Materials Literature
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Crystallization is often employed for purifying a drug substance. Use of different solvents and processing conditions may change the crystal habit, besides altering the polymorphic state. Furthermore, altered habit may result from crystal growth during storage. Hence, there is a need to understand the factors influenc…
Lyotropic liquid crystalline phases formed at high concentrations of nonionic surfactants provide a versatile templating medium that can be used to produce nanostructured materials with regular arrays of pores of nanometer dimension and extended periodicity. In this work, we have used this technique to prepare nanostr…
Polyesters containing thiolate chain end were obtained from the “controlled” ring-opening polymerization (ROP) of ε-caprolactone or δ-valerolactone initiated by several novel aluminum thiolates. The initiators, [(MOBT) 2 AlR] ( 1, R = Me; 2, R = Cl) can be obtained in high yield from the interaction of Me 3 Al or Et 2…
The reaction of Cd(OH)2 with 3,3′-azodibenzoic acid affords an unprecedented anionic chiral diamondoid network, bis(3,3′-azodibenzoate)cadmium·(H2NMe2)·(NH4) which contains eight-coordinate cadmium and displays strong SHG response and enantioselectivity for organic amines.
Aim Relationships between diatom distribution, composition, species richness and environmental variables in lakes in Arctic Lapland were explored with particular attention to temperature. Location Transect in northern Fennoscandia (66°92–69°27) spanning boreal coniferous forest to treeless tundra along an altitudinal…
Light-based microscope imaging techniques using fluorescence sensor molecules suffer from photobleaching and light scattering, but magnetic resonance imaging (MRI) can provide three-dimensional imaging without these problems. Recently, “smart” MRI contrast agents which modulate the access of water to a chelated gadoli…
Layered double hydroxides (LDH) containing NiAl or NiV of varying M(II) ∶ M(III) ratios have been prepared by coprecipitation and characterized by XRD, elemental analysis, and FT-IR. The LDHs electrochemical properties were investigated to determine their potential application as positive electrodes in Ni–Cd and NiMH…
This paper presents a reviewal profile of water absorbing resins based on graft copolymers of acrylic acid and gelatinised starch. It first elaborates on the synthesis of these hydrogels, use of these hydrogels in a variety of commercial applications, and the role of hydrogen bonding in the water absorbing capacity of…
Controlled aging of TiO2 nanoparticles blended with diblock copolymers and processed into dip-coated thin films led to ordered mesostructures with cubic and hexagonal symmetries that can be transformed into mesoporous TiO2 by calcination.
Synthetic analogues of francisite, a mineral of complex formula Cu3Bi(SeO3)2O2X with X = Cl, Br, I, have been obtained by solid state reaction. Contrary to the previous structure description, the framework can be better described as formed of copper(II)–oxygen layers linked together in the [001] direction by long bism…
A number of doped lanthanum chromite perovskites are considered as anode materials for solid oxide fuel cells with an yttria-stabilized zirconia (YSZ) electrolyte operating in hydrogen at 850°C. The polarization resistance is measured by impedance spectroscopy, and shown to depend significantly on the type and amount…
Among the light metal alloys, magnesium is the lightest structural material with a density of 1.74 g/cm3 and many attractive physical and mechanical properties combined with processing advantages. Therefore, it represents a very attractive material for a large amount of applications from main user automotive industry…
National Nanohybrids Materials Laboratory (NNML)School of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-747, KoreaReceived May 26, 2001Negatively charged functional organic molecules such as retinoic acid, ascorbic acid, indole acetic acid, citricacid, salicylic acid, acidic dye (indigo car…
The Structure and Electrochemical Behavior of Nitrogen-Containing Nanocrystalline Diamond Films Deposited from CH4/N2/Ar Mixtures , Chen, Qingyun, Gruen, Dieter M., Krauss, Alan R., Corrigan, Timothy D., Witek, Malgorzata, Swain, Greg M.
Compound 1, containing an octamethylferrocene donor linked to a nitrothiophene acceptor via an ethenyl linker, shows a static first hyperpolarisability β0 of 95(±10) × 10−30 esu, which is reduced to 10(±2) × 10−30 esu on oxidation of the octamethylferrocene unit; this provides for a simple redox-based switching of the…
Material samples of silicone rubber with known differences in their composition, i.e. different filler content and extra silicone oil added, have been aged at the Anneberg field station on the west coast of Sweden. ac or dc voltage supplied to cylindrical samples at stress levels of 50 or 100 V/mm. The work includes l…
The undoping ZnO emitting films were deposited on Si substrates by dc reactive sputtering. There are two peaks of photoluminescence (PL), centered at 3.18 eV (ultraviolet), and at 2.38 eV (green), to be observed in the samples. We investigated the dependence of PL spectra on annealing temperature and annealing atmosph…
In this, Part II of a two-part study, the oxidation kinetics in air of the ternary compounds and are reported. For the first two compounds, in the 1000-1100°C temperature range and for short times (≈20 h) the oxidation kinetics are parabolic. The parabolic rate constants are for and for At 900°C, the kinetics are quas…
Abstract The formation of clay minerals within active fault zones, which results from the infiltration of aqueous fluids, often leads to important changes in mechanical behaviour. These hydrous phyllosilicates can (1) enhance anisotropy and reduce shear strength, (2) modify porosity and permeability, (3) store or rele…
Increasing the permittivity of the propagation medium inside a hollow tube lowers its cut-off frequency, allowing it to transmit a wider range of signal frequencies. This principle is applied to the design of dielectric windows that can be used to facilitate partial discharge (PD) detection at ultra high frequency (UH…