Materials Literature
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We study theoretically mixed solutions of homopolymer and diblock copolymer chains. The solvent is a poor solvent for the homopolymers and a selective solvent for the copolymers. We find that the formation of copolymer micelles containing also the insoluble chains allows for an increased solubility of the homopolymers…
Seventeen members of the solid solution series Ba 2 - x Sr x LuBiO 6 have been prepared, and their crystal structures were studied using a combination of powder synchrotron X-ray and neutron diffraction methods. The oxides all adopt a double perovskite-type A 2 BB‘O 6 (A = Ba, Sr; B = Lu, B‘ = Bi) structure as a conse…
Information about the metal phase in a supported-metal catalyst can be obtained using anomalous small-angle X-ray scattering (ASAXS). The difference between the scattering profiles for SAXS at two different wavelengths near the metal's absorption edge is essentially the scattering of the metal alone. Novel in situ ASA…
L 1 0 -type Co100−xPtx single crystals in a single variant state were prepared by ordering under a compressive stress in order to determine accurately the uniaxial magnetocrystalline anisotropy constant KU. Both the lattice constants a and c increase with increasing Pt concentration, whereas the axial ratio c∕a become…
Reduction of iron oxide/CeO 2 solid due to methane anaerobic combustion has been studied using in situ time-resolved synchrotron X-ray powder diffraction and mass spectrometry measurements. All the chemical reactions involved in the process have been mapped. Rietveld profile fitting analysis has given a quantitative e…
A new compact cell for in situ synchrotron X-ray diffraction studies of adsorption or catalysis reactions has been designed to enable high performance whilst minimizing difficulties in use. It includes a system for simple insertion and alignment of capillary samples and an original miniaturized furnace providing excel…
Metal foils of complex, three-dimensional topographies are prepared by electroless deposition on surfaces of micropatterned hydrogel supports (see Figure). The foils can either be freestanding or supported by a photocurable polymer. It is possible to selectively metallize different portions of the micropattern embosse…
Dielectric properties and domain structure have been measured as functions of temperature in a (001)-oriented Pb(Mg1∕3Nb2∕3)0.65Ti0.35O3 (PMNT35%) single crystal with and without a prior dc electric (E)-field poling. Without E-field poling, the dielectric loss exhibits a frequency-dependent maximum in the region of 12…
We report the effect of reversible switching between blue-green and red cathodoluminescence (CL) in poly(4,4′-diphenylene diphenylvinylene) (PDPV), mixed with the 12–60nm size ZnO:Mg nanoparticles by applying an electric field. We found that without electric field the CL emission maximum is in the blue-green region fo…
Ferromagnetic In1−xMnxAs semiconductor films (x=0.12) were grown by low-temperature molecular beam epitaxy on In1−yAlyAs–AlSb–GaAs hybrid substrates. The built-in compressive strain induced by the In1−yAlyAs buffer leads to an in-plane easy axis of magnetization. Detailed studies of magnetic anisotropy by ferromagneti…
Dimethyl gold complexes bonded to partially dehydroxylated MgO powder calcined at 673 K were synthesized by adsorption of Au(CH3)2(acac) (acac is C5H7O2) from n-pentane solution. The synthesis and subsequent decomposition of the complexes by treatment in He or H2 were characterized with diffuse reflectance Fourier tra…
The two-dimensional (2D) dilute magnetic semiconductors Cd 1 - x Mn x Se·L 0.5 (L = ethylenediamine, or en, and 1,6-hexanediamine, or hda, x = 0−0.8) were synthesized in an autoclave at 120 °C. Ab initio structure solution from X-ray powder diffraction reveals the host compound CdSe· hda 0.5 (space group, Pbca, a = 6.…
A newly developed spectroelectrochemical imaging approach for directly assessing lithium ion insertion energetics and kinetics in mixed-phase, polymorphous MoO3 is reported. Two variants of spectroelectrochemical microscopy were used to monitor insertion dynamics and to follow electrochemically induced phase transform…
Ferroelectric ceramics of Bi3.25La0.75Ti3−xNbxO12 (x=0.0,0.03) were synthesized using the solid-state reaction method. The influence of Nb doping on the P-E hysteresis and dielectric properties was investigated. The values of remanent polarization (Pr) and coercive (Ec) were 18μC∕cm2 and 140kV∕cm for Bi3.25La0.75Ti3O1…
Abstract This work reports on the elaboration and characterization of composite materials prepared by compression molding of mixtures of tin powder and a commercial grade thermosetting resin of urea‐formaldehyde filled with alpha‐cellulose in powder form. The morphology of constituents and composites has been characte…
DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de référencementde la production scientifique de l'ULB.L'interface de recherche DI-fusion permet de consulter les publications des chercheurs de l'ULB et les thèses qui y ont été défendues.
We report the fabrication of multilayer structures containing layers of PbTe quantum dots (QDs) spaced by 15–20 nm thick SiO2 layers. The QDs were grown by the laser ablation of a PbTe target using the second harmonic of Nd:YAG laser in an argon atmosphere. The SiO2 layers were fabricated by plasma chemical vapor depo…
Some resolved solid state (77)Se NMR spectra are presented in the Te(x)Se(1-x) vitreous system at ambient temperature. They exhibit three different kinds of Se lines assigned to the following Se atom neighborhoods: Se-Se-Se, Se-Se-Te, and Te-Se-Te. Different models were considered to describe the way the Se and Te ato…
We report 77Se spin-lattice relaxation rates for (TMTSF)2PF6, carried out in the regime where a set of spectacular transport anomalies known as the "magic angle effects" are observed. In situ resistance measurements (R(zz)) were used to verify the experimental conditions and give precise sample alignment information.…
Scaling relations between the superconducting transition temperature T(c), the superfluid stiffness rho(s), and the normal state conductivity sigma(0)(T(c)) are identified within the class of molecular superconductors. These new scaling properties hold as T(c) varies over 2 orders of magnitude for materials with diffe…