Materials Literature
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The process of wetting of a monodisperse foam by the continuous addition of liquid from the top has been investigated for a cylindrical column. The velocity of the interface between dry and wet foam was found to vary as the square root of the rate of addition of liquid. Evidence of a structural transformation was foun…
Magnetic resonance and calorimetric studies of 4'-n-pentyl-4-cyanobiphenyl confined to Vycor glass, a random network of pores with average diameter \ensuremath{\sim}70 \AA{}, are reported. Under such severely constrained ocnditions, the nematic-to-isotropic transition is replaced by a continuous evolution of orientati…
The dark current in commercial polypropylene (PP) is measured at temperatures ranging from 333 to 413 K and fields ranging from 70 to 125 kV/cm. The specimens are metallized on both sides by evaporated layers of silver and aluminium. An attempt is made to identify the nature of the current by comparing its observed de…
Electrochromic MnOx thin films are prepared by using an electron beam technique followed by annealing post-treatment. Electrochromic properties of the films are studied in three different solutions: 1M LiClO4 in propylene carbonate, KOH (pH = 10.5), and natrium borate (pH = 9.2). The transmittance spectra of the colou…
During the four decades from 1930 to 1970, seven photocathodes having useful sensitivity to visible light were developed. The first six have two features in common: First, they were all based on lucky observations, rather than on scientific principles. Second, despite a great deal of systematic research it is still no…
The copper and nickel complexes of 2,3,7,8,12,13,17, 18-octabromo-5,10,15,20-tetrakis(pentaftuorophenyl) \nporphyrin ({4,5,9,10,14,15,19,20-octabromo-2,7,12,17-tetrakis(pentaftuorophenyl)-21,22,23,24-tetraazapentacyclo[l6.2.1.1^(3,6).l^(8,11).l^(13,16)]tetracosa-l,3-(22),4,6,8(23),9,11,13(24),14,16,18(21),19-dodec…
A study was made of the structure and magnetic properties of Fe-Co alloy films produced by dc magnetron sputtering at an oblique angle of incidence. The films obtained in this manner showed uniaxial magnetic anisotropy in the film plane, with an easy axis of magnetization perpendicular to the incident direction of the…
CdS microcrystals under weak confinement conditions embedded in a polyvinyl alcohol polymer film have been optically characterized by linear absorption and time-resolved luminescence spectroscopy. They are studied in the presence of an external electrical field at low and room temperature and different densities of ph…
We discuss the reorientation of a cylindrically symmetric probe in a biaxial orthorombic medium, such as a biaxial nematic. We write down and solve for the first time the rotational diffusion equation for a rod-like or disc-like uniaxial probe reorienting in a medium of biaxial symmetry. We calculate first and second…
Abstract A model based on the polymer solution theory of Flory and Rehner is presented for estimating the solubility of organic solvents in chemical protective clothing (CPC) polymers using three‐dimensional (3‐D) solubility parameters. Immersion test solubility values of 40 organic solvents in commercial Viton® glove…
Optical properties are reported for cationic K clusters incorporated into the \ensuremath{\alpha} cage of K-form LTA. The \ensuremath{\alpha} cage has an inside diameter of \ensuremath{\sim}11 \AA{} and is arrayed in a simple cubic structure. The loading density of potassium is systematically changed from dilute to sa…
The several processes required to achieve Er luminescence in Si are investigated. In particular, the role of Er-O interactions to obtain the incorporation of high Er concentrations, electrically and optically active, in crystalline Si is addressed. Multiple Er and O implants were performed on n-type (100) Si crystals…
The positions of sulfur atoms adsorbed on GaAs(111)A and GaAs(111)B surfaces are determined by x-ray standing-wave (XSW) triangulation studies. On the GaAs(111)A surface, which is Ga terminated, sulfur atoms are on top of the first-layer Ga atoms, at the so-called T sites. On the GaAs(111)B surface, which is As termin…
Direct observation of superplastic deformation in shear in a scanning electron microscope in Pb-62% Sn eutectic alloy at different microstructural levels were performed. The sliding of grains as an entity was observed. Such cooperative grain-boundary sliding proceeds by means of the sequential shear of grains along sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetry/gas chromatography/mass spectrometry and thermogravimetry/gas chromatography/Fourier transform infrared spectroscopy: Novel hyphenated methods in thermal analysisWilliam H. McClennen, Richard M. Buchanan, Neil S. Arnold, Jacek P. Dworzanski, and Henk L. C. M…
We report multireference configuration-interaction calculations for the lowest potential energy surfaces of the B(2s22p 2P)...H2 van der Waals molecule. The degeneracy of the 2p orbital implies that there exist three adiabatic potential energy surfaces (two of A′ symmetry and one of A″ symmetry in Cs geometry) which b…
Probability distributions are evaluated for electromigration induced open failures in narrow, passivated interconnects with a near-bamboo grain structure. Void formation is initiated at the cathode ends of the polycrystalline line segments or ‘‘grain clusters.’’ If these clusters are longer than a critical size Lc, th…
Recent observation of efficient light emission from porous silicon has attracted much attention and renewed interests in the study of nonlinear optical properties of nanometer-sized quantum systems. In this paper, we study the third-order nonlinear optical susceptibility of semiconductor quantum wires. The quantum wir…
We show in this paper that measurements of charge-state distributions for 5--1600 eV Li, Na, and K scattered from a clean Cu(001) surface provide an excellent probe of the dynamics of atom-surface charge transfer. The neutralization probabilities, measured as a function of the perpendicular velocities of the scattered…
We report detailed measurements of the electrical resistivity, Seebeck coefficient, and differential scanning calorimetry across the metal-insulator (MI) transition ( T MI ≊205 K) of NdNiO 3 . As in the isostructural oxide PrNiO 3 , the transition is extremely hysteretic, consistent with the first-order character of t…