Electrogenerated poly(dendrimers) containing conjugated poly(thiophene) chains
Electroactive conjugated polymers have been synthesized by electropolymerisation of increasing generations of dendrimers derivatized by peripheral bithiophene groups.
Materials Literature
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Dinuclear and tetranuclear copper(II) complexes with bridging (N–N) diazine ligands: variable magnetic exchange topologies †
Dinuclear and tetranuclear copper(II) complexes of three polydentate diazine ligands (pahap, pmhap, bdpah), based on potentially bridging N–N single bond fragments, are reported. The 2∶2 complexes [Cu2(pahap)2(NO3)(H2O)2][NO3]3·H2O (1) and [Cu2(pmhap)2(NO3)2][NO3]2·3H2O (2) involve dinuclear centres bridged by two N–N…
Electrodeposition of βʹ-Brass from Cyanide Baths with Accumulative Underpotential Deposition of Zn
Cu‐Zn alloys were deposited under potentiostatic conditions from cyanide baths with varied Cu + / Zn 2 + concentration ratio but with the same free CN − concentration. The Zn content of the deposits showed the maximum at around −1.4 V vs. Ag/AgCl as a function of the applied potential. The deposits obtained at −1.4 V…
The Electrochemical Properties of Nanocrystalline Diamond Thin‐Films Deposited from C 60 /Argon and Methane/Nitrogen Gas Mixtures
Nanocrystalline diamond thin-films have been synthesized in CH4/Ar (argon) and CH4/N2 gas mixtures without the addition of molecular hydrogen. Atomic force microscopy analysis demonstrates that the C60/Ar films consist of hemispherical features about 150 nm in diameter with a height of 20 nm. The mean roughness over a…
Sheared foam as a supercooled liquid?
We conduct numerical simulations on a simple model of a two-dimensional steady-state sheared foam, and define a quantity Γ that measures stress fluctuations in the constant-area system. This quantity reduces to the temperature in an equilibrium system. We find that the relation between the viscosity and Γ is the same…
Template-Assisted Growth of Hexagonal Poly- or Single-Crystalline Quasi-2D Palladium Nanoparticles
Reducing the dimensionality can dramatically improve the physical properties of some compounds. Quasi two-dimensional palladium nanoparticles have been obtained using a graphite lattice as a template. The hexagonal symmetry of the carbon host lattice was found to impose a hexagonal symmetry on the Pd atoms (see Figure…
Spectroscopic investigation of thermal treatment of doped polypyrrole
The results of a UV/VIS spectroscopic investigation of thin films of oxidized polypyrrole doped with p-toluenesulfonate, dodecylsulfate or copper phthalocyanine tetrasulfonate anions immediately after electrochemical synthesis and during heat treatment are presented. The absorption bands in the resulting spectra were…
Properties of crosslinked polyurethanes synthesized from 4,4?-diphenylmethane diisocyanate and polyester polyol
Polyurethanes were synthesized using the high functional 4,4′-diphenylmethane diisocyanate (MDI), polyester polyol, and 1,4-butane diol. The synthesized polyurethanes were analyzed using differential scanning calorimeter (DSC), dynamic mechanical thermal analysis (DMTA), Fourier transform infrared (FTIR) spectrometer,…
Novel Biodegradable Polyurethanes for Medical Applications
Biodegradable polyurethanes with various hydrophilic-to-hydrophobic ratios and potential application for nonadhesive barriers in surgery and/or scaffolds for tissue engineering and bone substitutes were synthesized from polycaprolactone diol, mixtures of polycaprolactone and polyethylene oxide diols, hexamethylene- an…
High dielectric constant (Ba0.65Sr0.35)(Ti0.41Zr0.59)O3 capacitors for Gbit-scale dynamic random access memory devices
High dielectric constant (Ba0.65Sr0.35)(Ti0.41Zr0.59)O3 (BSTZ) thin films were prepared on Pt/Ti/SiO2/Si substrates at 500 °C from the target composition of (Ba0.65Sr0.35)(Ti0.65Zr0.35)O3 by the rf magnetron sputtering technique and evaluated as a function of annealing temperature. The 95-nm-thick BSTZ films showed a…
Anion Rotation and Cation Transport in the Rotor Phase α -Sodium Orthophosphate: Paddle-Wheel Mechanism Redefined in View of New Experimental Results
The high-temperature phase of sodium ortho-phosphate, α -Na
Microwave discharge-assisted catalytic conversion of NO to N2
By coupling microwave discharge with an Fe/HZSM-5 catalyst, novel effects have been observed for the conversion of NO to N2 in the presence of excess oxygen with high efficiency.
