Materials Literature
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We study growth limited by packing for irregular objects in two dimensions. We generate packings by seeding objects randomly in time and space and allowing each object to grow until it collides with another object. The objects we consider allow us to investigate the separate effects of anisotropy and nonunit aspect ra…
We present the results of extensive three-dimensional off-lattice Monte Carlo simulations of two interacting spherical brushes. We have measured the interacting force in systems where curvature effects are important. Our results support a description of the force profile divided into two regimes. At short separating d…
Abstract Mit Hilfe von Einkristall‐ und Pulverdaten wurden die Kristallstrukturen der Monohydrate von Lithiumchlorid und Lithiumbromid aufgeklärt. Die Verbindungen kristallisieren isotyp in der Raumgruppe Cmcm (LiCl·H 2 O: Einkristallstrukturanalyse; T = 100 K; a = 758, 35(2); b = 768, 07(2); c = 762, 35(2) pm; Z = 8;…
1-aminocyclopropane-1-carboxylate (ACC) deaminase is a pyridoxal 5'-phosphate (PLP) dependent enzyme which catalyzes the opening of the cyclopropane ring of ACC to give alpha-ketobutyric acid and ammonia. In an early study of this unusual C(alpha)-C(beta) ring cleavage reaction, 1-amino-2-methylenecyclopropane-1-carbo…
The conductivity of polyethylene oxide (PEO) is described with a three-dimensional hopping model considering electrostatic interactions between the ions. Ions fluctuate over energy-barriers in a multi-well potential. To decide whether positive or negative charges are responsible for this conductivity, the thermoelectr…
Abstract A new range of polymeric scale inhibitors has been developed combining exceptional scale control activity with enhanced adsorption properties. The polymers are stable up to at least 200ºC and have high activity against barium sulphate and calcium carbonate scales. By incorporating novel end-capped technology,…
In this study, α-Si3N4 particles were successfully coated with h-BN nano-film by a novel chemical route. Ammonium biborate was deposited onto the surface of silicon nitride particles to form NH4HB4O7·3H2O–Si3N4 composite powders by the heterogeneous precipitation method in anhydrous ethanol solution. The obtained comp…
The study of nucleation and growth mechanisms of salts from aqueous solutions, as a function of supersaturation, is described using both macroscopic and microscopic experiments. In situ observations in a fluid cell in an atomic force microscope (AFM) reveal phenomena not accounted for in standard crystal-growth theori…
Gold nanoparticles (2.2 nm) protected by a densely packed monolayer of 9-(9-fluorenyl)-nonane-1-thiol (MPC-b) or a mixed monolayer of 9-(9-fluorenyl)-alkane-1-thiol with nonane-1-thiol (MPC-c and MPC-d) were studied by transient spectroscopy upon 305 nm excitation with subpicosecond laser pulses. Electronic relaxation…
We report on molecular dynamics calculations of the thermal conductivity of superlattices in the direction parallel to the layers. We employ a simple, classical, fcc model that is designed to model the GaAs/AlAs system. Both rough and perfect interfaces are considered. The results are compared to experimental data fro…
The synthesis, characterization and initial reactivity studies are reported of the mixed-valence (Mn(IV)6Mn(III)2) title compound, which possesses an unusual serpentine-like core and is the highest average oxidation state (+3.75) Mn(x) (x > 4) cluster to date.
We determined the three-dimensional (3D) crystal structure of protein TM841, a protein product from a hypothetical open-reading frame in the genome of the hyperthermophile bacterium Thermotoga maritima, to 2.0 A resolution. The protein belongs to a large protein family, DegV or COG1307 of unknown function. The 35 kDa…
The electrical properties of a mixture of ethylene–propylene–diene monomer rubber and silicon carbide (SiC) have been measured as a function of filler concentration. It was found that mixtures containing angular SiC grains have a conductivity that displays not one, but two percolation thresholds. Different types of co…
The first hexabenzylhexaazaisowurtzitane cage compounds with trifluoromethyl and azide groups, as well as those with fluorine atoms in the 3- and 4-positions, have been prepared and fully characterized. A study of the substituent influence on the benzene ring regarding the formation of the hexaazaisowurtzitane polycyc…
Reaction of [V(VI)OCl(2)(thf)(2)] with a bidentate nitrogen-donor ligand (L: phen=1,10-phenanthroline, 5-mephen=5-methyl-1,10-phenanthroline, bipy=2,2'-bipyridine, 5,5'-me(2)bipy=5,5'-dimethyl-2,2'-bipy) in methyl alcohol, in the presence of triethylamine, leads to the formation of hexameric [V(2) (IV)V(4) (V)] oxo-al…
A novel amphiphilic GdPCTA-[12] derivative has been prepared. The complex formed micelles in aqueous solution with a relatively low CMC, 0.15 mM (25 degrees C). The concentration dependent T1-relaxivity (r1) of the system has been described. The maximum T1-relaxivity, 29.2 s-1 mM-1 (20 MHz, 25 degrees C), was higher t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPhotochemically Induced Fluorescence Control with Intermolecular Energy Transfer from a Fluorescent Dye to a Photochromic Diarylethene in a Polymer FilmSeiichiro Murase, Madoka Teramoto, Hidemitsu Furukawa, Yoshiharu Miyashita, and…
The light-harvesting dendrimer zinc porphyrin [NH 2 CH 2 CH 2 NHCO] 32 DPZn, a potential photosensitizer in photodynamic therapy, was synthesized and successfully assembled with poly(ethylene glycol)- b -poly(aspartic acid) to form micelles in PBS buffer (10 mM) following the concept of polyion complex micelle. The co…
YBaFe(2)O(5) has been synthesized by heating a nanoscale citrate precursor in a carefully controlled reducing environment. Successful synthesis of a single-phase sample can only be achieved in a narrow window of oxygen partial pressures and temperatures. YBaFe(2)O(5) adopts an oxygen-deficient perovskite-type structur…
Surface mobility in polystyrene (PS) films was studied using (PS/deuterated PS) bilayer films, which were prepared by attaching original two surfaces together. Time evolution of the bilayer interface at various temperatures was examined by dynamic secondary ion mass spectroscopy in conjunction with neutron reflectivit…