Materials Literature
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We have studied the properties of aqueous suspensions of ZnO powders with different purities. Our results suggest that powder purity determines the amount of dispersant necessary to form a stable aqueous suspension as well as the maximum adsorption capacity of the dispersant: the higher the positive surface charge of…
Major ampullate (dragline) silk is attracting significant attention as a potentially useful engineering fiber. This interest is motivated by reports that the silk exhibits high mean strength, stiffness and toughness as measured in tensile tests. However, the typical testing conditions (constant strain rate; experiment…
Au/SiO2 nanocomposites were prepared by rf-sputtering of gold on amorphous silica substrates. Deposition experiments were carried out in Ar plasmas at temperatures as low as 60 °C. Particular attention was devoted to the combined influence of the applied rf power and total pressure on the chemico-physical properties o…
Abstract Cs 2 H 12 MgO 14 S 2 , monoclinic, P 12 1 / a 1 (No. 14), a = 9.338(2) Å, b = 12.849(4) Å, c = 6.361(2) Å, β = 107.07(2)°, V = 729.6 Å 3 , Z = 2, R gt (F) = 0.017, wR ref (F 2 ) = 0.041, T = 293 K. Cs 2 H 12 MnO 14 S 2 , monoclinic, P 12 1 / a 1 (No. 14), a = 9.418(3) Å, b = 12.963(2) Å, c = 6.386(3) Å, β = 1…
Abstract Poly(ethyl glyoxylate) (PEtG), a new polyacetal, was synthesized via anionic polymerization in CH 2 Cl 2 . End-capping was achieved using phenyl isocyanate. Average molecular weights in the range of 9000 - 216 000 were obtained. 1 H and 13 C NMR characterization highlight the non-stereoregularity of PEtG. The…
See article by Schenke-Layland et al. (pages 497–509) in this issue. Valve replacement is the most common surgical procedure in patients with advanced valvular heart disease [1]. Extensive experience has been gained with mechanical and decellularized biological valve prostheses since their clinical implementation in 1…
Non-destructive/noncontact stress sensors based on magnetoelastic principles have numerous applications for monitoring cable stress. However, their widespread use is hampered by problems related to temperature compensation and to scaling of calibration data to large cables, which is the domain of greatest interest. In…
A complex of 1,1-cyclobutanedicarboxylic acid with terbium was obtained as a pentahydrate. The salt crystallizes in the monoclinic system, space group P21/n with a = 15.885(3), b = 8.489(2), c = 19.189(4) Å, β = 106.02(3)° and Z = 4. The structure was solved by direct methods and refined to R = 0.0537. The complex for…
Nanocrystalline samples of the manganites La 0.9 Ag 0.1 MnO 3 , La 0.7 Ag 0.3 MnO 3 , and La 0.7 Sr 0.3 MnO 3 were synthesized through pyrolysis and isothermally annealed. The atomic, subatomic, and magnetic structures of these manganites were studied using magnetic, x-ray, and neutron diffraction measurements. Increa…
Each ommatidium of the Drosophila eye is constructed by precisely 19 specified precursor cells, generated in part during a second mitotic wave of cell divisions that overlaps early stages of ommatidial cell specification. Homozygotes for the pineapple eye mutation lack sufficient precursor cells due to apoptosis durin…
A theory is presented for the forward growth of ferroelectric domains taking place during polarization reversal. A faster forward motion in comparison with a sidewise motion is explained in terms of forces arising from the depolarization field of the growing domain. Dynamic equations for the time dependence of the dom…
Lanthanum cobaltite (LaCoO3) nanosystems were synthesised by an innovative combined use of the chemical vapor deposition (CVD) and sol-gel (SG) routes. In particular, a lanthanum oxyfluoride based layer was deposited by CVD on CoOx(OH)y SG substrates (xerogel). The subsequent thermal treatment in air, between 400 and…
The goal of this work is to make a contribution to the understanding of the microscopic mechanisms of H-induced intergranular damage. We develop an embedded-atom method interatomic potential for H in the Al–Mg system with the main aim of reproducing the current understanding of H trapping to vacancies. This model is u…
We have refined the crystal structure of winstanleyite from the type locality, the Grand Central mine, Tombstone, Arizona, in space group I21/a¯3 to a final R index of 2.03%. Unit-cell parameters of the crystal examined are: a 10.965(1) Å, V 1318.3(2) Å3, Z = 8. The structure previously reported for the synthetic anal…
The present paper describes the erosion of 60 μ m thick diamond coatings on tungsten, 600 μ m thick free standing diamond brazed to tungsten carbide and two grades of cemented tungsten carbide and stainless steel type 316. The erosion rate of the diamond samples was between 12 and 30 times lower than that of tungsten…
Submicrometer α‐alumina powder was successfully synthesized from seeded aluminum hydroxide peptized with tetraethylammonium hydroxide (TENOH) and hydrothermally treated at 200°C, using α‐alumina particles as seeds. The powders were characterized by XRD, SEM, DTA‐TG, and BET analyses. Results showed that seeding could…
Domain switching behaviors of sol-gel derived lead zirconate titinate (PZT) films have been characterized for ferroelectric memory applications by measuring P - E hysteresis curves as a function of frequency, temperature and electrode size. The coercive field ( E c ) of PZT films strongly depended on the measuring fre…
Abstract Papers published during 2001 - 2002 on the synthesis and preparation of polymers and polymer-based devices and their applications are reviewed. Polymers for drug and gene delivery, gene therapy, controlled drug release, conjugation with peptides, proteins, and nucleotides, tissue engineering, bone repair and…
The Rayleigh-scattered light intensities of silica glasses containing chlorine with concentrations from 0 to 1.8 mol% were measured. The scattered intensity was found to change linearly to the fictive temperature but was independent of chlorine concentration within experimental error. The result indicates that chlorin…
Abstract Ternary composites based on glass fiber reinforced polyethersulfone (gPES) modified by a liquid crystalline copolyester (R5) were obtained by injection molding at different nozzle temperatures and at LCP contents up to 20%. The blends showed two pure amorphous phases. The ability of R5 to improve processing w…