Materials Literature
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We report a study of the nanoscale mass-density fluctuations of heterogeneous optical dielectric media, including nanomaterials and biological cells, by quantifying their nanoscale light-localization properties. Transmission electron microscope images of the media are used to construct corresponding effective disorder…
We describe the cross-linking of poly(4-styrene-sulfonic acid) (PSS) by exposure to ultraviolet (UV) light (λ = 255 nm) under a vacuum. Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) showed that the photo-crosslinking of PSS resulted from coupling between radicals that were…
A new functional polysilsesquioxanes linkage (abbreviated as VPBA-Si) is achieved through the hydrogen transfer nucleophilic addition reaction between 4-vinylphenylboronic acid and 3-(triethoxysilyl)-propylisocyanate (TEPIC). Three kinds of rare earth (Eu3+, Tb3+) centred hybrid materials are assembled with VPBA-Si an…
Superlatticelike (SLL) dielectric comprising of Ge2Sb2Te5 and SiO2 was employed to reduce the power and increase the speed of phase-change random access memories (PCRAMs). In this study, we found that PCRAM cells with SLL dielectric require lower currents and shorter pulse-widths to switch compared to the cells with S…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation H. Y. Kuo, Y. C. Shu, H. Z. Chen, C. J. Hsueh, C. H. Wang, Y. H. Chu; Domain pattern and piezoele…
Using first-principles calculations, we investigate the structural, electronic, and magnetic properties of the designed double-perovskite-oxide ${\text{Ho}}_{2}{\text{MnFeO}}_{6}$ within generalized gradient approximation (GGA) and the $\text{GGA}+U$ methods. The calculations on electronic structure indicate the mater…
ZnO nanocrystals with strong blue emission have been synthesized via a facile polyol hydrolysis route. The as-synthesized ZnO nanocrystals were stable in water, even at basic or acidic aqueous conditions. The water stability of such ZnO nanocrystals was provided by the hydroxyl groups of triethylene glycol (TREG) and…
Six TiO₂ and two CeO₂ nanomaterials with dry sizes ranging from 6-410 nm were tested for their ability to cause DNA centered free radicals in vitro in the concentration range of 10-3,000 ug/ml. All eight of the nanomaterials significantly increased the adduction of the spin trap agent 5,5-dimethyl-1-pyroline N-oxide (…
We reformulate the problem of a steerable left-handed antenna reported by Matsuzawa et al. [IEICE Trans. Electron. E89-C, 1337 (2006)] from the view point of structural electromagnetic resonance of the unit structure. We show that there are two such resonances with different spatial symmetries in the relevant frequenc…
Type-II heterostructure nanorods hold good prospects for efficient charge separation in nano solar cells. Here we employed local density approximation (LDA) quality plane wave pseudopotential methods to study exciton dissociation in CdSe/CdTe collinear nanorods. We corrected the LDA band gap by approximating GW equati…
Structural and magnetic properties of 3d transition-metal-doped silicon carbide in cubic (3 C ) polytype have been systematically studied from first principles to reconcile conflicting experimental findings. The most energetically favorable structures fall in two distinct sets depending on the character of the 3d tran…
We report the synthesis of well-dispersed core-shell Au@SiO(2) nanoparticles with minimal extraneous silica particle growth. Agglomeration was suppressed through consecutive exchange of the stabilizing ligands on the gold cores from citrate to L-arginine and finally (3-mercaptopropyl)triethoxysilane. The result was a…
We consider quantum pumping of Dirac fermions in a monolayer of graphene in the presence of a perpendicular magnetic field in the central pumping region. The two external pump parameters are electrical voltages applied to the graphene sheet on either side of the pumping region. We analyze this pump within scattering m…
For bioassessment of freshwaters, diatom indices have been mainly used in streams although their applicability in shallow lakes has been demonstrated in several studies. However, the influence of sampling substrata on periphytic diatom communities and on the ecological quality inferred from them has been paid little a…
Silica nanosprings with large surface-to-volume ratios were coated with noble metal nanoparticles (NPs) using chemical vapor deposition or chemisorption of presynthesized or in situ synthesized nanoparticles. Chemisorption of presynthesized silver NPs onto amine-functionalized silica NS results in particularly interes…
Abstract The very high temperature gas-cooled reactor (VHTR), with dual capacities of highly efficient electricity generation and thermochemical production of hydrogen, is considered as one of the most promising Gen-IV nuclear systems. The primary candidate materials for construction of the intermediate heat exchanger…
Six lanthanide(III) coordination polymers with the formulae {[Ln(Hpdtc)(H2O)3]·H2O}n [Ln = La (1), Ce (2), Pr (3)], {[Ln(Hpdtc)(H2O)2]·2H2O}n [Ln = Eu (4), Tb (5)] and {SmK(pdtc)(H2O)4}n (6) (H4pdtc = pyridine-2,3,5,6-tetracarboxylic acid) have been synthesized by reacting the corresponding rare earth salts or oxides…
We apply state of the art electronic structure techniques, based on hybrid exchange-functionals in DFT and periodic boundary conditions, to unravel the reaction mechanism responsible for the initial stages of the aerobic oxidation of hydrocarbons catalyzed by Mn-doped aluminophosphates. In this preactivation step of t…
We have developed colloidal synthesis methods to create nanoparticles (NPs) of tantalum nitride. The particle sizes and crystallinity can be controlled through the use of different organic solvents and reaction times; we demonstrate here NPs ranging in size from 2 to 23 nm. While electron microscopy and selected area…
The electronic structure and transport property of a carbon chain between two graphene nanoribbon leads are studied using an ab initio tight-binding (TB) model and Landauer's formalism combined with a non-equilibrium Green's function. The TB Hamiltonian and overlap matrices are extracted from first-principles density…