Convergent synthesis and ‘surface’ functionalization of a dendritic analog of poly(ethylene glycol)
Aliphatic polyether dendrons exhibit easily modified surface functionality.
Materials Literature
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Surface free energy of polymeric materials : relevancy of conventional contact angle data analyses
To analyze various approaches for the determination of surface free energies of solids from liquid-solid contact angles, comb-like polymers with controlled grafting rates and macromolecular structures have been synthesized. The surface free energy parameters were calculated from the contact angles of standard liquids…
Extracellular matrix of fish and shellfish.
This publication contains 9 papers on work carried out in a research project supported by the Ministry of Education and Culture of Japan, the Department of Primary Industries, Queensland, Australia, and the Danish Institute for Fisheries Research. The papers cover (1) characterization of fish type-I collagen, (2) mino…
Modeling the effects of torsional stress on hysteretic magnetization
Opposite torques applied axially to a polycrystalline ferromagnetic rod result in tensile and compressive stresses acting perpendicularly at the rod surface at 45/spl deg/ to the rod axis. These stresses affect the magnetization of the rod when a magnetic field is applied parallel to the rod axis. It is shown how one…
Benchmarks for Submerged Structure Response to Underwater Explosions
Benchmarks for submerged structure response to underwater explosions (UNDEX) are compiled. Both analytical and empirical benchmarks are presented; each type has advantages and disadvantages for the purposes of model validation, though no methodology for employing these benchmarks in a model validation effort is propos…
Casein related amyloid, characterization of a new and unique amyloid protein isolated from bovine corpora amylacea
Amyloid bodies can be found in mammary secretory tissue of various species. These corpora amylacea (CA) have a lamellated structure, contain amyloid fibrils and are predominantly located in the alveolar lumina. The nature of the amyloid was not known, but CA were suggested to originate either from milk casein or mamma…
Effect of strength of intergrain exchange interaction on magnetic properties of nanocomposite magnets
Micromagnetic calculation using a discrete model was applied to computer simulation of the magnetic properties of nanocomposite magnets, and the effect of the strength of the intergrain exchange interaction on magnetic properties was studied. A reduction of the strength of the intergrain exchange interaction suppresse…
Structure and relaxivity of macrocyclic gadolinium complexes incorporating pyridyl and 4-morpholinopyridyl substituents
Octadentate N5O3 ligands containing a coordinating pyridyl group form kinetically stable complexes with Eu and Gd that resist protonation; the structure of a representative Gd complex reveals a short Gd–Npy bond [2.535(1) Å], and the water exchange rate (kex298=2.7×106 s-1) is sufficiently fast so as not to limit the…
Synthesis and crystal structures of cationic lanthanide(III) monoporphyrinate complexes
Reactions of an excess of Ln[N(SiMe3)2]3·x[LiCl(THF)3], generated in situ from the reaction of anhydrous LnCl3 with 3 equivalents of Li[N(SiMe3)2] in tetrahydrofuran, with 5,10,15,20-tetrakis(p-methoxyphenyl)porphyrin (H2TMPP) in refluxing tetrahydrofuran–bis(2-methoxyethyl) ether solution (1∶6 v/v) gave the cationic…
Quickly screen solvents for organic solids
In this article, we will review a number of methods used to estimate the solubility in a wide variety of solvents. These methods can help in putting together a list of candidate solvents to test in the laboratory. To illustrate the utility and limitations of these methods, we will discuss how to use them to identify c…
Effect of geometric changes on the flow and heat transfer in the end region of a TEFC induction motor
The flow and heat transfer in the end region of a TEFC motor fitted with a 2-pole high-voltage winding have been predicted and measured in a full-scale model replicating the internal geometry. The work reported here examined the response of the flow and heat transfer coefficients to changes in the wafter size and numb…
