Materials Literature
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We report significant deviations from the usual quadratic dependence of the ground state interband transition energy on applied electric fields in InAs/GaAs self-assembled quantum dots. In particular, we show that conventional second-order perturbation theory fails to correctly describe the Stark shift for electric fi…
A recently developed model that unifies the ballistic and diffusive transport mechanisms is applied in a theoretical study of carrier transport across potential barriers at grain boundaries in microcrystalline semiconducting materials. In the unified model, the conductance depends on the detailed structure of the band…
The effects of periodic and aperiodic distortions on the structure factor and radial distribution function of single-component lattices are investigated. To this end, different kinds of distortions are applied to the otherwise perfect square lattice and the corresponding radial distribution function and structure fact…
Ultrahigh resolution synchrotron diffraction data for ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ throw new light on the metal-insulator transition of ${\mathrm{Co}}^{3+}$ Ba-cobaltites. An anomalous expansion of ${\mathrm{CoO}}_{6}$ octahedra is observed at the phase transition on heating, while ${\mathrm{CoO}}_{5}$ py…
We study the new water model proposed by Mahoney and Jorgensen [J. Chem. Phys. 112, 8910 (2000)], which is closer to real water than previously proposed classical pairwise additive potentials. We simulate the model in a wide range of deeply supercooled states and find (i) the existence of a nonmonotonic "nose-shaped"…
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Various modes are being explored for the construction of functional materials out of nanoparticles. Despite these efforts, the assembly of nanoparticles remains challenging with respect to the requirement of multiple component organization on varying dimensions and length scales. We report here a room-temperature, wet…
In previous papers [Harding (2001), Acta Cryst. D57, 401-411, and references therein] the geometry of metal-ligand interactions was examined for six metals (Ca, Mg, Mn, Fe, Cu, Zn) using the Protein Data Bank and compared with information from accurately determined structures of relevant small-molecule crystals in the…
To start, a brief introduction is provided on the importance of transition-metal nanoclusters, on the need to develop and then apply methods to rank the nanocluster formation and then stabilizing abilities of commonly employed anions, solvents, cations, and polymers, and on the somewhat confused literature of nanoclus…
Surface-enhanced Raman scattering (SERS) is a spectroscopic technique which combines modern laser spectroscopy with the exciting optical properties of metallic nanostructures, resulting in strongly increased Raman signals when molecules are attached to nanometre-sized gold and silver structures. The effect provides th…
Abstract New optically active poly(ester‐imide)s containing benzophenone tetracarboxylic and L ‐phenylalanine moieties were synthesized from N,N ′(4,4′‐carbonyldiphthaloyl)‐Bis‐ L ‐phenylalanine diacid chloride (1) with several aromatic diols such as phenolphthalein (2a), hydroquinone (2b), 2,4‐dihydroxyacetophenone (…
Multiwalled carbon nanotubes are synthesized using Co-beta for the first time using the catalytic chemical vapour deposition method. The effects of reaction temperature, reaction time, and flow rate of acetylene on the growth of multiwalled carbon nanotubes are studied. From the TEM results it is established that the…
Solubility measurements of glucose in a variety of binary, ternary, and multicomponent mixtures containing 2-methyl-2-butanol, dimethyl sulfoxide, acids, esters, and water at different temperatures are presented. The solubilities of crystalline β-glucose, amorphous β-glucose, and amorphous β-glucose in 2-methyl-2-buta…
Abstract This work presents the synthesis by plasma and the characterization of polypyrrole–polyaniline–iodine copolymer thin films. The objective was to study the conditions to randomly copolymerize different and noncombinable monomers to create new copolymers with enhanced selective properties. The study was focused…
Abstract The tensile strength of some polyolefin blends, HDPE/PP, HDPE/LDPE, HDPE/ LLDPE, and PP/LLDPE, achieved by dynamic packing injection molding have been investigated as a function of composition and melt temperature. Molecular architecture and phase behavior play an important role in chain orientation, hence th…
Two Y2O3–SiO2 nanocomposites with 10 and 30 wt.% yttrium oxide were obtained by a sol–gel method, and characterized by TEM, X-ray diffraction, FTIR, 29Si MAS and CPMAS NMR spectroscopy. It was found that small (2–3 nm) amorphous yttria nanoparticles are homogeneously dispersed in the silica matrix. Their size does not…
The objective of this study was to adjust work function of polyaniline (PANI) in the solid state by precisely dosed UV irradiation. For this purpose triphenylsulfonium triflate salt was used as a photo acid generator. The structure of PANI before and after irradiation was characterized by UV−vis and FTIR spectroscopy.…
Abstract The crystallization and melting behavior are closely related not only to the external conditions such as undercooling and cooling rate, but also to the chain structure characteristics such as isotacticity distribution. The isotacticity distribution of three commercial isotactic polypropylenes (iPP) used in th…
Abstract Hydrated silicas impart better physical properties to polar rubbers, compared to those of hydrocarbon rubbers. However, to achieve optimum properties silane coupling agents are crucial in such formulations. Epoxidized natural rubber (ENR) in small proportions is used as a reinforcement modifier for silica‐fil…
We describe the luminescence spectral properties of CdS nanoparticles with multiphoton excitation. Three types of CdS nanoparticles were examined which were a CdS/dendrimer composite which displays high anisotropy, Cd 2+ -enriched nanoparticles which display two emission maxima, and polyphosphate-stabilized nanopartic…