Materials Literature
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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…
The oxidation reaction of M(tpfc) [M = Mn or Cr and tpfc = tris(pentafluorophenyl)corrole] with aryl azides under photolytic or thermal conditions gives the first examples of mononuclear imido complexes of manganese(V) and chromium(V). These complexes have been characterized by NMR, mass spectrometry, UV-vis, EPR, ele…
The relaxation dynamics of water-rich glycerol-water mixtures is studied by broadband dielectric spectroscopy (BDS) at 173-323 K and differential scanning calorimetry (DSC) at 138-313 K. These data indicate the existence of the critical concentration of 40 mol % glycerol. In the studied temperature range for water-ric…
Optomechanical actuation of polymer films doped with spiropyran photochromic molecules is demonstrated by the reversible bending of the films upon laser irradiation (see Figure). The photoactuators are fully wavelength controllable and capable of operating reversibly in a few seconds. The reversible macroscopic mechan…
1. Lyotropic systems: main experimental facts and techniques 2. Basic concepts of phase transitions 3. Phase diagrams of lyotropic mixtures 4. Phase transitions between periodically organized lyotropic phases 5. The isotropic micellar and bicontinuous phases 6. The nematic and cholesteric phases 7. The lyotropic one-,…
Bimetallic Ag/Au prisms (Figure, top) and corrugated core-shell nanoparticles (Figure, bottom) are synthesized using seed-mediated growth. The sizes and shapes of these core–shell nanoparticles are tailored by varying the stoichiometric Au3+/Ag+ ratio. Decreasing Au3+/Ag+ ratio results in nanoparticles with thicker go…
Novel silica tube/polyimide (ST/PI) composite films prepared via ultrasonic dispersion and in-situ polymerization using STs (see Figure) from self-assembly and a PI precursor with N,N-dimethylacetamide as a solvent are reported. Dielectric constants significantly lower than that of the matrix are obtained. Effective m…
Single-walled carbon nanotube/ polyethyleneimine (SWNT/PEI) composite fibers are fabricated by coagulation-based spinning of SWNTs dispersed in aqueous solution by various surfactants. The spun SWNT/PEI composite fibers are either solid or hollow (see Figure), and have useful mechanical properties and over a hundred t…