Materials Literature
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The thermal properties of a suspended metallic single-wall carbon nanotube (SWNT) are extracted from its high-bias (I-V) electrical characteristics over the 300-800 K temperature range, achieved by Joule self-heating. The thermal conductance is approximately 2.4 nW/K, and the thermal conductivity is nearly 3500 Wm(-1)…
A nickel layer has been inserted between the perovskite blocks of triple-layer Ruddlesden−Popper titanate Li 2 La 2 Ti 3 O 10 by ion exchange. The reaction takes place at low temperature (50−65 °C) in aqueous solution. Rietveld refinement of X-ray powder diffraction data indicates that Li 0.3 Ni 0.85 La 2 Ti 3 O 10 ha…
In the framework of a recently proposed topological approach to phase transitions, some sufficient conditions ensuring the presence of the spontaneous breaking of a symmetry and of a symmetry-breaking phase transition are introduced and discussed. A very simple model, which we refer to as the hypercubic model, is intr…
The conformation of linear−dendrimer hybrid diblock copolymers in solution has been studied using both small-angle neutron scattering and dynamic light scattering. The diblock consisted of a fourth-generation benzyl ether dendrimer with different molecular weight polystyrene bonded to the focal point of the dendrimer;…
We propose a three-order-parameter model to study the phase separations in a diblock copolymer–diblock copolymer mixture. The cell dynamical simulations provide rich information about the phase evolution and structural formation, especially the appearance of onion-rings. The parametric dependence and physical reason f…
Abstract Multiwalled carbon nanotubes (MWNTs) coated with CeO2 and SnO2 nanoparticles were successfully prepared by microwave-polyol process. The samples are characterized by XRD, TEM, HRTEM, and UV–vis analysis. SnO2 and CeO2 nanoparticles are homogeneously distributed on the wall of the MWNTs.
Abstract The controlled hydrolysis of 1,1,3,5,7,7-hexaisocyanato-1,3,5,7-tetramethyltetrasiloxane in tetrahydrofuran gave the desired cyclotetrasiloxane which is expected to be a building block for novel ladder oligosiloxanes with anti configuration, in contrast to the conventional ladder oligosiloxanes with syn confi…
We have carried out differential scanning calorimetric and dielectric studies on composites of hydrophilic aerosil with a liquid crystal that does not possess a terminal polar group. While the shift in the nematic–isotropic transition temperature is in agreement with the general behaviour observed for such composites,…
Abstract We have designed and synthesized novel perfluorinated polyimides with 3D controlled structure. At first, we successfully developed the new synthetic routes to diamines with pendant bulky perfluorinated aromatic units in a multi‐step synthetic procedure. Novel perfluorinated polyimides were prepared in a two‐s…
Abstract Carbon nanotubes were prepared by catalytic chemical vapor deposition using washable catalyst support of barium and calcium chlorides. It was found that under this experimental condition, carbon nanotubes with cone-like heads are formed. This special shape guarantees easier diffusion and transfer inside the c…
Atomistic models were used to determine the properties of dislocation core fields and stacking fault fields in Al and Cu using embedded atom method (EAM) potentials. Long-range, linear elastic displacement fields due to nonlinear behaviour within dislocation cores, the core field, for relevant combinations of Shockley…
Tapered carbon nanotubes (TCNTs) are produced from activated carbon powders via simple thermal catalytic reactions in which the carbon nanotubes grow though a Sn-catalyzed vapor–liquid–solid growth process. The tapered nanotubes are well aligned and have a length of several tens of micrometers (see Figure).
A series of alkali metal azide-crown ether complexes, [Li([12]crown-4)(N3)], [Na([15]crown-5)(N3)], [Na([15]crown-5)(H2O)2]N3, [K([18]crown-6)(N3)(H2O)], [Rb([18]crown-6)(N3)(H2O)], [Cs([18]crown-6)(N3)]2, and [Cs([18]crown-6)(N3)(H2O)(MeOH)], has been synthesised. In most cases, single crystals were obtained, which a…
The inhibition of copper corrosion by benzotriazole (BTAH) has been studied by scanning electrochemical microscopy as a function of time and oxygen content. Under normal atmospheric conditions the inhibiting [Cu(I)-BTA] film was formed in approximately . When the oxygen content was lowered below , an insulating film c…
Preparation of mixed metal oxide precursors for solid oxide fuel cells represents a very complex chemical process in which a metal may form oxides, hydroxides and various complex basic salts as intermediates. A detailed study to determine the relationship between synthesis strategies, morphology, sinteractivity and SO…
Uniform, well-ordered, mesoporous organosilicate films (see Figure) have been synthesized by efficient direct and post-synthesis functionalization methods in supercritical carbon dioxide and characterized using spectroscopic, microscopy, and diffraction techniques. These materials have numerous potential applications,…
The electrical transport and chemical sensing properties of single-walled carbon nanotube field effect transistors (SWNT-FETs) coated with metal clusters have been investigated. The source-drain current passing through an SWNT-FET coated with Pd nanoparticles showed no change over a range of gate voltages. Nevertheles…
A gold nanocomposite made soluble in both water and oil by the addition of a second adsorption layer of poly-N-vinyl-2-pyrrolidone on gold nanoparticles that have been made hydrophobic, Yang, Yun, Li, Jinru, Mu, Jin, Rong, Huilin, Jiang, Long
Es wird Licht: Kohlenstoffnanoröhren aus ineinander gestapelten offenen Kegeln (SCCNTs) wurden im Gleichstromfeld aus THF-Suspension elektrophoretisch auf leitende Glaselektroden abgeschieden (siehe Bild). In diesen Filmen tritt Ladungstrennung auf, und sie liefern bei Bestrahlung mit sichtbarem Licht einen Photostrom…
Abstract Electrically conductive composites were prepared using epoxy resin (EP) as matrix and nickel‐coated polyethylene teraphthalate (PET) fibers as filler. The fibers were coated with nickel by plating and ultrasonic electroless deposition techniques. The coaxial transmission line method was used to measure the el…