Materials Literature
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The synthesis of several UO(2)-alaskaphyrin derivatives functionalized with aliphatic chains is described. These compounds are found to be liquid-crystalline and form columnar mesophases, as judged from polarizing optical microscopy studies, and represent the first uranium-containing discotic mesogens.
Abstract The electronic structure of three model potentials for quantum dots has been studied. The potentials are of finite depth and spherical symmetry and have a range between 5 to 25 nm. The sequence of electronic states differs markedly from the one familiar from atomic systems. The occurrence of high angular mome…
We investigated poly(2,2-bis(trifluoromethyl)-4,5-difluoro-1,3-dioxide-co-tetrafluoroethylene (Teflon AF 2400, Tg = 240 degrees C), a stable and permeable fluorous polymer, as a transport/extraction medium for solutes for the first time. From the study of transport behavior of a series of solutes (in chloroform soluti…
Dihydroxyacetone (Dha) kinases are a sequence-conserved family of enzymes, which utilize two different phosphoryldonors, ATP in animals, plants, and some bacteria, and a multiphosphoprotein of the phosphoenolpyruvate carbohydrate phosphotransferase system (PTS) in most bacteria. Here, we compare the PTS-dependent kina…
PURPOSE: To investigate the duration of liver R2* enhancement and pharmacokinetics following administration of an iron oxide nanoparticle in a rat model. MATERIALS AND METHODS: Rats were injected with 0, 1, 2, or 5 mg Fe/kg of NC100150 Injection, and quantitative in vivo 1/T2* liver measurements were obtained between…
In this paper, a nonlinear theory applicable to the design of nanotube based devices is presented. The role of finite kinematics for a doubly clamped nanotube device is investigated. In particular, we analyze the continuous deformation and instability (pull in) of a clamped-clamped nanotube suspended over an electrode…
(1)H NMR spectra of three paramagnetic Ni(II) complexes of benziporphyrins have been investigated in a broad temperature range. For the m- and p-benziporphyrin complexes, the line widths of certain signals exhibit an unusual temperature dependence characteristic of a dynamic process. This behavior is interpreted in te…
Dimensionality is an important governing factor in the electronic structures of semiconductor nanocrystals. The quantum confinement energies in one-dimensional quantum wires and zero-dimensional quantum dots are quite different. Using large-scale first-principle calculations, we have systematically studied the electro…
A novel solid-state polymer electrolyte was constructed using layer-by-layer (LbL) polyelectrolyte assembly of linear poly(ethylenimine) (LPEI) and poly(acrylic acid) (PAA), combined with a plasticization step using oligoethylene glycol dicarboxylic acid (OEGDA). This composite film exhibits a relatively high ionic co…
The structure of the ${\text{Ca}}_{3}{\text{Co}}_{2}{\mathrm{O}}_{6}$ compound is made of chains on a triangular array. The intra- and interchain coupling are ferromagnetic and antiferromagnetic, respectively, and the chain itself contains a 1:1 alternation of ${\text{CoO}}_{6}$ trigonal prisms (TP) and octahedra (oct…
2-Deoxyribose-5-phosphate aldolase catalyzes a reversible aldol condensation of two aldehydes via formation of a covalent Schiff-base intermediate at the active lysine residue. The crystal structure of 2-deoxyribose-5-phosphate aldolase from Thermus thermophilus HB8 has been determined with and without the substrate a…
A new modification of Ba 2 SnTe 5 was prepared by directly reacting the elements in stoichiometric ratios at 750 °C, while the first reported modification was formed in a potassium polytelluride flux at 450 °C. The former crystallizes in a unique structure type with SnTe 4 tetrahedra, SnTe 5 trigonal bipyramids, and n…
The variations of flexural strength and flexural modulus of unsaturated polyester-based sisal/glass hybrid composites with fiber content have been studied. The hybrid composites showed an increase in flexural properties with glass fiber loading. The effects of alkali treatment and silane treatment of fibers on the fle…
The crystallization behavior of the poly(ethylene oxide) (PEO) component in poly(butylene succinate) (PBS)/PEO blends with the middle PEO content was investigated as a function of isothermal crystallization temperature of the PBS component ( T IC,PBS ) using differential scanning calorimetry (DSC). It is found that th…
Graphitic impurity nanoparticles were reorganized outside and inside of carbon nanotubes to produce novel tube-in-tube nanostructures. The graphitic nanoparticles were disintegrated into small graphene sheets by an intercalation−exfoliation process with nitric acid, during which the graphene sheets were simultaneously…
We focus on the role of water in a protein-resistant poly(ethylene glycol) (PEG) layer. Using the combination of two experimental techniques, namely, the extended surface forces apparatus and the quartz crystal microbalance, we demonstrate that the water content inside these surface-grafted layers is over 80 vol % whi…
Filled doughnuts: Molybdenum crown cluster MC accommodates up to three molecules of aminophenyl-substituted metalloporphyrins through hydrogen-bonding interactions, to form discrete inorganic–organic nanocomposite materials (see picture; blue polyhedra=MC, space-filling model=metalloporphyrin). Ultrahigh-vacuum scanni…
The high magnetic field electronic state of the quasi-two-dimensional organic superconductor,$\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BETS})}_{2}\mathrm{Fe}{\mathrm{Br}}_{4}$ was investigated by the resistance measurements. At very low temperatures, magnetic-field-induced superconductivity (FISC) was observe…
CO2 gas was used to construct novel types of supramolecular polymers. Self-assembling nanostructures 11 and 13 were prepared, which employ both hydrogen bonding and dynamic, thermally reversible carbamate bonds. As precursors, calixarene ureas 1 and 2 were synthesized, which strongly aggregate/dimerize (K(D)>/=10(6) M…
Strengthening of carbon nanotube/epoxy resin composites was achieved by adding a small amount of copolymer (0.03 wt% of epoxy resin) as a dispersant. Tensile testing was used to measure mechanical properties. Young's modulus and fracture stress of the carbon nanotube composites with the copolymer were found to be abou…