Materials Literature
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Through an atmosphere-controlled method, a new phase of hydrotalcite-like Co hydroxide with mixed valent states has been synthesised, along with preparations of known α and β phases. Structural and thermal behaviours of all the Co hydroxides have been compared. Three major stages of decomposition are found: (i) 149-16…
Dieses Buch ist Teil unserer neuen Datenbank Anorganik Online . Seit Jahrzehnten das Standard-Lehrbuch der Kristallographie. Dieser Klassiker wird besonders dem interdisziplinären Charakter der Kristallographie gerecht. Anwendungsbezogene Erkenntnisse wie die technisch wichtige Kristallzüchtung, die Kristallisation in…
Two solution‐based methods, metallo‐organic decomposition and sol—gel processes, were used to study the effects of precursor solution type on the microstructure evolution and texture development of oriented PZT films. Microstructure development and perovskite content are strongly dependent on the heating rate. Fast he…
The hydrothermal reaction of Cu(SO4)·H2O, MoO3, 4,7-phenanthroline and water yields [{Cu3(4,7-phen)3}2{Mo14O45}], a material exhibiting a two-dimensional network constructed from (Mo6O19)2– and (Mo8O26)4– clusters linked through planar cyclic {Cu3(4,7-phen)33}+ clusters.
In a polystyrene- block -polybutadiene- block -poly(methyl methacrylate) triblock copolymer (SBM) a morphological transition from a lamellar ( ll ) morphology (with sequence ABCB) to the knitting pattern ( kp ) morphology occurs upon hydrogenation of the center PB block. Structural information of the nonhydrogenated a…
The optical properties of different erbium (Er)-doped polydentate hemispherand organic cage complexes are studied, for use in polymer-based planar optical amplifiers. Room temperature photoluminescence at 1.54 μm is observed, due to an intra-4f transition in Er3+. The Er is directly excited into one of the 4f manifold…
Defect‐disorder models are derived for undoped and strontium‐doped LaMnO 3 . A random‐defect model and a cluster‐defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previ…
Layered double hydroxides (LDH) containing Mg II , Fe III , and Al III in the brucite-like layers and interlayer carbonate (with a constant M II /M III ratio but varying Al III /Fe III ratios) have been prepared and characterised by X-ray diffraction, thermal analysis, FT-IR and UV-VIS/diffuse reflectance spectroscopi…
Sulfathiazole, a compound that forms four known crystal structures, has been examined with a view to understanding its polymorphism. A graph set approach was used to classify the structural differences and similarities of the polymorphs, the results of which indicated packing motifs common to three of the four structu…
The first series of rare-earth carboxylates with an open framework has been prepared hydrothermally (180°C, 3 days) by the action of glutaric acid on the metal chlorides in the presence of base. The crystal structure of the neodymium compound [Nd III (H 2 O)] 2 [O 2 C(CH 2 ) 3 CO 2 ] 3 ·4H 2 O has been determined by s…
The term liquid crystal is often associated with fascinating compounds that exhibit unusual melting or solubilisation properties, however, it also represents a unique collection of mesophases that exist between the solid state and the amorphous liquid. As such, this unique state of matter can be accessed by a wide var…
This report deals with space charge behavior in PE (polyethylene) under dc fields. Direct observation of time-dependent space charge profiles in 3-mm thick XLPE (crosslinked low-density polyethylene) cable insulation under dc electric fields was performed using the pulsed electroacoustic method. Stable hetero charges…
Size exclusion chromatography has been performed on micellar aqueous dispersions of soot from an arc discharge experiment to yield chemically unmodified, almost impurity free and size separated multiwall nanotubes.
Several classes of organic magnets based upon the tetracyanoethenide radical anion, [TCNE].–, either unbound, µ, and µ4 bonded to zero, two and four metal sites have been reported. The putative µ4 bonded V(TCNE)x room temperature magnet has been extended to include M(TCNE)x (M = Mn, Fe, Co, Ni) magnets. M for this cla…
The metal-based luminescence of the Eu and Tb complexes of the octadentate ligands L1 and L2a/2b is a function of pH in aqueous solution: in [EuL1], the red-emission is switched on following N-protonation of the sensitising phenanthridine group (pKa = 4.2, pKS1 = 4.4) with a luminescence enhancement of over 500 for λe…
We have previously used Aspergillus nidulans as a fungal model for human phenylalanine catabolism. This model was crucial for our characterization of the human gene involved in alcaptonuria. We use here an identical approach to characterize at the cDNA level the human gene for maleylacetoacetate isomerase (MAAI, EC 5.…
This review article introduces the application of the cholesterol moiety, which has been commonly utilised as a versatile building block in liquid crystals, organic gels and monolayers, to molecular recognition. Effort has especially been made to clarify the characteristics of cholesterol-based assembly systems and th…
Aldol and Knoevenagel condensations were performed with suitably activated Mg–Al hydrotalcite as catalyst in quantitative yields in the liquid phase under mild reaction conditions at a faster rate for the first time.
A primary factor which limits engineering tissues of substantial size is the lack of nutrients readily available to transplanted cells. One potential solution to this nutrient limitation is to encourage the rapid development of a vascular network within three-dimensional tissue engineering matrices. Vascular endotheli…
Melting experiments on fertile peridotite KR4003, a 'pyrolitic' composition, were made from 3 to 7 GPa in piston-cylinder and multi-anvil apparatus. Temperature gradients across the sample were minimized (<25°C), and the compositions of all phases were determined. Modal abundances of coexisting phases were calculated…