Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Sulerythrin is the first rubrerythrin-like protein to be isolated from an aerobic organism, Sulfolobus tokodaii strain 7, and it lacks a C-terminal rubredoxin-like FeS(4) domain. The protein purified from Sulfolobus cells was crystallized, and the crystal structure was determined at 1.7 A resolution. The dimer of sule…
Das amphiphile Monodendron (3,4,5)2G2-CO2Me ändert seine konische all-trans-Form zu einer kronenartigen all-gauche- oder einer spitz zulaufenden all-trans-Konformation, wenn die n-Dodecan-1-yloxy-Gruppen durch teilfluorierte Seitenketten ersetzt werden. Auch die Selbstorganisationseigenschaften der Monodendrone unters…
The tendency for silver-rich compounds to form higher agglomerates of silver atoms or ions is well known. The synthesis of Ag13OsO6 represents the first compound in the Ag/Os/O system. Besides [OsO6]4− octahedra, the compound contains icosahedrally shaped Ag134+ clusters (see picture), which are observed for the first…
Adsorption of 2-mercaptopyrimidine (2-MP), a prototype of biologically important N-heterocyclic aromatic thiols, has been examined on 100−120 nm silver particles in aqueous solution. Density functional calculations (UBPW91/6-31+G**) on various thione and thiol tautomers of the molecule have been performed to augment e…
We present the synthesis, characterization by DT-TGA and IR, single crystal X-ray nuclear structure at 300 K, nuclear and magnetic structure from neutron powder diffraction on a deuterated sample at 1.4 K, and magnetic properties as a function of temperature and magnetic field of Ni(3)(OH)(2)(SO(4))(2)(H(2)O)(2). The…
Abstract Polypropylene/ethylene vinyl acetate (PP/EVA) blends were prepared in a plastic extruder with a static mixer. The thermodynamic compatibility, morphology, crystal form, and rheological behavior of PP/EVA blends were investigated by SEM, DSC, and rheology instruments. The results showed that PP and EVA were th…
Abstract Alternating poly(ester amide)s 6a – e from succinic anhydride and α,ω‐amino alcohols H 2 N—(CH 2 ) x —OH ( x = 2–6) 2a–e were obtained in two steps: α‐carboxyl‐ω‐hydroxy amides 3a–e were prepared from the starting materials in a highly selective reaction, followed by a polycondensation reaction. 1 H and 13 C…
Abstract The combination of a hydroxyl‐functional organophosphorus flame‐retarding agent (FR) and dimethyloldihydroxyethyleneurea (DMDHEU) was used as a durable flame‐retardant finish system for cotton fabrics. DMDHEU functions as a binder between FR and cotton cellulose, thus making this flame‐retarding system durabl…
Abstract The synthesis of block and graft copolymers containing insulating and conducting polypyrrole or polythiophene segments via a two‐step procedure is described. Synthetic pathways to prepare pyrrole and thiophene functional macromonomers involving conventional and controlled/living polymerizations such as anioni…
Toward the development of new strategies for the synthesis of multiporphyrin arrays, we have prepared and characterized (electrochemistry and static/time-resolved optical spectroscopy) a series of dyads composed of a zinc porphyrin and a free base porphyrin joined via imine-based linkers. One dyad contains two zinc po…
Results are reported for ellipsometric measurements of hydrophobized monodisperse silica particles, with a diameter of about 25 nm, spread at the toluene-water interface. Theoretical values for the ellipsometric parameters are derived by treating the particles as a core-shell model and performing integrations of the r…
Predictable with the color rules? The NIR dye 1 has a novel, mesoionic structure that exhibits a “super acceptor” function and an absorption far in the near infrared within a remarkably small chromophore.
To investigate new architectures for the self-assembly of multiporphyrin arrays, a one-flask synthesis of a shape-persistent cyclic hexameric array of porphyrins was exploited to prepare six derivatives bearing diverse pendant groups. The new arrays contain 6-12 carboxylic acid groups, 12 amidino groups, 6 thiol group…
A series of Ru(bpy)(2)-dioxolene complexes 1-4 (bpy = 2,2'- bipyridine) and corresponding Ru(dcb)(2)-dioxolene complexes 5-8 (dcbH(2) = 2,2'-bipyridine-4,4'-dicarboxylic acid) have been prepared, and their spectroelectrochemical behavior in solution has been investigated. The complexes show reversible electrochemical…
Abstract Wood flour (WF)–polycaprolactone (PCL) and polybutylenesuccinate–butylenecarbonate (PBSC) composites were prepared by knead processing. The effects of a compatibilizer on the tensile and thermal flow properties of the composites were investigated. PCL‐ graft ‐maleic anhydride (PCL‐ g ‐MA) was used as a compat…
The band structure of large-sized (20–35 nm) nanocrystallites (NCs) of Si 2− x C x (1.04 < x < 1.10) has been investigated using different band energy approaches and a modified Car–Parinello molecular dynamics structure optimization of the NC interfaces. The excess of carbon favours the appearance of a thin prevailing…
The transition between a ferromagnetic metal and an insulator with short-range charge/orbital correlation has been investigated for the manganites ${R}_{0.55}{\mathrm{Sr}}_{0.45}{\mathrm{MnO}}_{3}$ $[R=\mathrm{Sm},$ Eu, Gd, and ${\mathrm{Sm}}_{1\ensuremath{-}y}{\mathrm{Gd}}_{y}$ $(0<~y<~1)]$. The phase diagram a…
Free-standing films of multiwalled carbon nanotubes (see scanning electron micrograph) encapsulating crystalline metal particles are obtained by the solid-state thermolytic conversion of commercial homogeneous organometallic systems with a defined metal-to-carbon ratio.
${\mathrm{LaNi}}_{0.5}{\mathrm{Co}}_{0.5}{\mathrm{O}}_{3}$ was measured in terms of x-ray-absorption near-edge structure (XANES), powder x-ray diffraction, magnetic susceptibility, resistivity, and heat capacity. A small but clear heat capacity anomaly and an ac susceptibility peak were observed at 53 K. The peak temp…
Cross-linked hydroxypropylmethylcellulose (HPMC) cast films with citric acid as polycarboxylic cross-linker were elaborated to study the effect of cross-linking level on various properties. Increased amounts of cross-linking agent were not connected to statistically different tensile strength and Young's modulus. What…