Materials Literature
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Azobenzene-based photoswitchable compounds can be use to photocontrol a variety of biochemical systems. In some cases, their effectiveness may be limited by the size of the conformational change that the switch undergoes. To produce an azobenzene photoswitch that undergoes a large end-to-end distance change upon isome…
Three perylene tetracarboxylic diimide (PDI) trimers substituted with different side groups at the bay positions were prepared with the triazine ring as a linkage. The free rotation of C-N-C bonds between the triazine ring and the PDI unit provide these molecules with some flexibility. The UV-vis absorption and fluore…
A facile polymer-template-aided synthesis is adopted to prepare single crystalline La0.7Sr0.3MnO3 nanowires by chemical solution deposition. The La0.7Sr0.3MnO3 nanowires crystallize in a novel monoclinic phase and exhibit ferromagnetic ordering at room temperature.
Amorphous CdSe nanoparticles were prepared by a base-catalyzed room-temperature reaction between cadmium nitrate and selenourea, with dodecanethiol as a capping ligand. The nanoparticle size could be controlled from 1.9 to 3.6 nm by increasing the water concentration in the reaction. When the nanoparticles were heated…
Abstract The initial stage of fiber structure development in the continuous neck‐drawing of amorphous poly(ethylene terephthalate) fibers was analyzed by in situ wide‐angle X‐ray diffraction, small‐angle X‐ray scattering, and fiber temperature measurements. The time error of the measurements (<600 μs) was obtained…
An analysis of capillary forces in wet paper and between two wet sheets leads to a number of interesting conclusions. Experimentally, it is found that the (static) friction force between two rewetted sheets is a maximum (4.8 kN/m 2 ) at a solids content of 38%, at which the air−water surface area is estimated to be a…
Optimization of the urea dosing system to maximize deNOx performance and to minimize NH3 slip during load changes is one of the main challenges for the mobile application of the urea–SCR (selective catalytic reduction) system. A mobile SCR system is restricted to a short distance between the engine exhaust and the cat…
Three cationic polymers with molecular weights and charge density of 3.0 x 10(5) g/mol and 10% (D 6010), 1.1 x 10(5) g/mol and 40% (D6040), and 1.2 x 10(5) g/mol and 100% (D6099) were investigated in aqueous NaCl solutions in the presence of silica. The atomic force microscope (AFM) colloidal probe technique was used…
Molecular dynamics computer simulations are performed to study structure and structural relaxation in the glassforming metallic alloy ${\text{Al}}_{80}{\text{Ni}}_{20}$. The interactions between the particles are modeled by an effective potential of the embedded atom type. Our model of ${\text{Al}}_{80}{\text{Ni}}_{20…
Hollow microspheres with multilayered porous shells are formed by a template-free method by hierarchical assembly of azithromycin molecules. This simple, rapid, and high-yielding method allows the number of layers to be tailored by regulating the initial concentration of azithromycin solution. Such structures may find…
We present point-contact spectroscopy data for junctions between a normal metal and the newly discovered F-doped superconductor LaO 0.9 F 0.1−δ FeAs (F-LaOFeAs). A zero-bias conductance peak was observed and its shape and magnitude suggest the presence of Andreev bound states at the surface of F-LaOFeAs, which provide…
We report the synthesis of atypical nanoparticles in donut shape with or without additional spherical nanoparticles attached on them by using the donut-like nanostructure formed in a thin film of triblock copolymers. In a high-humidity condition, a spin-coated film of triblock copolymer had donut-like holes consisting…
Different phases from the ZrO 2 −Y 2 O 3 system corresponding to 8, 10, 14, 21, 32, and 37 mol % Y 2 O 3, prepared by quenching from high temperature, have been studied by selected area electron diffraction (SAED) and high-resolution electron microscopy (HRTEM). The results of the 8 and 10 mol% Y 2 O 3 are consistent…
Spectral graph theory has proven to be very useful for text search and retrieval and for refining predictive-analysis systems.
The structural and electronic properties of Au and Au 2 adsorbed on five coordinated oxygen and magnesium regular terrace sites, on the neutral F s color center (oxygen vacancy containing two electrons), and on the charged F s + color center (oxygen vacancy containing one electron) of the MgO(100) surface have been in…
Microporous, highly monodisperse single-crystal-like NaTi2(PO4)3 nanoparticles with a strong acidic surface and uniform size are prepared by using calf thymus DNA as a structure-directing agent under acidic conditions. The nanoparticles (see image) were very active, stable, and selective catalysts for the ketalization…
It is found that 4,4'-bipyridines functionalized in their 3,3'-positions with Fréchet dendrons of 0th to 3rd generation self-assemble with (dppp)M(II) triflates (dppp: bis-(diphenylphosphino)propane; M = Pd, Pt) into metallo-supramolecular squares. They bear a nanometer-sized cavity inside an unpolar dendritic shell.…
We performed systematic adsorption studies using self-ordered nanoporous anodic aluminum oxide (AAO) in an extended range of mean pore diameters and with different pore topologies. These matrices were characterized by straight cylindrical pores having a narrow pore size distribution and no interconnections. Pronounced…
Previous studies have demonstrated that (-)-epigallocatechin gallate (EGCG), a green tea polyphenol, protects against ischemia and reperfusion-induced injury in many organ systems. Here, we test the hypothesis that part of EGCG's neuroprotective effects may involve a modulation of matrix metalloproteinases (MMPs) afte…
The observation of bridge-mediated excitation energy transfer (EET) has raised questions on the physical origin of such an effect. In this work, we studied the effect of bridge fragments in the Coulomb coupling, the major contribution to the electronic coupling in an EET process. For a series of ortho-phenyleneethynyl…