Materials Literature
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A simple and efficient Diels-Alder (DA) reaction on carbon material has been demonstrated. The present work involves single and multiwall carbon nanotubes (CNTs), as well as Herringbone carbon nanofiber. The CNTs show a dual nature of reactivity in DA reaction, i.e., they behave both as dienophile and diene with furfu…
The magnetic properties of magnetic materials are considerably changed near the Curie temperature. In order to analyze the magnetic characteristics of magnetic devices which operate at high temperature, such as induction heater of billets, high temperature motor, theB-Hcurves and iron loss curves are necessary for the…
Effects of environmental dielectric screening on excitons in carbon nanotubes are studied within a k · p scheme and a continuum model. They are shown to be sensitive to the effective distance between the nanotube and the dielectric medium relative to the diameter. For material surrounding the nanotube, the band gap de…
Water-soluble iron, and manganese(III) complexes of corroles and porphyrins were examined with regard to their neuroprotective/neurorescue activities by using various neuronal cytotoxic models of oxidative and nitrative stress. The present study demonstrates that the metallocorroles significantly protect human neurobl…
The structure, morphology, and orientation development during deformation of an olefin block copolymer (OBC) and an olefin random copolymer (ORC), based on ethylene−octene composition and with similar overall density, were investigated by in situ synchrotron X-ray scattering and diffraction techniques at room temperat…
Maxwell's fish eye has been known to be a perfect lens within the validity range of ray optics since $1854$. Solving Maxwell's equations, we show that the fish-eye lens in three dimensions has unlimited resolution for electromagnetic waves.
We demonstrate a smooth and low loss silver (Ag) optical superlens capable of resolving features at 1/12th of the illumination wavelength with high fidelity. This is made possible by utilizing state-of-the-art nanoimprint technology and intermediate wetting layer of germanium (Ge) for the growth of flat silver films w…
Gas-flow-directed CH4−H2O CVD was proposed to increase the growth efficiency of 20 centimeters long DWNTs/TWNTs. Water served to maintain the catalyst activity and increased the average growth rate of 10−20 cm CNTs from 20 to 80−90 μm/s.
Two wet chemical methods, namely, wet etching (heterogeneous) and chemical precipitation (homogeneous), have been exploited for the formation of hierarchical ZnO architectures without any specific templates, catalysts, or capping agents. As-synthesized ZnO have been extensively characterized by X-ray diffraction, UV−v…
Yttrium orthorborate YBO 3 containing 0.5 or 5 atom % of Eu 3+ has been prepared by the spray-pyrolysis method. Low-temperature, high-resolution emission spectroscopy has been used to probe the local site symmetries of Eu 3+ ions accommodated on the Y 3+ sites in YBO 3:Eu 3+ (0.5 atom %) and hence to determine the cry…
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 Yu-chen Karen Chen, Yong S. Chu, JaeMock Yi, Ian McNulty, Qun Shen, Peter W. Voorhees, David C. D…
Negative thermal expansion (NTE) materials possess a low-density, open structure which can respond to high pressure conditions, leading to new compounds and/or different physical properties. Here we report that one such NTE material -- white, insulating, orthorhombic Sc2W3O12 -- transforms into a black compound when t…
The hysteresis of magnetization of the anionic, neutral, and cationic forms of a bis(phthalocyaninato)terbium-based complex ([Pc(2)Tb](-/0/+)) have been determined using magnetic circular dichroism (MCD) spectroscopy in frozen dilute solutions at low temperatures (1.5 K) showing that the three oxidation states of the…
By adjustment of solvent conditions for synthesis, virtually monodisperse 4-mercaptobenzoic acid (p-MBA) monolayer-protected gold nanoparticles, 2 and 3 nm in diameter, were obtained. Large single crystals of the 2 nm particles could be grown from the reaction mixture. Uniformity was also demonstrated by the formation…
We theoretically study the joint influence of uniform Dzyaloshinskii-Moriya (DM) interactions, symmetric exchange anisotropy (with its axis parallel to the DM vector) and arbitrarily oriented magnetic fields on one-dimensional spin 1/2 antiferromagnets. We show that the zero-temperature phase diagram contains three co…
We present extensive first principles density functional theory (DFT) calculations dedicated to analyze the magnetic and electronic properties of small V$_{n}$ clusters (n=1,2,3,4,5,6) embedded in a Cu fcc matrix. We consider different cluster structures such as: i) a single V impurity, ii) several V$_{2}$ dimers havi…
Fracture is a fundamental mechanism of materials failure. Propagating cracks can exhibit a rich dynamical behavior controlled by a subtle interplay between microscopic failure processes in the crack tip region and macroscopic elasticity. We review recent approaches to understand crack dynamics using the phase field me…
A bulk left-handed metamaterial with fishnet structure is investigated to show the optical loss compensation via surface plasmon amplification with the assistance of the gain medium of PbS quantum dots. Simultaneously negative permittivity and permeability are confirmed at the telecommunication wavelength (1.5 μm) by…
The effect of the particle size and interparticle distance on the coherent plasmon coupling was studied in 2D arrays of silver nanoparticles. The plasmon coupling leads to the formation of a cooperative plasmon mode characterized by an intense and narrow peak in the blue spectral range. The arrays were fabricated via…
We propose a new material for high power and high density supercapacitors with excellent cycle stability. Graphite oxide (PSS-GO) intercalated with poly(sodium 4-styrensulfonate) showed high performance of electric double layer capacitance (EDLC) compared to that of the pristine graphite oxide. Specific capacitance of…