Materials Literature
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Abstract Vibrational (IR and Raman) spectra for the metal‐free phthalocyanine (H 2 Pc) have been comparatively investigated through experimental and theoretical methods. The frequencies and intensities were calculated at density functional B3LYP level using the 6‐31G(d) basis set. The calculated vibrational frequencie…
The performance of environmentally friendly water-based polyurethane dispersions (PUD) for waterproof breathable coating was studied. The effect of the nature of PUD, number of coatings, incorporation of additives, and processing conditions on the breathable properties of cotton fabric was evaluated. The relative prop…
Diamond (carbon) and silicon powders were mixed and HIPed under temperatures of 1300°–1500°C and pressure at 50 MPa for 30 min. When heated at >1300°C, the products were >90% sintered compacts. Density and bending strength were measured. The highest values of 3.3 g/cm 3 and 750 MPa were obtained when the startin…
Abstract The influences of branch content on the miscibility of octene LLDPE made by metal‐locene catalyst (m‐LLDPE) and by Ziegler‐Natta LLDPE (ZN‐LLDPE) in LDPE were investigated with rheological methods. Dynamic and steady shear measurements were carried out in a Rheometrics Mechanical Spectrometer 800. Here, m‐LLD…
We report the synthesis and physical properties of four novel bent-core compounds, containing an azo linkage and alkyl terminal chains. It is found that, except for the lowest homologue, all the materials are liquid crystalline, exhibiting columnar or tilted polar smectic phases. In one of the compounds a reversible p…
The 3.3-kJ dense plasma focus (DPF) device is used to deposit diamond-like carbon thin films by ablating the high purity graphite fitted to the top of the anode. The plasma focus dynamics was observed using shadowgraphic method to confirm the symmetrical current sheath dynamics and to outline the thin-film deposition…
Abstract Summary: In situ microfibrillar poly(ethylene terephthalate) (PET)/polyethylene blends (MRB) were successfully fabricated by slit‐die extrusion‐hot stretching‐quenching. The morphology of this new material is mainly influenced by the composition and the hot stretching. Appropriate PET concentrations and a com…
The possible use of modified nanodiamond powders in heterogeneous and electrochemical oxidation catalyses is analyzed. It is shown that the efficiency of oxidation catalysis depends on the content of atomic oxygen. The inference is drawn that the electrochemical modification of the surface of nanodiamond powders in a…
The optimum conditions for sintering nano‐phase alumina powder to theoretical density with high hardness and strength were determined. As‐received gamma alumina powder was transformed to alpha alumina by heating for 8 min at 1300°C, and 0.1 wt% MgO was added to the gamma powder. These conditions resulted in 100% alpha…
The single‐phase α‐sialon ceramics with high optical transmittance have been prepared by hot pressing. The maximum transmittance reached 65.2% and 52.2% in the infrared wavelength region, 58.5% and 40% in the visible region for the samples 1.0 and 1.5 mm thickness, respectively. The material also exhibited good mechan…
A novel amidase acting on (R,S)-piperazine-2-tert-butylcarboxamide was purified from Pseudomonas sp. MCI3434 and characterized. The enzyme acted R-stereoselectively on (R,S)-piperazine-2-tert-butylcarboxamide to yield (R)-piperazine-2-carboxylic acid, and was tentatively named R-amidase. The N-terminal amino acid sequ…
Waste rubber powder (RP) was processed in a Brabenderpremixer under various conditions in the presence of reclaiming agents toconvert the RP into plastic mass (reclaimed rubber), then the obtained reclaimwas blended with both NR and SBR in different ratios. It was found that thebehavior of the reclaim in both NR and S…
In this work we demonstrate that fine Ti 3 SiC 2 powders can be tape‐cast and/or cold‐pressed and pressureless‐sintered in Ar‐ or Si‐rich atmospheres to produce fully dense, oriented microstructures in which the basal planes are parallel to the surfaces. Carbon‐ and/or Si‐rich environments suppress grain growth. In th…
In this paper, molecular modeling and optimization for the naphtha catalytic reforming process is studied. The catalytic reforming process is for producing high octane number gasoline by reforming reactions in three sequencing fixed bed reactors. Feed naphtha coming from an atmospheric distillation unit consisted of m…
Optical absorption and emission spectra and fluorescence lifetimes were measured for Nd3+ in a series of five oxide glasses. Spectroscopic parameters such as the stimulated-emission cross section, the effective bandwidth of the 4F3/2→4I11/2 transition, and the radiative lifetime of the 4F3/2 level were obtained, and t…
The synthesis and liquid crystalline properties of several new compounds unsymmetrically substituted about two different central phenyl rings are reported. All the compounds contain a strongly polar terminal cyano/nitro substituent. Some of the nitro-substituted compounds derived from 3-hydroxybenzoic acid show a tran…
Abstract In this report, we show that the microstructures of hydrogen‐bonded side‐chain liquid‐crystalline block copolymers can be rapidly aligned in an alternating current (AC) electric field at temperatures below the order–disorder transition but above the glass transition. The structures and their orientation were…
A series-form expression for the individual diffracted field of a general annular ring is derived from the Rayleigh-Sommerfeld diffraction integral. It can be used for the accurate and fast simulation of any diffractive focusing element composed of concentric transparent rings. We present a comprehensive analysis, bas…
This study focuses on the optimal conditions for gamma irradiation to reduce the molecular weight of chitosan but still retain its chemical structure. Chitosan was irradiated under various conditions, i.e. flake solid state (condition 1), flake dispersed in water (condition 2), flake dispersed in 0.05, 0.1, 1 and 2% a…
The use of neutral π-radicals as building blocks for molecular conductors holds both appeal and challenge. Such systems obviate the need for counterions, as charge transfer is not required to generate charge carriers. Essentially an array of π-radicals should function like atoms in an elemental metal, e.g., sodium, af…