Materials Literature
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Cells of Cytophaga johnsonae (now Flavobacterium johnsoniae) are able to translocate on solid surfaces but are unable to swim in liquid media. Organelles that may be involved in this gliding motility have not been detected, and the mechanism(s) responsible remains unknown. The movement of latex beads attached to the c…
Abstract A range of allophane samples (atomic AI/Si bulk ratios 1.1-1.9) from Silica Springs, New Zealand, has been characterized by X-ray photoelectron spectroscopy (XPS). Binding energies of Si 2 s , Si 2 p , Al 2 p , O 1 s , C 1 s , and N 1 s electrons, together with the kinetic energies of Al KL 23 L 23 Auger elec…
The kinetics of the primary phase formation in a glass ceramic base glass near the cordierite composition in the MgO–Al2O3–SiO2 system, with additions of ZrO2 and TiO2 as nucleating agents, have been investigated by combining different small-angle scattering techniques. Phase formation in the base glass heated isother…
The photophysical and photochemical properties of two anthryl-labeled polyimides have been studied by absorption and fluorescence spectroscopy, single-photon counting, and picosecond transient absorption measurements. The observed emission decay is triexponential, with a very short-lived component of ∼50 ps being attr…
The glass transition of poly(phenylene sulfide) (PPS) has been examined by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive X-ray diffraction (EDXD) techniques. All of them evidenced the α transition of the polymer, and the results obtained with the differ…
Copper β-substituted 5,10,15,20-tetraphenylporphyrins (CuTPP-β) and their cation radicals with varied electron-withdrawing/donating substituents were studied by resonance Raman spectroscopy. A1g, Eu and substituent modes were observed with Soret excitation. Q-band spectra and CuTPP-d7-CHO shifts aided mode assignments…
Three unsubstituted cyclic ketene acetals (CKAs), 2-methylene-1,3-dioxolane, 1a, 2-methylene-1,3-dioxane, 2a, and 2-methylene-1,3-dioxepane, 3a, undergo exclusive 1,2-addition polymerization at low temperatures, and only poly(CKAs) are obtained. At higher temperatures, ring-opening polymerization (ROP) can be dominant…
Low-voltage scanning electron microscopy (LV-SEM) was used to monitor contamination by carbonaceous compounds on the surface of two different commercially available titanium dental implants. Because of its higher surface sensitivity, the LV mode allows us to image contaminating materials on surfaces that are undetecte…
A series of neutral and cationic Ni(II) and Pd(II) complexes with the open tetraaza ligand bisoxazoline bisamine N 4, were prepared and characterized. Neutral complexes presented dimeric structures of stoichiometry [M 2 (μ-N 4 )X 4 ] (M = Ni ( 1 ), Pd ( 2 )) and underwent slow decomplexation in coordinating solvents.…
During 3 years that have passed since MEIPIC-2 conference investigations have been conducted in the field of expanding and ascertaing data obtained in physics and technique of magnetoelectric phenomena. Below is a brief review of papers presented to MEIPIC-3 conference.
The infrared and Raman spectra of tetracalcium phosphate (Ca4P2O9) were measured and interpreted on the basis of factor group analysis. Factor group splitting can be noted for the various internal vibrational modes of the PO4 3- ion. However, a fewer number of factor group-split bands can be seen than predicted becaus…
Isostructural HfGeO 4 and ZrGeO 4, activated with Ti 4+, yield blue luminescence when irradiated with X-rays. An adequate understanding of the observed blue luminescence requires the determination of the site occupancy and the local Ti 4+ environment; i.e., the site symmetry. Raman spectroscopy has been used to probe…
The toolbox for spin coupling is now well equipped, since nearly all possible topologies of organic tri- and tetraradicals are known, which can be applied as building blocks for the synthesis of practically useful polyradical materials. High-spin polyradicals could be useful as organic ferromagnets, whereas several lo…
A series of single crystals of quasi-one-dimensional halogen-bridged Ni-Pd mixed-metal compounds, Ni<SUB>1-x</SUB>Pd<SUB>x</SUB>(chxn)<SUB>2</SUB>B<SUB>r3</SUB> (chxn equals 1R, 2R- cyclohexanediamine) have been obtained by electrochemical oxidation methods. In order to investigate the competition between the electron…
Using the previously reported vibrational results (infrared, Raman and resonance Raman spectra) for the Ce2O2S and Ce2.0O2.5S solid compounds (see Part I), comparative lattice dynamics calculations were performed. These calculations allow one to reproduce satisfactorily the experimental wavenumbers and to propose more…
Abstract Vinylformamide (VFA) is cationically polymerized in various solvents at 273 K and reaction temperature by the following initiators: iodine, bis(4‐methoxyphenyl)‐methyl chloride/silica, triphenylmethyl chloride/silica, and trimethylsilyl triflate. In every case defined oligomers with narrow molecular weight di…
We present an x-ray diffuse scattering study of the anion ordering (AO) transition in the ${(\mathrm{TMTSF})}_{2}{(\mathrm{R}\mathrm{e}\mathrm{O}}_{4}{)}_{1\ensuremath{-}x}({\mathrm{ClO}}_{4}{)}_{x}$ solid solution of quasi-one-dimensional organic conductors and superconductors. As ${(\mathrm{TMTSF})}_{2}{\mathrm{ReO}…
A detailed study of the magnetic behavior of the molecule-based magnet, [MnOEP][HCBD], (OEP=meso-octaethylporphyrinato, HCBD=hexacyanobutadiene) from 1.7 to 20 K was performed. The earlier reported magnetic transition at 19.6 K, ascribed to a crossover from a one-dimensional Heisenberg-like ferrimagnet to a two-dimens…
Abstract The interaction between the oppositely charged polymers poly(diallyldimethylammonium chloride) (PDADMAC) and poly(maleic acid‐co‐α‐methylstyrene) (P(MAMS)) in the presence of cellulose can be used for strong surface modification. The dependence of the modification effect on the concentration of polymers and o…
Oxygen tracer diffusion in polycrystalline (La,Ca)CrO 3−delta was studied by the gas‐solid isotope exchange reaction in combination with a depth‐profiling technique using secondary‐ion mass spectroscopy, which allowed determination of coefficients of lattice and grain‐boundary diffusion separately. A significant contr…