Materials Literature
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A novel Pillar phase change memory based on fully integrated test arrays in 180nm CMOS technology has been successfully fabricated. A current-confining Pillar structure leads to a self-heating at the center of the chalcogenide layer, and needs only one additional mask level for its fabrication. Switching characteristi…
Thin-film libraries of libraries ( ; ) have been prepared by combinatorial sputter deposition. The libraries were subsequently annealed at 700, 800, and to induce structural and compositional changes. Respectable catalytic activity was achieved with libraries having and that were annealed at . This is explained in ter…
Hydroxyl functional poly(amidoamine) dendron wedges have been reacted with the surface of multi-walled carbon nanotubes and used for templating silver nanoparticles.
The new, monometal substituted silicotungstates [Mn(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (1), [Co(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (2) and [Ni(H(2)O)(2)(gamma-SiW(10)O(35))(2)](10-) (3) have been synthesized and isolated as the potassium salts K(10)[Mn(H(2)O)(2)(gamma-SiW(10)O(35))(2)] x 8.25 H(2)O (K-1), K(10…
The objective of this study was to characterize and evaluate the physicochemical properties and drug release profiles of hydrogels composed of silk protein (SP) polymers. SPs with a low MW (SPL, ca. 18 kDa) and a high MW (SPH, ca. 76 kDa) were used for preparing hydrogels. Both the random coil form and beta-sheet conf…
Nickel and cobalt mixed oxides [denoted as ] were electrochemically deposited onto carbon nanotube (CNT) film substrate with a three-dimensional nanoporous structure in aqueous solutions containing different ratios of cobalt(II) and nickel(II). For comparison, the were also prepared on nickel mesh substrate. Microstru…
In the study of pattern formation in bi-stable systems, the extended Fisher-Kolmogorov (EFK) equation plays an important role. In this paper, some a priori bounds are proved using Lyapunov functional. Further, existence, uniqueness and regularity results for the weak solutions are derived. Using C-1-conforming finite…
Ba 0.5 Sr 0.5 TiO 3 (BST) thin films are among the best-known ferroelectric and dielectric materials. Ce-doped BST films have been fabricated by pulsed laser deposition in order to enhance their dielectric properties. X-ray diffraction, atomic force microscopy, and Raman spectroscopy have been used to study variations…
An interesting scenario of unusual glassy states is observed from the dc and ac susceptibility measurements in LaMn0.5Fe0.5O3. The dc measurements at 5mT exhibit two distinct peaks at ∼20(Tg) and ∼255K(Tp). The large field-cooled effect and frequency-dependent results indicate a glassy state between Tg and Tp, while t…
Electrochemical biosensors based on conducting polymers offer many advantages and new possibilities to detect biologically significant compounds. Various biosensors, such as enzyme sensors, DNA sensors and immunosensors based on polyaniline are reviewed in this paper. Besides electrochemical detection methods, some ne…
We report a facile chemical route for the synthesis of uniform hexagonal yttrium phosphate hydrate nanocrystals and their assembly into close-packed regular superstructures through noncovalent interactions of long chain molecules attached to the surfaces of inorganic nanocrystals.
A series of neodymium complexes with various modified β-diketonates and their corresponding gadolinium complexes have been synthesized and characterized. The singlet and triplet energy levels of the coordinated ligands were measured and compared. These complexes emit characteristic Nd3+ light at about 880, 1060, 1330…
The electrode potential of a photochromic spiropyran-modified Au electrode could be reversibly modulated by UV/visible light irradiation in the presence of Zn2+, and a new molecular switch and an "AND" logic gate based on this electronic transduction of the optical signals were established.
The first example of assembling novel heteronuclear lanthanide–transition metal pseudorotaxanes where interpenetration of the lanthanide stoppered thread into the transition metal sensitiser containing macrocycle is signalled via sensitised near-infrared (NIR) lanthanide luminescence is described.
Scanning near-field optical microscopes enable optical measurements and observations with a spatial resolution far beyond the diffraction limit of light. This allows us to spatially resolve the positions in nanoparticles and at the same time to investigate spectroscopic characteristics point by point. In this feature…
The microstructure in 2.9 mol% Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1100°-1650°C was examined to clarify the role of Y3+ ions on the cubic-formation and grain growth processes. The cubic phase in Y-TZP stared to appear at 1300°C and the fraction of the cubic phase increased with the incr…
Effects of Ca alone and Ca/Sr composite additions on microstructures, die castability, mechanical properties and creep properties of the Mg-Al based alloys are investigated for the purpose of the development of new Mg-Al-Ca-Sr alloy for automotive powertrain applications. Ca addition of more than about 1% to AM50 allo…
Oilseed flax fiber could be used as reinforcement for composites because it is readily available, environmentally friendly and possesses good mechanical properties. Flax fiber was mixed with high density polyethylene (HDPE) with fiber content from 10 to 30% by mass and processed by extrusion and injection molding to b…
Undoped and Eu-doped were synthesized by a solid-state reaction method at under nitrogen–hydrogen atmosphere. The solubility of in was determined. Nitrogen can be incorporated into by replacement of by , whose amount of solubility depends on the M cation. The solubility of is very low in and lattices ( and 0.045, resp…
We have used neutron reflectometry to characterize the swelling behaviour of brushes of poly[2-(diethyl amino)ethyl methacrylate], a polybase, as a function of pH. The brushes, synthesized by the "" method of atom transfer radical polymerization, were observed to approximately double their thickness in low pH solution…