
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Time-resolved fluorescence anisotropy of a bound extrinsic probe was studied in an effort to characterize dynamic properties of the transient partially folded forms that appear during the folding of the alpha-subunit of tryptophan synthase (alphaTS) from Escherichia coli. Previous studies have shown that alphaTS, a si…
Abstract A new method for the preparation of Pd nanoparticles immobilized on alumina at room temperature by ultrasonic irradiation of an aqueous solution of tetrachloropalladate(II) is reported. The size of Pd particles can be controlled by changing the type of alcohol and the amount of coexisting alumina.
Axially fluorinated cyclohexane derivatives are a promising new type of liquid crystals with negative dielectric anisotropy. Up to now, the technical application of these materials in LCDs was impeded by their strong tendency to form smectic B mesophases. We present a convenient synthetic pathway leading to new homolo…
Polymer-like organic thin films were deposited by plasma enhanced chemical vapor deposition (PECVD) using the para-xylene precursor. The effect of the plasma power on the dielectric constant and thermal stability was significant. As the plasma power was increased from 5 W to 60 W, the relative dielectric constant incr…
Abstract Processing of microcellular foam was studied for polyurethane. Assuming that the bubble growth is controlled by diffusion, theoretical prediction was carried out numerically to understand the bubble growth mechanism in the cavity during mold filling. Final bubble sizes were also predicted by considering the g…
Abstract CdS-Au hybrid nanoparticles are synthesized through electrostatically self-assembling of the pre-formed monodisperse CdS and Au nanoparticles via the interaction between ammonium ions and carboxylate ions which were modified on CdS and Au nanoparticle surface, respectively.
Four bis(ether anhydride)s, 4,4′-(1,4-phenylenedioxy)diphthalic anhydride (IV), 4,4′-(2,5-tolylenedioxy)-diphthalic anhydride (Me-IV), 4,4′-(2-chloro-1,4-phenylenedioxy)diphthalic anhydride (Cl-IV), and 4,4′-(2,5-biphenylenedioxy)diphthalic anhydride (Ph-IV), were prepared in three steps starting from the nucleophilic…
In the pulsed-laser deposition process, high intensity laser pulses expel material from a solid target and form expanding plasma near the solid surface. The expansion of the plasma produces a forward-directed beam of ionized and neutral species with typical energies of 1–100 eV. In this study, amorphous diamond-like c…
Langmuir films composed of disc-shaped molecules (rather than traditional amphiphiles) are briefly reviewed. The molecules investigated typically have a flat, conjugated core and flexible side chains, such as the triphenylene derivatives shown in the Figure. Information obtainable from pressure–area isotherms is discu…
Epitaxial (001) oriented SrTiO3 films have been deposited on LaAlO3(001) substrates by off-axis radio frequency magnetron sputtering in Ar:O2 gas mixtures at substrate temperatures ranging from 650 to 850 °C. For the deposition conditions used, stoichiometric targets yielded 20% Sr-deficient films, whereas Sr-enriched…
A thermostabilized mutant of Bacillus subtilis 3-isopropylmalate dehydrogenase (IPMDH) obtained in a previous study contained a set of triple amino acid substitutions. To further improve the stability of the mutant, we used a random mutagenesis technique and identified two additional thermostabilizing substitutions, T…
Electron field emission has been observed from carbon thin films at relatively low electric fields. These films range from amorphous carbon to polycrystalline diamond films. There are many models that attempt to account for the electron field emission process observed in these films. The initial models that were based…
Pure enantiomers are frequently prepared by the technique of resolution by entrainment. However, this does not work if the samples are lamellarly twinned conglomerate crystals, which is often the case for α-amino acid salts, especially amphiphilic ones. A method based on the addition of chiral /6tailor-made′ enantiose…
The electronic structures of the doped perovskite oxides, ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3} (x=0.0,$ 0.25, 0.5, 0.75, 1.0), are studied using density-functional methods. In the 0.25- and 0.75-doped system, metallic property is found, while for the 0.5-doped compound with both orthorh…
Abstract Thin film coating of CaCO3 crystals on a chitin fiber from CaCO3 solution in the presence of an acid-rich macromolecule leads to the fabrication of a novel type of organic/inorganic composites. Molecular interactions between functional groups of these organic matrices play a key role for this control of inorg…
The galvanostatic reduction of the nickel hydroxide electrode is known to proceed at two successive potentials without this phenomenon being well understood. In this paper we prove that this second discharge plateau is unrelated to oxygen reduction and that it can be observed in the absence of the γ‐NiOOH hydrated pha…
We report a synchrotron x-ray-scattering study of the magnetoresistive manganite ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}{\mathrm{MnO}}_{3}.$ At low temperatures, this material undergoes an x-ray-induced structural transition at which charge ordering of ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{4+}$ ions characteris…
Rh-exchanged Al−MCM-41 is studied for selective catalytic reduction (SCR) of NO by C 3 H 6 in the presence of excess oxygen. It shows a high activity in converting NO to N 2 and N 2 O at low temperatures. In situ FT-IR studies indicate that Rh−NO + species (1910−1898 cm -1 ) is formed on the Rh−Al−MCM-41 catalyst in f…
There is a need to better understand electrical ageing of solid insulating materials in dry environment and discharge-free conditions. Photons emitted by a stressed material give evidence of the generation of highly reactive molecular states that could control degradation reaction.
The interaction between the dendrimers poly(1,4-diaminobutane) DAB n ( n = 8, 16, 32, 64) and poly(pyrrolidone-1,4-diaminobutane) DAB n Py ( n = 8, 16, 32) with the surfactants sodium dodecyl sulfate (SDS), tetradecyltrimethylammonium bromide (TTAB), and hexaethyleneglycol monododecyl ether (C 12 EO 6 ) have been stud…