Materials Literature
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We discuss the depletion interaction between a wall and a mesoscopic particle of ellipsoidal shape induced by long, flexible, nonadsorbing polymer chains. Both a force and a torque are exerted on the particle. We concentrate on the case in which the particle size is much smaller than typical polymer lengths, such as t…
Abstract A highly flexible molecular tweezer, (aqua)(2,6‐bis[(dimethylamino)methyl]‐4‐{3‐[(1‐pyrenyloxy)methyl]‐5‐(trimethylsilyl)benzyloxy}phenyl)palladium( II ) tetrafluoroborate ( 1a ), constructed from a para ‐hydroxy‐functionalized NCN‐pincer palladium( II ) complex {NCN−OH = [2,6‐(Me 2 NCH 2 ) 2 C 6 H 2 ‐4‐OH]},…
We investigate the possibility of forming a tilted smectic liquid crystal phase by suitably positioning two permanent dipoles in a rodlike molecule. We show, using Monte Carlo simulations, that a tilted smectic is formed from ellipsoidal Gay-Berne particles with two off-center outboard dipoles when these are directed…
The effects of mixed fatigue by phase-shifted electrical and mechanical loading on the material properties of a commercial lead–zirconate–titanate ceramic are presented. Both the loss in switchable polarization and strain are more pronounced than in purely unipolar electric, but much less than in bipolar electric fati…
We report on a systematic investigation of the influence of pulsed laser deposition (PLD) parameters upon the microstructure, surface morphology, and magnetic properties of La0.7Sr0.3MnO3 (LSMO) thin films grown on (100) SrTiO3 substrates. The optimization of the physical properties requires a careful exploration of t…
A continuous transition from tilted to homeotropic alignment at an interface is observed at a temperature T(a) for a nematic liquid crystal on cooling toward the nematic-smectic-A phase transition temperature. T(a) is found to depend on the treatment of the substrate. The behavior is examined theoretically in terms of…
Uniformly a-axis-oriented, epitaxially twinned La-substituted Bi4Ti3O12 (BLT) thin films having the major spontaneous polarization entirely along the film normal were grown by pulsed laser deposition on yttria-stabilized zirconia-buffered Si(100) substrates covered with very thin SrRuO3 bottom electrodes. Using SrRuO3…
Composites of nanosized CdS–ZnS core–shell particles well dispersed in polycetyl- p-vinylbenzyldimethylammonium chloride (PCVDAC) were fabricated and their optical properties and morphology were studied. The core-shell particles of less than 10 nm in size were prepared with the reverse micellar solutions formed by a p…
Experiments show that the D bands of bundles of single wall carbon nanotubes have a fine structure, apparently consisting of more than one subband. Using the double resonance theory, we calculate for the first time the D band for a sample of a given diameter distribution for seven different laser excitation energies i…
We report a fabrication method for producing interference-based electro-optic phase gratings that switch between diffracting and transparent states. The phase grating consists of a hexagonal-close-packed array of monodisperse emulsion drops of nematic liquid crystal, embedded in a polymer matrix. Monodisperse droplet…
We report a phase instability in oxygen-plasma-assisted molecular beam epitaxy of Fe3O4 films on sapphire (0001) substrates. Under a wide range of growth conditions, Fe3O4(111) films phase separate, on a nanometer length scale, into Fe3O4, FeO and metallic Fe, which is attributed to formation of the thermodynamically…
Nano-porous carbon doped oxide (CDO) is one of the potential low dielectric constant (low-k) materials that can achieve a dielectric constant as low as 2.2 and is expected to be suitable for the next generation multilevel interconnection. However, the electrical stability of CDO in contact with metal has not been addr…
Electromigration during accelerated testing can induce plastic deformation in apparently undamaged Al interconnect lines as recently revealed by white beam scanning x-ray microdiffraction. In the present article, we provide a first quantitative analysis of the dislocation structure generated in individual micron-sized…
Zeolites--crystalline aluminosilicates with a microporous structure--are used extensively in catalysis and for separations. Most efforts directed at modifying their frameworks with organic molecules have added pendant groups that tend to block their micropores. Jones highlights a paper ( Yamamoto et al.) that describe…
The effect of ion implantation including ion species (N2+ and C3H8+) and the fluences (1×1014–5×1015 ions/cm2) on the surface energy of ultrahigh molecular weight polyethylene (UHMWPE) were investigated. The total surface energy increases significantly after implanting with the fluence of 1×1014 ions/cm2 regardless of…
It is shown that open-cell metallic foams having very low density, and that display martensite transformations required for shape memory and superelastic behavior, can be fabricated using a powder-metallurgy technique. Results are presented on experiments in which a polymeric precursor foam was coated with an equiatom…
Geometric and electronic environments of vanadium have been addressed by (51)V magic angle spinning NMR spectroscopy of six-coordinated polyoxometalate solids. (C(4)H(9))(4)N(+) and mixed Na(+)/Cs(+) salts of the Lindqvist-type mono- and divanadium-substituted oxotungstates, [VW(5)O(19)](3-) and [V(2)W(4)O(19)](4-), h…
The effect of the Ga/N flux ratio on the Mn incorporation, surface morphology, and lattice polarity during growth by rf molecular beam epitaxy of (Ga,Mn)N at a sample temperature of 550 °C is presented. Three regimes of growth, N-rich, metal-rich, and Ga-rich, are clearly distinguished by reflection high-energy electr…
Freezing of a Lennard-Jones fluid between solid surfaces was studied using grand canonical Monte Carlo and molecular dynamics simulations. We explored the formation of frozen phases of hexagonal and orthorhombic symmetry in mono-, bi-, and tri-layer structures. The freezing transition, the type of lattice, and transla…
This article concerns the unusual storage mechanism in the x-ray storage phosphor CsBr:Eu2+. Data are presented and discussed regarding the identification of x-ray diffraction patterns and the photostimulated luminescence (PSL) intensity as a function of the annealing temperature for various Eu concentrations of CsBr:…