Materials Literature
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We have recently proposed [D. Cangialosi et al., J. Chem. Phys. 123, 144908 (2005)] an extension of the Adam-Gibbs [J. Chem. Phys. 43, 139 (1965)] theory, combined with the concept of self-concentration, to describe the temperature dependence of the relaxation time for the component segmental dynamics in miscible poly…
Using an ab initio total energy method, we have calculated the surface energy and surface stress of Cr2AlC(0001) with the configuration of the top layer as Al[(0001)Al], Cr[(0001)Cr], and C[(0001)C] atoms, respectively. Both the surface energy and surface stress of (0001)Cr are very close to (0001)C. While those of (0…
The behavior of periodic plane arrays of split ring resonators (SRRs) and of complementary split ring resonators (CSRRs) when they are illuminated by a plane wave is analyzed. The effects of the angle of incidence and polarization are considered. A surface admittance approach is used for the analysis. Experimental res…
Abstract The present study demonstrates in situ real‐time attenuated total reflection (ATR)–FTIR spectroscopy as a powerful tool for monitoring and analyzing different polymerization and polymer modification reactions. Thus, a metallocene catalyzed copolymerization of propene and 10‐undecene‐1‐ol, a polycondensation r…
Abstract A nonspecific chitosan hydrolytic enzyme, cellulase, was immobilized onto magnetic chitosan microspheres, which was prepared in a well spherical shape by the suspension crosslinking technique. The morphology characterization of the microspheres was carried out with scanning electron microscope and the homogen…
Abstract The crystallization kinetics of pure poly(butylene terephthalate) (PBT) and toughed modification PBT/polycarbonate (PC) blends with ethylene‐butylacrylate‐glycidyl methacrylate copolymer (PTW) and ethylene‐1‐octylene copolymer (POE) were studied. For nonisothermal crystallization process studies, the Ozawa th…
The dielectric behavior and electrical conduction in Bi doped SrTiO3 annealed in both oxidizing (air and oxygen) and reducing atmospheres (nitrogen and “hydrogen+argon”) are studied in this letter. The dielectric constant and electrical conductivity are greatly enhanced in the sample annealed in a reducing atmosphere…
A simple strategy of using thin, highly (100)-oriented MgO films as template layers for CdO thin film growth by metal-organic chemical vapor deposition on amorphous glass substrates is presented. For comparison, CdO films are grown simultaneously on clean glass, on a 50nm MgO(100) template layer on glass, and on singl…
Abstract To improve the barrier properties of poly(ethylene terephthalate) (PET), PET/poly(ethylene 2,6‐naphthalate) (PEN) blends with different concentrations of PEN were prepared and were then processed into biaxially oriented PET/PEN films. The air permeability of bioriented films of pure PET, pure PEN, and PET/PEN…
Periodic zinc oxide rod arrays were fabricated on patterned templates by electrochemical deposition and were employed as field emitters. The morphology and crystal structure of the zinc oxide array were examined by scanning electron microscopy and x-ray diffraction, respectively. The dependence of the field emission c…
We have created a thermionic cathode structure that consists of a thin tungsten ribbon, carbon nanotubes (CNTs) on the ribbon surface, and a thin layer of low work function barium strontium oxide coating on the CNTs. This oxide coated CNT cathode was designed to combine the benefits from the high field enhancement fac…
Carbon nanotube (CNT) has a potential to be used as nanoscale transmission lines and as high-performance passive components in nanoelectronics. In this letter, we discuss single-walled carbon nanotubes (SWNTs) that were grown using a chemical-vapor deposition technique. Both the dc and ac two-terminal resistances were…
We report the measurements of conductivity, I-V curve, and magnetoresistance of a single Au/polyaniline microfiber with a core-shell structure, on which a pair of platinum microleads was attached by focused ion beam. The Au/polyaniline microfiber shows a much higher conductivity (∼110S∕cm at 300K) and a much weaker te…
By using the scattering matrix method, we investigate the thermal conductance in a double-stub quantum wire at low temperatures. The coupling effects between two stubs are analyzed in detail. It is found that the quantum structures exhibit oscillatory decaying thermal conductance with the width between two stubs at lo…
Using photon-in photon-out soft x-ray spectroscopy, the electronic structure of silicon nanoclusters embedded in an electrically insulating SiO2 host matrix is investigated as a function of nanocluster size. We find the nanoclusters to be of a core-shell structure with a crystalline Si core and a thin transition layer…
Molecular dynamics simulations have been used to investigate the thermodynamic melting point of the crystalline nitromethane, the melting mechanism of superheated crystalline nitromethane, and the physical properties of crystalline and glassy nitromethane. The maximum superheating and glass transition temperatures of…
Background: The transition to a hydrogen fuel economy is hindered by the lack of a practical storage method and concerns associated with its safe handling. Chemical hydrides have the potential to address these concerns. Sodium borohydride (sodium tetrahydroborate, NaBH4), is the most attractive chemical hydride for H2…
We assess the relative importance of spatial congestion and lowered temperature in the slowing dynamics of supercooled glycerol near the glass transition. We independently vary both volume V and temperature T by applying high pressure and monitor the dynamics by measuring the dielectric susceptibility. Our results dem…
A possibility to realize an isotropic left handed material up to optical frequencies is theoretically investigated. The proposed homogeneous structure consists of dielectric spheres embedded randomly in a negative permittivity host medium. While the effective permittivity of the structure is negative over a wide frequ…
Using high-resolution atomic force microscopy, we have shown extremely high stability of linear ferroelectric domains in epitaxial PbZr0.2Ti0.8O3 thin films heated up to 735°C, a significant advantage for technological applications. An elevated transition temperature ∼785°C is observed even in relatively thick (91nm)…