FIB-SEM Nanotomography in Materials and Life Science at EPFL
Extended abstract of a paper presented at Microscopy and Microanalysis 2010 in Portland, Oregon, USA, August 1 – August 5, 2010.
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High Temperature Aqueous Corrosion and Deuterium Uptake of Coupons Prepared from the Front and Back Ends of Zr-2.5Nb Pressure Tubes
Abstract Pressure tubes for CANada Deuterium Uranium (CANDU) reactors are extruded from billets of Zr-2.5Nb, at a temperature of ∼815°C, and then cold drawn to give a final length of ∼6 m. The manufacturing process often results in a variation of properties along the length of a tube including grain structure, texture…
Discussions on the non-equilibrium effects in the quantitative phase field model of binary alloys
All the quantitative phase field models try to get rid of the artificial factors of solutal drag, interface diffusion and interface stretch in the diffuse interface. These artificial non-equilibrium effects due to the introducing of diffuse interface are analysed based on the thermodynamic status across the diffuse in…
The Role of Fluoride Ions on the Corrosion of Ti36 in Normal Saline Solution as applied to Dental Implants
The corrosion behavior of a newer beta titanium alloy, Ti36, in normal saline has been compared to that in normal saline containing 2% NaF using open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy measurements to ascertain its suitability for dental implant applications invo…
Isothermal Crystallization Kinetics of Tricomponent Blends of Polycarbonate, Poly(Trimethylene Terephthalate) and Polybutylene Terephthalate
The isothermal crystallization kinetics of two different types of linear aromatic polyesters, namely poly(trimethylene terephthalate) (PTT), poly(butylene terephthalate) (PBT) and their blend with polycarbonate (PC) has been investigated using differential scanning calorimetry (DSC). The blend composed of PTT25/PBT25/…
Real-time observation of the effect of iron on receptor-mediated endocytosis of transferrin conjugated with quantum dots
The optical properties of antiphotobleaching and the advantage of long-term fluorescence observation of quantum dots are fully adopted to study the effects of iron on the endocytosis of transferrin. Quantum dots are labeled for transferrin and endocytosis of transferrin in HeLa cells is observed under the normal state…
Investigation on the dielectric properties of nano-titanium dioxide — low density polyethylene composites
Dielectric properties of nano-titanium dioxide (TiO2) with diameter about 25 nm - low density polyethylene (LDPE) composites were investigated at the temperature ranging from 293 K to 343 K with the frequency ranging from 0.1 Hz to 100 kHz in the present paper. Experimentally, we observed two peaks in the spectrums; o…
Measurement of corona discharge on polymer insulator through the UV rays sensor including optical lens
This paper studies a measurement of ultra-violet (UV) emission of corona discharges on polymer insulators using an UV rays sensor including an optical lens. In addition, these data have been compared with the images of an UV rays camera. The detection of an UV rays signal begins at 60kV, which is about 37.5% of the br…
Application of nonlinear methods in tracking failure test of epoxy/SiO<inf>2</inf> nanocomposite
This paper investigates the effect of nano-scale SiO2on the tracking failure properties of nanocomposites. Test samples were made by dispersing nano-scale SiO2powder in epoxy with the weight ratios of 0, 1, 3, 5, 7, 9 wt%. AC voltage was applied on a pair of needle-plate electrodes at the surface with the insulation d…
Deformation behavior of pure titanium at a wide range of strain rates
Plastic deformation behavior of pure titanium has been investigated using a tensile test at a various range of strain rates. Flow stress curves reveal that the work hardening behavior depends on the strain rates. The higher strain rates, the more work hardening. Dislocation cell structure has been developed after the…
A Model for the Contact Angle of Liquid Droplets on Rough Surfaces
Up to now, measured results of the contact angle on rough surfaces have been explained usually based on the Wenzel equation (1936) and the Cassie–Baxter equation (1944). However, these equations do not take into account considerations of liquid wetting behaviors on rough surfaces, and this leads to poor understanding…
Synthesis and characterisation of PANI–Co in presence of magnetic field
Polyaniline–Co (PANI–Co) was synthesised using peroxydisulphate as an oxidant in a solution containing 0·1 mol L–1 aniline and 0·5 mol L–1 HCl and adequate CoCl2.6H2O in the applied magnetic field. The electron paramagnetic resonance spectrum displayed that there were unpaired electrons in PANI–Co, the spin density of…
Thermodynamic modeling of the Pt–Zr system
Abstract By means of the CALPHAD (CALculation of PHAse Diagram) technique, the Pt–Zr system was critically assessed. The solution phases (liquid, bcc, fcc and hcp) are described with the substitutional model. The intermetllic compounds Pt 4 Zr, Pt 4 Zr 3 , αPtZr and Pt 3 Zr 5 are treated as the formula (Pt,Zr) m (Pt,Z…
Plasma-electrolytic oxidation of valve metals in Zr(IV)-containing electrolytes
The studies devoted to the production of Zr-containing coatings on valve metals (Ti, Al, and Mg) using plasma-electrolytic oxidation are reviewed. The coatings are formed from aqueous electrolyte suspensions containing dispersed ZrO 2 particles, as well as Zr(IV) fluorocomplexes, polyphosphate, and tartrate complexes,…
Synthesis of conducting polymers and their characterization
Nanostructures of. conducting polymer (polypyrrole) have been fabricated by chemical synthesis using non-galvanic method within the pores of polycarbonate membrane. Polycarbonate (Makrofol KG) foil of thickness 10 μm and diameter 100 nm having flux 10 5 /cm 2 purchased from Whatman, UK has been used as template for th…
Increasing strength, ductility and impact toughness of ultrafine-grained 6063 aluminium alloy by combining ECAP and a high-temperature short-time aging
Since fully-dense ultrafine or nanocrystalline bulk materials can be processed, there has been an increasing scientific interest in several plastic deformation (SPD) procedures, particularly in the last decade. Especially the equal-channel angular pressing (ECAP) has widely been investigated due to its ability of prod…
The Influence of Tetracycline Loading on the Surface Morphology and Biocompatibility of Films Made from P(3HB) Microspheres
Abstract Tetracycline, an antibiotic used against a broad range of Gram positive and Gram negative bacteria was encapsulated in microspheres made of poly(3‐hydroxybutyric acid) P(3HB), a microbial biodegradable polymer isolated from Bacillus cereus SPV. The drug loaded microspheres were prepared using an oil emulsion…
Deformation twinning in polycrystalline NiMnGa alloys
The texture and local orientation after compression of a NiMnGa polycrystal and a bicrystal with 5M modulated structure were measured with synchrotron radiation and electron backscatter diffraction (EBSD), respectively. Compression of both samples leads to motion of those twin boundaries changing the volume fraction o…
Synthesis and Characterization of Hippurate-Layered Double Hydroxide Nanohybrid and Investigation of its Release Property
The anion of hippuric acid, hippurate (A-), as an organic guest was intercalated into the interlayers of anionic clay, Zn/Al hydrotalcite-like or layered double hydroxides (LDH) host by direct co-precipitation method from aqueous solution for the formation of new nanohybrid compounds, Zn/Al-hippurate nanohybrids (ZAHs…
Influence of etching current density on the morphology of macroporous silicon arrays by photo-electrochemical etching
Macroporous silicon arrays (MSA) have attracted much attention for their potential applications in photonic crystals, silicon microchannel plates, MEMS devices and so on. In order to fabricate perfect MSA structure, photo-electrochemical (PEC) etching of MSA and the influence of etching current on the pore morphology…