Prevention of photooxidation in blue–green emitting Cu doped ZnSe nanocrystals
This communication highlights unstable blue-green emitting Cu doped ZnSe nanocrystals stabilized by diluting the surface Se with a calculated amount of S.
Materials Literature
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Carbon nanotube reinforced supramolecular gels with electrically conducting, viscoelastic and near-infrared sensitive properties
Pristine and long-chain functionalized single-walled carbon nanotubes (SWNTs) were incorporated successfully in supramolecular organogels formed by an all-trans tri(p-phenylenevinylene) bis-aldoxime to give rise to new nanocomposites with interesting mechanical, thermal and electrical properties. Variable-temperature…
Thermal and Mechanical Properties of Chitosan/SiO2 Hybrid Composites
Chitosan‐silica (CSSi) hybrid films have been fabricated by sol‐gel process using tetraethoxysilane (TEOS) as precursor. The structure of the resulting hybrid has been characterized by Fourier transform infrared spectroscopy (FTIR). Fracture surface has been revealed through a field emission‐scanning electron microsco…
Surface Free Energy Determination by Contact Angle Measu rements - A Comparison of Various Approaches
One of the parameters characterizing the surfaces of materials is the surface free energy. The most common way to determine its value is to measure the surface tension by the sessile drop method. In this case a contact angle between the surface and the edge of droplets of liquids is measured. There are various approac…
Nano-gold biosynthesis by silica-encapsulated micro-algae: a “living” bio-hybrid material
Klebsormidium flaccidum algal cells exhibiting the ability to form gold nanoparticles intra-cellularly in suspension were encapsulated within silica gels. Optical and electronic microscopy indicate that entrapped cells maintain their ability to reduce gold salts. A difference in the kinetics of gold colloid formation…
DNA mediated water-dispersible graphene fabrication and gold nanoparticle-graphene hybrid
Water dispersible single- and bilayered graphene sheets are produced by a direct exfoliation from graphite flakes in the presence of pyrene-labeled single stranded DNAs, and the immobilized DNA on the graphene surface is further hybridized with a gold nanoparticle labeled complementary DNA to generate gold nanoparticl…
Si quantum dots embedded in an amorphous SiC matrix: nanophase control by non-equilibrium plasma hydrogenation
Nanophase nc-Si/a-SiC films that contain Si quantum dots (QDs) embedded in an amorphous SiC matrix were deposited on single-crystal silicon substrates using inductively coupled plasma-assisted chemical vapor deposition from the reactive silane and methane precursor gases diluted with hydrogen at a substrate temperatur…
Extremely High Resolution Single Crystal Diffractometory for Orbital Resolution using High Energy Synchrotron Radiation at SPring-8
The investigation of accurate structure at charge density level will not only understand the function mechanism of physical property but also lead to design new functional materials. We have successfully installed large cylindrical camera at the BL02B1/SPring‐8. In conceptual design, the image plate (IP) was selected…
A heptadecanuclear MnIII9DyIII8 cluster derived from triethanolamine with two edge sharing supertetrahedra as the core and displaying SMM behaviour
A heterometallic, heptadecanuclear cluster of formula [Mn(III)9Dy(III)8O8(OH)8(tea)2(teaH)2(teaH2)4(Ac)4(NO3)2(H2O)4](NO3)7·8H2O (1) is reported. The core of 1 displays two edge sharing Mn(III)5Dy(III)5 supertetrahedra and represents one of the largest Mn/4f cluster compound so far reported. Magnetic studies show that…
Rapid microwave synthesis of mesoporous TiO2 for electrochromic displays
The fabrication of paper quality electrochromic displays based on the viologen modified TiO2 electrodes (Vio2+/TiO2) requires a cost-effective, energy efficient and rapid synthesis of mesoporous TiO2 with high yield in short reaction time. A straightforward and industrially viable process for the preparation of mesopo…
