Materials Literature
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A series of Na2MoO4/SiO2 catalysts with various loadings of Na2MoO4 have been characterized using secondary ion mass spectrometry (SIMS), X-ray photoelectron spectroscopy (XPS), FTIR and X-ray diffraction (XRD). Their catalytic activity for methane oxidative coupling (MOC) has been tested. The results revealed some ty…
The behavior of large induction motors during transient as well as steady state running conditions is of significant interest to the power industry. A variety of analytical predictive tools are employed to aid the design and predict their operation under transient and steady state conditions. This paper presents a str…
Broadband dielectric spectroscopy in the frequency range from 10−4 to 109Hz was employed to study the molecular dynamics of various triphenylene and benzene derivatives in their isotropic and liquid crystalline phases. For all derivatives, two relaxation processes were detected in their columnar mesophases. The β-proc…
Molecular trees, also called dendrimers, arborols, cauliflowers, cascades or hyperbranched molecules, have been synthesized since their first observation in 1978 by divergent, convergent or combined methods, with various functions on the branches. The potential applications of these nanoscopic molecules are in the fie…
Silicon nitride sintered bodies composed of finegrained α-Si3N4 and β′-sialon were fabricated by the gas-pressing sintering method. The silicon nitride sintered body showed a very high strength of about 2.0 GPa at room temperature, shock resistance of about 20kJ·m-2 (Charpy impact value) and 3-point bending fatigue li…
The paper outlines a method for comparing the tightness of two woven fabrics. The tightness of a woven fabric is determined with reference to the nearest maximum-sett fabric to the given fabric. The purpose is not to categorise woven fabrics in terms of their tightness but to enable fabrics to be designed with referen…
This paper describes the parameters recommended for rational design of amphiphile-based drug carriers. The main advantage of a carrier is its ability to modify the pharmacokinetics and biodistribution of the drug, so that the drug level at the target is sufficient for therapeutic benefits. Three parameters are describ…
Chicken mitochondrial and Escherichia coli aspartate aminotransferases K258H, in which the active site lysine residue has been exchanged for a histidine residue, retain partial catalytic competence [Ziak et al. (1993) Eur. J. Biochem. 211, 475-484]. Mutant PLP and PMP holoenzymes and the complexes of the latter (E. co…
Novel nis(l,3-dithiole) donors ( 4) and ( 5) containing thiophene spacer units have been prepared.The cyclic voltammograms indicate that 4 and 5 are oxidized to mcation radicals and terracations, respectively, and on-site Coulombic repulsion in the dication state is reduced.An electroactive polymer was formed from 4c.…
Abstract A structural study was carried out on poly(α‐butyl β‐ L ‐aspartate), which is a stereoregular nylon‐3 derivative with an alkoxycarbonyl group attached to the β‐carbon of the main‐chain repeating unit. Two crystal forms, namely hexagonal and tetragonal, made of 13/4 and 4/1 helices, respectively, and bearing a…
Amorphous, mesoporous titania–silica aerogels with high Ti dispersion, synthesised using a sol–gel process followed by semicontinuous extraction with supercritical CO2, are shown to be excellent catalysts for the epoxidation of bulky cyclic olefins.
A considerable amount of work has been carried out on stress relaxation phenomenon in polymers, particularly, polymeric fibres. However, there is almost no published work available on a newly observed phenomenon, known as ‘Inverse Relaxation’. The theoretical work on stress relaxation carried out until now has been ba…
We report experimental evidence for the divergence of the collective diffusion coefficient in a quasi-two-dimensional fluid. The system studied is a monolayer of nearly monodisperse self-assembled disks of the diblock copolymer polystyrene-b-polymethylmethacrylate, supported in the air/water interface, and the method…
Bacterial cellulose (BC) is produced by some strains of Acetobacter. The BC has unique network structure of fine fiber. The BC can be obtained with two typical methods, namely static and agitated culture. We have found some structural differences between these two types of BC. We, therefore, investigated the propertie…
Delayed neointimal healing of a fabric vascular prosthesis was investigated in an animal study focusing on the relationship between red thrombus, fibrinolysis, and endothelialization on the luminal surface. Fabric vascular prostheses were implanted into the descending aortas of 72 dogs. Fifty-nine grafts were explante…
The design of a new electrochromic display based on Langmuir-Blodgett (LB) films of the praseodymium bisphthalocyanine complex is reported. In situ UV-VIS spectra of the display show four colour changes, blue→green→yellowish→red, when a potential ranging from –2 to +2 V is applied. The device retains its colouration u…
Measurements of thermally stimulated currents were made on ionomer/polyethylene blends. The objective of this work was to study space charge formation in these materials. Two ionomers were compared; both ionomers contained methacrylic acid, neutralized by zinc in one and by sodium in the other. A large current peak ce…
Two types of trans-4-alkylcyclohexyl-substituted 2,3-difluorobiphenyls that exhibit quite high smectic C (Sc) phase stability are reported. In addition, the analogous trans-4-alkyl-2,2-difluorocyclohexyl-substituted 2,3-difluorobiphenyls are reported and these materials have much lower Sc character. A useful alternati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergy-Consuming Micromechanisms in the Fracture of Glassy Polymers. 2. Effect of Molecular Weight on the Fracture of PolystyreneM. Sambasivam, A. Klein, and L. H. SperlingCite this: Macromolecules 1995, 28, 1, 152–159Publication Date (Print):January 1, 1995Publication Histo…
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