Materials Literature
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This paper considers the compression properties of yarns. A model is proposed which predicts the behaviour of yarns in compression; the model takes account of the structural characteristics of yarns and the finite dimensions of fibres. A device is described which has been successfully used to measure the effects of co…
A new photoactive bis-anthracenyl crown undergoes a reversible photocyclisation to form a cryptand, with the efficiency of the forward reaction and the rate of the thermal reverse reaction strongly affected by the presence of cation substrates.
Phenomenological modeling of the long term general corrosion of mild and low alloy steel specimens under marine conditions is considered, using weight loss as a function of time. A conceptual model for immersion corrosion, tidal corrosion and atmospheric corrosion under marine conditions is proposed. The model uses ac…
Nanostructured palladium clusters, stabilized by a monomolecular coat of sufactants N(C 8 H 17 ) 4 Br or N(C 18 H 37 ) 4 Br, self-assemble on carbon surfaces in an ordered manner with the formation of hexagonal close packed structures.
In order to study the kinetics of interaction of 3-aminopropyltriethoxysilane (APTS) on silica gel, silica gel samples reacted with APTS were prepared by sampling the reaction mixture from the reactor at various time intervals, and the concentrations of 3-aminopropylsilyl (APS) groups modified on the silica gel surfac…
This paper considers the distribution of fibres in yarns and discusses the development of a model for the simulation of fibre distributions; the concept of ‘virtual location’ within the cross-section domain, which may contain a fibre, is introduced. The distribution of fibres in real yarns is compared with computer-ge…
A study has been undertaken of the structure-activity relationship of eight new chiral compounds having either a pyrazole (series P) or an isoxazole (series I) ring as a central bridge in the mesogenic core. The presence of dimers in the pyrazole compounds accounts for their lower P s values in comparison with the iso…
Chemical modification of the PET surface by carbon dioxide plasma treatment has been studied using X-ray photoelectron spectroscopy (XPS). The plasma process results mainly in the formation of carbonyl, carboxyl, and carbonate groups at the PET surface. Under rather mild treatment conditions (low plasma power combined…
Poly(1,4-butanediol succinate) copolymers were prepared by melt polycondensation of succinic acid and 1,4-butanediol with 10–50mol% (in feed) of poly(ethylene glycol) (PEG), where molecular weight (MW) of PEG is 200–2000. The reduced specific viscosity of the copolymers increased with incorporation of the PEG componen…
Complete suppression of color shift in in-plane switching mode liquid crystal displays (LCDs) has been realized. The LCDs have a multidomain structure obtained by unidirectional rubbing and use of zigzag electrodes. The design concept and performance of the devices are described in this paper.
Surface treatment, such as plasma glow discharge treatment, onto poly(lactide-co-glycolide) (PLGA) has been investigated to improve the cell-, tissue- and blood-compatibility. Surface-treated samples were characterized by measurement with a contact angle goniometer and electron spectroscopy for chemical analysis (ESCA…
The reactions between Ti(OR) 4 (R=Et, Pr i ) or [Zr(OPr i ) 4 (Pr i OH)] 2 and various lead oxide precursors [anhydrous Pb(OAc) 2 , alkoxides or oxoalkoxides] have been investigated in different experimental conditions (solvent, temperature). Various mixed-metal species have been isolated in high yields and characteri…
Metal cation-exchanged montmorillonite (M n+ -mont) works in acetonitrile at 80 °C as a Lewis acid catalyst for the intermolecular carbonyl-ene reaction of α-methylstyrenes with paraformaldehyde to give the corresponding homoallylic alcohols, Zr 4+ -mont being the most effective of the many M n+ -mont catalysts examin…
A method to prepare polyglycolide, the simplest polyester, with defined microstructure by solid-state polymerization of halogenoacetates is presented. By choosing the appropriate halogenoacetate it is possible to obtain polyglycolide with variable porosity. The pore size distribution can be varied by choice of the pre…
Intermediate addition of reductant (C 2 H 4 ) into an NO+O 2 stream between an oxidation catalyst for NO to NO 2 (Pt-MFI) and a reduction catalyst for NO x to N 2 (In-MFI), a so-called IAR method, is shown to be very effective in selectively reducing NO to N 2 in the presence of excess oxygen.
Four sodalite materials with Si/Al ratios of ∞, 23.0, 11.0, and 5.7 are synthesized from essentially nonaqueous media in which ethylene glycol is acting both as a solvent and as a structure-directing agent. Elemental and thermal analyses, X-ray powder diffraction, multinuclear MAS NMR, and vibrational spectroscopies a…
The use of waste heat as an energy source for thermoelectric generation largely removes the constraint for the wide scale application of this technology imposed by its relatively low conversion efficiency (typically about 5%). Paradoxically, in some parasitic applications, a low conversion efficiency can be viewed as…
Partial table of contents: Molecular Biophysics of Elastin Structure, Function and Pathology (D. Urry, et al.). Ultrastructure of Elastin (I. Pasquali-Ronchetti, et al.). GENERAL DISCUSSION I: HYDROXYLATION OF THE PENTAPEPTIDE VGVPG IN OVINE ELASTIN. Structure of the Elastin Gene (J. Rosenbloom, et al.). Catalytic Pro…
In this preliminary study, the authors have developed a soil analysis method based on the automated particle search and classification capabilities of a scanning electron microscope equipped with an energy dispersive x-ray spectrometer (SEM-EDX). Innovative sample preparation maximized dispersion and density of soil p…
A well-defined X-ray fiber pattern of chitosan acetate was obtained by immersing a tendon chitosan, prepared from a crab tendon chitin by a solid-state N-deacetylation, in an aqueous acetic acid-isopropanol solution at 110°C. This pattern was very similar to that of chitosan salts with some inorganic acids, such as HF…