Materials Literature
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We present the microfabrication of silicon nitride membrane supports ('windows') for transmission electron microscopy (TEM) and illustrate their usefulness for direct preparation and studies of nanostructures. These membrane 'windows' enable TEM to be incorporated as an affordable diagnostic tool in nanostructure fabr…
The need for an a priori domain size distribution is one of the main limitations of existing line profile analysis methodologies. A numerical modification of the whole-powder-pattern modelling algorithm is proposed, to allow the refinement of a general domain size distribution from powder diffraction data. The shape o…
The crystallization of the PLLA block within the microphase-separated lamellar microdomain in a poly(styrene)- b -poly( l -lactide) (PS-PLLA) diblock copolymer was carried out from hard confinement (i.e., the crystallization temperature of PLLA ( T c,PLLA ) < the glass transition temperature of PS ( T g,PS )) to soft…
White light emission was obtained from a light-emitting diode prepared from polymer/quantum dot nanocomposites consisting of poly(9,-dihexylfluorene-2,7-divinylene- m-phenylenevinylene-stat-p-phenylenevinylene) (PDHFPPV) and two kinds of CdSe nanoparticles with different particle size. Blue emission from the polymer,…
We review recent experiments on optical detection and manipulation of spin states of impurity centres in a solid. This research topic is of particular interest because of possible applications of the single-spin read-out technique in solid state quantum computing. The experimental background of optical detection of si…
Different nanotubes were prepared from two triblock copolymers. Chemistry was performed on the nanotubes so that one type contained amino terminal groups and the other bore carboxyl terminal groups. The amino and carboxyl groups were reacted by amidization to join the nanotubes head to tail to yield nanotube multibloc…
Certain polyoxometalate anions strongly chemisorb on the surface of carbon black aggregates. Together with an ultrasound treatment, this adsorption constitutes the driving force for the splitting of initially big carbon particles into smaller units. The negative charge generated at the particle surface favors the form…
The following report considers textured materials of the DyBa2Cu3O7 type seeded with a Nd123 seed as initiator. They are grown with an excess 20% Dy211 phase on a Dy2O3 substrate. We report chemical characterizations, electrical resistivity, thermoelectric power and thermal conductivity over a broad temperature range…
Cross-linked poly(dimethylsiloxane) (PDMS) was irradiated with a Xe 2 *-excimer lamp (172 nm) under ambient conditions. The irradiation in combination with the formed ozone results in an oxidation of PDMS to SiO 2 at the polymer−air interface. The surface properties of the irradiated surfaces were studied by means of…
We consider the superstructures, which can be formed in spinels containing on B-sites the transition-metal ions with partially filled t2g levels. We show that, when such systems are close to itinerant state (e.g. have an insulator-metal transition), there may appear in them an orbitally-driven Peierls state. We explai…
In the preparation of high-quality polymeric carbon nanocomposites, the full compatibility of carbon nanotubes as the filler with the matrix polymer is required. For such a purpose, an amino-terminated polyimide, specifically designed to be structurally identical to the matrix polymer, was synthesized and used in the…
Radiation damage restricts the useful lifetime for macromolecular crystals in the X-ray beam, even at cryotemperatures. With the development of structural genomics pipelines, it will be essential to incorporate projected crystal lifetime information into the automated data collection software routines. As a first step…
. This study is devoted in the search of a model describing the best possible liquid and solid phases of the systems Cd-Te, Hg-Te, and Cd-Hg-Te. For the liquid phases, we used the model of Sub-regular Associated Solution (S.A.S). Thermodynamic quantities of dissociation, for the associated species are calculated by th…
Spherical PbSe semiconductor nanocrystals with near-infrared absorption of 1100−2520 nm (corresponding to diameters of 3−13 nm) were synthesized in a noncoordinating solvent (1-octadecene). The as-prepared PbSe semiconductor nanocrystals have very narrow size distributions (σ ≅ 5−7%) without any postsynthetic size sel…
Abstract Grafting of maleic acid (MAc) on low density polyethylene (LDPE) was carried out using γ‐irradiation technique. Preactivation method was used for grafting and a maximum grafting of 2.4% was obtained. Grafted polymer(LDPE‐g‐MAc) was characterized by chemical method, Fourier Transform Infrared Spectroscopy (FTI…
By means of laser light scattering, poly(vinylidene fluoride) (PVDF) chains were found to form complex aggregates of very narrow size distribution even at dilute concentrations of good solvents such as propylene carbonate (PC) and γ-butyrolactone (BL). Almost the same radii of gyration for aggregates in both solvents…
Abstract Water blown rigid polyurethane foams are made using dibutyltin dilaurate and triethanol amine as catalysts. The rate of carbon dioxide generation due to the reaction of isocyanate with water and the rate of polymerization are varied by changing the relative proportion of the catalysts keeping the total cataly…
Abstract Hydraulic resistance of rigid polyurethane foams to penetration by water at high pressures is studied in this work in the context of buoyancy applications. Micron sized silica particles are used as nucleating agents. The effect of the variation of the concentrations of the surfactant, water, and nucleating ag…
Abstract Crystallization kinetics of MC nylon (PA6) and polyazomethine (PAM)/MC nylon (PAM/PA6) both have been isothermally and nonisothermally investigated by different scanning calorimetry (DSC). Two stages of crystallization are observed, including primary crystallization and secondary crystallization. The Avrami e…
Abstract Thin plaques (1, 2, and 3 mm) made of polypropylene homopolymer (iPP) and three ethylene propylene block copolymers (EPBC) with different ethylene content (5.5, 7.4, and 12% in weight) have been obtained by different processing methods (injection molding, injection and annealing, and compression molding). The…