Materials Literature
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Cation-cation complexes of NpO 2 + and PuO 2 + with UO 2 2+ and Th 4+ were studied using laser-induced photoacoustic spectroscopy (LIPAS). An equilibrium constant of 2.4±0.2 M -1 was measured at an ionic strength of 6.0 M for the NpO 2 + · UO 2 2+ complex which is in good agreement with previous measurements using con…
We report a muon spin relaxation $(\ensuremath{\mu}\mathrm{SR})$ investigation of the organic spin-Peierls compound $\mathrm{MEM}(\mathrm{TCNQ}{)}_{2}$ at temperatures down to 39 mK. We have observed a slowing down of the electronic spins as the spin-Peierls gap widens at temperatures below the spin-Peierls transition…
Diamond-like carbon (DLC) coatings were deposited using a commercial direct ion beam deposition technique on thin-film Al2O3–TiC inductive write heads. The coating thicknesses used were 5, 10, and 20 nm. Accelerated wear tests were conducted with metal particle tapes in a linear tape drive. Atomic force microscopy was…
Abstract An ultrathin palladium film on a porous TiO 2 ceramic membrane was successfully synthesized by a novel photocatalytic deposition (PCD) method. The mechanism was interpreted by the photocatalytic reaction between the surface of the TiO 2 semiconductor and the Pd(II) solution. Energy dispersive (EDS) analysis a…
A bioreactor system operating in a continuous mode was designed to generate biofilms on polished and as-received surfaces of AISI 316 stainless steel coupons exposed for 36 d to a pure culture of marine Pseudomonas NCIMB 2021. Scanning electron microscopy (SEM) and atomic force microscopy were employed to determine th…
The magnetization and magnetostriction of a variety of Laves phase rods of TbxDyyHo1−x−yFe1.95 grown in the form of [112] oriented dendritic platelets were measured as a function of magnetic field H(−2200<H<2200 Oe), compressive stress (20, 30, and 40 MPa), and temperature T(−60<T<80 °C). C…
We study low-strain synthetic high pressure, high temperature diamonds by cathodoluminescence and observe novel fine structure in the free exciton and the boron-bound exciton emission. The basic spectral structure is a doublet with DeltaE approximately 11 meV common to both exciton spectra. This resolves the previousl…
Can carbon nanotubes be efficient structural reinforcements for high-strength polymer composites? Here it is shown that, during loading, individual single-walled nanotubes pull out of their bundles (see Figure), making load transfer difficult. It is thus concluded that the effectiveness of reinforcement is determined…
A micromachined thermal van der Pauw test structure is reported. Similar in principle to the conventional electrical van der Pauw Greek cross test structures, it enables the in-plane thermal sheet conductivities of thin films to be determined. The microstructure was fabricated using a commercial CMOS application-speci…
Two quaternary silver selenoarsenates Cs3AgAs4Se8 (I) and CsAgAs2Se4 (II) have been discovered by methanothermal reaction of Li3AsSe3 with AgBF4 in the presence of the respective alkali metal sources Cs2CO3 and CsCl. Orange crystals of Cs3AgAs4Se8 (I) were formed after reaction at 120 degrees C for 72 h, whereas red C…
The influence of geometric confinement on the state of order and on the glass relaxation process was investigated for a triphenylene derivative able to display a highly ordered plastic columnar phase in the bulk. The compound was incorporated into porous glasses - characterized by a narrow size distribution - with ave…
Epitaxial La0.7Ca0.3MnO3 thin films on the SrTiO3(100) surface have been irradiated with 250 MeV Ag17+ ions at different nominal fluence values in the range of 5×1010–4×1011 ions/cm2, resulting in columnar defects. At low fluences these defects cause changes in material properties that are small and scale linearly wit…
Smith-Purcell (SP) radiation produced by interaction of fast electron beams running parallel to strings of nanoparticles is investigated. Results for the radiation emission probability and electron energy loss spectra using finite and infinite strings of Al and silica spheres are presented. Both of these quantities ar…
Monolayers of 5,10,15,20-tetra-4-oxy(acetic acid)phenylporphyrin (TAPP) and its complexes formed with n -octadecylamine (ODA) in molar ratios of 1:1, 1:2, 1:3, and 1:4, n -hexadecylamine (HDA) (1:4), dimethyldihexadecylammonium bromide (DMDAB) (1:4), and tetrahexadecylammonium bromide (THDAB) (1:4) at the air−Cd 2+ so…
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Pit propagation in carbon steel exposed to a phosphate-containing electrolyte required either stagnant conditions or microbial colonization of anodic regions. A scanning vibrating electrode (SVE) was used to resolve formation and inactivation of anodic and cathodic sites on carbon steel. In sterile, continuously aerat…
The crystal structure and hydrogen positions of serandite, NaMn 2 [Si 3 O 8 (OH)]. have been refined from single-crystal X-ray and time-of-flight neutron diffraction data at ambient conditions. The proton occupies an asymmetric, double-well position between O3 and O4. confirming one of the shortest asymmetric hydrogen…
Ce substitution for the Ba site shifted the Curie point to a lower temperature than typical substitution with elements such as Zr and Sr. The substitution of Ce for the Ba sites up to 2.0 mol% exhibited a typical donor-doped behavior, the material being fine grained and of depressed dielectric constant at the Curie po…
Abstract The results of comparison of experimental 35 C1 NQR parameters for a great number of organic and organometallic compounds and estimated ones using ab initio calculations at the RHF/6-31G(d) level were systematized. The NQR frequency changes on going from one compound to another depend, in general, on the chan…
A bimetallic, fully alloyed Pd/Au colloid of 3.0 nm particle size, obtained by the co-reduction of Pd and Au salts with tetraalkylammonium triethylhydroborate, was embedded in a silica matrix employing a modified sol–gel procedure with THF as the solvent. The removal of the protecting tenside led to a mesoporous textu…