Materials Literature
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We explore the electromagnetic characterization of a planar artificial magnetic metamaterial. Because the composite structure is two- rather than three-dimensional, it does not form a medium with assignable bulk properties, such as the electric permittivity and magnetic permeability. However, we find that it is possib…
It is shown that in systems with electronic half-closed-shell configurations of degenerate orbitals, e(2) and t(3) (which have totally symmetric charge distribution), ground state distortions from high-symmetry geometries may occur due to a strong pseudo Jahn-Teller effect (PJTE) in the excited states, resulting also…
Monodisperse Co, Fe, and FeCo nanoparticles are prepared via thermal decomposition of metal carbonyls in the presence of aluminium alkyls, yielding air-stable magnetic metal nanoparticles after surface passivation. The particles are characterized by electron microscopy (SEM, TEM, ESI), electron spectroscopy (MIES, UPS…
Uniform ellipsoidal ZnO particles have been synthesized in an aqueous solution in the presence of triethonalamine (TEA) mediated by sonication at the temperature below 80 degrees C. Scanning electron microscopy observations reveal that the ellipsoidal particles are highly uniform with a hexagonal cross-section. The mo…
This paper reports a novel two-step one-pot all-electrochemical method for the preparation of interpenetrating conducting-polymer (polyaniline, PANI) semiconducting oxide (V 2 O 5 ) nanocomposites. In the method, a spongy interconnected PANI network is first deposited on a titanium metal substrate. The electrodeposite…
The liquid-phase oxidation of benzene to phenol in an aqueous acetic acid solvent over a V-substituted heteropolyacid catalyst was attempted using zinc powder as the reducing reagent and gaseous oxygen as the oxidant. Phenol, an oxygenation product, was selectively obtained. Zinc powder, together with the use of gaseo…
Quinacridones are industrially important hydrogen-bonded pigments. The color in the solid state is vivid red, while it is pale yellow in solution, indicating evidently the involvement of intermolecular interactions in the solid state. The electronic structure has therefore been investigated with special attention to t…
The interactions of Al, O, and ${\mathrm{O}}_{2}$ with different $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\phantom{\rule{0.3em}{0ex}}(0001)$ surfaces have been studied using ab initio density functional theory methods. All three surface terminations obtainable by cleaving the bulk stru…
The fabrication of meso/macroporous monoliths by partial fusion of mesoporous silica spheres with the use of the pulsed current processing (PCP) method was demonstrated. Mesoporous silica spheres have been prepared by evaporation-driven surfactant templating in microdroplets. The PCP method can simultaneously subject…
Epitaxial La(3/4)Ca(1/4)MnO3/MgO(100) (LCMO) thin film shows an unusual rhombohedral (R-3c) structure with a new perovskite superstructure at room temperature due to the CE-type ordering of La and Ca with modulation vector q=1/4[011]. A-site ordered film was found to be electronically homogeneous down to the 1 nm scal…
Going straight: A luminescent composite of poly(p-phenylenevinylene) (PPV) and amylose was synthesized by direct polymerization of the precursor monomer in aqueous media in the presence of amylose. The PPV–amylose composite consists of a rigid-rod PPV segment threaded into a flexible amylose tube and self-assembles in…
As superparamagnetic nanoparticles capture new applications and markets, the flexibility and modifications of these nanoparticles are increasingly important aspects. Therefore a series of magnetic polystyrene particles encapsulating magnetite nanoparticles (10–12 nm) in a hydrophobic poly(styrene-co-acrylic acid) shel…
Ring cycle: Iron and manganese corroles are among the most efficient decomposition catalysts of peroxynitrite reported to date. The catalytic rate of the iron complex is higher than that of analogous porphyrins, and the manganese complex operates through the catalytic disproportionation cycle shown in the picture.
Adsorption studies of a genetically engineered gold-binding peptide, GBP1, were carried out using a quartz-crystal microbalance (QCM) to quantify its molecular affinity to noble metals. The peptide showed higher adsorption onto and lower desorption from a gold surface compared to a platinum substrate. The material spe…
To illustrate the shape memory properties of shape memory polyurethane (SMPU) fiber and the difference of thermal/mechanical properties between SMPU fiber and other various man-made fibers, series of shape memory polyurethane having various hard segment content were synthesized with the pre-polymerization method and s…
Transport calculations using the Boltzmann equation within energy-dependent relaxation time approximations were performed for $\mathrm{PbTe}$ and ${\mathrm{AgPb}}_{m}{\mathrm{SbTe}}_{2+m}$ (LAST-m) systems. We have used both the nonparabolic Kane model for the energy dispersion and the energy dispersion given by ab in…
Spin Hall effect in a nonlocal spin-injection device is theoretically studied. Using a nonlocal spin-injection technique, a pure spin current is created in a nonmagnetic metal (N). The spin current flowing in N is deflected by spin-orbit scattering to induce the Hall current in the transverse direction and accumulate…
Magneto-optical Kerr effect hysteresis loops at various wavelengths in the visible/near-infrared range have been used to characterize the magnetic properties of alloys obtained by implanting Mn ions at fixed energy in a Ge matrix. The details of the hysteresis loops reveal the presence of multiple magnetic contributio…
Advancements in biomedical imaging require the development of optical contrast agents at an emission region of low biological tissue absorbance, fluorescence, and scattering. This region occurs in the red to near-IR (>600 nm) wavelength window. Quantum dots (Qdots) are excellent candidates for such applications. Howev…
In insulators, the method of Marzari and Vanderbilt [Phys. Rev. B 56, 12 847 (1997)] can be used to generate maximally localized Wannier functions whose centers are related to the electronic polarization. In the case of layered insulators, this approach can be adapted to provide a natural definition of the local polar…