Materials Literature
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Hydrophilic and adherent polypyrrole coatings were prepared by a two-step electrochemical method. First, α-pyrrole, ω-acrylate polyethylene oxide (Py-PEO-A) dual macromonomer was synthesized by anionic polymerization and electrografted onto (semi)conducting substrates by cathodic polymerization of the acrylic end-grou…
Sb 2 S 3 thin films have been obtained by physical vapour deposition on LiNbO 3 and glass substrates. Films with amorphous structure originally became polycrystalline by annealing in a sulfur atmosphere. Changes in optical and structural properties have been studied as a function of annealing temperature. A drastic va…
In this study, well-dispersed single-walled carbon nanotubes (SWNTs) were successfully incorporated into a supramolecular hydrogel through combining dual roles of Pluronic copolymer in dispersing SWNTs and forming inclusion complexes with α-cyclodextrin (α-CD). Such hydrogel hybridized with SWNTs was prepared by mixin…
The interaction of emeraldine base polyaniline (EB) with Cu(II), Fe(III), and Zn(II) in 1-methyl-2-pyrrolidinone (NMP) solution was monitored using electronic UV−vis−NIR, resonance Raman, and electron paramagnetic resonance (EPR) spectroscopies. The films prepared from these solutions were also spectroscopically chara…
The synthesis of silicon nanocrystals in standard radio-frequency glow discharge systems is studied with respect to two main objectives: (i) the production of devices based on quantum size effects associated with the small dimensions of silicon nanocrystals and (ii) the synthesis of polymorphous and polycrystalline si…
Due to the difficulty of H 2 storage, development of real time H 2 generators would be advantageous for portable fuel cells. In this paper, the real time production of H 2 using microdischarge devices is discussed with results from a computational investigation. Ar/NH 3 mixtures were studied using plug flow and two-di…
Abstract High molecular weight poly( L ‐lactide)s (PLLAs) and poly( D ‐lactide)s (PDLAs) were synthesized in toluene at 70 °C by ring‐opening polymerization of optically pure L ‐lactide and D ‐lactide, using tin(II) 2‐ethylhexanoate (SnOct 2 ) and 2‐(2‐methoxyethoxy)ethanol as initiator and coinitiator, respectively.…
Recombination of neutral oxygen atoms on oxidized niobium foil was studied. Three sets of samples have been prepared: a set of niobium foils with a film of polycrystalline niobium oxide with a thickness of 40 nm, another one with a film thickness of about 2 µm and a set of foils covered with dense bundles of single-cr…
We report the observation of unusual fluorescence emission from an azobenzene-containing polymer micellar solution. An amphiphilic diblock copolymer composed of the hydrophilic quaternized poly(4-vinyl pyridine) (QP4VP) and a hydrophobic liquid crystalline polymethacrylate bearing azobenzene side groups (PAzoMA) is no…
The synthesis of clathrate-II germanium □ 24 Ge 136 in an ionic liquid was recently discovered. 1 The key step in this process, the controlled oxidation of reactive precursor phases by a protic acid, was successfully applied to silicides M 4 Si 4 (M = Na, K). Through this method, clathrate-I compounds of composition M…
Suspension direct current plasma spraying allows achieving finely structured coatings whose thickness is between few tens and few hundreds of micrometres. Drops (200–300 µm in diameter) or liquid jets are mechanically injected in the plasma jet. With radial injection they are rapidly (a few µs) fragmented into droplet…
Abstract Single crystals of L‐Prolinium tartrate (C 5 H 10 NO 2 ) + (C 4 H 5 O 6 ) ‐ , a new organic non‐linear optical material of size: 15 × 10 × 10 mm 3 were grown using submerged seed solution growth method. Characterization of the crystals was made using single crystal X‐ray diffraction and density determination.…
In this paper a model of single wall carbon nanotube (SWNT) interactions with thermal plasma is developed. Several effects such as momentum, charge and energy transfer between the SWNT and plasma are considered. It is shown that the SWNT charge and potential with respect to the plasma, as well as SWNT aspect ratio, de…
Single-walled carbon nanotubes (SWNTs) with high covalent bonding density of polymer layers have been prepared by a “grafting to” approach, where the benzyl chloride groups of styrene copolymers ( M n = 47 600) reacted with the alkyne groups on SWNTs under relatively mild conditions, resulting in a higher grafting eff…
The chlorination of ferrocene at 900 °C yields very interesting carbon hollow nanospheres (CHNSs) with diameters of ∼50−150 nm and ∼12−25 nm thick walls. X-ray energy-dispersive spectroscopy shows no traces of chlorine or iron and the π*/σ* ratio of the carbon bonding was quantified by electron energy-loss spectroscop…
Carbon nanostructures have received much attention for a wide range of applications. This paper reviews the historical role of plasmas in the gas-phase synthesis of carbon nanostructures and the present plasma technologies for industrial production purposes. It enumerates the advantages and disadvantages with respect…
The effect of fractal normal-phase clusters on vortex dynamics in a percolative superconductor is considered. The superconductor contains percolative superconducting cluster carrying a transport current and clusters of a normal phase, acting as pinning centers. A prototype of such a structure is YBCO film, containing…
Atomic force microscopy (AFM) experiments and molecular dynamics (MD) simulations were conducted to examine single-asperity friction as a function of load, surface orientation, and sliding direction on individual crystalline grains of diamond in the wearless regime. Experimental and simulation conditions were designed…
The inter-Landau level transitions observed in far-infrared transmission experiments on few-layer graphene samples show a behaviour characteristic of the linear dispersion expected in graphene. This behaviour persists in relatively thick samples, and is qualitatively different from that of thin samples of bulk graphit…
The temporal evolution of step-edge fluctuations under electromigration conditions is analysed using a continuum Langevin model. If the electromigration driving force acts in the step up/down direction, and step-edge diffusion is the dominant mass-transport mechanism, we find that significant deviations from the usual…