Materials Literature
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In this work, we synthesized a new diamine containing a pendant adamantane group and a flexible aryl ether unit, 2,2-bis[4-(4-aminophenoxy)phenyl]adamantane (BAPA) in three steps starting from 2-adamantanone. A series of new polyamides having inherent viscosities of 0.72–0.90 dL·g–1 were prepared by direct polycondens…
Abstract Thermoplastic polyurethane elastomers (TPU) and polyethylene (PE) form immiscible blends with an extremely low compatibility. In order to improve the dispersion, stability, and properties of these blends, polyethylene was grafted with maleic anhydride (PE‐g‐MA). Subsequently, it was blended with a commercial…
A first-principles method based on the local-density approximation using discrete variational clusters has been used to study the electronic structure of bcc metals, Li, Na, K, V, Nb, Ta, Cr, Mo, and W. The binding energy of these metals was calculated, and the relationship between the binding energy and the volume of…
Laser-ablated Rh atoms react to give RhO, the linear dioxide ORhO, the side-bound dioxygen adduct (O 2 )RhO 2, and several ORhO(O 2 ) complexes. In addition, a large number of Rh x (O 2 ) y complexes are observed, but only Rh(O 2 ) and (O 2 )Rh(O 2 ) can be identified with the support of DFT frequency calculations. Th…
The main objective of this investigation is to improve the photoluminescent performance of existing phosphors by adding a new co‐dopant. The candidate co‐dopants adopted in the present investigation are confined to substituents for the Zn site. In this context, the co‐doping effect of Mg and/or Cr upon emission intens…
A single-crystal X-ray diffraction study of synthetic pseuowollastonite (CaSiO 3 ) shows that this crystal has monoclinic C2/c symmetry, with a = 6.8394(5), b = 11.8704(9), c = 19.6313(7) Å, P = 90.667(6)°, and V= 1593.7(2) Å 3 . Basic features of the C2/c structure are similar to those previously determined with a C1…
Abstract The use of disodium peroxodisulphate combined with a neutral buffer is a new method for the efficient removal of organic matter from clay-bearing sediments. The effects of this oxidation procedure on mineral structure were investigated by treatment of different standard clay minerals (kaolinite ‘china clay’,…
Scytalone dehydratase is a molecular target of inhibitor design efforts aimed at preventing the fungal disease caused by Magnaporthe grisea. A method for cocrystallization of enzyme with inhibitors at neutral pH has produced several crystal structures of enzyme-inhibitor complexes at resolutions ranging from 1.5 to 2.…
Abstract Electronic spectra of the active π-electronic dianion of 1,4-benzoquinone and its hydrogen-bonded complex with CH3OH, generated at sequential electroreduction steps, have been discussed from the points of view of the observation techniques and n–σ charge-transfer interaction of the dianion with a weak hydroge…
${\mathrm{CuCr}}_{2}{\mathrm{Se}}_{4}$ is one of the few compounds that exhibits a magneto-optical (MO) Kerr angle of greater than one degree at room temperature. To better understand the origin of this effect, the MO properties of ferromagnetic ${\mathrm{CuCr}}_{2}{X}_{4} (X=\mathrm{S},\mathrm{}\mathrm{S}\mathrm{e},\…
The leakage and dielectric relaxation currents of MOCVD Ba0·7Sr0·3TiO3 thin films with Pt electrodes after post top electrode anneals in oxygen and forming gas (95% Ar, 5% H2) were investigated. The Schottky barrier height for thermionic emission of electrons from the cathode varied depending on annealing conditions.…
Abstract High‐density polyethylene (HDPE) and isotactic polypropylene (PP) were mixed either with a stabilizer or with a stabilizer and a compatibilizer in different mixing ratios. The structure and properties of these blends were analyzed by methods such as torsion pendulum measurements, mechanical short time experim…
Molecular dynamics simulations of lithium metasilicate (Li(2)SiO(3)) glass have been performed. The motion of lithium ions is divided into slow (A) and fast (B) categories in the glassy state. The waiting time distribution of the jump motion of each component shows power law behavior with different exponents. Slow dyn…
It is well recognized that pH plays a significant regulatory role in most cellular processes. Increasingly, there is interest in transmembrane pH gradients, particularly with respect to tumor growth and response to therapy. NMR offers a non-invasive approach to monitoring cellular pH and detecting changes in response…
The crystal structure of a rubidian cesian phlogopite-1M from pegmatite exocontacts at Red Cross Lake, Manitoba, monoclinic, a = 5.343(1),6 = 9.247(2),c = 10.397(3) Å, β = 100.04(2)°, V= 505.8(2) Å 3 , has been refined to an R index of 4.5% based on 519 observed reflections measured with graphite-monochromated MoΚα X-…
In this study, the effects of ionizing radiation on the aromatic polymers polyethersulfone (PES) and polyetheretherketone (PEEK) were investigated. UV light, /spl gamma/ rays and a high-energy electron beam were used as radiation sources. A range of techniques has been utilized to investigate changes in PES and PEEK a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(p-phenyleneethynylene)s Are Thermotropic Liquid Crystalline†Lioba Kloppenburg, David Jones, John B. Claridge, Hans-Conrad zur Loye, and Uwe H. F. BunzView Author Information Department of Chemistry and Biochemistry, The Univers…
Abstract The coalescence behavior of immiscible blends was determined by annealing the melt without shear. The kinetics and the mechanism of coalescence were observed for blends of thermoplastic polyurethane (TPU) and polyolefins. Two different types of measurements were used to observe coalescence in quiescent melt a…
This report provides guidelines in selecting materials for satellites and space platforms, designed to operate within the Low-Earth orbit environment, which limit the effects of atomic oxygen interactions with spacecraft surfaces. This document should be treated as an introduction rather than a comprehensive guide sin…
The crystal structure of sulfathiazole [4-amino- N -(2,3-dihydro-2-thiazolylidene)benzenesulfonamide, C 9 H 9 N 3 O 2 S] polymorphic form V has been determined from high-resolution synchrotron X-ray powder diffraction data. The structure is monoclinic, space group P 2 1 / n , Z = 8, with two molecules in the asymmetri…