Materials Literature
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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…
Rapid formation of active, mesoporous, and crystalline TiO 2 photocatalysts via a novel microwave hydrothermal process is presented. Crystalline anatase mesoporous nanopowders 100–300 nm in size with worm hole‐like pore sizes of 3–5 nm were prepared by a modified sol–gel of titanium tetra‐isopropoxide, accelerated by…
A flexible nano-photo-electrochromic poly(ethylene terephthalate) (PET)−TiO 2 −PO 4 −methylene blue (MB) based film was obtained by the deposition of TiO 2 nanoparticles on a PET conductive substrate. A further covalent chemical bond of MB molecules on the TiO 2 film by means of phosphate groups ensures the photo-elec…
The master sintering curve approach represents densification data in terms of a master variable that combines sintering time and temperature. Recently, a finite‐element scheme to predict sintering deformation that requires only the master sintering curve instead of a full constitutive law as the input data has been de…
We predict the photoswitching magnetic properties of four substituted dihydropyrenes from density functional broken-symmetry calculations. The magnetic exchange coupling constants differ up to 9.44 cm(-1). The intramolecular exchange interactions are ferromagnetic in nature. The calculated coupling constants are much…
Solid-state synthesis of boron subnitride, B 6 N, as a result of chemical interaction between boron and boron nitride at 7.5 GPa and 1700 °C has been previously reported by Hubert et al. However, a critical analysis of the results has shown that the evidence for the formation of boron subnitride with B 6 O-like struct…
This paper deals with the physical and the chemical gelation of gelatin in the presence of a reactant, bisvinyl sulfonemethyl (BVSM). The strategy of this investigation is to separate the contributions of the two types of cross-links in order to deduce the resultant elasticity of the network. In addition, the question…
To stabilize platinum clusters on carbon supports, carbon substituted boron dopants were introduced in graphite and fullerene models, and the binding energies of Pt(1) to Pt(6) clusters on the carbon supports were investigated using first-principles density functional theory (DFT) calculations. The adsorption energies…