Materials Literature
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ZnO nanoparticles dispersed in a semiconducting polymer form the active layer of a solar cell (see Figure) that is able to convert up to 40 % of the incident photons at 500 nm into electrical current and has a power conversion efficiency of about 1.5 % in sunlight. Manufactured at low temperature using environmentally…
We show the anisotropic selective growth of gold tips onto semiconductor (cadmium selenide) nanorods and tetrapods by a simple reaction. The size of the gold tips can be controlled by the concentration of the starting materials. The new nanostructures display modified optical properties caused by the strong coupling b…
A reversible ordered state induced by the combined action of above band-gap light and temperature in a-Si1−xGex layers with 0⩽x<0.38 is reported. The experimental conditions for the observation of this effect are described, as well as the main phenomenological aspects. The illumination of these layers with abov…
We report the self-assembly and characterization of amorphous SiOx nanospheres with diameters 210–240 nm. The preparation method was based on hydrolysation-induced self-assembly with Na2SiO3 as the silica precursor and polyacrylamide gels as the template. Ultraviolet and blue–green photoluminescence were observed at r…
We report a Raman spectroscopy study of B12As2 under hydrostatic pressure up to 15 GPa. Mode Grüneisen parameters were determined for the B12As2 phonon modes. Phonon modes attributed to the As–As chain have a weak pressure dependence (0.6–1.9 cm−1 GPa−1) relative to inter- and intra-icosahedral vibrations (3.4–6.6 cm−…
We studied ferroelectric ordering in a triphenylene derivative embedded with electric dipoles [2,3,6,7,10,11-hexakis (4-octyloxy-benzoyloxy) triphenylene (HOBPT)] in a crystalline state. Experimental results indicate that the ferroelectricity in HOBPT is caused by an ordered orientation of $\mathrm{C}\mathrm{O}$ dipo…
The aim of this paper is to present a new experimental procedure to evaluate yarn characteristics, in real time, using capacitive sensors with a width below 8 mm (commercial equipments use 8 mm sensors). The new approach allows a direct measurement in 1 mm range (increasing resolution eight times). Using software modu…
Methyl methacrylate/1,2-divinylbenzene (MMA/DVB) in an opaque emulsion were successfully grafted onto the surface of polymeric substrate under the irradiation of UV light with benzophenone (BP) as a photoinitiator that was previously coated on the substrate surface. Monomer conversion, grafting efficiency, and graftin…
A solute atmosphere forms around a dislocation at temperatures where the diffusion of solute atoms is comparable to or faster than the dislocation motion. The dynamic interactions between diffusive solutes and moving dislocations were studied using a phase-field model which takes into account both the chemical interac…
The effect of an applied electric field on the mobilities of carboxyl-terminated dendrimers has been measured by capillary electrophoresis at applied voltages V ranging from 5 to 30 kV. The mobility increased with the field strength at moderate ionic strength, but varied inversely with V at low ionic strength. These r…
We study shear flow in liquid crystal cells with elastic deformations using a lattice Boltzmann scheme that solves the full, three-dimensional Beris-Edwards equations of hydrodynamics. We consider first twisted and hybrid aligned nematic cells, in which the deformation is imposed by conflicting anchoring at the bounda…
Abstract Poly(butylene terephthalate) (PBT)/polycarbonate (PC) samples, prepared via reactive blending in the presence of Ti‐ and Sm‐based catalysts, resulted in block copolymers whose block length decreased as the mixing time increased. A single homogeneous amorphous phase occurred when the blocks had monomeric seque…
This article presents the investigation results on the transformation characteristics of a sputter-deposited Ti–Ni–Cu shape memory alloy thin film and its relation to the substrate-induced stress. Experimental results show that, with the substrate attachment, the transformation interval increases while the transformat…
Excitation dynamics in Er3+–Yb3+ co-doped phosphate glasses were examined as a function of both erbium and ytterbium concentration by monitoring fluorescence on the 1.5 μm I13/24→I15/24 transition of Er3+ following pulsed laser excitation of the system at 977 nm under room temperature. For the range of donor (Yb3+) an…
We report the size effect on the magnetic properties in Prussian blue nanowire arrays. Samples with diameters in the range of 50–200 nm have been prepared by an electrodeposition technology with two-step anodizing anodic aluminum oxide films. The Mössbauer measurement results show that the composition of the continuou…
We discuss the influence of mobile ions in liquid crystalline materials on the dc voltage-induced molecular reorientation dynamics. We investigate the conventional case of an undoped planar nematic sample aligned by thin polymeric films deposited on the electrodes. A simple model for the ion drift towards the electrod…
We present x-ray absorption and x-ray magnetic circular dichroism studies of iron oxide passivated iron nanoparticles. The combination of measurements with different probing depths allows us to determine the oxide composition while the magnetic data reveal the magnetic interactions across the interface between the α-F…
Artificial superlattices consisting of ferroelectric BaTiO3 (BTO) and conductive LaNiO3 (LNO) sublayers were epitaxially grown on Nb-doped SrTiO3(001) single crystal substrates by a dual-gun rf magnetron sputtering system. A symmetric sublayer structure with the designed thickness varying in the range from 3 nm to 70…
The functional properties of two types of barium strontium titanate (BST) thin film capacitor structures were studied: one set of structures was made using pulsed-laser deposition (PLD) and the other using chemical solution deposition. While initial observations on PLD films looking at the behavior of Tm (the temperat…
Lanthanum-doped lead zirconate titanate stannate antiferroelectric thin films of ∼420 nm with compositions in the antiferroelectric tetragonal region have been prepared on Pt-buffered Si substrates by pulsed laser deposition. Effects of oxygen pressure during deposition were studied, with emphasis placed on the electr…