Universal Plot for Hardness Variation in Pure Metals Processed by High-Pressure Torsion
Various pure metals (Al, Au, Ag, Cu, V, Pt, Ni, Fe, Co, Ti, Zr, Hf, Mo) including Cu-30%Zn are processed by high-pressure torsion. Most of Vickers microhardness (HV) values are expressed by a universal plot when they are normalized as (HV⁄G)(T⁄Tm) and plotted against εP⁄G, where G, T⁄Tm, ε and P are the shear modulus,…
TEMPO: a New Insertion Device Beamline at SOLEIL for Time Resolved Photoelectron Spectroscopy Experiments on Solids and Interfaces
A new insertion device beamline is now operational on straight section 8 at the SOLEIL synchrotron radiation source in France. The beamline and the experimental station were developed to optimize the study of the dynamics of electronic and magnetic properties of materials. Here we present the main technical characteri…
Degradation Mechanism in La[sub 0.8]Sr[sub 0.2]CoO[sub 3] as Contact Layer on the Solid Oxide Electrolysis Cell Anode
Detailed chemical and structural analyses are presented for the degradation mechanism of La 0.8 Sr 0.2 CoO 3 LSC as the contact layer of solid oxide electrolysis cell SOEC anodes. SOEC stack cells, which were operated in the presence of Cr-containing interconnects, and reference half-cells, which were tested with Pt i…
Wafer-scale epitaxial graphene growth on the Si-face of hexagonal SiC (0001) for high frequency transistors
Abstract- Up to two layers of epitaxial graphene have been grown on the Si-face of two-inch SiC wafers exhibiting room-temperature Hall mobilities up to 1800 cm2 V-1 s-1, measured from ungated, large, 160 μm x 200 μm Hall bars, and up to 4000 cm2 V-1 s-1, from top-gated, small, 1 μm x 1.5 μm Hall bars. The growth proc…
Syntheses of Ag/Cu alloy and Ag/Cu alloy core Cu shell nanoparticles using a polyol method
Ag–Cu bimetallic nanoparticles were prepared by reducing mixtures of AgNO3 and Cu(OAc)2·H2O in ethylene glycol (EG) in the presence of poly(vinylpyrrolidone) (PVP) at 175 °C for 5–60 min. At high [Ag]/[Cu] molar ratios of 1 and 2 or at a short reaction time below 5 min, Ag rich Ag/Cu alloy particles were formed. On th…
Selective synthesis of nickel oxide nanowires and length effect on their electrochemical properties
Nickel oxide nanostructures with different lengths have been easily synthesized by calcining nickel foil after soaking in LiOH solution of different concentrations. The measurements of electrochemical properties of these NiO nanostructures show that different lengths of NiO nanostructures would have different electroc…
Selective and highly efficient dye scavenging by a pH-responsive molecular hydrogelator
A structurally simple low molecular weight hydrogelator derived from isophthalic acid forms robust pH-responsive hydrogels capable of highly efficient and selective dye adsorption.
ZnO based field-effect transistors (FETs): solution-processable at low temperatures on flexible substrates
A well-performing ZnO field-effect transistor (FET) on polyethylenenaphthalate (PEN) foil with solution-processed ZnO semiconductor and dielectric material is presented for the first time. In addition, we developed a route that allows preparation of the ZnO semiconductor layer simply from commercially available ZnO di…
Potential Applications of Nanoparticles
Nanoparticles (NP) are defined as particles with a diameter smaller than 100 nm, are increasingly used in different applications, including drug carrier s ystems and to pass organ barriers such as the blood -brain barrier. Because of their unique properties Nanocry stals (quantum dots) and other nanoparticles (gold co…
A linear tetranuclear dysprosium(iii) compound showing single-molecule magnet behaviour
The asymmetric Cole-Cole plots observed in a remarkable linear Dy(III) compound suggests the occurrence of multiple relaxations most likely associated with distinct anisotropic centres, thus opening new avenues for investigating the relaxation dynamics of lanthanide aggregates.