Materials Literature
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The electronic properties of bulk fcc americium and the (111) surface have been investigated with the full-potential linearized augmented plane wave (FP-LAPW) method as implemented in the WIEN2K suite of programs. The study is carried out for the anti-ferromagnetic ground state of Am at different levels of theory: (1)…
Chirality from blood: Serum albumins form strong complexes with CuII–phthalocyanines, leading to protein conjugates. These hybrid catalysts promote enantioselective Diels–Alder reactions, such as that of azachalcones 1 with cyclopentadiene (2) to give products 3 with 85–98 % ee.
We investigated methanol adsorption and dissociation on bridge-bonded oxygen vacancies of the TiO2(110)-(1x1) surface using in situ scanning tunneling microscopy. We provide the first direct evidence that methanol dissociates on oxygen vacancies via O-H bond scission rather than C-O scission. For CH3OH coverages lower…
In an attempt to develop lithium borohydrides as reversible hydrogen storage materials with high hydrogen storage capacities, the feasibility of reducing the dehydrogenation temperature of the lithium borohydride and moderating rehydrogenation conditions was explored. The lithium borohydride was modified by ball milli…
The crystallization kinetics and resulting morphology of polyethylene (PE) in the presence of single wall carbon nanotubes (SWNT) are investigated in isotropic and aligned composites. A hot coagulation method was developed to incorporate SWNT loadings as high as 30 wt % with uniform distribution. Thermal analysis inte…
Interaction of silver surface with atomic oxygen has been studied at low oxygen pressures (10 15 – 10 17 atoms.cm −2 s −1 ) and in a wide temperature range from 373 to 673 K. The only product of surface oxidation observed at these conditions was silver (I) oxide Ag 2 O. Parabolic rate law was normally observed under s…
Hydrocarbon polymers that are exposed to atomic oxygen in low Earth orbit are slowly oxidized which results in recession of their surface. Atomic oxygen protective coatings have been developed which are both durable to atomic oxygen and effective in protecting underlying polymers. However, scratches, pin window defect…
To ensure the safe and reliable operation of a gas-insulated substation (GIS), it is crucial to quickly identify partial discharge (PD) sources to prevent the occurrance of breakdowns. A method based on wavelet packet transform techniques is developed to meet this requirement. The proposed method extracts is able to e…
This article describes two mathematical formalisms for the determination of the second and fourth order parameters of molecular films using optical spectroscopy. Method A uses polarized total internal reflection fluorescence (TIRF) to calculate the second and fourth order parameters, {P2(cos theta)} and {P4(cos theta)…
Weit verzweigt: Durch Pd-katalysierte iterative Triarylierungen von Vinylboronat werden konjugierte Dendrimere mit Triarylethen-Ästen (siehe Bild) auf flexible und konvergente Art erhalten. Diese hochverzweigten Dendrimere sind in gängigen organischen Lösungsmitteln gut löslich und zeigen hohe Fluoreszenzquantenausbeu…
Oxygen permeation through a mixed conducting membrane is essentially controlled by both the bulk diffusion and the surface reactions on the both sides of the membrane; therefore, it is important to know the proportion of surface reactions in the overall oxygen permeation to improve the oxygen permeability of membranes…
Unter Kontrolle: Die Sekundärstruktur-abhängige Selbstorganisation von β-Peptiden in Lösung beweist, dass natürliche Biopolymere in ihrem Konformationsverhalten nicht einzigartig sind. Stereochemisch kontrollierte Sekundärstruktureinheiten von β-Peptidsträngen und -helices bilden Sandwich-Anordnungen aus plissierten S…
Langzeitgedächtnisstütze: Ein helicales Poly(phenylacetylen) mit positiv geladenen Seitengruppen diente in saurer wässriger Lösung als Templat für supramolekulare Helices aus achiralen Porphyrinen mit entgegengesetzter Ladung. Die supramolekularen Porphyrinaggregate behalten ihre Chiralität bei, selbst wenn das helica…
We report a novel synthetic way to deposit a thin nanoporous silica layer on a variety of solids surfaces from flat substrates to micrometer size powders and, as to the materials, from oxides and hydroxides to organic polymers.
We have measured the heat capacity of zinc oxide for several single crystals with different isotopic compositions in the $5--350\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ temperature range. We have performed first-principles calculations in order to analyze the dependence of the heat capacity on the isotope mass of the ox…
Abstract The reaction of Ln(NO 3 ) 3 ·aq with K 3 [Fe(CN) 6 ] or K 3 [Co(CN) 6 ] and 2,2′:6′,2″‐terpyridine in water/methanol solution led to three one‐dimensional complexes: trans ‐[Ln(H 2 O) 4 (terpy)(μ‐CN) 2 M(CN) 4 ] n (Ln = La 3+ or Sm 3+ ; M = Fe 3+ or Co 3+ ). The structures of [SmFe] n ( 1 ), [SmCo] n ( 2 ) an…
A de novo, genetically engineered 687 residue polypeptide expressed in E. coli has been found to form highly rectilinear, beta-sheet containing fibrillar structures. Tapping-mode atomic force microscopy, deep-UV Raman spectroscopy, and transmission electron microscopy definitively established the tendency of the fibri…
Abstract In this work, the characteristics of polypyrrole (PPy) films electrodeposited onto an electrochemically roughened gold substrate with bimetallic silver and gold nanoparticles were first investigated. First, a silver substrate was roughened by a triangular‐wave oxidation–reduction cycle (ORC) in an aqueous sol…
In the spreading of a water droplet on an aligned silicon nanorod array surface, a precursor rim was detected moving ahead of the contact line. In this process, nanorods were bundled by the capillary force to form clusters, and a watermark developed on the surface after water evaporated. The size of the watermark, R(p…
Two soluble heavy-metal phthalocyanine derivatives, namely, tetra-alpha-(2-ethylbutoxy) chloroindium phthalocyanine (alpha-InPcCl) and tetra-beta-(2-ethylbutoxy) chloroindium phthalocyanine (beta-InPcCl), were synthesized. Their optical-limiting properties in THF solution were investigated with a 532 nm nanosecond las…