Hyperbranched porphyrins—a rapid synthetic approach to multiporphyrin macromolecules
A new class of porphyrin containing hyperbranched polymers has been prepared via proton-transfer polymerisation utilising an A2 + B3 approach, thus providing an accelerated entry into the construction of branched multiporphyrin architectures.
Polyion complex fiber and capsule formed by self-assembly of poly-L-Lysine and gellan at solution interfaces
Different characteristic surface structures such as capsules, regularly spaced droplets, and fibers are formed by electrostatic interaction between poly-L-lysine (PLL) and gellan gum via polyion complex (PIC) formation. Spherical droplet PIC capsules of varying diameters form in solutions. Some dyes adsorb on the surf…
Organic–inorganic hybrid materials. Preparation and properties of dibenzo-18-crown-6 ether-bridged polysilsesquioxanes
Dibenzo-18-crown-6 ether derivatives bearing two (1, 2) or four (3) hydrolysable Si(OR)3 groups have been synthesised. Their hydrolysis and polycondensation gave rise to new hybrid organic–inorganic materials incorporating dibenzo-18-crown-6 ether moieties covalently linked to silica by two or four Si–C bonds. The com…
Surface microarchitectural design in biomedical applications:In vivo analysis of tissue ingrowth in excimer laser-directed micropored scaffold for cardiovascular tissue engineering
A micropatterned microporous segmented polyurethane film (20 x 12 mm in size, 30 micrometer thick) with four regions was prepared by excimer laser microprocessing to provide an in vivo model of transmural tissue ingrowth in an open cell-structured scaffold specially designed for cardiovascular tissue engineering. Thre…
Cyclo-depolymerisation of poly(ethylene naphthalene-2,6-dicarboxylate) and ring-opening polymerisations of the cyclic oligomers obtained
Commercial poly(ethylene naphthalene-2,6-dicarboxylate) (PEN) was cyclo-depolymerised by treatment of a suspension in 1,2-dichlorobenzene at 180 °C with 3 mol% of di-n-butyltin oxide as a catalyst. The cyclic oligomers, produced in up to 93% yield, were characterised by gel permeation chromatography, 1H NMR spectrosco…
A versatile route to organically-modified silicas and porous silicas via the non-hydrolytic sol–gel process
The non-hydrolytic sol–gel route has been used to provide a versatile synthesis of organically-modified silicas (ormosils), via a rapid, facile reaction in the absence of any solvent. The ormosils are synthesised by reaction of silicon halides with alkoxides, where one or both of the reactants contains the organic sub…
In Situ and Ex Situ Studies of Imidazole and Its Derivatives as Copper Corrosion Inhibitors. II. AC Impedance, XPS, and SIMS Studies
The objective of this work was to investigate the efficiency of imidazole derivatives for corrosion inhibition of copper in 0.5 M hydrochloric acid. Corrosion inhibition was studied using impedance spectroscopy. Imidazole and its derivatives 4‐methylimidazole, 4‐methyl‐5‐hydroxymethylimidazole, 1‐phenyl‐4‐methylimidaz…
Synthesis and characterization of new soluble polyesters derived from various cardo bisphenols by solution polycondensation
A series of new polyesters was prepared from terephthaloyl (or isophthaloyl) chloride acid with various cardo bisphenols on solution polycondensation in nitrobenzene using pyridine as hydrogen chloride quencher at 150 °C. These polyesters were produced with inherent viscosities of 0.32–0.49 dL · g−1. Most of these pol…