Materials Literature
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The activity and stability of Au/TiO 2 catalysts depend on several different factors such as the anchoring strength of the Au particles at the TiO 2 surface, the particle sintering, and the surface mobility of individual gold atoms and/or gold particles. Au/TiO 2 catalysts can be made resistant to sintering by atomic…
While shape memory alloys (SMAs) have many actuation benefits, their frequencies are commonly restricted by slow cooling times caused by limitations in convective heat transfer. To increase the cooling speed and at the same time reduce excess power consumption from overheating, it is critical to understand the heat tr…
Synthesis methods used to produce poly(2-methoxyaniline-5-sulfonic acid) (PMAS), a water-soluble, self-doped conducting polymer, have been shown to form two distinctly different polymer fractions with molecular weights of approximately 2 kDa and 8-10 kDa. The low molecular weight (LMWT) PMAS fraction is redox inactive…
The synthesis and characterization of a Keggin-type mono-rhenium(V)-substituted polyoxotungstate are described. The dimethylammonium salt [Me2NH2]4[PW11ReVO40] was obtained as analytically pure homogeneous black-purple crystals by reacting mono-lacunary Keggin polyoxotungstate with [ReIVCl6]2- in water, followed by cr…
Crystals of La(2)Pb(SiS(4))(2), dilanthanum(III) lead(II) bis[tetrasulfidosilicate(IV)], were obtained from the La-Pb-Si-S system and structurally characterized using X-ray single-crystal diffraction. The La and Pb atoms are coordinated in bicapped trigonal prisms of S atoms, with the Si atoms in tetrahedra. An occupa…
We report on measurements and calculations of the ultrafast exciton relaxation dynamics in ZnO. Time-resolved differential reflectivity measurements of bulk ZnO were performed as a function of excitation wavelength. Bi-exponential decays of the A and B exciton states are observed with a fast (~2-5 ps scale) and a slow…
The preparation and characterization of conducting polycarbazole (PCz) hybrid films with a colorless transparency are described. They were prepared by the vacuum evaporation of tin, aluminum, or gallium onto anion-doped green-colored PCz films, or by applying gallium to the films, followed by their exposure to ambient…
The changes in crystal growth habit of electrodeposited zinc oxide with zinc nitrate concentration are explained by changes in the levels of saturation at the electrode. Three growth regimes are found between 0.5 and 50 mM. For concentrations less than 2 mM, the growth is one-dimensional. Nanorods grow by screw disloc…
Abstract Organically modified sol‐gel coatings have been investigated as potential replacements for chromate conversion treatments of an AA1050 aluminium alloy. The coatings were prepared by combination of a completely hydrolysable precursor of tetra‐ n ‐propoxyzirconium (TPOZ), with a partially hydrolysable precursor…
Abstract Multi‐walled boron nitride nanotubes were irradiated with low and medium energy argon and helium ions at room and elevated temperatures. The irradiated samples were characterized by transmission electron microscopy and Raman spectroscopy, and a comparison to the response of carbon nanotubes to irradiation was…
We present a first-principles systematic study of the electronic structure of ${\text{SiO}}_{2}$ including the crystalline polymorphs $\ensuremath{\alpha}$ quartz and $\ensuremath{\beta}$ cristobalite, and different types of disorder leading to the amorphous phase. We start from calculations within density functional…
The synthesized Nd fluoride nanocrystals exhibited different upconversion behaviors as dispersed and aggregated samples due to the different energy transfer mechanisms. When they were dispersed in water, the NaNdF(4) nanocrystals exhibited approximately 400 times stronger upconversion fluorescence than the NdF(3) nano…
The title compound, dibarium digadolinium(III) tetrasilicate, crystallized from a molybdate-based flux. It represents a new structure type and contains finite zigzag-shaped C(2)-symmetric Si(4)O(13) chains and Gd(2)O(12) dimers built of edge-sharing GdO(7) polyhedra. The [9+1]-coordinated Ba atoms are located in voids…
Atomistic computer simulation techniques based on energy minimization procedures are utilized for the structural investigation of perovskite-type SmCoO(3). A reliable potential model is derived which reproduces both cubic as well as orthorhombic phases of SmCoO(3). We observe a negative chemical pressure induced struc…
Abstract Two Cu II complexes with the new zwitterionic ligand 1‐carboxymethylpyridinio‐3‐benzoate ( L ), [Cu 4 L 4 (OH) 2 ](ClO 4 ) 2 · 8H 2 O ( 1 ) and [Cu 4 L 4 (OH) 2 ]Cl 2 · 8H 2 O ( 2 ), have been synthesized and characterized crystallographically and magnetically. The two compounds contain isostructural chains,…
The aerobic reaction of the Schiff-base ligand N-(benzimidazol-2-yl)salicylaldimine (Hbisi) with iron(II) perchlorate in methanol leads to the formation of the remarkable coordination compound [Fe(4)(mu(4)-O)(mu-MeO)(4)(bisi)(4)](ClO(4))(2) x 4 MeOH (1), whose single-crystal X-ray structure reveals the presence of a d…
Electrospinning was used for the first time to prepare nanofibers of the host/guest complex between poly(ethylene oxide) (PEO) and thiourea. It is shown by differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) that the stoichiometry of the complex is (EO)(12)-(thiourea)(8), settling a series…
Orthorhombic tadpole-shaped AgInSe 2 nanocrystals have been synthesized from the single molecular precursor [(PPh 3 ) 2 AgIn(SeC{O}Ph) 4 ]. Reaction parameters such as temperature, surfactant concentration, and heating duration have been optimized to get monodispersed AgInSe 2 nanotadpoles. Severe stacking faults were…
CO oxidation is a very useful reference reaction in catalysis by nanoparticles (NPs). Two reaction models—an association mechanism (AM) and a carbonate-mediated mechanism (CMM)—have been suggested for CO oxidation catalyzed by small NPs. It is still unclear, however, when and why these mechanisms preferentially operat…
In this paper, the main parameters, which dictate the supracrystalline structure of silver nanocrystals self-assembled at the micrometer scale, are evidenced. They are the alkyl-chain length, the deposition temperature, the concentration of the colloidal solution and the nature of the substrate. By varying the deposit…