Materials Literature
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Abstract Scale formation of calcium carbonate on tube walls is studied in a once‐through flow system under isothermal conditions. The effects of supersaturation ratio, flow velocity and liquid temperature on the deposition rates are investigated. For relatively small supersaturation ratios (in the range 3.5 to 8) the…
An off-lattice pseudocontinuous model for semiflexible polymerlike micelles with excluded volume interactions is presented. Expansion factors are determined for the radius of gyration squared and for three different characteristic point-point distances squared. They are found to scale with an exponent in agreement wit…
The electrochemical behavior of chemically vapor deposited tungsten films in solutions of interest to tungsten chemical mechanical polishing has been investigated using dc potentiodynamic polarization, linear polarization, and Tafel methods. It was found that in the absence of an oxidizer, the tungsten surface was pas…
The recent novel temperature modulated differential scanning calorimetry (MDSCTM TA Instruments Inc. USA) technique has been applied to the measurement of the thermal properties of chalcogenide glasses of the As-Se system in the glass transition region. All samples in this work were given the same thermal history by h…
Supramolecular wires and channels are one‐dimensional molecular materials capable of transporting charge, etc. in a predefined direction. Examples are given of wires and channels that have been formed by self‐assembly in the liquid‐crystalline state or in solution, for example from alkoxy‐substituted triphenylenes (se…
Abstract cis- and trans-bis(1-methyl-2-imidazolyl)tetraethyltetramethylporphyrin Mg complexes were prepared. 1H NMR, absorption, and fluorescence spectra suggest that Mg has a high tendency toward dimer formation through coordination from imidazolyl to metal in a similar way to Zn, and accepts further the sixth coordi…
Abstract We describe the synthesis of micro‐phase‐segregated block‐copolyesterurethanes from telechelic hydroxyterminated poly{[( R )‐3‐hydroxybutyric acid]‐ co ‐[( R )‐3‐hydroxyvaleric acid]} (PHB‐diol) as “hard segments” (i. e., crystallizable chain sections) and hydroxyterminated poly(ε‐caprolactone)‐diethylene gly…
To further investigate the ways in which proteins respond to changes in the length of the polypeptide chain, a series of 32 insertions and five deletions were made within nine different alpha-helices of T4 lysozyme. In most cases, the inserted amino acid was a single alanine, although in some instances up to four resi…
Electrical transport in zinc oxide varistors is simulated using two-dimensional Voronoi networks. The networks are assumed to contain randomly distributed grain boundaries of three electrical types: (1) high nonlinearity (i.e., ‘‘good’’) junctions; (2) poor nonlinearity (i.e., ‘‘bad’’) junctions; and (3) linear with l…
The rheological properties of nonaqueous silicon nitride powder suspensions have been investigated using steady shear and viscoelastic measurements. The polymeric dispersant, Hypermer KD‐3, adsorbed strongly on the powder surfaces, and colloidally stable, fluid suspensions up to a volume fraction of φ= 0.50 could be p…
A trichloroacetic-acid-soluble 14.5-kDa protein (p14.5) has been isolated from human mononuclear phagocytes (MNP) by a combination of trichloroacetic acid extraction, preparative electrophoresis and hydrophobic affinity chromatography; five tryptic peptides were subjected to protein sequencing. The full-length cDNA of…
The Curie temperature of normally sintered and hot‐pressed Pb 1‐x Ba x Nb 2 O 6 ( x = 0.30, 0.37, 0.41, and 0.50) was dependent on the sample preparation conditions. Samples with large amounts of pores and cracks had higher Curie temperatures than dense samples. Dense samples with fine grains had higher Curie temperat…
The tungsten divertor experiment at ASDEX Upgrade , R Neu, K Asmussen, K Krieger, A Thoma, H-S Bosch, S Deschka, R Dux, W Engelhardt, C García-Rosales, O Gruber, A Herrmann, A Kallenbach, M Kaufmann, V Mertens, F Ryter, V Rohde, J Roth, M Sokoll, A Stäbler, W Suttrop, M Weinlich, H Zohm, M Alexander, G Becker, K Behle…
, This paper addresses the development of an image analysis technique for direct tracking of fibers in an assembly. The algorithms are evaluated using simulated images presented in an earlier part of the series. The tracking method appears to be extremely efficient in determining fiber orientation distribution in nonw…
The purification and opening of carbon nanotubes via bromination is reported. Refluxing raw cathodic soot containing a mixture of nanotubes, nanoparticles, and amorphous carbon in liquid bromine, followed by oxidation in air, is shown to yield 10–20; w/w pure and opened nanotubes. The role of bromine in the purificati…
Trinuclear gold(I) pyrazolate complexes of type 1 show liquid crystalline phases at room temperature. The molecules are arranged in a hexagonal columnar structure. The mesogenic behavior of these compounds is strongly related to the molecular symmetry, which is determined by the substituents R and R′. R = 3,4-(H21C10O…
Three‐dimensional quantum dot superlattices with fcc structure have been formed using reverse micelles and self‐organization of Ag 2 S nanocrystals. It is reported that the size distribution of the nanoparticles can be narrowed by a chemical treatment of the interface and by particle extraction from the micelles. The…
Charge ordering in ${L}_{1\ensuremath{-}x}{A}_{x}\mathrm{Mn}{\mathrm{O}}_{3} (L=\mathrm{rare}\mathrm{earth}, A=\mathrm{C}\mathrm{a},\phantom{\rule{0ex}{0ex}}\mathrm{S}\mathrm{r})$) depends strongly on the width of the ${e}_{g}$ band or on the average radius of the $A$-site cations, $〈{r}_{A}〉$. Investigations of ${\ma…
Neutron powder diffraction techniques have been used to refine the crystal and magnetic structures of the Ruddlesden Popper (RP) compounds ${\mathrm{Sr}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Nd}}_{1+\mathit{x}}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ (x=0.0, 0.1), which show colossal magnetoresistance below 10…
In situ high-resolution interferometry on horizontal facets of the protein lysozyme reveal that the local growth rate $R$, vicinal slope $p$, and tangential (step) velocity $\ensuremath{\nu}$ fluctuate by up to 80% of their average values. The time scale of these fluctuations, which occur under steady bulk transport c…