Materials Literature
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We show for the system La1-xCexCoO3 (0.1 <= x <= 0.4) that it is possible to synthesize electron-doped cobaltites by the growth of epitaxial thin films. For La1-xCexCoO3, ferromagnetic order is observed within the entire doping range (with the maximum of the Curie temperature, Tc, at x ca. 0.3), resulting in a magneti…
We review the progress in the spatial resolution of atomic force microscopy (AFM) in vacuum. After an introduction of the basic principle and a conceptual comparison to scanning tunneling microscopy, the main challenges of AFM and the solutions that have evolved in the first twenty years of its existence are outlined.…
Pairs of electrodes with nanometer separation (nano-gap) are achieved through an electromigration-induced break-junction (EIBJ) technique at room temperature. Lithographically defined gold (Au) wires are formed by e-beam evaporation over oxide coated silicon substrates silanized with (3-Mercaptopropyl)trimethoxysilane…
The ring-opening polymerization of rac-lactide at a beta-diketiminate magnesium center, [HC{CMeN-2,6-(i)Pr(2)C(6)H(3)}(2)]Mg(OMe)(THF), has been investigated using a B3-LYP density functional procedure employing three different layers of basis set: 6-311G(3d) at the Mg center, 6-31G(d) for both the ligand skeleton and…
Taking advantage of the stability and penetrability of layer-by-layer (LbL) films, we develop a novel method to fabricate a branchlike structure of Ag aggregates on the matrix of a LbL polyelectrolyte multilayer by an electrodeposition technique. The morphology of Ag aggregates can be adjusted by electrodeposition tim…
The mechanism of lasing in single cadmium sulfide (CdS) nanowire cavities was elucidated by temperature-dependent and time-resolved photoluminescence (PL) measurements. Temperature-dependent PL studies reveal rich spectral features and show that an exciton-exciton interaction is critical to lasing up to 75 K, while an…
Paramagnetic lanthanide complexes that display unusually slow water exchange between an inner sphere coordination site and bulk water may serve as a new class of MRI contrast agents with the use of chemical exchange saturation transfer (CEST) techniques. To aid in the design of paramagnetic CEST agents for reporting i…
The present difficulties in synthesis of one-dimensional copper are short length, nonlinear morphology, polydispersivity, poor crystallinity, low yield, and process complexity. In this work, we demonstrate that high-quality ultralong copper nanowires (90-120 nm in diameter, 40-50 microm in length; aspect ratio >350-45…
Electron transfer across the molecule-semiconductor interface is a fundamental process that is relevant to many applications of nanoparticles, such as dye-sensitized solar cells and molecular electronics. This review summarizes recent progress in understanding electron transfer dynamics from molecular adsorbates to se…
Superhydrophobic surfaces have important technical applications ranging from self-cleaning window glasses, paints, and fabrics to low-friction surfaces. The archetype superhydrophobic surface is that of the lotus leaf. When rain falls on lotus leaves, water beads up with a contact angle in the superhydrophobic range o…
A thermodynamic framework is presented for the theory of Viscoplasticity Based on Overstress (VBO) developed by Krempl and co-workers (Krempl, E., and Ho, K., 2001, in Lemaitre Handbook of Materials Behavior Models, Academic Press, New York, pp. 336–348; 2000, in Time Dependent and Nonlinear Effects in Polymers and Co…
A modified experimental apparatus with improved angular resolution and stability has been used to measure the total electron scattering cross sections for $\mathrm{S}{\mathrm{F}}_{6}$ and $\mathrm{S}{\mathrm{F}}_{5}\mathrm{C}{\mathrm{F}}_{3}$ in the energy range of $100--5000\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. A…
Simulations show that CO2 adsorbed in the groove sites of carbon nanotubes displays unique quasi-one-dimensional behavior. Clusters containing only odd numbers of molecules are formed at finite CO2 coverages and low temperatures. The molecules are orientationally ordered with respect to the nanotube groove axis and az…
This work reports on the investigation of nanosized CeO 2 -ZnO systems prepared by Pechini'smethod. The structural and morphological characterization of CeO 2 -ZnO systems as well as thecharacterization of CeO 2 and ZnO separately, showed that the employed method result in powders withspheroidal particles whose size a…
Charophytes (family Characeae) are a cohesive group within the green algae. The genus Chara is abundant and diverse in a variety of Australian habitats. Approximately 37 taxa of Chara have been described on the basis of Australian collections. The current status of charophyte taxonomy is confused. RD Wood revised Aust…
Ultrafast relaxation of photoexcitations in semiconducting single-walled carbon nanotubes ($S$-NTs) were investigated using polarized pump-probe photomodulation (with 150 fs time resolution) and cw polarized photoluminescence (PL). Both annealed and unannealed thin NT films and ${\mathrm{D}}_{2}\mathrm{O}$ solutions o…
Strong photoluminescence (PL) is observed in nanostructured crystalline tungsten oxide thin films that are prepared by thermal evaporation. Two kinds of films are investigated—one made of nanoparticles and another of nanowires. At room temperature, strong PL emissions at ultraviolet-visible and blue regions are found…
We study the pressure dependence of the melting mechanism of a surface free Lennard-Jones crystal by constant pressure Monte Carlo simulation. The difference between the overheating temperature($T_{OH}$) and the thermodynamical melting point($T_M$) increase for increasing pressure. When particles move into the repulsi…
A vast class of disordered conducting-insulating compounds close to the percolation threshold is characterized by nonuniversal values of transport critical exponent t, in disagreement with the standard theory of percolation which predicts t = 2.0 for all three dimensional systems. Various models have been proposed in…
The structure and polarization of the as-yet hypothetical Ruddlesden--Popper compound ${\mathrm{Pb}}_{2}\mathrm{Ti}{\mathrm{O}}_{4}$ are investigated within density-functional theory. Zone center phonons of the high-symmetry ${\mathrm{K}}_{2}\mathrm{Ni}{\mathrm{F}}_{4}$-type reference structure, space group I4/mmm, we…