Materials Literature
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The Czochralski method was used to grow a 46-mm-long crystal of the Ba8Ga16Ge30 clathrate, which was cut into disks that were evaluated for thermoelectric performance. The Seebeck coefficient and electrical and thermal conductivities all showed evidence of a transition from extrinsic to intrinsic behavior in the range…
Crystals of the novel title arsenic(III)-phthalocyanine complex, [As(C32H16N8)]2[As2I8] or [AsPc]2[As2I8], where Pc is the phthalocyaninate(2-) macrocycle, have been obtained from the reaction of pure powdered arsenic with phthalonitrile under oxidizing conditions (iodine vapour) at 463 K. The crystals are formed by s…
Abstract Helical mesoporous silica nanorods have been synthesized with high efficiency by the addition of 1-alkanol or 1-aminoalkane with proper carbon chain length (C4–C8) as a cosurfactant of cetyltrimethylammonium bromide (CTAB) during the synthesis of MCM-41 in a dilute synthesis gel containing CTAB, tetraethyl or…
A balanced A−C diblock copolymer surfactant was used to organize mixtures of immiscible A and B homopolymers. The C block of the copolymer exhibits repulsive and attractive interactions with the A and B homopolymers, respectively, leading to rich phase behavior. Experimental results indicate the existence of a microph…
Carbide-derived carbon (CDC) nanowires (NWs) have been synthesized by the high-temperature treatment of small-diameter β-SiC whiskers with Cl 2 /H 2 . A variety of physical measurements indicate that Si was extracted by exposure to Cl 2 and that the C in the carbon nanowires is primarily sp 2 -bonded. From BET measure…
Abstract The hybrid hydrogel composed of tubular aluminosilicate nanofiber, “imogolite,” and pepsin was prepared in a simple manner. We confirmed the formation of a network structure of imogolite in hydrogel by FE-SEM observations. Pepsin immobilized onto imogolite showed enzymatic activity after repeated reactions.
In this paper, the large amplitude free vibration of a doubly clamped microbeam is considered. The effects of shear deformation and rotary inertia on the large amplitude vibration of the microbeam are investigated. To this end, first Hamilton’s principle is used in deriving the partial differential equation of the mic…
A novel multi-branching carbon nanotube (CNT) structure is synthesized by direct current plasma enhanced chemical vapor deposition. The structure consists of aligned CNTs which have branches of smaller diameters growing aligned along a direction perpendicular to the original CNT. The mechanism of branching is explaine…
This study is focused on the electrochemical performance of perovskite-type materials based on doped LaGaO 3 (LGO). La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 - δ (LSGM) and La 0.9 Sr 0.1 Ga 0.8 Mg 0.115 Co 0.085 O 3 - δ (LSGMCo) were used as electrolytes and La 0.8 Sr 0.2 MnO 3 - δ (LSM) and La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3 -…
Colloidal particles were derivatized with end-grafted polymethylmethacrylate polymer brushes containing varying concentrations of spirobenzopyran photochromic molecules. The polymers were grown from initiator-functionalized silica particles by an atom-transfer radical polymerization (ATRP). These core-shell colloids f…
The thermodynamic model of a 2D solution developed earlier for protein monolayers at liquid interfaces is generalized for monolayers composed of micro- and nanoparticles. Surface pressure isotherms of particle monolayers published in the literature for a wide range of particles sizes (between 75 microm and 7.5 nm) are…
In this work, we probed the effects of shear flow on the alignment of dispersed single-walled carbon nanotubes in polymer solutions. Two different systems were compared: Single-walled carbon nanotubes dispersed using an anionic surfactant and single-walled carbon nanotubes dispersed using an anionic surfactant and a w…
A novel energy-transfer system involving nonaggregated cationic porphyrins adsorbed on an anionic-type clay surface and the electron-transfer reaction that occurs after light harvesting are described. In the clay-porphyrin complexes, photochemical energy transfer from excited singlet zinc porphyrins to free-base porph…
The localized surface plasmon resonance (SPR) spectrum of silver nanoparticles fabricated on a thermochromatic film, vanadium dioxide (VO2), is studied in this paper. Owing to the temperature-dependent dielectric function of VO2, the SPR band dramatically exhibits temperature dependence in the range of 30-80 degrees C…
The permeability of lipid and protein microcapsules fabricated by alternating adsorption of human serum albumin (HSA) and L-alpha-dimyristoylphosphatidic acid (DMPA) on a template and subsequent removal of the core is studied as a function of pH value and supplementary layers. The capsules were permeable for macromole…
The synthesis and characterization of a series of ruthenium bis(bipyridine) complexes where the inorganic moiety acts as a photolabile protecting group is described. Complexes of the type [Ru(bpy)2L2]+ where bpy = 2,2'-bipyridine and L = butylamine, gamma-aminobutyric acid, tyramine, tryptamine, and serotonin were stu…
Herein we report on the intercalation of polyaniline, poly(2-ethylaniline), and poly(2-propylaniline) into graphite oxide. This was achieved by taking advantage of the exfoliation/reconstruction properties of the layered host. The resulting intercalates were characterized by powder X-ray diffraction and thermogravimet…
We produced the B7Au2- mixed cluster and studied its electronic structure and chemical bonding using photoelectron spectroscopy and ab initio calculations. The photoelectron spectra of B7Au2- were observed to be relatively simple with vibrational resolution, in contrast to the complicated spectra observed for pure B7-…
Cyanobacteria are often the key organisms in microbial mats. They form dense micrometer-scale communities in which the full plethora of microbial metabolism can be present. Such mats are therefore excellent model systems and because of their analogy with Precambrian stromatolites they are also attractive for evolution…
Reverse microemulsion techniques combined with templating strategies have led to the synthesis of four types of nanoparticles. First, homogeneous SiO 2 -coated Fe 2 O 3 (SiO 2 /Fe 2 O 3 ) nanoparticles with controlled SiO 2 shell thickness (1.8−30 nm) were synthesized by reverse microemulsion. These nanocomposite part…