Materials Literature
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Alloy phases in the as-aged (T6) ZK60 magnesium alloy were investigated. More attentions were paid to types and morphologies of main alloy phases in the as-aged ZK60 magnesium alloy. The experimental results indicated that there was an abundant flower-shaped segregation in the solution-treated ZK60 magnesium alloy. A…
Influences of Ca addition on microstructures and mechanical properties at room and elevated temperatures up to 300oC have been investigated for EZ43 (Mg-4%RE-3%Zn)-(0~1.2)%Ca permanent mould casting alloys, based on experimental results from optical micrography, X-ray diffractometry, scanning electron microscopy combi…
The effect of manganese on grain refinement of a commercial AZ31 alloy has been investigated using an Al-60%Mn master alloy splatter as an alloying additive at 730 °C in aluminium titanite crucibles. It is shown that grain refinement by manganese is readily achievable in AZ31. Electron microprobe analyses reveal that…
We demonstrate a strategy for microfabricating catalytically active, three-dimensional matrixes composed of cross-linked protein in cellular and microfluidic environments. In this approach, a pulsed femtosecond laser is used to excite photosensitizers via multiphoton absorption within three-dimensionally defined volum…
One-dimensional semiconductor nanoribbons of hexagonal wurtzite sulfides (ZnS and CdS) have been prepared in bulk quantity by a thermal evaporation technique using thiol-capped gold nanoparticles as catalysts. Compared to their starting materials, ZnS and CdS powders, the band-gap photoluminescence excited by ultravio…
The presence of various counteranions in the interfacial region of the silicate−surfactant mesophase introduces opportunities for manipulation of the phase structure. Well-ordered three-dimensional hexagonal P 6 3 / mmc, cubic Pm 3̄ n, two-dimensional hexagonal p 6 mm, and cubic Ia 3̄ d mesoporous materials have been…
Pure Bi4Ti3O12 ceramics were prepared using the conventional solid-state reaction method. In order to find the relationship between the ferroelectric properties and oxygen vacancies, we changed the concentration of oxygen vacancies inside the ceramics through different processes of oxygen treatment. Ferroelectric meas…
A recent review of some of the data used revealed some errors.Specifically, the calculation of the hydrolysis and condensation rate constants are incorrect by roughly a factor of 2, because the starting molarity used for trimethylethoxysilane was actually 2 M, rather than the 4 M that was used in our calculations.Furt…
Expanded ensemble density-of-states simulations and a connectivity altering algorithm are used to investigate the effective interactions that arise between nanoparticles suspended in polymer solutions. Our calculations with systems of long polymeric chains reveal oscillations in the effective polymer-induced interacti…
Nass oder trocken: Filme aus Titandioxid-Nanostäbchen mit mikro- und nanoskaligen hierarchischen Oberflächenstrukturen (links) sind superhydrophob (Mitte), sie werden aber reversibel superhydrophil (rechts), wenn sie UV-Licht ausgesetzt werden. Dieser Wechsel beruht auf einer Kooperation der speziellen Oberflächenstru…
Effect of thermal diffusion of indium in ZnO thin films, prepared using spray pyrolysis technique, is discussed. ZnO:In films were characterized using different techniques such as x-ray diffraction (XRD), photoluminescence, electrical resistivity measurements, and optical absorption and transmission. The XRD analysis…
This work reports the first complete FTIR characterization of H2, N2 and C2H4 molecular complexes formed on the Cr(II) sites in the Phillips catalyst. The use of a silica aerogel as support for Cr(II) sites, substituting the conventional aerosil material, allowed us to obtain a remarkable increase in the signal-to-noi…
OBJECTIVES: To design an in-situ gelling hydrogel capable of solidifying rapidly under physiologic conditions into a hydrogel capable of adhering tissue surfaces together. DESIGN: Multifunctional polymers containing covalently bound peptide substrates of transglutaminase were designed. EXPERIMENTAL VARIABLE: Enzyme cr…
Relaxor ferroelectrics near the morphotropic phase boundary were prepared by pressureless sintering at various temperatures in order to study the influence of grain size on phase composition and electrical properties. Investigations of the microstructure indicate an increase in grain size from 0.5to3.7μm when the sint…
Raman scattering (RS) from semiconductor nanostructures provide excellent information on the size of the crystallites. Processing history of most nanocrystalline semiconductors suggests natural incorporation of a distribution of crystallite sizes. In this paper, we report on the influence of crystallite size distribut…
The use of magnesium in motor vehicles today and in future depends on numerous technical and economical factors, though the cost factor is essential. How might use of magnesium in vehicles develop, what prerequisites are necessary, what R&D efforts are required These questions will be addressed as follows based on…
A 1.54-μm emission from erbium-doped sol-gel SiO2 was strongly enhanced by doping Au nanoparticles. The enhancement factor depended on Au concentration and was the largest at the concentration of 1.0mol%. The photoluminescence enhancement was accompanied by the lengthening of the lifetime, suggesting that the enhancem…
La (1 - x ) Sr ( x ) PO 4 materials are very stable at high temperature and water vapor partial pressure and they show protonic conductivity; thus, they could be used as electrolytes in HTPFCs (high-temperature protonic fuel cells), hydrogen sensors, and hydrogen separation technology. This work describes the combusti…
A two-dimensional (2D) subwavelength nanostructure for antireflection coating is fabricated upon a transparent substrate. Self-assembled 2D colloidal crystals are used as a nanoscale composite material with controlled thickness and low refractive index. The feature size of the structure is approximately 105 nm. The st…
The elastic strain of lead-free relaxor K0.5Na0.5NbO3–SrTiO3 ceramic system, induced by applied electric fields with amplitudes up to 40kV∕cm, has been investigated. The strain response, being similarly low (order of 10−5) as in the classical lead magnesium niobate relaxor, is shown to be of solely electrostrictive or…