Materials Literature
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A free-electron like band has recently been observed in a monolayer of PTCDA (3,4,9,10-perylene tetracarboxylic dianhydride) molecules on Ag(111) by two-photon photoemission [Schwalb et al., Phys. Rev. Lett. 101, 146801 (2008)] and scanning tunneling spectroscopy [Temirov et al., Nature 444, 350 (2006)]. Using density…
The effects of entanglement and chain orientation on strain hardening in glassy polymers are separated by examining mixtures of chains with different lengths. Simulations show that the orientation of a molecule of a given chain length is the same in monodisperse systems and bidisperse mixtures, even when entangled and…
We report here a synthetic route for high-quality Mn-doped ZnSe nanocrystals using selenourea as a selenium source, avoiding the more conventional route using tributylphosphine (TBP) that restricts the growth of spherical ZnSe nanocrystals below 5 nm in size, besides being highly toxic and pyrophoric. Spherical ZnSe n…
We investigated the hypoglycemic and hypolipidemic effects of two hesperertin glycosides, namely, hesperidin and cyclodextrin (CD)-clathrated hesperetin, in Goto-Kakizaki (GK) weanling rats with type 2 diabetes. We demonstrated that hesperidin and CD-hesperetin normalized glucose metabolism by altering the activities…
The reaction of Ln(NO(3))(3).6H(2)O (Ln = Gd, Dy) with triethanolamine (teaH(3)) and triethylamine in MeOH gives two isostructural hexanuclear wheels of formula [Ln(6)(teaH)(6)(NO(3))(6)].8MeOH, the magnetic properties of which show slow magnetisation relaxation in the Dy case.
Palladium nanoparticles have been dispersed uniformly throughout a microporous poly(aryleneethynylene) material by the infusion of a CO 2 -soluble Pd precursor. The resulting composite has good thermal stability and has potential applications for example in heterogeneous catalysis. The porosity of the polymeric suppor…
A new alkaline transition-metal borohydride, NaSc(BH 4 ) 4, is presented. The compound has been studied using a combination of in situ synchrotron radiation powder X-ray diffraction, thermal analysis, and vibrational and NMR spectroscopy. NaSc(BH 4 ) 4 forms at ambient conditions in ball-milled mixtures of sodium boro…
Near-infrared-to-visible up-conversion of light by rare earth ion-doped nanophosphors (NaYF 4:Yb 3+,Er 3+ ) opens new possibilities for improved biolabeling. A major obstacle to applications of up-converting nano phosphors (UCNPs) has been obtaining samples stable in serum media for biological applications. Previous r…
${\text{LaAlO}}_{3}/{\text{SrTiO}}_{3}$ interfaces grown by molecular beam epitaxy show a metal-insulator transition at a critical film thickness of four unit cells of ${\text{LaAlO}}_{3}$ on ${\text{TiO}}_{2}$-terminated ${\text{SrTiO}}_{3}$ substrates. This transition had previously been observed in ${\text{LaAlO}}_…
Trapping of hot electron behavior by trap centers located in buffer layer of a wurtzite phase GaN MESFET has been simulated using an ensemble Monte Carlo simulation. The results of the simulation show that the trap centers are responsible for current collapse in GaN MESFET at low temperatures. These electrical traps d…
Polarons - electrons coupled with lattice vibrations - play a key role in the transport and optical properties of many systems of reduced dimension and dimensionality. Their confinement affects drastically the phonon, polaron, bipolaron and multi-polaron properties of quantum wells. Here we calculate the energy spectr…
Pariser-Parr-Pople (P-P-P) model Hamiltonian has been used extensively over the years to perform calculations of electronic structure and optical properties of $π$-conjugated systems successfully. In spite of tremendous successes of \emph{ab initio} theory of electronic structure of large systems, the P-P-P model cont…
We present an investigation of the atomic and electronic structure of graphene monolayer islands on the $6H\text{-SiC}(000\overline{1})(3\ifmmode\times\else\texttimes\fi{}3)[\text{SiC}(3\ifmmode\times\else\texttimes\fi{}3)]$ surface reconstruction using scanning tunneling microscopy (STM) and spectroscopy (STS). The o…
On the basis of local nonequilibrium approach, the one-dimensional model of the solute diffusion during rapid solidification of the binary alloy in the semi-infinite volume is considered. Within the scope of the model it is supposed that mass transport is described by the telegrapher equation. The basic assumption con…
The rotationally-covariant renormalization group equations of motion for the density wave amplitudes in the phase field crystal model are shown to follow from a dynamical equation driven by an effective free energy density that we derive. We show that this free energy can be written purely as a function of the strain…
We study the effects of next-nearest neighbor (NNN) interaction on the dynamic phase transition (DPT) and hysteresis loop area law in the two-dimensional ferromagnetic kinetic Ising model. We find that inclusion of the NNN interaction causes the DPT boundary of the NN kinetic Ising model to shift to larger values of m…
Thermally stimulated diffusion of Mn across the (Ga,Mn)As/GaAs interface has been studied by X-ray photoemission. Ga(0.95)Mn(0.05)As layers were capped with GaAs of different thickness 4, 6 and 8ML, and Mn diffusing through the GaAs layers was trapped on the surface by means of amorphous As covering the surface. It wa…
In situ APPES technique demonstrates that the strong metal support interaction effect (SMSI) in the Ni-ceria system is associated with the decoration and burial of metallic particles by the partially reduced support, a phenomenon reversible by evacuation at high temperature of the previously absorbed hydrogen.
Solution phase triangular silver nanoplates (TSNP) with versatile tunability throughout the visible-NIR wavelengths are presented as highly sensitive localized surface plasmon refractive index sensors. A range of 20 TSNP solutions with edge lengths ranging from 11 to 200 nm and aspect ratios from 2 to 13 have been stu…
We report that gold thermally deposited onto n-layer graphenes interacts differently with these substrates depending on the number layer, indicating the different surface properties of graphenes. This results in thickness-dependent morphologies of gold on n-layer graphenes, which can be used to identify and distinguis…