Materials Literature
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The principal theme of this paper is that anomalously slow, super-Arrhenius relaxations in glassy materials may be activated processes involving chains of molecular displacements. As pointed out in a preceding paper with Lemaitre, the entropy of critically long excitation chains can enable them to grow without bound,…
Tremendous changes of the structure of Rh particles occurred during partial methane oxidation to hydrogen and carbon monoxide over a 2.5 wt % Rh/Al(2)O(3) catalyst upon ignition of the catalytic reaction. Furthermore, near the ignition temperature a variation in the Rh-valence state along the catalyst bed was observed…
We have developed a simple method to fabricate a gradient from superhydrophobicity to superhydrophilicity. It is based on the controlled self-assembled monolayer consisting of a thiol molecule on a gold surface and the amplifying effect of the wetting property on a rough surface. Using a relatively dilute HS(CH2)11CH3…
We report on the fabrication and electroluminescence of an n-ZnO nanorod/p-Si heterojunction. ZnO nanorods were grown on p-type Si substrates employing an easy low-temperature aqueous solution method. As-grown ZnO nanorods showed good crystallinity and a preferable c axial orientation. Electroluminescent devices were…
▪ Abstract Hydrogen strongly affects the properties of electronic materials. Interstitial monatomic hydrogen is always electrically active and usually counteracts the prevailing conductivity of the semiconductor. In some materials, however, hydrogen acts as a source of doping. We describe the mechanisms that govern in…
Tetradentate Schiff base ligands H2L (H2saltmen, H2salen, H2-5-Brsalen, and H2-3,5-Brsalen), derived from the condensation of the corresponding salicylaldehyde or its derivatives with 1,1,2,2-tetramethylethyldiamine or 1, 2-diaminoethane, reacted with Mn(III) acetate or perchlorate salts and sodium azide or sodium cya…
The problem studied in this paper is to obtain the equations describing sound propagation in a consolidated porous medium filled with superfluid, determine the elastic coefficients, appearing in the equations, in terms of physically measurable quantities, and calculate the propagation velocities of transverse and long…
We develop an explicit and tractable representation of a twist-grain-boundary phase of a smectic-A liquid crystal. This allows us to calculate the interaction energy between grain boundaries and the relative contributions from the bending and compression deformations. We discuss the special stability of the pi/2 grain…
Co3O4 nanoboxes (see figure), prepared by a template-synthesis process and composed of compactly assembled cuboid Co3O4 nanocrystals, are reported. Heterogeneous nucleation and interparticle coarsening growth of the nanocrystals is proposed as the formation mechanism. These nanoboxes are characterized by their unexpec…
A shining example: We report a facile strategy to synthesize highly luminescent, water-soluble, and biocompatible CdTe nanocrystals by using the biomolecule glutathione as a stabilizer. The highest quantum yield obtained was above 60 % and their size-dependent emission ranged from 480 to 650 nm. The nanocrystals could…
Quantum well structured CdSe nanoribbons with uniform and ultrathin thickness of 1.4 nm were synthesized from the low-temperature reaction of CdCl2 and ammonium selenocarbamate. The CdSe nanoribbons exhibited an extremely narrow photoluminescence band with fwhm of 70 meV.
Hydrides of period 2 and 3 elements are promising candidates for hydrogen storage but typically have heats of reaction that are too high to be of use for fuel cell vehicles. Recent experimental work has focused on destabilizing metal hydrides through alloying with other elements. A very large number of possible destab…
▪ Abstract Miniemulsions are specially formulated heterophase systems in which stable nanodroplets of one phase are dispersed in a second, continuous phase. Because each of the nanodroplets can be regarded as a nanoscopic, individual batch reactor, a whole variety of reactions and processes resulting in both organic a…
Polydimethylsiloxane-based self-healing is achieved through the tin-catalyzed polycondensation of phase-separated droplets. The catalyst is released into the crack plane when microcapsules containing a tin compound are ruptured by the advancing crack (see figure). This system greatly extends the capability of self-hea…
▪ Abstract Metal-hydrogen (M-H) systems are interesting from both a theoretical and a practical point of view. M-H systems are utilized for energy-storage systems, in sensor applications, and in catalysis. These systems are often exploited as models for studying basic material properties, especially when the size of t…
▪ Abstract Nanostructured fibrous materials have been made more readily available in large part owing to recent advances in electrospinning and related technologies, including the use of electrostatic or gas-blowing forces as well as a combination of both forces. The nonwoven structure has unique features, including i…
By far the largest proportion of the Earth's biosphere is comprised of organisms that thrive in cold environments (psychrophiles). Their ability to proliferate in the cold is predicated on a capacity to synthesize cold-adapted enzymes. These enzymes have evolved a range of structural features that confer a high level…
Biogenic gold nanotriangles and spherical silver nanoparticles were synthesized by a simple procedure using Aloe vera leaf extract as the reducing agent. This procedure offers control over the size of the gold nanotriangle and thereby a handle to tune their optical properties, particularly the position of the longitud…
TTHA0727 is a conserved hypothetical protein from Thermus thermophilus HB8, with a molecular mass of 12.6 kDa. TTHA0727 belongs to the carboxymuconolactone decarboxylase (CMD) family (Pfam 02627). A sequence comparison with its homologs suggested that TTHA0727 is a distinct protein from alkylhydroperoxidase AhpD and g…
Recently, new ferroelectrets were developed from foams of polyethylene terephthalate and of cyclo-olefin polymers and copolymers. Here, we focus on ferroelectret films based on compounds of cyclo-olefin polymers. Suitable compounding and preparation led to cyclo-olefin polymer ferroelectrets which show an electromecha…