Materials Literature
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Oxygen-doped diamond films are prepared by implanting various dose oxygen ions into the diamond films synthesized by hot filament chemical vapour deposition, and their electrical and structural properties are investigated. Hall effect measurements show that lower dose oxygen ion implantation is beneficial to preparing…
Organic electronics technology, in which at least the semiconducting component of the integrated circuit is an organic material, offers the potential for fabrication of electronic products by low-cost printing technologies, such as ink jet, gravure offset lithography and flexography. The products will typically be of…
Closed cell ferrous foams were fabricated using a chemically bonded oxide ceramic foam precursor. The major constituent of the ceramic foam precursor was iron oxide (Fe 2 O 3 ), which was mixed with various foaming/setting additives. The density of the foam was modified by varying the ambient pressure under which foam…
Nanostructured particles like nanorice and nanospears (i.e., tapered nanorods, see figure) are produced using polymer nanospheres and ordered porous templates. The ordered cylindrical nanopores of anodized alumina membranes are filled with spherical polymer nanoparticles by solvent-assisted nanoinjection. Then, the me…
We report the synthesis of novel polysilsesquioxane hybrid crystals prepared from two precursors with hexylene- and octylene-bridged groups. Both crystals are composed of bimolecular rings (18- and 22-membered, respectively) formed by one-step condensation of two hydrolyzed monomers. The hydrogen bonds between silanol…
Abstract Chemical resistance of natural fiber (wood flour, rice hulls, kenaf fiber, and newsprint) polypropylene composites was studied in terms of their weight loss and reduction of mechanical properties after 7 days immersion in chemical reagents. Composites containing 25 and 50% of various natural fibers and polypr…
Generalized two-dimensional (2D) correlation spectroscopy was used to characterize the structural evolution of silk fibroin as the pH changed from 6.8 to 4.8, demonstrating that the conformational transitions of silk fibroin are induced step by step as the pH decreases. 2D homo- and hetero-spectral correlation spectro…
Abstract The syntheses of seven new tetrathiafulvalene (TTF) derivatives substituted by two pyridine groups and their characterization by the usual methods are described. Cyclic voltammetry of all the compounds showed two one‐electron reversible waves with redox potentials comparable to other pyridine‐substituted TTF…
Mono- and polyamines can catalyze the hydrolysis and condensation of organosilicate starting materials in biomimetic silica synthesis pathways at circum-neutral pHs and room temperature. Our study is focused on understanding the mechanistic role of amines in catalyzing the hydrolysis process that precedes condensation…
ZnO nanoparticles were synthesized by a simple mild solution method. Spectral sensitization of nanocrystalline ZnO was carried out with [Ru(dcbpy)(2)(NCS)(2) (dcbyp = 2,2'-bipyridyl-4,4'-dicarboxylate)] (RuN3) and CuPc. The electron transfer behaviours at the surface and interface in ZnO/RuN3 and ZnO/CuPc were investi…
Thermal desorption spectroscopy is employed to examine transport mechanisms in structured, nanoscale films consisting of labeled amorphous solid water (ASW, H(2)(18)O, H(2)(16)O) and organic spacer layers (CCl(4), CHCl(3)) prior to ASW crystallization (T approximately 150-160 K). Self-transport is studied as a functio…
Two unsymmetrical ditopic hexadentate ligands designed for the simultaneous recognition of two different trivalent lanthanide ions have been synthesized, L(AB2) and L(AB3), where A represents a tridentate benzimidazole-pyridine-benzimidazole coordination unit, B2 a diethylamine-substituted benzimidazole-pyridine-carbo…
Ultrahigh molecular weight polyethylene (UHMWPE) and ethylene−methyl methacrylate copolymer (EMMA) composites containing multiwall carbon nanotubes (MWNTs) were prepared by the gelation/crystallization method. The conductivity and Young's modulus were obtained as a function of EMMA content. When 5 wt % MWNT was admixe…
We report Brillouin spectroscopy experiments conducted on ethanol in the liquid and glass states, as well as in the stable crystal, plastic crystal and orientationally-disordered crystal (“glassy crystal”) phases. Both the canonical supercooled liquid ↔ glass transition and the dynamical plastic crystal ↔ glassy cryst…
Uronates are important constituents of maize mucilage and polyuronates are used as a simplified model of the soil–root interface. We tested whether galacturonate (GA) and polygalacturonate (PGA) impair the diffusion of phosphate (PO 4 ) into and out of pores of a synthetic goethite (147 m 2 g −1 ) and whether the effe…
We theoretically perform a comparative analysis of the adsorption of polymers onto the regularly and randomly nonuniform surfaces. By developing and making use of the self-consistent perturbation expansion we calculate the surface excesses of the polymers adsorbed on the random and periodically patterned surfaces. In…
The solubility of carbon dioxide in polycaprolactone (CAPA 6800) was measured at (313 and 333) K between pressures of (80 and 200) bar. Data were obtained using a static method that allowed saturation of the polymer with CO 2 under the experimental conditions.
The synthesis of porous inorganic films and materials by templating organized organic matter with nanosized structural elements is an actual field in the cross-section of inorganic chemistry, materials chemistry and surfactant science. This discussion article will review recent experiments in this area on a variety of…
Ni adsorption on Stone-Wales defect sites in (10,0) zigzag and (5,5) armchair single-wall carbon nanotubes was studied using the density functional theory. The stable adsorption sites and their binding energies on different Stone-Wales defect types were analyzed and compared to those on perfect side walls. It was dete…
Summary Sorption of the anionic form of the pesticide 2,4–D (2,4–dichlorophenoxyacetic acid) on the surface of the clay mineral montmorillonite was investigated using a short‐time ab initio molecular dynamics (MD) simulation at room temperature. Three different situations were modelled: sorption on a dry surface, on a…