Materials Literature
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Europium β‐diketonates have desirable optical properties, and transparent inorganic materials that have been doped with these chelates seem to be promising for potential applications in luminescence‐display devices, integrated optical device sources, and new visible lasers. However, these chelates may be decomposed or…
Monazite (LaPO 4 ) has been proposed as an interphase to promote debonding between the reinforcement and the matrix during the fracture of oxide‐based composites. The correlation between fracture behavior and micromechanical properties in model alumina/monazite (Al 2 O 3 /LaPO 4 ) multilayer laminates has been investi…
Within the framework of the effective-field theory, the phase diagram (transition temperature Tc and critical transverse field Ωc) of a ferroelectric bilayer system is studied on the basis of the spin-1/2 transverse Ising model consisting of two different ferroelectric slabs with the same thickness L. The dependences…
There has been a substantial growth in the application of mass spectrometry (MS) methods for the analysis of inorganic materials, due to the inherent sensitivity of mass spectrometry ionization to the specific composition and structure of the analyzed materials. To date, few mass spectrometry studies have focused on m…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBoratastilbene: Synthesis, Structural Characterization, and PhotophysicsBun Yeoul Lee, Shujun Wang, Markus Putzer, Glenn P. Bartholomew, Xianhui Bu, and Guillermo C. BazanView Author Information Department of Chemistry, University of California Santa Barbara, Californi…
Extracellular matrix (ECM) polymers secreted by the diatoms Achnanthes longipes Ag. and Cymbella cistula (Ehr.) Kirchn. completely encase the cell and are responsible for adhesion and other interactions with the external environment. To preserve details of the highly hydrophilic ECM in the native state and to preserve…
A computerized pattern recognition system based on the analysis of phase resolved partial discharge (PRPD) measurements, and utilizing genetic algorithms, is presented. The recognition system was trained to distinguish between basic types of defects appearing in gas-insulated system (GIS), such as voids in spacers, mo…
Abstract The dehydroxylation of Ca-, K-, Mg- and Na-saturated Wyoming montmorillonite has been studied by thermogravimetry (TG), infrared (IR) spectroscopy and X-ray diffraction (XRD). Samples saturated with either Ca 2+ or Mg 2+ show a predominantly diffusion-controlled reaction step, whereas Wyoming montmorillonite…
A new series of porphyrins has been synthesised, incorporating four identical chiral binaphthyl derivatives in the meso-positions. Owing to a hindered rotation around the bond between the naphthyl and the porphyrin, four atropisomers are generated, which were fully separated by preparative TLC and thoroughly character…
In order to investigate nonlinear optical properties, in particular second harmonic generation (SHG) of organometallic complexes, numerous dipolar monocationic sesquifulvalene complexes of the general form [Mc–Z–C7H6]+ have been synthesised (Mc = metallocenyl), wherein the metallocenyl moiety Mc acts as an electron do…
Two liquid crystalline vanadyl complexes have been studied by frequency domain dielectric spectroscopy over the range 10 mHz to 13 MHz. The materials exhibit two or three columnar phases denoted Colro, Colrd, and Colhd that were identified by X-ray diffraction. In the higher temperature Colrd phase, a relaxation proce…
A new facile and rapid polycondensation reaction of 4,4′-(hexafluoroisopropylidene)-N,N′-bis(phthaloyl-L-leucine) diacid chloride (1) with several aromatic diamines, including benzidine (2a), 4,4′-diaminodiphenyl methane (2b), 1,5-diaminoanthraquinone (2c), 4,4′-sulfonyldianiline (2d), 3,3′-diaminobenzophenone (2e), P…
Iron(II) complexes exhibiting thermal spin crossover may be converted from the 1 A 1 low-spin (LS) state to the 5 T 2 high-spin (HS) state by irradiation with green light (light-induced excited spin-state trapping, LIESST). The lifetime of the metastable LIESST state may be sufficiently long for X-ray diffraction stud…
Steady-state and time-resolved fluorescence data are used to examine the photophysical characteristics of a series of phenylacetylene dendrimers. Correlated excimer formation is observed in some solvents which is found to depend strongly upon initial excited-state placement within the dendrimer framework. The results…
A new preparation method for highly dispersed iron in mesoporous MCM-41 materials has been developed, employing a methanolic solution of iron(III) nitrate. In situ EXAFS and NO adsorption followed by IR spectroscopy suggest that the resulting iron is present mainly in the form of isolated cations bound to the internal…
Elastic and inelastic neutron-scattering experiments have been performed in a ${\mathrm{La}}_{0.94}{\mathrm{Sr}}_{0.06}{\mathrm{MnO}}_{3}$ untwinned crystal, which exhibits an antiferromagnetic canted magnetic structure with ferromagnetic layers. The elastic small q scattering exhibits a modulation with an anisotropic…
3D inorganic monoliths with sponge-like texture have been produced using polymer–gel templates. Colloidal suspensions of magnetite or titanium dioxide nanoparticles were diffused into swellable gels (see Figure) composed of acrylic acid–based copolymers, and possessing 3D channels. Hybrid composites were produced that…
Seven absorption group-bands (1D2, 1G4, 3F2, 3F3, 3H4, 3H5, 3F4) of Tm3+ in YVO4 single crystals have been observed in the orientation absorption spectra recorded in the spectral range from 200 to 4000 nm at 300K. The integrated absorption cross section for each group-band was accurately evaluated. On the assumption t…
Zinc oxide thin films have been grown on silicon (100) and sapphire (0001) substrates by pulsed laser deposition. The thin films deposited at different processing parameters were evaluated by x-ray diffraction, Raman spectroscopy, and atomic force microscopy (AFM). The influences of substrate temperature and laser flu…
Barium cerate crystals of 1.5 mm diameter could be grown from melt solutions containing barium chloride, barium oxide (from thermolysis of barium carbonate), and cerium(IV) oxide. The maximum size of the crystals is limited by the low solubility of cerium(IV) oxide in the barium chloride melt (ca. 0.1 Mol%). The flux…