Novel square-planar cyclic tetranuclear copper(II) complex containing oximate bridges. Synthesis, crystal structure and magnetic properties of tetrakis[diaqua(μ-1,3-dimethylviolurato)copper(II)] tetraperchlorate dihydrate
The tetranuclear complex [Cu4(L)4(H2O)8][ClO4]4·2H2O (HL = 1,3-dimethylvioluric acid, i.e. 1,3-dimethyl-5-(hydroxyimino)-2,4,6(1H,3H,5H)-pyrimidinetrione) has been prepared and its crystal structure determined by X-ray diffraction methods. The structure consists of a tetranuclear cation [Cu4(L)4(H2O)8]4+, four non-co-…
Relative basicities of the oxygen atoms of the Linquist polyoxometalate [Mo6O19]2− and their recognition by hydroxyl groups in radical cation salts based on functionalized tetrathiafulvalene π donors
Electrocrystallization of three hydroxylated donor molecules derived from tetrathiafulvalene (TTF) or ethylenedithiotetrathiafulvalene (EDT-TTF), i.e. Me3TTF-CH2OH, EDT-TTF(CH2OH)2 and TTF(CH2OH)4, in the presence of [n-Bu4N+]2[Mo6O19]2– afforded 2∶1 cation radical salts, [donor+˙]2[Mo6O19]2–, whose crystal structures…
Transient photoconduction in discotic liquid crystals
The hole transport properties of ester substituted hexaalkyloxytriphenylenes are investigated and compared with the materials without ester substituents. The high hole mobilities of the recently investigated discotic liquid crystals of the hexaalkyloxytriphenylene-type are restricted to the very small temperature rang…
A theoretical study on the catalysis of Cu-exchanged zeolite for the decomposition of nitric oxide
The catalysis of Cu-exchanged zeolite for the direct decomposition of nitric oxide was investigated by hybrid density functional theory (B3LYP) using a molecular model of the active site. For reactions of two NO molecules over a Cu ion bound to the zeolite model (ZCu), the structures and energies of adsorption complex…
Regioregular poly[3-butyl-2,5-thienylene-alt-1,4-phenylene]: synthesis, preliminary characterization aspects and application in the fabrication of light-emitting diodes
A novel regioregular polymer comprising alternating 1,4-phenylene and 3-butyl-2,5-thienylene repeat units has been synthesized and characterized using 1 H NMR, FTIR, UV-VIS absorption and fluorescence emission spectroscopy. The derived polymer showed strong fluorescence with a solution quantum yield of 48% relative to…
Synthesis and polymerization of fluorinated monomers bearing a reactive lateral group. Part 10. Copolymerization of vinylidene fluoride (VDF) with 5-thioacetoxy-1,1,2-trifluoropentene for the obtaining of a novel PVDF containing mercaptan side-groups
The synthesis of novel perfluorovinyl thioacetoxy monomer (FSAc) and its copolymerization with vinylidene fluoride (VDF; also called 1,1-difluoroethylene) are presented. This monomer was obtained in good yield from the photochemical addition of thiol acetic acid to 1,1,2-trifiuoro-1,4-pentadiene. It was first hydrolyz…
Dynamic local distortions in KNbO3
Molecular dynamics simulations of the perovskite oxide KNbO 3 are performed with a first-principles effective Hamiltonian. They reveal the prevalence of local polar distortions with short-range chain-like correlations, present even in the paraelectric phase far above T c . The ordering of these dynamically fluctuating…
Orthorhombic standardization of spin-Hamiltonian parameters for transition-metal centres in various crystals
Several sets of non-standard zero-field splitting (ZFS) parameters in the spin Hamiltonian (SH) for transition-metal ions at orthorhombic or lower symmetry sites in various crystals have been revealed by a recent literature survey. The standardization limits the ratio of the orthorhombic ZFS parameters: (conventional)…
MCM-41 heterogenised titanium silsesquioxane epoxidation catalysts: a spectroscopic investigation of the adsorption characteristics
This paper describes a spectroscopic study of the heterogenisation of a novel liquid-phase epoxidation catalyst, a titanium(IV) silsesquioxane complex. Its immobilisation is performed exclusively via a straightforward adsorption of the homogeneous catalyst, i.e. the metal complex, in the pores of an MCM-41 host materi…