Materials Literature
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We investigate the quasiparticle relaxation and low-energy electronic structure in undoped ${\text{SrFe}}_{2}{\text{As}}_{2}$ exhibiting spin-density wave (SDW) ordering using optical pump-probe femtosecond spectroscopy. A remarkable critical slowing down of the quasiparticle relaxation dynamics at the SDW transition…
The paper reports the viscous creep occurring in vertically aligned carbon nanotubes (VA-CNTs). Nanoindentation experiments are conducted to characterize the creep behaviour of the nanotube materials. By recording the instantaneous control stress and strain rate, the creep strain rate sensitivity of the VA-CNT array i…
We report inelastic neutron scattering measurements that provide a distinct dynamical ``fingerprint'' for the multiferroic ground state of 3.5% Ga-doped ${\text{CuFeO}}_{2}$. The complex ground state is stabilized by the displacement of the oxygen atoms, which contribute to the multiferroic coupling predicted in the `…
We study from first principles the optical properties of the phase change materials Ge(2)Sb(2)Te(5) (GST), GeTe and Sb(2)Te(3) in the crystalline phase and in realistic models of the amorphous phase generated by quenching from the melt in ab initio molecular dynamics simulations. The calculations reproduce the strong…
The adsorption energies of simple atomic adsorbates are coverage dependent. We use density-functional theory to show that the coverage dependence is due to an adsorbate-induced modification of the surface $d$-band structure. We developed a simple model for predicting the $d$-band widths of clean and adsorbate-covered…
Domen has observed that the GaN/ZnO semiconductor alloy serves, in the presence of a sacrificial electron scavenger, as a photocatalyst for solar water oxidation, producing H + and O 2 at the aqueous/semiconductor interface. With a suitable cocatalyst, the same solar photoexcitation process also generates H 2 from H +…
Using first-principles calculations, the structural, mechanical and electronic properties of the experimentally synthesized B(12)-based ternary crystals (AlMgB(14), AlNaB(14), AlLiB(14), Mg(2)B(14), MgSi(2)B(12), MgC(2)B(12), Li(2)Si(2)B(12) and Li(2)C(2)B(12)) have been investigated. The theoretical equilibrium latti…
Ce−Zr mixed oxides with a targeted composition of Ce 0.76 Zr 0.24 O 2 have been synthesized from nitrate precursors following different synthesis methods: coprecipitation, solid combustion synthesis with urea, citrate complexation, reverse microemulsion, and synthesis with an activated carbon fiber template. Though th…
In recent years, there has been an explosion of research in the 'bio-nano' field, with the discovery and introduction of ever more fascinating materials for applications as drug delivery systems, sensors, transducers, and so on. The author's group, for the first time in the literature, proposed boron nitride nanotubes…
Glibenclamide (GCM) is an oral hypoglycemic agent of the sulfonylurea group used in the treatment of non-insulin-dependent diabetes. Crystalline GCM is characterized by low bioavailability, which is attributed to its poor dissolution properties. It prompted us to prepare this drug in its amorphous form as a means to e…
Stoichiometric epitaxial LaAlO(3) grown on TiO(2)-terminated SrTiO(3)(001) by off-axis pulsed laser deposition is shown to exhibit strong cation intermixing. This result is corroborated by classical and quantum mechanical calculations of the relative stabilities of abrupt and intermixed interface configurations. The v…
We have examined the impact of charged impurity scattering on charge carrier transport in bilayer graphene (BLG) by deposition of potassium in ultrahigh vacuum at low temperature. Charged impurity scattering gives a conductivity which is supralinear in carrier density with a magnitude similar to single-layer graphene…
RATIONALE: Although inhalation of zinc oxide (ZnO) nanoparticles (NPs) is known to cause systemic disease (i.e., metal fume fever), little is known about mechanisms underlying injury to alveolar epithelium. OBJECTIVES: Investigate ZnO NP-induced injury to alveolar epithelium by exposing primary cultured rat alveolar e…
Improved routes for the preparation of nanoparticles, in conjunction with the development of more sophisticated structural probes for nanostructured materials, allows questions to be addressed regarding fundamental size limits on material properties. The property addressed here is structural off-centering, the molecul…
We present measurements of transmission and reflection spectra of a microwave photonic crystal composed of 874 metallic cylinders arranged in a triangular lattice. The spectra show clear evidence of a Dirac point, a characteristic of a spectrum of relativistic massless fermions. In fact, Dirac points are a peculiar pr…
We present a fresh appraisal of the Cole-Cole (CC) description of dielectric relaxation. While the approach is phenomenological, it demonstrates a fundamental connection between the parameters of the CC dispersion. Based on the fractal nature of the time set representing the interaction of the relaxing dipole with its…
The lanthanum (La) modification is known to improve dielectric and magnetic properties of ${\text{BiFeO}}_{3}$ (BFO), a promising room-temperature multiferroic oxide. The effects of La doping on the variations of the off-centering distortion and the orbital mixing of BFO are experimentally studied, in conjunction with…
We explore the spatial variations of the unoccupied electronic states of graphene epitaxially grown on Ru(0001) and observed three unexpected features: the first graphene image state is split in energy; unlike all other image states, the split state does not follow the local work function modulation, and a new interfa…
Using first-principles calculations within density functional theory, we study the relative impacts of quantum confinement and strain on the electronic structure of two II-VI semiconductor compounds with a large lattice-mismatch, CdSe and CdTe, in core/shell nanowire geometries with different core radii and shell thic…
Experimental phonon imaging in diamond anvils cell is demonstrated to be an adequate tool to extract the complete set of elastic constants of single-crystalline silicon up to the ZB$\rightarrow β-$Sn transition (10 GPa). Contrary to what was commonly admitted, we demonstrate that the development of the strain-energy d…