Materials Literature
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Nanoscaled AgxAu1−x (0.2<x<0.8) alloy particles were synthesized by putting gold and silver particles into pores of monolithic mesoporous silica by soaking and annealing method. It has been found that in optical absorption spectrum, the surface plasmon resonance (SPR) maximum of AgxAu1−x alloy particles…
Abstract Control of coalescence is a critical factor in preparing polymer blends with specific morphologies. Coalescence was studied as a function of shear rate, volume fraction, viscosity ratio, and amount of block copolymer in a model system comprising polystyrene (PS) and high density polyethylene (HDPE). Small dro…
R ‐curves, process zones, and shielding stresses of barium titanate (BaTiO 3 ) and partially stabilized zirconia (PSZ) have been studied using compact‐tension (CT) specimens. BaTiO 3 and PSZ exhibited pronounced R ‐curves that rose over similar crack lengths and showed steady‐state toughnesses of 0.7 and 6.4 MPa·m 1/2…
Selected condensation products of aromatic aldehydes and p-phenylenediamine have been synthesized and evaluated as corrosion inhibitors for mild steel (MS) and oil-well steel (N-80) in 15% hydrochloric acid (HCl) at 105°C ± 2°C by the weight loss method. All the condensation products showed excellent performance. 2,4-…
Optical and x-ray scattering studies of a chiral, organosiloxane smectic-A liquid crystal indicate a large field induced optical tilt of up to 31 degrees accompanied by a very small contraction of the smectic layers. This result suggests that the molecules have a nonzero tilt even with no applied field, and that the p…
Multi-resolution signal decomposition (MSD) technique of wavelet transforms has interesting properties of capturing the embedded horizontal, vertical and diagonal variations within an image in a separable form. This feature was exploited to identify individual partial discharge (PD) sources present in multi-source PD…
Suspension bridge cable inspections have revealed severely corroded and broken wires in some main cables. Accelerated, cyclic corrosion studies were conducted to assess the relative effect of general corrosion, corrosion cracking, and hydrogen embrittlement on the deterioration in material properties of high-strength…
Abstract The effects of extrusion and formulation variables on the structure and properties of starch‐polyester laminates were examined. Three‐layer polyester/starch/polyester sheets were prepared using a twin‐screw extruder for the starch/water center layer, a single screw extruder for the outer polyester layers and…
An experimental investigation of methane oxidation in the presence of NO and NO2 has been made in an isothermal plug-flow reactor at 750-1250K. The temperature for on-set of oxidation was lowered by 250 K in the presence of NO or NO2 at residence times of 200 ms. At shorter residence times (140 ms) this enhancement ef…
Abstract The dielectric behavior of kaolinite, montmorillonite, allophane, and imogolite samples adjusted to a water potential of 33 kPa was examined using a time-domain reflectometry method over a wide frequency range of 10 3 -10 10 Hz. A dielectric relaxation peak owing to bound H 2 O was observed. The observation o…
The effects of silica particle diameter on dispersion and aggregation behavior in water were analyzed, using alkoxide‐derived silica powders with particle diameters of 8–260 nm. The present study focused on the relationships between the surface silanol structure and the interaction forces between solid surfaces in wat…
Calorimetric, thermomechanical, and rheological properties of undercooled liquid Pd40Ni40P20 were determined within a wide temperature range above the glass transition. The concept of the limiting fictive temperature was applied to the entire set of measurements to compare the different properties adequately. It was f…
We present a new approach, namely ball milling, to synthesize amorphous boron nitride ( a ‐BN). The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). HRTEM investigations indicate that, in the early…
Paracyclophane derivatives have been prepared that may be considered models of bichromophoric contacts in the solid. The optical properties of these compounds give insight into how bringing two chromophores into close proximity affects the photophysics of the pair. Thus, reaction of 4,7,12,15-tetrabromo[2.2]paracyclop…
The combination of a GaN laser diode and a 0.85 numerical aperture objective has achieved an optical storage capacity of over 22 GB. Owing to sufficient modulation ability and low-noise characteristics, GaN semiconductor lasers possess adequate quality to be light sources in optical recording systems. A bit size of 13…
A simple model for the interfacial free energy of a semicoherent interface is used to develop expressions for interface stresses, which are surface thermodynamic quantities associated with solid–solid interfaces. An analysis of the thermodynamics of thin film epitaxy is presented that incorporates the effects of free…
This paper investigates the performance characteristics of three domestic refrigerators, namely the vapour compression (VC), the thermoelectric (TE) and the absorption refrigeration (AR). AR and TE refrigerators are the result of research and development in refrigeration system in the quest to find a cooling system wh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCobalt on Mesoporous Silica: The First Heterogeneous Pauson−Khand CatalystSang-Wook Kim, Seung Uk Son, Sang Ick Lee, Taeghwan Hyeon, and Young Keun ChungView Author Information Department of Chemistry and Center for Molecular Catalysis and School of Chemical Engineerin…
Polypyrrole (PPy) may be set to revolutionize biological applications such as tissue engineering and biosensors due to its high electroactivity/conductivity and the water compatibility of its films. However, inherent weaknesses in PPy-based materials arise from defect sites along the PPy polymer backbone, and its inst…
A new class of binary mesoporous yttria–zirconia(YZ) and ternary mesoporous metal-YZ materials (M=electroactive Ni/Pt) is presented here (the Figure shows PtYZ) that displays the highest surface area of any known form of yttria-stabilized zirconia. These mesoporous materials form as solid solutions and retain their st…