Materials Literature
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We have developed a device based upon the concept of two-photon up-conversion to use a part of the IR photons otherwise lost by transparency in a GaAs cell. An ultra thin GaAs cell has been fabricated using the technique of epitaxial lift-off (ELO). This thin cell is placed on top of a 100 µ m thick vitroceramic doped…
Electrochemical studies were performed on LaNi 5 − x Sn x with 0 ⩽ x ⩽ 0.5 . We measured the effect of the Sn substituent on the kinetics of charge‐transfer and diffusion during hydrogen absorption and desorption, and the cyclic lifetimes of LaNi 5 − ‐ x Sn x electrodes in 250 mAh laboratory test cells. We report bene…
Homologous compounds of (ZnO) m In 2 O 3 (m = integer) with layered structures were synthesized by reaction‐sintering a mixed powder of ZnO and In 2 O 3 at 1823 K for 2 h in air, and their thermoelectric properties, i.e., electrical conductivity, Seebeck coefficient, and thermal conductivity, were measured at 500 to 1…
Abstract Shewanella putrefaciens is a species of metal-reducing bacteria with a versatile respiratory metabolism. This study reports that S. putrefaciens strain MR-1 rapidly reduces Fe(III) within smectite clay minerals. Up to 15% of the structural Fe within ferruginous smectite (sample SWa-1, Source Clays Repository…
Summary The impact of corrosion on the oil industry has been viewed in terms of its effect on both capital and operational expenditures (CAPEX and OPEX) and health, safety, and the environment (HSE). To fight against the high cost and the impact of corrosion within the oil industry, an overview of topical research and…
Zero-field–cooled magnetization, magnetic relaxation, and a.c. susceptibility measurements have been performed on a Mn 12 -Ac oriented powdered sample as a function of temperature, field, and orientation. Magnetization jumps and susceptibility peaks have been observed about magnetic-field values B n = nB 1 , where B 1…
Isotropic nanocrystalline exchange coupled FeNdB magnets with enhanced remanence were produced using the melt spinning procedure. Starting from nearly single phase Fe14Nd2B magnets, the content of additional α-Fe in composite magnets was stepwise increased up to 40 vol % by reducing the Nd and B content. The maximum r…
Preliminary leaching of rice husks with a solution of hydrochloric acid before their combustion at 600°C is shown to be required to obtain relatively pure silica (∼99.5%) with a high specific surface area (∼260 m 2 /g) that is maintained even after heating at 800°C. Transmission electron microscopy observations indica…
Heat transfer around nanometer-scale particles plays an important role in a number of contemporary technologies such as nanofabrication and diagnosis. The prevailing method for modeling thermal phenomena involving nanoparticles is based on the Fourier heat conduction theory. This work questions the applicability of th…
The DOS program VALENCE is designed to calculate bond valences from bond lengths and vice versa. It can also calculate bond-valence sums and average bond lengths, and can determine bond-valence parameters from the bonding environments of different cations.
The thermomechanical properties of a thin film of shape memory polymer of polyurethane series were investigated experimentally. Based on the experimental results, the dynamic mechanical properties, cyclic deformation properties at high temperature, thermomechanical cycling properties, creep and stress relaxation are d…
A dielectric and ultrasonic study of phase transitions in ${\mathrm{Sr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ba}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ with x ranging from 0.0 to 1.0, is reported. Both ceramic samples and single crystals were studied. The full phase diagram is derived from dielectric measuremen…
Abstract Cellulose microcrystals with dimensions of ∼5 nm × 150–300 nm were obtained from wheat straw. To evaluate the reinforcing effect of these fillers within a thermoplastic matrix, composites with a weight fraction of cellulose ranging from O to 30 wt% were processed by freeze‐drying and molding a mixture of aque…
Biological recognition mediates cell and tissue interactions with biomaterials, be the materials employed in a biotechnical environment in vitro or a biomedical environment in vivo. These interactions are typically mediated by proteins that have adsorbed to the biomaterial surface. The principles of protein adsorption…
Ultrathin films of graphite–polymer composites , which are required for sensors applications, are the target of the work reported here. The preparation and characterization of ultrathin films composed of self‐assembled graphite oxide (GO) platelets and polyelectrolytes are described, followed by the in situ reduction…
The field of block copolymer dynamics is reviewed with regard to both theoretical and experimental developments. Topics covered include collective- and self-diffusion, linear viscoelastic properties, and nonlinear rheology and microstructural development. We provide a current assessment of progress in the field.
We report the results of an investigation into the grain-size dependence of lattice structure for barium titanate (${\mathrm{BaTiO}}_{3}$) ceramics prepared by a sol-gel method. Raman and infrared spectroscopy, x-ray diffraction, and differential scanning calorimetry were used in combination with electron microscopy t…
A green emitting SrAl 2 O 4 : Eu 2 + , Dy 3 + phosphor with very bright and long lasting phosphorescence has been newly developed. The incorporation of Dy 3 + ion into the SrAl 2 O 4 : Eu 2 + system as an auxiliary activator dominates the phosphorescence, thermoluminescence, and photoconductivity characteristics of th…
The results of studies in recent years on the synthesis of polyimides with chains which are both flexible and rigid to the maximum extent are surveyed. The characteristic features of the formation of these polymers, their properties, and certain aspects of their practical applications are considered. It is shown that…
Poly(aryl ether phthalazine)s were found to undergo an exothermic reaction at a temperature range of 360–440°C. We elucidated the origin of the exothermic reaction and the physiochemical phenomena associated with it, based on thermal analyses, model compound studies, and 13C solid-state NMR studies. At elevated temper…