Materials Literature
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The water sorption behavior and the activation energy were investigated for various chemical structure polyimide thin films; BPDA-PDA, BPDA-ODA, PMDA-ODA, and 6FDA-ODA. The activation energy for the water diffusion varied in the range of 5.53 to 9.27kcal/mol, and was in the increasing order: BPDA-PDA < BPDA-ODA < PMDA…
CsBr doped with Ga+ has previously proved to be an efficient X-ray storage phosphor with a figure of merit comparable to that of the commercially used BaFBr:Eu2+. By measuring the magnetic circular dichroism of the optical absorption (MCDA), the MCDA-detected electron paramagnetic resonance and the photostimulated lum…
Chelating polymer granules containing amidoxime chelating groups were synthesized by radiation-induced homopolymerization of acrylonitrile monomer. The chemical reactive intermediate polyacrylonitrile was treated with hydroxylamine solution to convert the chemical active cyano groups into the amidoxime groups. Kinetic…
Selective catalytic reduction (SCR) of NO with propene (C3H6-SCR) and propane (C3H8-SCR) over different levels of Cu(II) or Co(II) ion exchanged into ZSM-5 zeolite has been evaluated under flowing conditions with 1500 ppm of NO + 4500 ppm of C3H6 or C3H8 + 3 vol.% of oxygen in helium at a gas hourly space velocity of…
First results of an inter-laboratory comparison (27 participants in Europe, Japan and USA) of XPS data obtained with non-conducting samples are presented. Binding energies of Al 2s for alumina, N 1s and imide C 1s for Kapton and Sr 3p3/2 for a strontium titanate film on glass were obtained after static charge referenc…
(Ba, Sr)TiO 3 (BST) thin films have been grown on planar Ir/Si and Pt/Si substrates and on three-dimensional (3D) Ir electrodes by metalorganic chemical vapor deposition using two kinds of β-diketonate-based BST precursors. Film growth was studied as a function of film thickness, composition, and substrate temperature…
In this article, the characterization of the microstructure and interface of hybrid composites is discussed. Poly(p-phenylene biphenyltetracarboximide) was used as a matrix polymer and tetraethoxysilane was a precursor of silica. Polyimide/silica hybrid composites were prepared by sol–gel reaction and thermal imidizat…
Preparative methods of polymers containing a silicon-oxygen bond in the main-chain are systematically summarized with emphasis on recent developments in the synthesis of polycarbosiloxanes, poly(silyl ether)s, and poly(silyl ester)s.
We performed feasibility tests of photoelectron emission spectromicroscopy of wet samples in the water window (285–532 eV) soft x-ray spectral region. Water was successfully confined in an ultrahigh vacuum compatible compartment with x-ray transparent sides. This water cell was placed in the MEPHISTO spectromicroscope…
Rare-earth iron nitrides are emerging as an important class of magnetic materials. In certain rare-earth iron compounds, the insertion of small atoms such as nitrogen and boron has resulted in significant changes in the magnetic properties in the form of higher Curie temperatures, enhanced magnetic moments, and strong…
The photophysical properties of water soluble Zn(II) meso-tetrakis(N-methylpyridinium-4-yl)-porphyrin were studied in reverse micelles of the iso-octane–AOT–water system. Broadening of absorption and emission bands as well as shifts and increase of maxima intensities were observed with different values of W0 = [H2O]/[…
General information about microarc oxidation (MAO) process and the influence of MAO on mechanical and corrosion-mechanical properties of titanium alloys was presented. The formation conditions, compositions, and physical-chemical characteristics of anticorrosion, antiscale, wear-resistant, and antiscuff coatings were…
The analytical expression of the phase profile of the optimum diffractive beam splitter with an arbitrary power ratio between the two output beams is derived. The phase function is obtained by an analytical optimization procedure such that the diffraction efficiency of the resulting optical element is the highest for…
We used 10-MeV electrons to rapidly produce radiation damage in zirconium alloys, investigated whether electrons produced the same microstructural changes as neutrons, then performed post-irradiation corrosion tests to determine whether electron-irradiated materials displayed similar corrosion behavior to neutron-irra…
The synthesis, microstructure, and thermal behavior of a series of poly(ethylene terephthalate) (PET) copolymers containing nitroterephthalic units are described. These novel copolyesters were synthesized by transesterification followed by melt copolycondensation of dimethyl terephthalate and dimethyl nitroterephthala…
The competition between thermal decomposition (kdis) and O2 addition (kO2) of linear and branched C4 and C5 alkanoyl (R-C(•)O, R=alkyl) radicals has been studied in a photochemical reaction chamber made from stainless steel (v=12 L). RCO radicals were prepared by continuous photolysis of Br2–RC(O)H–O2–NO2–N2 mixtures…
The functionalization of poly(butylene terephthalate) (PBT) has been accomplished in a twin screw extruder by grafting maleic anhydride (MA) using a free radical polymerization technique. The resulting PBT-g-MA was successfully used as a compatibilizer for the binary blends of polyester (PBT) and polyamide (PA66). Enh…
Lanthanum phosphate (LaPO4) powders with 1, 2 and 5 mol.% Sr substitution were prepared and sintered at 1450 °C. Bulk, grain boundaries and surfaces of different origins were investigated using powder x-ray diffraction (XRD), SEM, electron probe microanalysis (EPMA), transmission electron microscopy (TEM) and XPS in o…
Thermo-decomposition of precursor complexes was utilized to synthesize scandia-stabilized zirconia (ScSZ) with the composition (Sc2O3)0.08(ZrO2)0.92. Mixtures of precursors with different contents of EDTA (ethylenediaminetetraacetic acid) were synthesized through a homogenous soft chemical process, enabling the influe…
Parvalbumins constitute a class of calcium-binding proteins characterized by the presence of several helix-loop-helix (EF-hand) motifs. In a previous study (Revett SP, King G, Shabanowitz J, Hunt DF, Hartman KL, Laue TM, Nelson DJ, 1997, Protein Sci 7:2397-2408), we presented the sequence of the major parvalbumin isof…