Materials Literature
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Superlinear-variation in short circuit photocurrent with increasing incident optical power has been observed in metal-insulator-semiconductor structures having a silicon rich oxinitride active layer containing silicon nanocrystals. A model has been elaborated where an internal gain mechanism explains the superlinear p…
The biomimetic formed solution of collagen reconstituted films into native fibers proved to be of high interest because of its regenerative medical applications. A variety of tests to characterize the mechanical properties of biomimetic engineered films are illustrated in this paper. Based on our previous results, the…
We investigate the behavior of liquid crystal dynamic flow in a cell with a bidirectional alignment (BDA) surface. Numerical simulations show that with a BDA surface having a pitch comparable to the cell gap d, the liquid crystal dynamic flow direction can be controlled by the driving voltage. Such an effect can be ap…
Abstract In this work, in situ investigations of the micromechanical properties of reactively compatibilized blends of polyamide 6 (PA6) and an acrylonitrile–butadiene–styrene copolymer (ABS) were performed with transmission electron microscopy. Three PA6/ABS blends were prepared with a disperse morphology (inclusions…
Abstract The filling of porous silicon with polypyrrole by electropolymerization was investigated. The filling with polypyrrole proceeded preferentially along the porous silicon wall, leading to the formation of tubular structures. By repeating the porosification, the pore filling and the additional porosification, th…
The purpose of this study is to consider the effect of polydispersity in triblock copolymer on its order-to-disorder phase transition and morphology, by supplementing continuous description of polymer indices carried out using random phase approximation by a discrete sampling of the polydispersity performed at the mes…
Abstract Two novel poly(amine‐hydrazide)s were prepared from the polycondensation reactions of the dicarboxylic acid, 9‐[ N , N ‐di(4‐carboxyphenyl)amino]anthracene ( 1 ), with terephthalic dihydrazide ( TPH ) and isophthalic dihydrazide ( IPH ) via the Yamazaki phosphorylation reaction, respectively. The poly(amine‐h…
The growth of Fe-Ni based amorphous nanocolumns has been studied using atomic force microscopy. The root mean square roughness of the film surface increased with the deposition time but showed a little change at higher deposition time. It was found that the separation between the nanostructures increased sharply during…
High refrigerant capacity of PrNi5−xCox magnetic compounds exploiting its spin reorientation and magnetic transition over a wide temperature zone, Rocco, D L, Amaral, J S, Leitão, J V, Amaral, V S, Reis, M S, Das, Soma, Fernandes, R P, Araújo, J P, Pereira, A M, Tavares, P B, Martins, Nuno V, Coelho, A A
Formation of biopolymer-stabilized nanosuspensions followed by dextranase enzyme treatment is demonstrated for the liberation of monodisperse particles of controllable size up to 6 nm (see image). A range of metal oxide nanoparticles stabilized by remnant oligomer at ≈3 wt% are reliably prepared for applications that…
We have investigated structural, magnetic, and transport properties of $\text{Fe}{({\text{Sb}}_{1\ensuremath{-}x}{\text{Te}}_{x})}_{2}$ single crystals. Whereas metallic ground state is induced for $x=0.001$, canted antiferromagnetism is observed for $0.1\ensuremath{\le}x\ensuremath{\le}0.4$ with an intermediate ferro…
Abstract In this study, the effects of different parameters on the morphological properties of ternary blends were investigated. Therefore two systems (PET/H‐EVA/PP and PET/ L ‐EVA/PP, H‐EVA and L ‐EVA are high and low viscosity, respectively) were prepared by melt mixing process. In all of the blends, poly (ethylene…
Four inner tetrathiafulvalene-sulfoxides have been synthesized upon reaction of tetrathiafulvalene (TTF), tetramethyl-tetrathiafulvalene (TMTTF), tetrakis (thiomethyl)-tetrathiafulvalene (TMT-TTF), and bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) with enantiopure (+) or (-)-(8,8-dichlorocamphorylsulfonyl)-oxaziri…
The persistent field effect control of ferromagnetism in a diluted magnetic semiconductor by low-voltage polarizing pulses is demonstrated in a ferroelectric gate field effect transistor configuration. The Curie temperature of the (Ga,Mn)As channel is unambiguously signaled by a cusp in the temperature derivative of r…
The Raman signal can be strongly increased for molecules deposited on a thin metal film in a configuration where the emission of the Raman signal into a glass support of the film is mediated by leaky surface plasmons (SPs). Here we show that SP provides an efficient pathway to detect tip enhanced Raman scattering (TER…
We report muon-spin relaxation measurements on SrFeAsF, which is the parent compound of an iron-arsenic- fluoride based series of superconducting materials. We find that this material has very similar magnetic properties to LaFeAsO, such as separated magnetic and structural transitions $({T}_{\text{N}}=122\text{ }\tex…
Effects of K nonstoichiometry and Li addition on piezoelectric and dielectric properties of (Bi0.5K0.5+xLiy)TiO3 ceramics were studied in the range of x=−8–1 and y=0–5 mol % from the stoichiometric K0.5. A tetragonal perovskite structure was maintained at all compositions despite the formation of secondary phases with…
Saturation magnetostriction measurements along the [100] axis of Fe100−xGax single crystal rods (∼25×6mm diameter) were observed to have a linear dependence on [100] applied compressive stresses for 20<x<30. This is not expected from linear magnetoelastic theory and indeed is negligible for x=19.5. An ex…
Chemical bonding to oxide surfaces is often dominated by surface defects, but their nature remains elusive. Calorimetric measurements of Ca and Li adsorption energies on MgO(100) and ion-damaged MgO(100), when combined with density functional theory (DFT) calculations and kinetic modeling, are shown to be a powerful w…
Magnetite hollow spheres with a diameter of 650 nm and shell thickness of 40 nm exhibit an unexpected green color, in contrast with usual magnetite solids appearing black. This unusual green color is interpreted in terms of the Mie scattering on the inhomogeneous and low-density structure of the hollow spheres with a…