Materials Literature
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The effects of oil palm wood flour and vulcanization system on curing characteristics and mechanical properties of oil palm wood flour (OPWF)-natural rubber composites were studied. OPWF loading in the range of 0-50 phr and two vulcanisation systems, conventional vulcanisation (CV) and semi-efficient vulcanisation (se…
The rate of thiol-disulfide exchange of dansyl groups mediated by dithiothreitol depends on the structure of the dendrimer. In general, the rate of exchange decreases as the size of the dendrimer increases. Dendrimers with disulfides attached near the core undergo exchange more slowly than dendrimers with disulfides n…
Abstract Non-ionic surfactants Brij 56 and Igepal CO 720, containing hydrophilic poly(ethylene oxide) (PEO) segments, expanded smectite from 1.5 nm to 1.7 nm at room temperature. The surfactant-smectite composites had larger layer spacings than Ca-smectite after heat treatment. The surfactant-smectite composites were…
Carbon-hydrogen bond cleavage reactions of CH3OH and CH4 by a dirhodium(II) diporphyrin complex with a m-xylyl tether (.Rh(m-xylyl)Rh.(1)) are reported. Kinetic-mechanistic studies show that the substrate reactions are bimolecular and occur through the use of two Rh(II) centers in the molecular unit of 1. Second-order…
In order to detect and locate partial discharge (PD) activity within HV cables and in particular cable joints, the feasibility of using a very high frequency WHO capacitive coupler technique has been investigated. In addition, an alternative PD offline test method for cable joints or cable sections within long cable s…
Alumina bicrystals with low‐angle and near‐Σ3 <0001> tilt grain boundaries were fabricated using diffusion bonding to study the dislocation structures in alumina grain boundaries. The resulting grain‐boundary structures were investigated using high‐resolution transmission electron microscopy, and the grain‐bound…
We present a novel method for forming linearly polarized axially symmetric beams with various polarization orders that is based on computer-generated space-variant subwavelength gratings. We introduce and experimentally demonstrate that our space-variant polarization state manipulations are accompanied by a phase modi…
Abstract Silica‐based hybrid organic‐inorganic materials prepared by sol‐gel chemistry exhibit chemical and physical properties revealing their anisotropic organization. Besides the opportunities that these phenomena open for the preparation of new materials, they also provide arguments for the chemist looking for bet…
PURPOSE: To compare the diagnostic accuracy of gadobenate dimeglumine (Gd-BOPTA)-enhanced versus gadoterate meglumine (Gd-DOTA)-enhanced magnetic resonance (MR) angiography in patients with peripheral arterial occlusive disease (PAOD). MATERIALS AND METHODS: Fifty-six patients underwent MR angiography enhanced with ei…
Symmetrical Σ7 tilt grain boundaries of alumina (Al 2 O 3 ) were studied using bicrystals. Three types of Σ7 boundaries were successfully fabricated, that is, rhombohedral twin (Σ7{1[Onemacr]02}) and two types of [0001] symmetrical tilt grain boundaries with grain‐boundary planes {4[Fivemacr]10} and {2[Threemacr]10} (…
We report the growth and detailed structural investigation of a new morphological manifestation of carbon-based nanostructures in the form of tapered whiskers with uniform 1−3 nm hollowness. The base of the whiskers is in the submicron scale, tapering uniformly to form a pointed tip in the form of a pipette. These hol…
Recent developments in modelling the sintering process of powder compacts are critically reviewed. Both free sintering and pressure assisted sintering are considered. The review approaches the sintering models from the point of view of an end user of the models and sets out to: assess how useful and accurate the exist…
Adsorption isotherms for hydrogen on single-walled nanotubes (SWNTs) subjected to various types of pretreatment have been measured by a tapered-element oscillating mass analyzer. Isotherms at room temperature over a range of pressures up to 48 bar have been measured. We demonstrate that activation of the SWNT samples…
BACKGROUND: Exposing the developing tissue to flow and pressure in a bioreactor has been shown to enhance tissue formation in tissue-engineered heart valves. Animal studies showed excellent functionality in these valves in the pulmonary position. However, they lack the mechanical strength for implantation in the high-…
Abstract The hyperbranched (HB) aromatic polyamide synthesised by direct polycondensation of 5‐(4‐aminobenzoylamino)isophthalic acid (ABZAIA) has been solution‐ and melt‐ blended with polyamide 6 (PA6) incorporating different end groups. The concentration of p(ABZAIA) in PA6 has been varied from 5 to 30 wt.‐% in order…
Abstract Several aluminium alkoxides are prepared, and their catalytic activities toward ring‐opening polymerisation of ε ‐caprolactone have been investigated. The reaction of [( μ ‐EDBP)AlMe] 2 (EDBP‐H 2 : 2,2′‐ethylidenebis(4,6‐di‐ tert ‐butylphenol)) with 2 molar equiv. of monomethylethylene glycol yields a five‐co…
This chapter contains sections titled: Introduction Thermodynamics of Passivation Kinetics of Processes at the Passivated Electrode Surface Film Growth Laws and the High Field Mechanism Analytical Methods and their Application to Passivity and Corrosion Electrochemical Methods Ex Situ Surface Analytical Methods Electr…
The thermomechanical properties of polyurethane shape memory polymer (SMP) foams were investigated experimentally. The results obtained can be summarized as follows. (1) By cooling the foam after compressive deformation at high temperature, stress decreases and the deformed shape is fixed. Stress decreases markedly in…
An improved method to calculate the gamma-ray buildup factors including bremsstrahlung has been developed. The exposure buildup factors with bremsstrahlung were computed by the present method for lead, iron and water at the source energy of 10.0 MeV up to depths of 100 mfp. The accuracy of the present method was check…
The temperature dependence of density, refractive indices, apparent molecular length and intermolecular distance of 11CHBT, are reported, together with the static dielectric permittivities, ε∥, ε┴, ε iso of 11CHBT and 12CHBT; the effect of chain length on various physical properties of the CHBT series is also discusse…