Materials Literature
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We investigate the influence of tube-tube interactions in ropes of (10,10) carbon nanotubes, and find that these effects induce a pseudogap in the density of states (DOS) of the rope of width 0.1 eV at the Fermi level. In an isolated $(n,n)$ carbon nanotube there are two bands that cross in a linear fashion at the Fer…
We report observation of coherent quantum oscillations in spin-10 Fe 8 molecular clusters. The powder of magnetically oriented Fe 8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MH…
The structure of lamellar phases of symmetric AB diblock copolymers in a thin film is investigated. We quantitatively compare the composition profiles and profiles of individual segments in self-consistent field calculations with Monte Carlo simulations in the bond fluctuation model for chain length N=32 and χN=30. Th…
Electron paramagnetic resonance was measured in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{A}\mathrm{s}/\mathrm{G}\mathrm{a}\mathrm{A}\mathrm{s}$ epilayers with $0.002<~x<~0.01.$ Data were taken as a function of magnetic field orientation at low temperatures. The observed spectra were attributed t…
Structural and optical properties of photocrystallized Se films have been studied using x-ray diffraction (XRD), spectroscopic ellipsometry (SE), and ex situ atomic force microscopy (AFM) techniques. The amorphous $(a\ensuremath{-})$ Se films used are deposited by vacuum evaporation on glass substrates at 300 K. Photo…
The action spectra for the photoinduced insulator-metal transition in ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ were investigated in the $0.45\ensuremath{-}3.05 \mathrm{eV}$ range. The photon-density threshold for the transition exhibits a gaplike behavior at $\ensuremath{\sim}0.4 \mathrm{e…
The hydrogen bonds in films of the polyurethane and the core-shell type polyacrylate-polyurethane microemulsions have been studied by FTIR spectroscopy in the regions of NH absorption and CO absorption. The effects on hydrogen bonds of the composition, the core-shell ratio were revealed. At the same time, the relati…
The surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) was studied by optical microscopy, SEM, and TEM, respectively. It is interesting to find that the surface structure of the ring-banded spherulites in polymer blends PCL/SAN (90/10) is made up of the convex bands. The landscape of th…
We present ab initio total energy calculations of the adsorption energy of one Pd monolayer on ${\mathrm{MoS}}_{2}(1000).$ We consider four different adsorption sites: the Pd atoms on top of Mo, on top of the hole site, on top of the surface S, and on the bridge position halfway between two adjacent S atoms. The large…
We have developed a new scaling property of the conductivity spectra of fluoride glasses. This property predicts the existence of a universal ionic relaxation in these glasses. The relaxation process in fluoride glasses is observed to be independent of temperature as well as the nature and concentration of the ionic c…
Semiconducting films of CdS grown by a modified close-spaced vapor transport hot-wall technique were studied by photoluminescence (PL) in the range of 10–300 K. The films were grown with an Ar pressure of 100 mTorr, the substrate temperature (Tsu) varied between 500 and 700 °C, while the source temperature (Tso) was k…
A binuclear Cu(II) complex of [(Cu(2)(HAP)(2)IPA)(OH)(H(2)O)](ClO(4))(2).H(2)O (HAP = 3-amino-1-propanol; IPA = 2-hydroxy-5-methylisophthalaldehyde) has been synthesized and characterized by X-ray crystallography, by solid state magnetic susceptibility, and in solution by (1)H NMR studies. The binuclear copper(II) com…
In this article, we report on spectroscopic studies of Pr3+:Yb3+ codoped lead fluoroindogallate glasses. By pumping with a diode laser in 0.98 μm, it was verified that the intensity of infrared luminescence at 1.3 μm of Pr3+ (1G4→3H5) is highly increased (approximately 40 times) by the presence of Yb3+. Anti-Stokes lu…
Deuterium solid-state NMR was used to study the dynamics and molecular structure of the serine (Ser) side chains in silk fibroin from Bombyx mori and from Samia cynthia ricini . Samples were selectively labeled with [3,3- 2 H 2 ]Ser, and the 2 H NMR powder spectra were analyzed by line shape simulation. Two types of m…
Spin susceptibility $\ensuremath{\chi}$ obtained by electron spin resonance in quasi-one-dimensional halogen-bridged mixed metal complexes ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Pd}}_{x}(\mathrm{cyclohexandiamine}{)}_{2}{\mathrm{Br}}_{3}$ $(0<~x<~1)$ shows a crossover from Curie-like to weakly temperature-dep…
The metastable dicarbon center $({\mathrm{C}}_{s}--{\mathrm{C}}_{i})$ in silicon has been studied by infrared absorption spectroscopy. After electron irradiation of carbon-doped silicon, new infrared absorption lines at 540.4, 543.3, 579.8, 640.6, 730.4, and $842.4 {\mathrm{cm}}^{\ensuremath{-}1}$ are observed. The li…
Infection of implanted cardiovascular biomaterials still occurs despite inherent host defense mechanisms. Using a rotating disk system, we investigated Staphylococcus epidermidis and polymorphonuclear leukocyte (PMN) adhesion to a polyetherurethane urea (PEUU-A') under shear stress (0-17.5 dynes/cm2) for time periods…
Simulation results of the thermal conductivity ℒ of the Dissipative Particle Dynamics model with Energy Conservation (DPDE) are reported. We also present an analysis of the transport equations and the transport coefficients for DPDE based on a local equilibrium approximation. This approach is valid when the particle–p…
Aliphatic polyimides containing adamantyl units (APIs) were prepared by the poly(addition/condensation) of a dianhydride bicyclo[2.2.2]octane-2,3,5,6-tetracarboxylic 2,3 : 5,6-dianhydride with a rigid diamine, 1,3-diaminoadamantane or 3,3′-diamino-1,1′-biadamantyl, and a flexible diamine, 4,4′-methylenebis(cyclohexyla…
Various physical properties of Y 2- x Bi x Ru 2 O 7 have been studied. The critical temperature T G of a spin-glass transition observed in the system decreases with x and goes to zero at x = x c in the region of the insulator-metal phase boundary. The low temperature specific heat coefficient γ increases with decreasi…