Materials Literature
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The study was conducted to evaluate different forms of K, and release and fixation characteristics of 12 representative calcareous Vertisols of southern Iran. Mineralogical analysis indicated that smectite was the main clay mineral in the Vertisols, but some Vertisols had chlorite, illite, and palygorskite, as well as…
In the present paper we intend to explain the discrepancies between theoretical and experimental values of mechanical properties for carbon nanotubes. In the numerical analysis pristine and defective carbon nanotubes are taken into account in order to find how the presence of defects affects on the mechanical properti…
A novel polymeric surfactant composed of a hydrophobic perylene dye covalently linked to hydrophilic poly(vinyl alcohol) (PVA) chains was employed to prepare stable aqueous dispersions of graphene. The presence of well-dispersed few layer graphene was demonstrated by UV-visible, Raman and fluorescence spectroscopy. Th…
Commercially available barium ferrite BaFe12O19 (BaFeO) nanoparticles with a size of ∼100 nm have been successfully encapsulated inside the hollow periodic mesoporous organosilica (HPMO) host material, through a 2-step (coating and encapsulation) approach. The resultant magnetic HPMO (MHPMO) nanoparticles possess a re…
The charge mobility is a key property in many electro-optical materials, with charge transfer (CT) taking place in a solid matrix of molecules. Large intermolecular electronic interaction is one of the key factors for a good CT rate, which is dependent on both intra- and intermolecular structures. The connection of th…
A novel red phosphor, SrIn 2 O 4 :Eu 3+ , Sm 3+ , is synthesized by a combustion method. The 5 D 0 → 7 F 2 transition of Eu 3+ is dominantly observed in the photoluminescence spectrum, leading to a red emission of the phosphor. The doped Sm 3+ is found to be efficient to sensitize the emission of Eu 3+ and be effectiv…
Filamentous polyelectrolytes in aqueous solution aggregate into bundles by interactions with multivalent counterions. These effects are well documented by experiment and theory. Theories also predict a gel phase in isotropic rodlike polyelectrolyte solutions caused by multivalent counterion concentrations much lower t…
Fast response time UV photoconductive detector was fabricated based on ZnO film prepared by thermal chemical spray pyrolysis technique. The ZnO nanofilms are grown on the porous silicon (PS) nanosurface which has drastically reduced the response time of the ZnO UV detector from few seconds to few hundreds of microseco…
Highly water-dispersible polymer acid-doped polyanilines have been synthesized and evaluated as an alternative for expensive Nafion ionomers in the anode of direct methanol fuel cells (DMFC). These polymers as ionomers lead to higher performance in single cell DMFC compared to Nafion ionomers due to mixed ionic-electr…
Carboxylic acids produced by acid fermentation have attracted much attention recently as promising chemical feedstock. The feasibility of the acid fermentation as a high-value added bioconversion process depends on the selective separation of carboxylic acids from the bulk solution. The authors synthesized an aminopro…
All-Silicon tandem solar cells make use of the quantum confinement of silicon nanocrystals (Si-NCs) embedded in silicon oxide, carbide or nitride for the band gap engineering required to achieve efficiencies beyond the Shockley-Queisser-Limit while relying exclusively on abundant and non-toxic materials. A promising a…
Dendron–dipeptide conjugates were synthesized to investigate their self-assembly characteristics not only in the aqueous phase but also in organic media. In the aqueous phase, the self-organized structure of 2G-PhePhe and 2G-GlyGly was influenced predominantly by the self-assembly characteristics of the amide dendron…
The excited state characteristics of phenylene (Ph)-bridged periodic mesoporous organosilica (PMO) powders with crystal-like and amorphous wall structures are investigated. Crystal-like Ph-PMO has a molecular ordering of the bridging organic moieties with intervals of 0.76 and 0.44 nm parallel and perpendicular to the…
We report a facile approach to fabricate highly ordered zirconia nanowire arrays with controllable dimensions of φ25–40 nm in diameter, 100–550 nm in length, and 3–20 in aspect ratio by a tailored two-step anodization from superimposed Al/Zr layers sputter-deposited on glass substrates. A porous-type Al anodization in…
Complex MnO2 nanostructures were prepared through controlled precursor adsorption. The preferential adsorption of a precursor ion leads to the anisotropic growth of crystals, and even produces crystals of different crystal structures. The thus produced primary anisotropic crystals assemble into porous spherical hierar…
Cerium oxide is a widely used catalyst support due to favorable oxygen storage and release properties. The present investigation was undertaken to improve the thermal stability of hollow ceria shells by incorporation of zirconium. Hollow ceria spheres were doped with zirconium in the range of 1–13 atomic percent by a…
Addition or doping of anion-sensitive self-assembled gels formed from tetrahexyl pyromellitamide 1 in cyclohexane with a few equivalents of europium(III) triflates results in materials with red luminescence arising from the europium(III) ions. Gelation and spectroscopic studies suggest that the europium(III) ions bind…
The purpose of the present study was to reveal the details of the preparation of CaF2 particles with controllable size (30–900 nm) and shape (spherical, hexagonal, and cubical forms) using a liquid-phase synthesis method, and to demonstrate that a change in the composition of the reactants and crystalline structure of…
Structural changes of photochromic pyrazolones were first verified by an X-ray crystallographic method directly. A tautomeric transformation between enol and keto form isomers occurs, accompanied by proton transfer during the photochromic processes.
Reduced graphite oxide (rGO)-indium tin oxide (ITO) hybrid materials suitable for spin-coating transparent electrodes were synthesized and evaluated. GO was made using a modified Hummers method and was reduced by p -phenylene diamine (PPD-rGO) or hydrazine hydrate (HYD-rGO). Raman spectra showed that the G-band of PPD…