Materials Literature
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We investigate the structure and mechanical behavior of assemblies of frictionless, nearly rigid equal-sized beads, in the quasistatic limit, by numerical simulation. Three different loading paths are explored: triaxial compression, triaxial extension and simple shear. Generalizing recent results [1], we show that the…
We report the first measurements of effects of large current densities on current-perpendicular-to-plane magnetoresistance (MR) of magnetic multilayers containing two antiferromagnetic layers separated by a non-magnetic layer. These measurements were intended to search for a recently predicted antiferromagnetic giant…
Assemblies of magnetic nanoparticles exhibit interesting physical properties arising from the competition of intraparticle dynamics and interparticle interactions. In ordered arrays of magnetic nanoparticles magnetostatic interparticle interactions introduce collective dynamics acting competitively to random anisotrop…
Based on the concept of complementary media, we propose a novel design which can enhance the electromagnetic wave scattering cross section of an object so that it looks like a scatterer bigger than the scale of the device. Such a "superscatterer" is realized by coating a negative refractive material shell on a perfect…
We use angle-resolved photoemission spectroscopy to investigate the electronic properties of the newly discovered iron-arsenic superconductor Ba_(1-x)K_(x)Fe_(2)As_(2) and nonsuperconducting BaFe_(2)As_(2). Our study indicates that the Fermi surface of the undoped, parent compound BaFe_(2)As_(2) consists of hole pocke…
Room-temperature thermoelectric properties of n-type crystalline Si with periodically arranged nanometer-sized pores are computed using a combination of classical molecular dynamics for lattice thermal conductivity and ab initio density functional theory for electrical conductivity, Seebeck coefficient, and electronic…
Based on the effective four-band model we analyze the spin response in the normal and superconducting states of the Fe-pnictide superconductors. While the normal-state spin excitations are dominated by the continuum of the interorbital antiferromagnetic fluctuations and the intraband spin-density wave fluctuations, th…
The fundamental chemical, redox, electrochemical, photoelectrochemical, optical and optoelectronic features of carbon nanotubes are surveyed with particular emphasis on the most relevant applications as electron donor/electron acceptor or as electron conductor/hole conductor materials, in solutions and in the solid st…
The transferring and identification of single- and few- layer graphene sheets from SiO 2 /Si substrates to other types of substrates is presented. Features across large areas (∼cm 2 ) having single and few-layer graphene flakes, obtained by the microcleaving of highly oriented pyrolytic graphite (HOPG), can be transfe…
Abstract Raman scattering measurements have been performed in Ga 1– x Mn x As crystals prepared by Mn ions implantation, deposition, and post‐annealing. The Raman spectrum measured from the implanted surface of the sample shows some weak phonon modes in addition to GaAs‐like phonon modes, where the GaAs‐like LO and TO…
A discrimination study of the neurotransmitters 3,4-dihydroxy-L-phenylalanine (DOPA), adrenaline, noradrenaline, tyramine and serotonin in aqueous solution utilising hydrophobic and hydrophilic yoctowells bearing oligoethylene walls is reported. The catecholamines were bound selectively to the hydrophobic yoctowells.…
Synthetic dyes have been widely used in supramolecular chemistry not only to probe fundamental chemical interactions but also as components of functional materials. Most current efforts in this regard are directed at designing new host systems for the dyes. Herein we report on the study of a versatile new organic fluo…
The coadsorption of alkalis with CO and O on Cu(111) and Ni(111) was studied by vibrational measurements. Unexpectedly, we found an enhanced alkali oxidation rate for alkali + CO compared with alkali + O. Such finding was ascribed to the short-range alkali−CO interaction which lowers the barrier for CO dissociation an…
BiFeO3 (BFO) films with and without a Bi3.5Nd0.5Ti3O12 (BNT) buffer layer were fabricated on indium tin oxide (ITO)/Si substrates using a metal organic decomposition process. X-ray diffraction measurements reveal that a BNT buffer layer can favour the growth of (1 1 0)-oriented grains in the BFO film. BFO film with a…
Stoichiometric Er silicate thin films, monosilicate (Er 2 SiO 5 ) and disilicate (Er 2 Si 2 O 7 ), have been grown on c-Si substrates by rf magnetron sputtering. The influence of annealing temperature in the range 1000–1200 °C in oxidizing ambient (O 2 ) on the structural and optical properties has been studied. In sp…
A new M3L2 homodimeric subphthalocyanine cage was self-assembled and characterised. Among the six possible diastereoisomeric metallosupramolecular capsules attainable, only one was shown to form under thermodynamic conditions. These results obtained on the basis of mass spectrometry, nuclear magnetic resonance and mol…
The current paper reports the results of a study of the simultaneous decomposition of NH 3 and toluene on sulfur tolerant nonconventional tungsten-based catalysts [tungsten carbide (WC) and tungstated zirconia (WZ)] at temperatures <750 °C in the presence of H 2, CO, CO 2, and H 2 O, such as it would be present in hot…
Far-infrared magneto-transmission spectroscopy has been used to probe 'relativistic' fermions in highly oriented pyrolytic and natural graphite. Nearly identical transmission spectra of those two materials are obtained, giving the signature of Dirac fermions via absorption lines with an energy that scales as . The Fer…
In this communication, the basic strategies to control the kinetics and transport phenomena of the crystal growth process, as well as novel methods to induce either nucleation or protein crystal growth via electrochemical processes, are reviewed. Additionally, recent advances, where low direct/alternant current or vol…
Abstract The dislocation structures induced by low‐plastic‐strain‐amplitude cyclic deformation of [111] multiple‐slip‐oriented Cu single crystals were investigated using electron channelling contrast (ECC) technique in scanning electron microscopy (SEM). At a low plastic strain amplitude γ pl of 8.8 × 10 –5 , the satu…