Materials Literature
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A simple and low-cost method based on a two-step heat treatment of AgNO(3)/SiO(2) film has been developed for fabricating metal Ag nanoring arrays. The as-prepared nanorings have an inner diameter of 70-250 nm and an average wall thickness (namely wire diameter) of approximately 30 nm with a number density of approxim…
Abstract Arabinoxylans from corn cob and oat spelt were studied in sorption experiments onto bleached and unbleached softwood kraft pulp. The corn cob (CC) xylans were produced by steam extraction (SE-CC) and alkaline extraction (NaOH-CC), while the oat spelt xylan (NaOH-OS) was obtained by alkaline extraction. Both a…
A procedure to compute intensity distributions generated by the Mie scattering from a single coated sphere is described, and applied to a nanoshell and a microshell. The obtained information on the near-field intensity and the absorbed energy density is shown to be useful in predicting optical properties of the core-s…
Understanding interactions between colloids (or nanoparticles) immersed in a phase-separating binary mixture is of both fundamental and technological importance. Here we report a novel type of interparticle attractive interaction of a purely dynamic origin, which is found by a coarse-grained numerical simulation. Due…
Abstract The flame‐retardant and smoke‐suppressant properties of inorganic tin compounds such as zinc hydroxystannate (ZHS) and zinc stannate (ZS) were studied in comparison with those of alumina trihydrate and magnesium hydroxide through the limiting oxygen index test and a smoke density test. The thermal degradation…
Plastics used in the packaging industry, especially in the form of carry bags and pouches, manifest a formidable threat to the environment because of their non-biodegradable nature. Addition of both natural and synthetic fibers to these materials improves their performance, replacing the conventional materials like wo…
A novel polychromic phosphor with core-shell heteronanostructure has been prepared to improve the chromatic index of phosphors. As for the first example, Y(2)O(3):Eu(3+)@SiO(2)@YVO(4):Eu(3+), its synthetic route, structure and optical properties are presented in this paper. X-ray diffraction (XRD), field emission scan…
Funktionalisierte Goldnanopartikel mit komplementären H-Brücken bildenden Gruppen können die Sekundärstruktur von Xerogelfasern steuern, die durch einen molekularen Leiter gebildet werden. Möglich wird dies durch ihren Einbau in die Nanodrähte, die, sobald sie dotiert sind, eine metallartige Leitfähigkeit aufweisen, o…
Ein supramolekularer Ansatz überführt Nanopartikel in sphärische Kolloidpartikel mit kristalliner Überstruktur (siehe Bild). Mechanistischen Studien zufolge entstehen diese Partikel in zwei Stufen. Die Triebkraft für die Bildung der „Überpartikel“ ist eine solvophobe Wechselwirkung zwischen den Bausteinen der Nanopart…
Nonstoichiometric synthesis of poly(4,4‘-oxydiphenylene pyromelliteimide) was examined by using reaction-induced crystallization of oligomers during solution polymerization. Polymerizations of pyromellitic dianhydride (PMDA) and 4,4‘-oxydianiline (ODA) were carried out in Barrel Therm 400 at 330 °C at various molar ra…
A single-step synthesis route is described for the preparation of a metal-polymer composite in which palladium acetate and meta-amino benzoic acid were used as the precursors for palladium nanoparticles and poly(meta-amino benzoic acid) (PABA). The palladium nanoparticles were found to be uniformly dispersed and highl…
We synthesized novel fluorescent magnetic silica nanoparticles (FMSNPs) containing large magnetic components for biomedical application. By employing assemblies of magnetic nanoparticles as kernels against FMSNPs, both the saturation of magnetization and the magnetic resonance (MR) signal intensity were significantly…
We investigate the electronic properties of individual C(60) nanowhiskers by exploiting conductive atomic force microscopy at room temperature in ambient atmosphere. The pristine individual C(60) nanowhiskers exhibit conducting behavior. The outer C(60) oxide covering, confirmed by Auger electron spectroscopy, shelter…
The effect of Nd and Co substitution on magnetic entropy changes and hysteresis losses has been investigated for the cubic NaZn13-type LaFe13−xSix compounds. Partially replacing La with Nd leads to a decrease of the Curie temperature TC and an increase of the magnetic entropy change ΔS. Substitution of Co for Fe in La…
The electronic and geometrical structures of Al7N- are investigated using photoelectron spectroscopy and ab initio calculations. Photoelectron spectra of Al7N- have been obtained at three photon energies with six resolved spectral features at 193 nm. The spectral features of Al7N- are relatively broad, in particular f…
Attaching electron-rich 1,3-dithiol-2-ylidene moieties to polynitrofluorene electron acceptors leads to the formation of highly conjugated compounds 6 to 11, which combine high electron affinity with a pronounced intramolecular charge transfer (ICT) that is manifested as an intense absorption band in their visible spe…
Liquid crystals are intriguing electrically responsive soft matter systems. We report previously unexplored field-induced changes in the structures of some frustrated liquid crystal phases and describe them theoretically. Specifically, we have discovered using resonant x-ray scattering that the four-layer intermediate…
The specific heat of La0.4Ca0.6MnO3 in bulk and nanoparticle (∼60nm in grain size) forms was investigated. It is found that the charge-ordered state highly stabilized in the bulk samples can be significantly suppressed in the nanoparticle. The low temperature specific heat data reveal a Schottky-like anomaly at ∼5K fo…
A facile, solvent-free, low-level noncovalent method for the modification of single-wall carbon nanotubes (SWNTs) by tertiary phosphines is described. The modified SWNTs show greater ease of exfoliation into common organic solvents (such as dichloromethane, dimethylformamide, ethanol, and 1,2-dichlorobenzene) than unm…
Zinc oxide under biaxial inplane tensile strains is studied theoretically by first-principles density functional calculations. Different material properties (including structural response of cell shape, chemical bonding, total-energy curvature, electrical polarization, Born effective charge, electronic band dispersion…