Materials Literature
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Intensely luminescent fibers are prepared by the self-assembly of hybrid SiO2-coated CdTe nanocrystals (NCs), SiO2 monomers, and a complex of Cd2+ and thioglycolic acid. These fibers exhibit tunable photoluminescent colors (yellow to red) and morphologies (tubal, solid, and belt-like) with an extremely high concentrat…
Linked to the Pentagon: The addition of molybdate to [HBW(11)O(39)](8-) ions leads to the formation of mixed pentagonal units {W(Mo(5))} and {W(WMo(4))} trapped as linkers in the resulting modular assemblies, thus establishing the first link between the conventional Keggin ion derivatives and the giant molybdenum oxid…
Bulking up: The thermal barrier to rearrangement of a vic-disulfoxide is significantly increased through steric buttressing about the (O)S--S(O) bond. Whereas the title compounds represent the most thermally stable vic-disulfoxides known to date, they also undergo a novel photomediated epimerization at room temperatur…
Abstract Diameter separation of single‐walled carbon nanotubes is achieved via the density gradient ultracentrifugation process. Statistical analysis of the separated samples is performed using high‐resolution transmission electron microscopy (HRTEM). The evolution of the diameter distribution with respect to the grad…
We report on the energy-transfer mechanism between amorphous Si nanoclusters and erbium ions in a ${\text{SiO}}_{2}$ matrix. We have studied a set of optimized samples which show maximum ${\text{Er}}^{3+}$ to Si-nc coupling ratio. We demonstrate that the transfer mainly occurs to the ${^{4}I}_{11/2}$ level in less tha…
The structural relaxation of a glass forming liquid, methyl m-toluate, is studied in the deeply supercooled region near glass transition with the calorimetric and dielectric techniques. The thermodynamics and kinetics of the enthalpy relaxation are focused, and the kinetic studies are paralleled with dielectric relaxa…
We derive the effective action for superconducting fluctuations in a four-band model for pnictides, discussing the emergence of a single critical mode out of a dominant interband pairing mechanism. We then apply our model to calculate the paraconductivity in two-dimensional and layered three-dimensional systems and co…
The templated growth of gold nanoparticles in 3D arrays within the nanopores of unicellular diatoms involves pretreament of the skeletons with poly(vinylpyridine) which has a unique dewetting property. This self-assembly provides a nanochemical analogue of lithography for engineering complex nanostructures. The proces…
Motivated by the very recent fabrication of sub-10-nm-wide semiconducting graphene nanoribbons [X. Li et al., Science 319, 1229 (2008)], where some of their band gaps extracted from transport measurements were closely fitted to density-functional theory predictions for magnetic ordering along zigzag edges that is resp…
Four-terminal resistances, both longitudinal and diagonal, of a locally gated graphene device are measured in the quantum-Hall (QH) regime. In sharp distinction from previous two-terminal studies [J. R. Williams et al., Science 317, 638 (2007); B. \"Ozyilmaz et al., Phys. Rev. Lett. 99, 166804 (2007)], asymmetric QH r…
Polyhydroxyalkanoates (PHA) terployesters P(3HB-co-3HV-co-3HHx) consisting of 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), and 3-hydroxyhexanoate (3HHx) were produced by wild-type Aeromonas hydrophila 4AK4, its recombinant harboring PHA synthesis genes phaPCJ encoding PHA binding protein phasin, PHA synthase, and…
Abstract Composites with polyvinyl chloride (PVC) as major matrix constituent, ethylene vinyl acetate (EVA) as polymeric plasticizer and wood flour (WF) and fly ash (FA) as filler were extruded. Morphology of the samples was studied using scanning electron microscopy (SEM). Morphological study indicated good dispersio…
We report the synthesis, as well as the complex thermal and assembling properties, of a series of three triblock copolymers 1 − 3, each of which is based on aliphatic polyether third-generation dendron ends that contain tetradecyl peripheries and a hydrophilic linear poly(ethylene oxide) (PEO) middle block. Because of…
Single-walled carbon nanotubes (SWCNTs) were synthesized using ethanol CVD to study the nucleation kinetics of nanotube growth. By counting the number density of SWCNTs, i.e., the number of nanotubes per unit area on the substrate, the nucleation process of SWCNT growth was studied extensively within a wide range of g…
Abstract The structure and magnetic properties of double azido‐bridged CuII binuclear complex 1 with the chelating chiral ligand (S,S)‐2,2′‐isopropylidenebis(4‐phenyl‐2‐oxazoline) were analyzed by combining experimental and theoretical techniques. The CuII ions adopt a square pyramidal geometry with different degrees…
Abstract This communication describes an ultrasonically assisted in‐situ dynamic inverse emulsion polymerization process of aniline in the presence of multi‐walled carbon nanotubes (MWNT) in toluene. During polymerization, MWNT are coated with polyaniline (PANI), forming a core‐shell structure of nano‐wires observed b…
A new class of organic−inorganic liquid crystalline hybrid materials consisting of an azobenzene derivative and titanium oxide (6Az5COO-TiO and 6Az1COO-TiO) was synthesized. 6Az5COO-TiO with a C5 spacer showed a smectic liquid crystalline phase. The organic 6Az5COO and TiO inorganic components in the hybrid film were…
Abstract First‐principles LDA + U calculations have been performed to study the effects of oxygen vacancies (VO) on the electronic structure and magnetism in undoped rutile TiO2–x . Instead of treated as an adjustive parameter, the value of U was determined by constrained‐density‐functional calculations. The calculate…
A fluorous biphasic hexa(3,5-substituted-phenyl)benzene (HPB), analogous to semifluorinated alkanes, was synthesized such that precise chemical and orthogonally directed, supramolecular placement of amphiphilic side chains at their bulk density was achieved. The grafting or tethering of incommensurate hydrocarbon and…
The formation of helical scrolls formed by self-assembly of tethered nanorod amphiphiles and their molecular analogs are investigated. A model bilayer sheet assembled by laterally tethered nanorods is simulated and shown that it can fold into distinct helical morphologies under different solvent conditions. The helice…