Materials Literature
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Linear- and parallel-aligned gold nanorods (GNRs) were self-assembled on glass substrates and their surface-enhanced Raman scattering effect was investigated. GNRs were prepared by seed-mediated growth method and self-assembled to form linear and parallel aggregation on the substrate. The parallel-aligned GNRs showed…
No need for a solid template: Hollow gold spheres (see TEM image) have been realized through a microemulsion approach. The spheres have a wall thickness of 2–6 nm and an inner diameter of 20–40 nm.
Abstract Using a simple ligand design, we have prepared neutral, nine‐coordinate lanthanide complexes that exclude water from the inner coordination sphere, thus leading to high emission quantum yields and long excited‐state lifetimes. The complexes form in high synthetic yields (49–87 %) by simply mixing the ligand a…
The utilization of electrospun biodegradable scaffolds by fine-tuning their biofunctionalities through a simple mixing method was demonstrated in this study. Poly(L-lactide) (PLLA)-based scaffolds containing small amounts of bioactive collagen type I molecules were investigated for enhancements in cellular behavior. E…
Led to the bioscaffold: A method is developed to coat intricate biosilica structures with functional oxides. Thin coatings of SnO2 are applied to the silica valves of diatoms (see picture) through dendritic amplification of surface hydroxy groups and subsequent sol–gel processing. The SnO2-coated valves act as sensiti…
Abstract A novel method for preparing rigid polyurethane (PU) foam/organoclay nanocomposites was developed through the direct incorporation of an organoclay into PU foam matrices without the addition of any physical or chemical blowing agent. The resultant foams with an appropriate content of the organoclay had a fine…
The Diatom Index for Australian Rivers (DIAR), originally developed at the genus level, was reformulated at the species level with data from diatom sampling of rivers in the Australian Capital Territory, New South Wales, Queensland, South Australia and Victoria. The resulting Diatom Species Index for Australian Rivers…
Porous lead zirconate titanate–lead zinc niobate (PZT–PZN) piezoelectric ceramics with interconnected pore channels were fabricated using the camphene‐based freeze‐casting method. In this method, warm PZT–PZN/camphene slurries with various solid loadings (10, 15, 20, and 25 vol%) were prepared by ball milling at 60°C…
Highly conducting and porous carbon nanotube (CNT) networks are used as the sole electron conducting material in supercapacitors. The high conductivity of CNT networks and the high surface area allow the replacement of both the metallic current collector and the active material that forms one side of the electrochemic…
The multi phonon Raman scattering in Mn doped (1%–10%) ZnO was observed at room temperature using 514.5nm Ar+ laser. The additional optical modes at 327, 332, 482, 532, and 680cm−1 in Zn1−xMnxO targets were identified as the second order Raman modes in the disordered lattice and the precipitation of the secondary phas…
The dynamics of driven domain walls (DWs) is studied in disordered uniaxial ferroic materials such as periodically poled ferroelectric KTiOPO 4 ; quantum ferroelectric SrTi 18 O 3 ; relaxor ferroelectric Sr 0.61 Ba 0.39 Nb 2 O 6 (SBN); ultrathin ferromagnetic multilayers Pt/Co/Pt; and discontinuous magnetic metal-insu…
The characteristics of bismuth-doped glasses were investigated as colorless ultrabroadband near-infrared gain media. The colorless Bi-doped soda-lime-silicate glass was prepared under controlled redox conditions, and it realized the broadest near-infrared emission of about 600nm in full width at half maximum, centered…
Micro-Raman studies show that under ∼700kV∕cm of dc voltage stressing for a few seconds, magnetite Fe3O4 forms in thin-film bismuth ferrite BiFeO3, probably due to phase separation. No evidence is found spectroscopically of hemite α-Fe2O3, maghemite γ-Fe2O3, or Bi2O3. This may relate to the controversy regarding the m…
Negative index-of-refraction materials (NIMs) require both the electric permittivity and the magnetic permeability of the material to be negative. Most reported NIMs have combined conducting split ring resonators (SRRs) to realize the magnetic response and nonresonant wires to realize the electric response. Here, howe…
In a recent paper, Segal et al. [Phys. Rev. B 71, 245201 (2005)] advanced a new explanation for the dynamics of spin-$\frac{1}{2}$ photoluminescence-detected magnetic resonance (PLDMR) in films of a $\ensuremath{\pi}$-conjugated polymer, namely, a soluble derivative of poly(phenylene-vinylene) (MEH-PPV), using a model…
The characterization of microstructures in three dimensions is reviewed, with an emphasis on the use of automated electron back-scatter diffraction techniques. Both statistical reconstruction of polycrystalline structures from multiple cross sections and reconstruction from parallel, serial sections are discussed. In…
The α-Ca2P2O7:Eu2+, Mn2+ phosphors show two emission bands peaking at around 416 (blue) and 600nm (orange), originating from the allowed f-d transition of Eu2+ and the forbidden T14-A16 transition of Mn2+, respectively, under near ultraviolet (UV) excitation at 400nm. Spectroscopy and fluorescence lifetime measurement…
Unexpected structural complexity: Well-crystallized Mg(BH4)2 powder is obtained, allowing the structure to be determined from synchrotron X-ray and neutron diffraction data. Mg(BH4)2 is a novel and remarkably complex three-dimensional framework in which each Mg2+ ion (blue) is tetrahedrally coordinated by four [BH4]−…
Perturbation of a propagating crack with a straight edge is solved using the method of matched asymptotic expansions (MAE). This provides a simplified analysis in which the inner and outer solutions are governed by distinct mechanics. The inner solution contains the explicit perturbation and is governed by a quasi-sta…
The Gd2Sn2O7 pyrochlore Heisenberg antiferromagnet displays a phase transition to a four sublattice Neel ordered state at a temperature near 1 K. Despite the seemingly conventional nature of the ordered state, the specific heat has been found to be described in the temperature range 350-800 mK by an anomalous T-square…