Materials Literature
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The process of protein crystallization often takes place too rapidly, thus producing showers of crystals instead of large single crystals. A novel technique for improving protein-crystal size by slowing down the crystallization process is described. This is achieved by the setting up of a vapour-diffusion experiment w…
The synthesis of dicyanooligothiophenes NC(C 4 H 2 S) n CN ( n = 3−6) is reported. For n = 3, 4, and 5 the dinitriles are generated by treatment of the corresponding dibromo compounds with copper(I) cyanide in quinoline. For n = 6 the preparation involves the Ni-catalyzed coupling of 5-bromo-2,2‘:5‘,2‘‘-terthiophene-5…
Growth of diamond has usually been discussed without invoking any form of surface diffusion. Our recent theoretical results identified, however, that bridging CH 2 and CCH 2 groups and radical vacancies can migrate on diamond {100} surfaces. The present work further explores migration of hydrogen atoms, bridging group…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTConformationally-Induced Geometric Electron Localization. Interrupted Conjugation, Very Large Hyperpolarizabilities, and Sizable Infrared Absorption in Simple Twisted Molecular ChromophoresIsrael D. L. Albert, Tobin J. Marks, and Mark A. RatnerView Author Information D…
A kinetic analysis of the microemulsion polymerization of hexyl methacrylate in mixed dodecyltrimethylammonium bromide/didodecyldimethylammonium bromide cationic microemulsions is developed and used to test mechanistic assumptions. In the limit of no bimolecular termination and fast radical capture, analytical express…
Experimental and theoretical studies of heat transport by lattice vibrations in thin film materials are reviewed. Selected examples of experimental methods are discussed to illustrate the wide variety of methods that have been developed for thin film measurements. Dielectric thin films are typically deposited at relat…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLamellar Multilayer Gold Cluster Films Deposited by the Langmuir−Blodgett TechniqueK. S. Mayya, V. Patil, and Murali SastryView Author Information Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India Cite this: Langmuir 1997, 13, 9, 2575–2577Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSolvent-Dependent Swelling of Poly(amido amine) Starburst DendrimersStefan Stechemesser and Wolfgang EimerView Author Information Department of Chemistry, University of Bielefeld, P.O. Box 10 01 31, D-33 501 Bielefeld, GermanyCite t…
Other| April 01, 1997 Crystal structure of monoclinic hydrous wadsleyite [β-(Mg,Fe)2 SiO4 ] Joseph R. Smyth; Joseph R. Smyth University of Colorado, Department of Geological Sciences, Boulder, CO, United States Search for other works by this author on: GSW Google Scholar Tatsuhiko Kawamoto; Tatsuhiko Kawamoto Search f…
The use of the split Hopkinson pressure bar (SHPB) techniques for materials testing under a high rate of loading is described, including various modifications of the original compression testing set-up for tension testing, torsion testing and dynamic fracture testing. Details of measurement techniques and instrumentat…
Total energies, electronic structure, surface energies, polarization, potentials and charge densities were studied for slabs of BaTiO3 using the Linearized Augmented Plane Wave (LAPW) method. The depolarization field inhibits ferroelectricity in the slabs, and the macroscopic field set up across a ferroelectric slab i…
We present an investigation of the mechanisms of mechanical reinforcement at interfaces between polypropylene (PP) and polyamide-6 (PA6), associated with the incorporation of a small amount of maleic anhydride functionalized PP (PP- g -MA) which reacts with the NH 2 groups of the PA6 to form a copolymer in situ. In a…
The pressure dependence of the 100 K spin-state transition in LaCoO 3 is investigated through magnetization measurement under pressures of up to 18.2 kbar. The energy gap, Δ, between the low-spin ground state and the excited magnetic state (intermediate spin) increases remarkably with increasing pressure. The linear p…
Dielectric relaxation processes in an antiferroelectric liquid crystal (AFLC) have been investigated over a wide range of frequencies from 1 Hz to 1 GHz. The AFLC under investigation possesses a variety of different ferrielectric, ferroelectric, and antiferroelectric phases. Dielectric and polarization measurements un…
By use of low-temperature (20 K) confocal microscopy, fluorescence spectra of isolated single CdS nanocrystals have been recorded. The narrowest measured line width of the main fluorescence band has been determined to be about 5 meV at the lowest excitation intensities. At higher intensities at least three additional…
Evolutionary analysis indicates that eubacterial NADP-dependent isocitrate dehydrogenases (EC 1.1.1.42) first evolved from an NAD-dependent precursor about 3.5 billion years ago. Selection in favor of utilizing NADP was probably a result of niche expansion during growth on acetate, where isocitrate dehydrogenase provi…
We report a study of the physical and electrochemical properties of two-component self-assembled monolayers (SAMs) composed of both electroactive (4-aminothiophenol, 4-ATP) and electroinactive ( n -octadecanethiol, ODT) species. In all of the experiments reported here, relatively short (3 h) assembly times were used t…
Single‐phase perovskite 0.9Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.1PbTiO 3 (0.9PMN–0.1 PT) from a stoichiometric mixture of starting materials was synthesized by applying a mechanochemical technique to the stage of a precursor. A stoichiometric mixture of PbO, TiO 2 , Mg(OH) 2 , and Nb 2 O 5 was milled for 60 min and heated at temp…
The xpt and pbuX genes from Bacillus subtilis were cloned, and their nucleotide sequences were determined. The xpt gene encodes a specific xanthine phosphoribosyltransferase, and the pbuX gene encodes a xanthine-specific purine permease. The genes have overlapping coding regions, and Northern (RNA) blot analysis indic…
Yttria–doped ceria powder was prepared from oxalate precursors. The oxalate coprecipitation bath parameters were closely monitored and found to influence the sintering behavior of the subsequently obtained oxide powders strongly. The use of concentrated (Ce,Y) metal nitrate solutions and dilute neutralized oxalic acid…