Materials Literature
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The effects of AlOx-cap layer on the optical and photoelectrical properties of ZnO films have been studied by cathodoluminescence (CL), photoluminescence (PL), and photoconductivity (PC). Both the PL and CL show that the cap layer improves the emission characteristics of ZnO by enhancing the band-edge emission while a…
Abstract Polymeric microspheres were prepared from a Merrifield resin via nitroxide‐mediated radical polymerization. Polystyrene, poly(acetoxystyrene), and poly[styrene‐ b ‐(methyl methacrylate‐ co ‐styrene)], poly(acetoxystyrene‐ b ‐styrene), and poly(styrene‐ co ‐2‐hydroxyethyl methacrylate) copolymers were demonstr…
Magnetization, electrical-resistance and specific-heat measurements have been performed on the ABO 3 -type half-doped Eu 0.5 Sr 0.5 MnO 3 manganite compound. These studies reveal successive sharp step-like metamagnetic transitions at low temperatures. The steps are sharp at T ⩽ 3 K but smeared above 3 K, signifying th…
We report a critical enhancement of the nonlinear optical response of dye-doped liquid crystals obtained by approaching the clearing point in the nematic phase. The enhancement of the nonlinear diffraction efficiency has been measured in the range 0.2–0.3 deg below the nematic-isotropic transition temperature. It allo…
We report on the cluster glass nature and photoinduced magnetization (PIM) of (Ni,Zn,Fe,Ti)3O4 thin films prepared using a pulsed-laser deposition (PLD) technique. The films exhibit cluster glass behaviors with a spin-freezing temperature Tf of approximately 230 K. It was found that the magnetization increases followi…
We report on the crystallization of colloidal crystals comprising of charged particles with different size ratio dispersed in thoroughly deionized water. Single components were characterized carefully and their nucleation behavior was investigated before the preparation of mixtures. Mixtures investigated at constant p…
Polypyrrole films doped with ABTS {2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonate)} show multicolor electrochromism: the anodic coloration from brown at 0.0 V to greenish blue at 0.8 V due to oxidation of ABTS to its radical; and the cathodic coloration to yellow (−1.0 V) based on the reduction of polypyrrole itself.
Nanocrystalline diamond (NCD) has attracted great attention both experimentally and theoretically in the past few years. The identification of the presence and the amount of NCD in amorphous carbon film has been a challenging issue. Although Raman spectroscopy has become a standard tool for the characterization of var…
The magnetoresistance (MR) in cold-pressed magnetite nanopowders has been studied using pulsed magnetic field up to 42 T and steady field up to 12 T. Ball milling in air produces pure and stoichiometric Fe3O4 grains of nanometric size coated by a thin layer of Fe2O3, which electrically isolates the magnetite and acts…
The crystal and magnetic structure of ${\mathrm{Ba}}_{5}{\mathrm{Co}}_{5}{\mathrm{O}}_{14}$ has been determined by means of x-ray and neutron diffraction. This oxide has trigonal symmetry (space group $P\text{\ensuremath{-}}3m1$) and lattice parameters $a=5.6453(3)\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ and $c=11.9…
A new method to prepare monolayers of ω-alk-1-ene-silane-functionalized Fe3O4 nanoparticles, covalently linked to a hydrogen-terminated silicon (111) surface by thermal hydrosilylation is reported (see Figure). The nanoparticle monolayer on silicon system was structurally and magnetically characterized, and the techni…
Micrometer-sized carbon–cobalt spheres are demonstrated to be formed by the pyrolysis at 650 °C of a dicobalthexacarbonyl-complexed poly(p-phenyleneethynylene) derivative (see Figure). The spheres are obtained in quantitative yield and are shown to be composed of cobalt, carbon, and potentially a small amount of oxyge…
We propose a dynamic structure of coupled dynamic molecular strings for supercooled small polar molecule liquids and accordingly we obtain the Hamiltonian of the rotational degrees of freedom of the system. From the Hamiltonian, the strongly correlated supercooled polar liquid state is renormalized to a normal superdi…
Jede Menge Kugeln: Nanoporöse Polyelektrolyt(PE)-Kugeln sind durch schichtweises Abscheiden der entgegengesetzt geladenen Verbindungen Polyacrylsäure und Poly(allylaminhydrochlorid) auf mesoporöse Siliciumoxidkugeln (nach jedem Schritt wird durch Erhitzen vernetzt) und anschließendes Entfernen der Siliciumoxidtemplate…
Mesoporous silicas such as SBA-15 and MCM-41 are being actively investigated for potential applications in catalysis, separations, and synthesis of nanostructured materials. A new method for functionalizing these mesoporous silicas with aromatic phenols is described. The resulting novel hybrid materials possess silyl…
We report on the observation of remarkable room-temperature ferromagnetism in epitaxial (Zn,Mn)O films grown by a pulsed-laser deposition technique using high-density targets. The optimum growth conditions were demonstrated from x-ray measurements, microstructure, Rutherford backscattering, micro-Raman, and magnetic s…
We analyze the simultaneous mechanical and chemical equilibrium at the interface between a fluid electrolyte and a solid conductor in terms of a continuum theory, with attention to surfaces of varying orientation and of arbitrary curvature. On top of the variable which is conjugate to the surface stress, the tangentia…
Polystyrene-block-poly(4-vinylpyridine) with nominally one pentadecylphenol molecule hydrogen-bonded to each pyridine group has been electrospun, leading to fibers with a hierarchical, structure-within-structure morphology (see Figure). An internal structure on the nanometer length scale exists within a structure on t…
Low-temperature hydrothermal techniques were used to synthesize single crystals of Ag(4)V(2)O(6)F(2). This previously unreported oxide fluoride phase was characterized by single-crystal X-ray diffraction and IR spectroscopy and was also evaluated as a primary lithium battery cathode. Crystal data: monoclinic, space gr…
We have investigated the influence of nickel doping in a series of n-type CoSb3 skutterudite materials partially filled with Ca. The electrical resistivity, thermopower, and thermal conductivity have been measured in the 300–800 K temperature range on CayCo1−xNixSb12 compounds prepared by a powder metallurgy route. Th…