Materials Literature
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Abstract Thermoplastic chitosan/natural rubber blends (Cs/NR) were prepared from natural rubber latex and chitosan by solution casting technique. The blends were characterized by mechanical analysis (stress–strain) and the mechanical properties were found to vary with chitosan/natural rubber ratios. Experimental value…
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The Ba0.6Sr0.4TiO3 (BST)/poly(methyl methacrylate) (PMMA) tunable composites in 1-3-type structure consisting of BST rods in low-permittivity PMMA matrix are fabricated by dice and fill technique. For the composite containing 41.6vol% BST, the permittivity and the loss tangent of the composite are 1212 and 0.026 at 10…
High-quality CdS nanowires with wurtzite structure were produced by thermal evaporation of CdS powder. The nanowires were core-shell structures, consisting of crystalline core and amorphous/polycrystal shell. The intensity of the second-order longitudinal phonon mode in the Raman spectrum of the CdS nanowires is highe…
Abstract Two series of melt‐processable polyimides were prepared from 4,4′‐bis(3‐amino‐5‐trifluoromethylphenoxy)biphenyl ( m ‐6FBAB) and 4,4′‐bis(4‐amino‐5‐trifluoromethylphenoxy) biphenyl ( p ‐6FBAB) with various aromatic dianhydrides. The effects of the chemical structures of the polyimides on their properties, espe…
The viscosity of melts in the Na 2 O-CaO-Al 2 O 3 -SiO 2 system follows the same trend as a function of composition as that observed in the Na 2 O-Al 2 O 3 -SiO 2 system; in that there is a local maximum in viscosity at the condition Na 2 O+CaO ~Al 2 O 3 . This is despite the difference in charge of Na + and Ca 2+ , t…
Abstract Polyether(bisurethane‐bisurea‐bisamide)s (PEUUA) based on poly(tetramethylene oxide) (PTMO) were synthesized by chain extension of PTMO endcapped with a diisocyanate (DI), and a diamine–diamide extender. The prepolymers were PTMOs with molecular weights between 1270 and 2200 g mol −1 , either endcapped with 4…
The (001) surface of the hexagonal hydroxyapatite HA [Ca 10 (PO 4 ) 6 (OH) 2 , layer group P 3] is simulated with the slab approach by fully optimizing (cell size and internal coordinates) two models, respectively 6 A and 14 A thick, in a fully ab initio periodic approach. The B3LYP hybrid functional and a Gaussian ba…
Starting from 1,3-phenylene linked diporphyrin zinc(II) complex 2ZA, repeated stepwise Ag I-promoted coupling reactions provided linear oligomers from 2nZA up to 128ZA. Of these zigzag shaped porphyrin arrays, the Ag I-promoted intramolecular cyclization reaction of 2 nZA (n=5, 6, 8, 9, 12, and 16) under dilute condit…
Abstract A symmetrical (p/p) supercapacitor has been fabricated by making use of activated carbon (AC)‐polyethylenedioxythiophene (PEDOT)‐composite electrodes for the first time. The composite electrodes have been prepared via electrochemical deposition of β‐napthalenesulphonate doped PEDOT onto AC electrodes. The cha…
In microelectronics technologies, patterning of sub-100nm width ridges capped with a titanium nitride mask can lead to undulations of the ridges detrimental to performances. This phenomenon is observed with highly compressive residual stress into the mask (>2GPa), with dielectrics with low elastic properties (E…
We have demonstrated that oxidation states in uranium-oxides such as UO2 and U3O8 can be controlled through epitaxial stabilization by growing single-crystal-like films. We have further shown that the growth of polymorphic uranium oxides is feasible by using different substrates with appropriate in-plane lattice param…
Direct covalent LBL assembly was performed on silica particles using PGMA and PAH as the building blocks. After core removal, hollow microcapsules with ultrathin shells and good shell completeness were obtained. The microcapsules have good mechanical strength and stability against extreme pHs and elevated temperature…
Abstract We reported the mechanical properties of the polyelectrolyte multilayer nano‐coated electrospun fiber mats with different number of layers. Multilayer nano‐coatings composed of layers of PSS and PAH were successfully deposited onto electrospun nylon 6 fibers via layer‐by‐layer self‐assembly. Compared with pur…
Ultrafine fibers of a pH-responsive triblock copolymer with different diameters, alignment, and microdomain order are prepared via electrospinning and solvent-vapor annealing. Fibrous samples display much quicker response times than the corresponding films owing to the increase in external surface area. The fibrils of…
Single phase, epitaxial, transparent, and p-type CuAlO2 films are successfully grown on c-plane sapphire by polymer-assisted deposition. At wavelengths in the range of 400–1000 nm, the optical transmittance of the films is 60–80 %. The energy band gap is 3.6 eV. The as-synthesized CuAlO2 films are highly resistive, wi…
Molecular diffusion in unidimensional channel structures (single-file diffusion) is important to understand the behavior of, e.g. , colloidal particles in porous materials (zeolites) and superconducting vortices in 1-dimensional (1D) channels. Here the diffusion of charged massive particles in a 1D channel is investig…
The standard technique to make electrical contact to nanostructures is electron beam lithography. This method has several drawbacks including complexity, cost, and sample contamination. We present a simple technique to cleanly solder submicron sized, Ohmic contacts to nanostructures. To demonstrate, we contact graphen…
We investigate the reflection properties of electromagnetic/optical waves in isotropic lossless and lossy chiral media. When the chiral parameter is strong enough, we show that an unusual negative reflection occurs at the interface between a chiral medium and a perfectly conducting plane, where the incident wave and o…
The formation of Schottky barrier contacts to hydrogen peroxide treated ZnO has been investigated. Low resistivity hydrothermally grown single crystal ZnO wafers of n-type were used. Pd contacts deposited on organic solvent cleaned O face (0001¯) showed Ohmic behavior, while on the H2O2 treated O face up to nine order…