Materials Literature
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We present results for physical aging of films made from a high free volume polymer (poly[1-(trimethylsilyl)-1-propyne], PTMSP). Aging was tracked by gas permeation measurements of He and N 2 . The intermediate and thin films (3 and 1 μm) showed a rapid loss of gas permeability with time while the thick film (85 μm) s…
A quasi-one-dimensional (quasi-1D) Au nanocolloids array has been fabricated on silicon by combining the techniques of atomic force microscopy (AFM)-based nanooxidation and chemical assembling of colloidal nanoparticles. The silicon substrate, modified with an octadecyltrichlorosilane (OTS) monolayer, was first subjec…
Single-walled carbon nanotubes were studied by (13)C nuclear magnetic resonance (NMR). Two types of (13)C nuclear spins were identified with different spin-lattice relaxation rates. The fast-relaxing component, assigned to metallic tubes, followed the relaxation behavior expected in metals, and the density-of-states a…
A perturbative study of the Holstein Molecular Crystal Model which accounts for lattice structure and dimensionality effects is presented. Antiadiabatic conditions peculiar of narrow band materials and an intermediate to strong electron-phonon coupling are assumed. The polaron effective mass depends crucially in all d…
By carrying out Monte Carlo simulations based on the two-species atomic-scale kinetic growth model of GaAs(001) homoepitaxy and comparing the results with scanning tunneling microscope images, we show that initial growing islands undergo the structural transformation before adopting the proper beta2(2x4) reconstructio…
Rare-earth-containing metallomesogens with 4-alkoxy- N -alkyl-2-hydroxybenzaldimine ligands are reported. The stoichiometry of the complexes is [Ln(LH) 3 (NO 3 ) 3 ], where Ln is the trivalent rare-earth ion (Y, La, and Pr to Lu, except Pm) and LH is the Schiff base. The Schiff base ligands are in the zwitterionic for…
Titanium dioxide (TiO 2 ) nanocrystals are prepared by a hydrolysis process of tetrabutyl titanate. Nanocrystal samples with various sizes of 6.8-27.9 nm are obtained after annealing from 100 to 650 °C. The crystal structures and the average particle sizes are examined using x-ray diffraction. Raman scattering was emp…
Junctions consisting of two crossed single-walled carbon nanotubes were fabricated with electrical contacts at each end of each nanotube. The individual nanotubes were identified as metallic (M) or semiconducting (S), based on their two-terminal conductances; MM, MS, and SS four-terminal devices were studied. The MM a…
An electron in a solid, that is, bound to or nearly localized on the specific atomic site, has three attributes: charge, spin, and orbital. The orbital represents the shape of the electron cloud in solid. In transition-metal oxides with anisotropic-shaped d-orbital electrons, the Coulomb interaction between the electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiarylethenes for Memories and SwitchesMasahiro IrieView Author Information Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, and CREST, Japan Science and Technology Corporation (JST), Hakozaki 6-10-1, Higashi-ku, Fukuoka 812, Japan…
The crystal structure of diacetato(N-methyl-meso-tetraphenylporphyrinato)thallium(III), Tl(N-Me-tpp)(OAc)2 (1), was established, and the coordination sphere around the Tl3+ ion is described as an eight-coordinate square-based antiprism in which two cis chelating bidentate OAc- groups occupy two apical sites. The plane…
An equation for predicting the diffusion coefficients of hydrocarbons in polyolefins is developed. The calculated values are compared with experimental results obtained with n-paraffins and organic compounds of different polarities and structures. The possibilities and limitations of the model are discussed in the lig…
Mononuclear transition metal complexes of the type [M(2,6-NITpy)2](ClO4)2 x solvent (2,6-NITpy = 2,6-bis-(3'-oxide-1'-oxyl-4',4',5',5'-tetramethylimidazolin-2'-yl)pyridine; M = Ni (1), Co (2), Zn (3), Mn (4), Cu (5)) have been synthesized and characterized by single-crystal X-ray diffraction studies. Crystal data: 1,…
Through-tool coolant was applied to the drilling of an aluminum/SiC MMC. Titanium nitride coated, solid carbide drills were used to investigate the effect of the coolant application method on the performance of the drilling operation. Holes were produced dry, with conventional coolant and with through-the tool coolant…
In order to investigate the electronic characteristics of ferroelectric thin films that behave as semiconductors, we derive an equation to calculate the band bending in ferroelectrics, to replace the Poisson equation. We find that the space-charge density term, , in the Poisson equation should be replaced by - P r , w…
Antimicrobial additives can be successfully incorporated into food packaging films or film coatings. However, several factors affect their effectiveness for inhibition of spoilage or pathogenic microorganisms. Nisin was coated onto low density polyethylene film using a cellulose based coating. It inhibited growth of S…
This article examines the separation of lysozyme from chicken egg white by ultrafiltration with 25 kDa and 50 kDa MWCO polysulfone membranes. The effects of pH, system hydrodynamics, feed concentration, and transmembrane pressure on permeate flux, lysozyme transmission, purification factor, and productivity have been…
Poly(propylene imine) dendrimers have been functionalized with π-conjugated oligo( p -phenylene vinylene)s (OPV's) through an amide linkage and are fully characterized. In solution the dendrimers behave as globular entities without specific interactions between the OPV units. The OPV dendrimers have an amphiphilic nat…
The calculations are performed for a broad range of the properties of Ca and Sr in the fcc and bcc phases. A detailed information on the magnitude and character of temperature dependence of anharmonic effects in the lattice dynamics over the entire Brillouin zone (frequency shifts and phonon damping, Gruneisen paramet…
For the single-wall carbon nanotubes conducting in the simplest tight binding model, the complete set of line group symmetry based quantum numbers for the bands crossing at Fermi level are given. Besides linear (k), helical (k'} and angular momenta, emerging from roto-translational symmetries, the parities of U axis a…