Materials Literature
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This paper describes new findings of an investigation of thermally-activated core–shell reactivities of nanoparticles in solutions for processing size, shape and surface properties. Gold nanoparticles of ≈2 nm core sizes with thiolate monolayer encapsulation were chosen as a model system for the manipulation of reacti…
The heterogeneous interaction of NO2 on decane and hexane soot generated in the laboratory was examined in a Knudsen reactor. Two different types of soot were produced using both fuels: Soot originating from a rich flame at a high fuel/oxygen ratio (‘grey’ soot) and soot generated from a lean flame at a low fuel/oxyge…
The present work provides improved recycled high molecular weight poly(ethylene terephthalate) (PET) by chain extension using 2,2′-(1,4-phenylene)bis(2-oxazoline) (PBO) as the chain extender. PBO is a very reactive compound toward macromolecules containing carboxyl end groups but not hydroxyl end groups. In the case o…
The aromatic steroid equilenin acetate undergoes regioselective and stereoselective hydroxylation and amidation catalyzed by a manganese porphyrin using iodosobenzene (PhIO) and N-tosyliminophenyliodinane (PhINTs) as the oxygen and nitrogen donor, respectively.
Biodegradable composites based on treated and untreated sisal fiber and mater Bi-Z were processed using an internal batch mixer. The effect of processing conditions (temperature, speed of rotation, and time of mixing) and alkaline treatment on the dimensions of sisal fiber was studied. The length and diameter of the i…
The role of solid-state thermal degradation kinetics in steady-flaming combustion is examined. Expressions for the burning surface temperature, pyrolysis zone depth and fractional mass loss rate are derived from heat transport limited, nonisothermal pyrolysis kinetics. The predicted magnitude of these fire response pa…
Five unsymmetrically meso-substituted corroles have been synthesized from dipyrromethanes and aldehydes in yields of up to 19% via a new two-step one-flask procedure.
Recently efficient blue‐white luminescence from Sr 2 CeO 4 was reported. The emission was assigned to a ligand‐to‐metal charge‐ transfer transition of Ce 4 + . Charge transfer (CT) emission from Ce 4 + , or any other tetravalent lanthanide, had not been reported previously. Here, further research on the luminescence o…
Polycrystalline hexagonal ferrites (Y, Z and W-phases) were prepared by the usual ceramic sintering. Their complex permeability spectra were natural resonance type, and numerically separated into spin rotational and domain wall motion components. For the spin rotational component, it was found that the Snoek's product…
A multifunctional epoxy resin has been demonstrated to be an efficient reactive compatibilizer for the incompatible and immiscible blends of polyamide-6 (PA 6) and polybutylene terephthalate (PBT). The torque measurements give indirect evidence that the reaction between PA and PBT with epoxy has an opportunity to prod…
As the Rp of ion implants steadily decreases an ever-increasing percentage of the implant species lies in the oxide layer and is, therefore, not electrically active. For this reason, it is important to have analytical techniques capable of accurately measuring the thickness of ultrathin oxide layers. A round-robin stu…
Excellent enantioselectivity (e.g. 92% ee for 2,2-dimethylchromene) has been achieved in heterogeneous asymmetric epoxidation using a polymer-bound (pyrrolidine salen)-manganese(III) complex; however, this polymeric catalyst underwent partial decomposition under epoxidation conditions.
Supercapacitors are devices for applications requiring high operating power levels, such as secondary power sources in electric vehicles (EVs) to provide peak power for acceleration and hill climbing. While electronically conducting polymers yield different redox supercapacitor configurations, devices with the n‐doped…
An analytical high-resolution TEM study was carried out for gold deposited on TiO2 (anatase and rutile) to obtain a structural insight into the unique catalytic properties of the system. Preferred orientations between Au particles and the TiO2 support were often observed and a model for the epitaxial orientation betwe…
We address some properties of a scalar two-dimensional model that has been proposed to describe microstructure in martensitic phase transformations, consisting of minimizing the bulk energy where |uy| = 1 a.e. and u(0,·) = 0. Kohn and Müller [R. V. Kohn and S. Müller, Comm. Pure and Appl. Math. 47 (1994), 405] proved…
β-Cyclodextrin (β-CD) was coupled to chitosan by the intermediate of its monochlorotriazinyl derivative, called βW7MCT, so that a chitosan derivative bearing cyclodextrin was obtained. Because the average degree of substitution of the cyclodextrin derivative was 2.8, the reaction yielded crosslinked insoluble products…
The structure of the metal-oxide interface and its effect on the stability of the corrosion layers, hydrogen uptake, and the global oxidation kinetics are studied using a systematic multi-scale characterization of the oxide layers formed on autoclaved Zircaloy-4 samples. The multi-scale approach made use of complement…
Accurate and simple measurements of the thermal conductivity of thin films deposited on high thermal conductivity substrates have been recently enabled by the development of an AC hot-wire method, the 3ω method. Recent progress in the measurement and understanding of heat transport in ultra-thin films (1 μm thick) and…
A square-shaped π-conjugated porphyrin tetramer has prepared: the excitation energies of both the Soret and Q bands, 19880 (503) and 15180 cm−1 (659 nm), respectively, are quite low compared with those for the monomer and reported cyclic porphyrin oligomers.
Amorphous calcium carbonate is formed by a surprisingly large number of organisms, bearing in mind how unstable it is. Organisms use amorphous calcium carbonate as temporary storage sites for ions, as precursor phases that transform into more stable crystalline calcium carbonate polymorphs, or in a stabilized form for…