Materials Literature
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A superhydrophobic substrate that combines the superhydrophobic condensation effect and high enhancement ability of silver nanoparticle coated zinc oxide nanorods array (Ag@ZnO) is explored for surface enhanced Raman scattering (SERS). The effects of water contact angle and droplet volume on the final SERS signal inte…
The green-emitting phosphor Ca3Si2O4N2:Eu2+ was synthesized using a solid-state reaction. The luminescence properties, diffuse reflection spectrum, and thermal quenching were firstly studied, and a white light-emitting diode (wLED) was fabricated using the Eu2+-activated Ca3Si2O4N2 phosphor. Eu2+-doped Ca3Si2O4N2 exhi…
The surface structure of the SrTiO${}_{3}$(110) polar surface is studied by scanning tunneling microscopy and x-ray photoelectron spectroscopy. Monophased reconstructions in (5 $\ifmmode\times\else\texttimes\fi{}$ 1), (4 $\ifmmode\times\else\texttimes\fi{}$ 1), (2 $\ifmmode\times\else\texttimes\fi{}$ 8), and (6 $\ifmm…
In this paper, an overview of the fabrication and properties of high-quality La 0.67 Sr 0.33 MnO 3 (LSMO) thin films is given. A high-quality LSMO film combines a smooth surface morphology with a large magnetization and a small residual resistivity, while avoiding precipitates and surface segregation. In the literatur…
Hydrosol of Au nanoparticles was prepared by citrate reduction of chloroauric acid. The synthesized nanoparticles were characterized through transmission electron microscopy (TEM) and UV–Visible spectroscopy. The prepared nanoparticles were almost spherical in shape with their mean diameter ∼6 nm and possessed face-ce…
Device design helps reduce the power requirements for switching phase-change memory.
We present a combined high-resolution x-ray diffraction and x-ray resonant magnetic scattering study of as-grown BaFe${}_{2}$As${}_{2}$. The structural and magnetic transitions must be described as a two-step process. At ${T}_{S}$ $=$ 134.5 K we observe the onset of a second-order structural transition from the high-t…
The static friction coefficient between two materials is considered to be a material constant. We present experiments demonstrating that the ratio of shear to normal force needed to move contacting blocks can, instead, vary systematically with controllable changes in the external loading configuration. Large variation…
Dislocation climb mobilities, assuming vacancy bulk diffusion, are derived and implemented in dislocation dynamics simulations to study the coarsening of vacancy prismatic loops in fcc metals. When loops cannot glide, comparison of the simulations with a coarsening model based on the line tension approximation shows g…
We theoretically show that the magnon wavepacket has a rotational motion in two ways; a self-rotation and a motion along the boundary of the sample (edge current). They are similar to cyclotron motion of electrons, but unlike electrons the magnons have no charge and the rotation is not due to Lorenz force. These rotat…
The nature of the magnetism in the simplest iron arsenide is of fundamental importance in understanding the interplay between localized and itinerant magnetism and superconductivity. We present the magnetic structure of the itinerant monoarsenide FeAs with the B31 structure. Powder neutron diffraction confirms incomme…
We demonstrate a novel in situ polymerization technique to develop localized polymer coatings on the surface of dispersed pristine graphene sheets. Graphene sheets show great promise as strong, conductive fillers in polymer nanocomposites; however, difficulties in dispersion quality and interfacial strength between fi…
Pt/SrTiO 3 shows promise as a low temperature hydrocarbon combustion catalyst for automotive applications. In this study, SrTiO 3 nanocuboid supports were synthesized using sol-precipitation coupled with hydrothermal synthesis, and platinum was deposited on the nanocuboids with 1, 3, and 5 cycles of atomic layer depos…
In this paper, we report experimentally and theoretically a surface photocatalysis reaction of 4-aminothiophenol (PATP) to p, p ′-dimercaptoazobenzene (DMAB) on Au, Ag, and Cu colloids. Surface enhanced Raman scattering (SERS) spectra of PATP on Au and Cu colloids are significantly different from the normal Raman spec…
Nanodiamond from ozone purification (NDO) demonstrates very distinctive properties within the class of detonation nanodiamonds, namely very high acidity and high colloidal stability in a broad pH range. To understand the origin of these unusual properties of NDO, the nature of the surface functional groups formed duri…
AIMS: To develop novel polypropylene composite materials with antimicrobial activity by adding different types of copper nanoparticles. METHODS AND RESULTS: Copper metal (CuP) and copper oxide nanoparticles (CuOP) were embedded in a polypropylene (PP) matrix. These composites present strong antimicrobial behaviour aga…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTRedox Reactions Catalyzed by Isolated EnzymesDaniela Monti, Gianluca Ottolina, Giacomo Carrea, and Sergio Riva*View Author Information Istituto di Chimica del Riconoscimento Molecolare, C.N.R., Via Mario Bianco 9, 20131 Milano, ItalyE-mail: [email protected]Cite this: Chem. R…
Silica nanoparticles (SiO(2)-NPs) are being used increasingly in diagnosis, imaging, and drug delivery for the central nervous system. However, to date, little is known concerning the potential adverse effects on the brain associated with exposure to SiO(2)-NPs. The present study was conducted to trace, locate, and qu…
Vesicles breathe CO2! A new type of vesicle that self-assembles from amidine-containing diblock copolymer displays “breathing” features. Treating the vesicles with CO2 or Ar can reversibly tune the expansion and contraction of the vesicular volume, as if a bubble is breathing (see picture, PAD=poly((N-amidino)dodecyl…
We demonstrate a method of imaging spatially varying magnetic fields using a thin layer of nitrogen-vacancy (NV) centers at the surface of a diamond chip. Fluorescence emitted by the two-dimensional NV ensemble is detected by a CCD array, from which a vector magnetic field pattern is reconstructed. As a demonstration,…