Materials Literature
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The X-ray crystal structures of Escherichia coli gamma-aminobutyrate aminotransferase unbound and bound to the inhibitor aminooxyacetate are reported. The enzyme crystallizes from ammonium sulfate solutions in the P3(2)21 space group with a tetramer in the asymmetric unit. Diffraction data were collected to 2.4 A reso…
Single‐phase lead lanthanum zirconate titanate (PLZT) solid solution powder was synthesized from the constituent oxides at ambient temperature through a mechanical alloying (MA) process and was then densified to fine‐grained ceramics by sintering and hot‐pressing. The anomalous photovoltaic effect (APV) and photoinduc…
Abstract In x‐ray photoelectron spectroscopy (XPS), knowledge of elemental depth distributions within the first 10 nm is often essential. However, none of the conventional XPS methods can reliably discern, for example, a thin overlayer from clusters on rough surfaces. Therefore, reliable experimental data on the actua…
Abstract Surface analysis based on the interpretation of electron spectroscopy such as x‐ray photoelectron spectroscopy, Auger electron spectroscopy, or reflection electron energy loss spectroscopy are influenced by the inelastic scattering processes that take place when an electron moves in the region near a solid su…
ABSTRACT: The water‐vapor permeability (WVP) and mechanical properties of edible films formed from dry blends or co‐dried preparations of protein‐polysaccharide powders prepared from whey protein concentrate (WPC)‐45 and alginate, pectin, carrageenan, or konjac flour (WPC‐45‐to‐polysaccharide ratio of 95:5 w/w) were i…
Abstract Hollow microspheres are spherically symmetrical particles consisting of at least two phases. Their sales are continuously increasing because of a large number of well‐known and new applications. While most of the current needs for hollow microspheres are met by inorganic byproducts of combustion processes (ce…
Stress‐rupture tests were conducted in air, under vacuum, and in steam‐containing environments to identify the failure modes and degradation mechanisms of a carbon‐fiber‐reinforced silicon carbide (C/SiC) composite at two temperatures, 600° and 1200°C. Stress‐rupture lives in air and steam‐containing environments (50–…
Two cobalt(II) porphyrin-C(60) malonate-linked conjugates, the mono-connected Co1 and the bis-connected trans-2 isomer Co3, have been synthesized for the first time either by direct cyclopropanation with the precursor malonate Co4 or by metalation of the bisadduct H(2)3. For the investigation of the interaction betwee…
Luminescent semiconductor quantum dot (QD)-based optical biosensors have the potential to overcome many of the limitations associated with using conventional organic dyes for biodetection. We have previously demonstrated a hybrid QD-protein-based fluorescence resonance energy transfer (FRET) sensor. Although the QD ac…
Highly organized mesoporous silica monoliths were reproducibly prepared by nanocasting mixtures of fluorinated nonionic surfactants and micelles of two hydrocarbon block copolymers. It is the special feature of this fluorocarbon/hydrocarbon template mixture that they form not mixed micelles but individual micelles ins…
Pyrochlore-group minerals are relatively common accessory constituents of calcite carbonatite at the Oka Carbonatite Complex, Quebec. This complex is a member of the Cretaceous Monteregian petrological province, and consists predominantly of calcite carbonatite and feldspathoidal silicate rocks. Mineralogical studies…
Abstract Bamboo fiber-filled poly(lactic acid) (PLA) eco-composites were prepared by mechano-chemical compositing with bamboo fiber (BF)-esterified maleic anhydride (MA) (BF-e-MA) in the presence of dicumyl peroxide as a radical initiator. Tensile properties of the composites were improved by adding BF-e-MA and the di…
Abstract Polycaprolactone (PCL) has been blended with thermoplastic starch (TPS), prepared from regular corn starch and glycerol, in a twin‐screw extruder. The rheological, mechanical, thermal and morphological properties of the blends were examined. Differential Scanning Calorimetry (DSC) and Scanning Electron Micros…
Abstract The formation of well‐aligned ZnO nanorods has been achieved via H 2 treatment of as‐grown ZnO films. Structural analyses reveal that the ZnO nanorods on the ZnO films are preferentially oriented along the c ‐axis direction and exhibit a single‐crystalline wurtzite structure. To investigate the mechanism of f…
Abstract A series of MCM‐41s with a high copper content were synthesized at room temperature from sodium metasilicate (Na 2 SiO 3 ) as the silicon source, tetraamminecopper( II ) nitrate [Cu(NH 3 ) 4 (NO 3 ) 2 ] as the copper source and cetyltrimethylammonium bromide (CTABr) as the template. The resulting material was…
Abstract We report a Grand Canonical Monte Carlo simulation study of Ar adsorption at 77 K in silica nanopores having various morphologies/topologies. Both the morphological and topological disorders are shown to significantly affect the capillary condensation phenomenon. In the case of an ellipsoidal pore, we observe…
A drop shape analysis technique called Axisymmetric Drop Shape Analysis (ADSA) has been developed in our laboratory over the last twenty years. ADSA is a powerful technique for the measurement of interfacial tensions and contact angles of pendant drops, sessile drops, and bubbles. In essence, it relies on the best fit…
Abstract The creep behavior of composites prepared from woodflour and polypropylene has been analyzed. The woodflour content was varied from 0% to 60%. The compatibility between filler and matrix was varied by adding a non‐commercial polypropylene‐maleic anhydride copolymer (PPMAN) to the mixture. Short‐term and long‐…
Abstract A system based on variation of the octahedrally coordinated cations is proposed for graphical presentation and subdivision of tri- and dioctahedral K micas, which makes use of elemental differences (in a.p.f.u.): (Mg – Li) [= mgli ] and (Fe tot + Mn + Ti – VI Al) [= feal ]. All common true tri- and dioctahedr…
Leakage current produced on contaminated ceramic and polymeric insulating surfaces was analyzed using a wavelet transform technique providing time-frequency domain information. Salt-fog tests with and without the deposition of non-soluble contamination were conducted in a laboratory, during which the leakage current w…