Materials Literature
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Cellulose triacetate (CTA) fibers were partially hydrolyzed in 0.054 N solutions of NaOH/H(2)O and NaOMe/MeOH. The surface concentration of acetyl groups was determined using ATR-FTIR. Total acetyl content was determined by the alkaline hydrolysis method. Fiber cross-sections were stained with Congo red in order to ex…
Controlled mechanochemical reduction of NiO has been carried out by room-temperature ball milling under H 2 atmosphere. During the milling, a gradual conversion of NiO into Ni occurs, with no intermediate phases being formed. The amount of Ni and its crystallite size can be tuned by the ball-milling parameters, leadin…
Outdoor insulation materials not only have to withstand the electric field during service; they also must be resistant against ageing phenomena by dust and humidity. Water drops from dew or rainfall play an important role. Research work has been done on the damaging effects of water drop corona to insulating materials…
Electrical measurements were conducted on different polymer compounds consisting of polypropylene (PP) and polyaniline. Both undoped polyaniline (PANI emeraldine base) and doped PANI blended with PP were studied. Electrical permittivity, loss factor and breakdown voltages with dc, ac and lightning impulse (LI) voltage…
Our work was to study the influence of temperature from 20/spl deg/C to 80/spl deg/C on space charge formation on low-density polyethylene, with and without antioxidant. The pulsed electro-acoustic (PEA) method and DC conduction measurements were used to follow the space charge formation under high electric field (55…
Dual excited states of nickel(II) meso-tetra(4-sulfonatophenyl)porphyrin (NiTPPS) and nickel(II) meso-tetraphenylporphyrin (NiTPP) have been investigated by two-pump-one-probe transient absorption spectrometry. By dual excited states, we mean molecular entities that have absorbed two photons to generate molecular stat…
Self-assembled and well aligned RuO 2 nanorods (NRs) have been grown on sapphire (SA) substrates via metal–organic chemical vapour deposition (MOCVD), using bis(ethylcyclopentadienyl)ruthenium as the source reagent. The surface morphology, structural, and spectroscopic properties of the as-deposited NRs were character…
We describe the synthesis of mixed, or binary, polymer brushes containing polystyrene (PS) and poly(methyl methacrylate) (PMMA). These films were synthesized by a grafting-from (GF) strategy from gold substrates that were coated with a bis-thiol free radical photoinitiator, similar to 2,2‘-azobis(isobutyronitrile) (AI…
This paper reports our novel approach in an attempt to grow high-density gold nanoparticles on an indium tin oxide (ITO) surface using an improved “touch” seeding technique, instead of the “normal” seeding approach, in a seed-mediated growth procedure as we reported previously [Kambayashi et al., Cryst. Growth Des. 20…
In vitro evolution of the polyhydroxyalkanoate (PHA) synthase gene from Pseudomonas sp. 61-3 (phaC1(Ps)) has been performed to generate highly active enzymes. In this study, a positive mutant of PHA synthase, Glu130Asp (E130D), was characterized in detail in vivo and in vitro. Recombinant Escherichia coli strain JM109…
Spin-frustrated polyoxometalates, K(11)H[(VO)(3)(SbW(9)O(33))(2)].27H(2)O (1) and K(12)[(VO)(3)(BiW(9)O(33))(2)].29H(2)O (2), containing approximately equilateral and isosceles (VO)(3)(6+)-triangles (V(IV)...V(IV) separation of 5.4-5.5 A) sandwiched by two diamagnetic alpha-B nonatungstate ligands ([SbW(9)O(33)](9)(-)…
Single Wall Carbon Nanotubes (SWNTs) are insoluble in most organic solvents, such as toluene. Improvements in the solubility of the SWNTs are, however, seen as a result of interaction with dye molecules such as terphenyl and anthracene. The suspensions formed are stable for periods greater than 24 months. Spectroscopi…
The Vogel−Fulcher−Tammann−Hesse (VFTH) equation has been the most widespread tool for describing the temperature dependence of the characteristic times of the cooperative dynamics of glass-forming liquids, both in low-molecular-weight and macromolecular systems near and above the glass transition temperature. Previous…
Synthetic samples of the pyrochlores La 2 Zr 2 O 7 and La 2 Hf 2 O 7 were irradiated in situ in the intermediate voltage electron microscope (IVEM-Tandem Facility) at Argonne National Laboratory using 1.0 MeV Kr 2+ . Results of this study demonstrate that both pyrochlores pass through the crystalline–amorphous transfo…
Solvothermal synthesis affords access to the first truly three-dimensional antimony-sulfide framework which contains one-dimensional circular channels.
Carboxylic acid-terminated polystyrene (PS) of different molecular weights from 4500 to 672 000 was grafted from melt onto silicon substrates modified with a macromolecular anchoring layer. The study was focused on influence of thickness and molecular weight of the layer on the permanent attachment of the end-function…
A series of novel hyperbranched hydrogen-bond acidic polymers for surface acoustic wave (SAW) sensor applications were prepared by functionalizing hyperbranched polycarbosiloxanes or polycarbosilanes with phenol or hexafluoro-2-propanol groups. Starting polymer, sensor polymer, and reagent structures were confirmed by…
The polycatenar bent-shaped molecules are able to form columnar phases with column stratum built of few molecules, arranged in coplanar or conelike geometry. In the latter case, the phase becomes axially polar, with electric spontaneous polarization reorientable in the electric field by flipping the cone axis. The pha…
Electrochemical doping properties and morphology changes of electropolymerized poly( N -vinylcarbazole) (PVK) thin films were investigated toward improved hole-injection/transport properties in polymer light emitting diode (PLED) devices. The conjugated network polycarbazole thin films (resulting from a poly( N -carba…
Large-scale synthesis of carbon nitride nanotubes was carried out by a catalytic-assembly solvothermal route involving the reaction of cyanuric chloride (C3N3Cl3) with sodium using NiCl2 as catalyst precursor. The carbon nitride nanotubes with the CN stoichiometry are orderly assembled as bundles and have an outer dia…