Materials Literature
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We report repetitive phase-change memory (PCM) activity via the high- to low-resistance state transition in gallium-doped indium oxide (Ga:InO) induced by nanosecond electric pulses. The amorphous-to-crystalline phase transition of Ga:InO is found to occur at a crystallization temperature of ∼250 °C with an activation…
Einleitung Die unterschiedliche Protonendichte der Gewebe ermöglicht die Abgrenzung pathologischer Veränderungen mit der Magnetresonanztomografie (MRT). Durch den hohen Weichteilkontrast der Methode können sowohl fokale Läsionen als auch diffuse Erkrankungen in parenchymatösen Organen und im zentralen Nervensystem (ZN…
Glass fibres are among the most versatile industrial reinforcement materials known today. A range of glass formulations can be spun into fibres, some of which are specific to the application of the composite. However, E-glass fibres have a good balance of properties and manufacturing cost that they dominate the indust…
The high-rate reactive ion etching of c-axis oriented quasi-single-crystal barium hexaferrite (BaM) films, deposited on 6-H silicon carbide (0001) substrates, has been demonstrated. Arrays of BaM columns, having diameters of 1–4 μm and sharp vertical walls, were etched from BaM films at rates as high as 75 nm/min usin…
We study numerically small-amplitude oscillations in capped single-walled carbon nanotubes and predict the existence of surface modes localized at capped tips of the nanotubes. These modes are similar to the surface Tamm states found in solids and optics at the edges of truncated lattices.
An optically pumped vertically emitting all-organic laser, based on a holographic polymer dispersed liquid crystal reflection grating operating in a distributed feedback configuration, is presented. The used experimental geometry overcomes the main drawbacks characterizing similar systems, allowing virtually infinite…
Abstract Three orientations to choose from : 2D hexagonal organically functionalized mesoporous silica nanoparticles with tunable mesochannel orientation (straight, helical, and radial mesochannels) were synthesized through a simple addition of various amounts of ureidopropyltrimethoxylsilane (UDPTMS) in the condensat…
We report the design and fabrication of nanoscale resonant gratings which is of interest for narrow bandwidth filtering application. The linear/circular grating structures, of which the grating width is 200nm and the grating height is 260nm, are generated on silicon-on-insulator wafer. Nanoscale gratings are fabricate…
Carbon nanotube (CNT) and polymer composite materials were obtained using two manufacturing processes. The first method is dispersion of CNT in a solvent-doped poly(ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) solution. The composite retains high optical properties because of the polymeric system and show…
Electric field controlled formation and dissociation of multiwalled carbon nanotube (MWCNT) conductive pathways in a polycarbonate (PC) melt are investigated by the dynamic percolation measurement. The results show that field-induced MWCNT alignment causes the decrease in the activation energy of conductive pathway fo…
A quartz crystal microbalance with dissipation monitoring (QCM-D) was used to study the adsorption of the layer formed by silica nanoparticles (SNP) and cellulose nanofibrils (NFC) together with cationic polyacrylamide (C-PAM) on cellulose surface, accompanied by use of atomic force microscope (AFM) to study the inter…
Conventional rolling and asymmetric rolling (ASR) processes were applied to aluminium alloy AA5754 with different roll metal frictional conditions. The rolling textures were determined by X-ray diffraction technique and the formation of shear texture was studied. It has been demonstrated that the ASR and friction have…
The cusp epithelium is a specialized branch of the superior epithelium that surrounds the developing teeth of chitons and is responsible for delivering the elements required for the formation of biominerals within the major lateral teeth. These biominerals are deposited within specific regions of the tooth in sequence…
Aqueous dispersions of silica nanoparticles have been aggregated through the addition of Al13 polycations and then submitted to osmotic compression. The structures of these dispersions have been determined through small-angle neutron scattering, before and after compression. Some dispersions consisted of mixtures of a…
We elucidate the structural transitions in a helical off-lattice homopolymer induced by crowding agents, as a function of the number of monomers ($N$) and volume fraction (${\ensuremath{\phi}}_{c}$) of crowding particles. At ${\ensuremath{\phi}}_{c}=0$, the homopolymer undergoes transitions from a random coil to a hel…
To avoid carbonation of small organic molecule oxidation in alkalines by using noble metals in acid, as well as to keep the proton transfer capability of polyaniline (PAn) in an acidic medium, we investigated formic acid oxidation on PAn-supported Pd catalysts in a weak acid solution of (NH 4 ) 2 SO 4 . PAn was electr…
A SERS ultradetection platform assembled from a commercially available PEG/PS graft copolymer and gold ions (see image) is shown to be optically and chemically stable, highly reproducible, and scalable. The tremendous simplicity of fabrication and low cost could make these materials a valuable tool for many potential…
Bis-MPA dendron-coated free-base tetraphenylporphyrin and zinc-tetraphenyl-porphyrin (TPPH(2) and TPPZn) were studied in comparison with simple porphyrins (H(2)P, ZnP) by theoretical simulation of their infrared, Raman and electronic absorption spectra, as well as fluorescense emission. Infrared and fluorescence spect…
Processing behaviors of starch film using a twin screw extruder were studied; in particular the effect of processing conditions, such as temperature, screw speed, feeding speed, and water content, on the extrusion torque and die pressure were systematically investigated. A specific focus of this work was to investigat…
The magnetoelectric (100−x)BaTiO3–(x)NiFe1.98O4 (x=20, 40, 60, and 80 wt %) particulate composites have been prepared and the effects of size and interface are studied through microscopy measurements. Large magnetoelectric voltage coefficient (αE) values accompanied by large piezoelastic coefficient, large magnetostri…