Materials Literature
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The magnetoresistance (MR) of Ni2Mn1+xSn1−x (0.40≤x≤0.52) is studied as functions of temperature and magnetic field in austenitic and martensitic phases. The maximum MR obtained is −36% (x=0.4) at 170 K with 7 T magnetic field during martensitic transition. The MR in the martensitic phase (maximum −2.2%) is less than…
Nanomaterials and -structures have attracted much attention owing to their applications to ultrasensitive nanodevices. In this work, ordered assembly arrays of ZnO nanorods have been hydrothermally fabricated and used as optical substrates of fluorescence sensors for toxic vapors. The unique fastigiate nanorod assembl…
We study the magnetic susceptibility of mixed-valent La${}_{2\ensuremath{-}x}$Sr${}_{x}$CoO${}_{4}$ single crystals in the doping range of $0.5\ensuremath{\leqslant}x\ensuremath{\leqslant}0.8$ for temperatures up to 1000 K. The magnetism below room temperature is described by paramagnetic Co${}^{2+}$ in the high-spin…
Abstract A postmodification method for polyurea microcapsule (PUMC) surfaces using functional polyelectrolytes is reported in this article. Fluorescein isothiocyanate (FITC) was used to probe the chemistry on PUMC surface and label nucleophilic groups on the surface, in particular amines. As well, a fluorescently labe…
Photosynthesis versus irradiance curves and their associated photosynthetic parameters from different phototrophic biofilms isolated from an extreme acidic environment (Río Tinto, SW, Spain) were studied in order to relate them to their species composition and the physicochemical characteristics of their respective sa…
Highly crystalline quality c-axis epitaxial nLaFeO3–Bi4Ti3O12 (n=0.5,1.0,1.5) thin films were deposited on SrTiO3 (001) substrates by pulsed laser deposition. The x-ray diffraction and transmission electron microscopy characterizations confirm that there are designed even-odd number perovskite-block structures in n=0.…
Using configuration-state-constrained electronic structure calculations based on the generalized gradient approximation plus Hubbard $U$ method, we sought the origin of the giant tetragonal ferroelectric distortion in the ambient phase of the potentially multiferroic material BiCoO${}_{3}$ and identified the nature of…
Molecular dynamics (MD) calculations were used to examine shock wave propagation along [100], [111], and [110] directions in aluminum single crystals. Four different embedded-atom method (EAM) potentials were used to obtain wave profiles in ideal (defect-free) crystals shocked to peak longitudinal stresses approaching…
A method is reported to generate mesoporous titania thin films with large pores and large surface areas by adding poly(propylene glycol), PPG, to the coating sol of films prepared by templating with Pluronic surfactant P123. Because P123 has an average structure (PEO) 20 (PPO) 70 (PEO) 20 where PEO is a poly(ethylene…
Ferrimagnetic Mn3−xCoxGa compounds have been investigated by magnetic circular dichroism in x-ray absorption (XMCD). Compounds with x>0.5 crystallize in the CuHg2Ti structure. A tetragonal distortion of the cubic structure occurs for x≤0.5. For the cubic phase, magnetometry reveals a linearly increasing magneti…
A strategy for the stepwise annulation of pyrrolic rings of a porphyrin to imidazole rings is presented. Mono(imidazole), Janus and corner bis(imidazole), T-shaped tris(imidazole), and tetrakis(imidazole) porphyrins have been synthesized and characterized.
Ultrafast dynamics of surface-enhanced Raman scattering (SERS) was investigated at cleaved graphite surfaces bearing deposited gold (Au) nanostructures (∼10 nm in diameter) by using sensitive pump-probe reflectivity spectroscopy with ultrashort (7.5 fs) laser pulses. We observed enhancement of phonon amplitudes (C═C s…
Achieving a high growth rate is paramount for making large-area transparent conducting oxide coatings at a low cost. Unfortunately, the quality of thin films grown by most techniques degrades as the growth rate increases. Filtered dc cathodic arc is a lesser known technique which produces a stream of highly ionized pl…
Abstract In Algeria, a significant quantities of olive husk are rejected to nature causing by the way major nuisances to environment, to give us a reason for which our work is focused on the valorization of this waste by its incorporation in a polypropylene matrix. The hydrophilic nature of natural fibers affects nega…
Exchange of water molecules between the frequency-shifted inner-sphere of a paramagnetic lanthanide ion and aqueous solvent can shorten the T(2) of bulk water protons. The magnitude of the line-broadening T(2) exchange (T(2exch)) is determined by the lanthanide concentration, the chemical shift of the exchanging water…
In this work, we investigated the phase transformation of γ-Al 2 O 3 to θ-Al 2 O 3 by ethanol TPD and XRD. Ethanol TPD showed remarkable sensitivity toward the surface structures of the aluminas studied. Maximum desorption rates for the primary product of ethanol adsorption, ethylene, were observed at 225, 245, and 32…
We report on epitaxial graphene on silicon carbide at high current densities. We observe two distinguished regimes, and a final breakdown. First for low current densities the conductance is enhanced due to desorption of adsorbates. Second with increasing bias the sample locally starts to glow and is strongly heated. T…
Wenn's heiß wird, halten sie nicht zusammen: Wiederverwendbarkeit ist essenziell für ionische Flüssigkeiten, die zur Prozessierung von Holz-Biomasse genutzt werden sollen. „Destillierbare“ geschmolzene Säure-Base-Konjugate lösen Cellulose bei 100 °C effizient auf. Eine weitere Temperaturerhöhung verschiebt das Säure-B…
Injection-molded semicrystalline polymer parts generally exhibited a so-called skin-core structure basically as a result of the large gradients of temperature, shear rate, stress, and pressure fields created by the boundary conditions of injection molding. Suppression of the skin-core structure is a long-term practica…
Adsorption of bovine serum albumin (BSA) and fibrinogen (Fg) was measured on six distinct bare and dextran- and hyaluronate-modified silicon surfaces created using two dextran grafting densities and three hyaluronic acid (HA) sodium salts derived from human umbilical cord, rooster comb and Streptococcus zooepidemicus.…