Materials Literature
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The electrochemical properties of individual multiwall carbon nanotubes (MWNTs) coated with an amorphous carbon layer are reported. MWNTs were etched at potentials more positive than 1.7 V vs. Ag/AgCl (3 M NaCl) in an aqueous 0.1 M KCl electrolyte solution. The logarithm of etching rate was proportional to the applied…
Abstract The mechanical and dynamic mechanical properties of thermoplastic polyurethane (TPU) elastomers reinforced with two types of aramid short fibers, m ‐aramid (Teijin‐Conex) and copoly( p ‐aramid) (Technora), were investigated in this study with respect to the fiber loading. In general, both types of composites…
The rate of addition of the internal phase influences the catastrophic inversion of emulsions in the direction of change from abnormal to normal morphology. At a low addition rate, the inversion takes place after a small amount of the internal phase is added, and it happens through the occurrence of multiple emulsion…
The stirring intensity has a complex effect on the catastrophic inversion of emulsions in the direction of change from abnormal to normal morphology. At both low and high stirring energy, the inversion takes place early, after a low amount of the internal phase is added and through the occurrence of a multiple emulsio…
The adsorption properties of various water-soluble aromatic molecules (p-nitrophenol, p-nitroaniline, m-nitrophenol, p-chlorophenol and phenol), with CD-HMS, a new class of cyclodextrin-containing materials with uniform framework mesoporosity, has been investigated. The adsorption isotherms, uptake kinetics and distri…
Alternating electrostatic deposition of poly(amic acid) salts and poly (allylamine hydrochloride) (PAH) followed by heat-induced imidization yields ultrathin, gas-selective polyimide membranes on porous alumina supports. These membranes are appealing because of the stability and selectivity of polyimides and the fact…
The feasibility of ultrasound-induced in situ radical formation in liquid carbon dioxide was demonstrated. The required threshold pressure for cavitation could be exceeded at a relatively low acoustic intensity, as the high vapor pressure of CO2 counteracts the hydrostatic pressure. With the use of a dynamic bubble mo…
Polymer/carbon nanotube films have been formed by the alternate adsorption of the polyelectrolyte poly(diallyldimethylammonium chloride) and single walled carbon nanotubes (SWNT) onto substrates. Atomic force and scanning electron microscopies indicated that the adsorbed SWNTs were mostly in the form of 5−10 nm bundle…
To help understand and predict nanotube interactions, the electrostatic potentials on both the outer and the inner surfaces of 10 single-walled model systems have been computed at the Hartree−Fock STO-5G//STO-3G level. All structures were optimized computationally. Both carbon and boron/nitrogen tubes were studied, in…
Copper thiocyanate compounds with three different oxidation states, Cu(I)(admtrz)SCN (1), [Cu(I)(2)Cu(II)(admtrz)(6)(SCN)(2)](ClO(4))(2) (2), and [Cu(II)(3)(admtrz)(4)(SCN)(3)(mu(3)-OH)(H(2)O)](ClO(4))(2).H(2)O (3), have been synthesized and characterized (admtrz = 4-amino-3,5-dimethyl-1,2,4-triazole). Compounds 1 and…
Magnetic relaxation in molecular magnets under a sweeping field is studied by taking into account local stray fields. It is found that the randomness of local stray field leads to a distribution of the relaxation rate which subsequently makes the relaxation deviate from the exponential law as predicted by the Landau-Z…
Spatially resolved measurements of quasi-ballistic precessional magnetic switching in a microstructure are presented. Crossing current wires allow detailed study of the precessional switching induced by coincident longitudinal and transverse magnetic field pulses. Though the response is initially spatially uniform, de…
Band structure and optical properties of defect- Chalcopyrite type semiconductor ZnIn$_2$Te$_4$ have been studied by TB-LMTO first principle technique. The optical absorption calculation suggest that ZnIn$_2$Te$_4$ is a direct-gap semiconductor having a band gap of 1.40 eV., which confirms the experimentally measured…
Coaxial Zn/ZnO nanocables and ZnO nanotubes have been fabricated via a thermal reduction route using ZnS powder as the source material. The samples were characterized using X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectrometry. The as-synthes…
Abstract The French company Snecma Moteurs is a leading producer of high‐performance composites for operation under high mechanical stress and at high temperature, such as in jet engines, aircraft brake disks, or even rocket propulsion systems. The author presents the different families and generations of carbon‐carbo…
General aspects enzymes as proteins enzymes in foods (endogenous and exogenous) immobilized enzymes and their applications enzymes in food analysis mechanisms of action groups of enzymes and specific enzymes utilization in foods reaction(s)catalyzed classification according to enzyme committee nomenclature properties…
Trivalent-rare-earth ion-doped Y2O3 nanocrystals have been synthesized, and their photoluminescence properties have been studied under 980 nm laser diode excitation. The crystallite size estimated by x-ray diffractometry and scanning electron microscopy was about 30–40 nm. In Yb3+ and Tm3+ codoped Y2O3 nanocrystals, t…
The advantages of mullite ceramic for thin-film application are examined. Using homogeneous powder, a dense mullite substrate consisting of fine mullite grains was provided without the addition of a sintering aid. The properties obtained are superior to those of the mullite presented by M. Horiuchi et al. (1988) and a…
A simple one-step plasma-enhanced chemical vapor deposition of TEOS (PETEOS) deposition process for submicron multilevel metallization has been developed. The effect of deposition conditions on PETEOS step coverage and deposition profile is investigated. Two new processes are demonstrated which meet the step coverage…
The effect on electromigration open-circuit failure of the addition of a small amount of titanium into copper interconnects is investigated. Mean time to failure (MTF) increased with increasing Ti concentration up to somewhere around 0.4 wt.% and decreased sharply by further addition of Ti, while the resistivity of Cu…