Materials Literature
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Colossal magnetoresistance is a rare phenomenon in which the electronic resistivity of a material can be decreased by orders of magnitude upon application of a magnetic field. Such an effect could be the basis of the next generation of memory devices. Here we report CMR in the antiferromagnetic oxypnictide NdMnAsO(1-x…
A neptunium analog of the LaFeAsO tetragonal layered compound has been synthesized and characterized by a variety of experimental techniques. The occurrence of long-range magnetic order below a critical temperature ${T}_{\mathrm{N}}$ $=$ 57 K is suggested by anomalies in the temperature-dependent magnetic susceptibili…
Experiments on quasi-one-dimensional systems such as quantum wires and metallic chains on surfaces suggest the existence of electron-electron interactions of substantial range and hence physics beyond the Hubbard model. We therefore investigate one-dimensional, quarter-filled chains with a Coulomb potential with varia…
Abstract Nanofibrous biocomposite scaffolds of poly(vinyl alcohol) (PVA) and graphene oxide (GO) were prepared by using electrospinning method. The microstructure, crystallinity, and morphology of the scaffolds were characterized through X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scan…
The size-dependent nature of the molar extinction coefficient of highly photoluminescent copper indium sulfide (CuInS 2 ) quantum dots (CIS-QDs) is presented. We determined the extinction coefficients at both high photon energy (3.1 eV) and at the first excitonic transition band for CIS-QDs, ranging in size from 2.5 n…
Macromolecular ligands for gadolinium contrast agents (CAs) were prepared via a “grafting to” strategy. Copolymers of oligoethylene glycol methyl ether acrylate (OEGA) and an activated ester monomer, pentafluorophenyl acrylate (PFPA), were synthesized and modified with the 1-(5-amino-3-aza-2-oxypentyl)-4,7,10-tris( te…
Monolithic aerogels of polymeric organic framework (Mon-POF) with a high density of OH functional groups were synthesized through solvothermal polymerization of terephthalaldehyde and 1,5-dihydroxynaphthalene. This POF material presents high surface area of 1230 m 2 g –1 having micro-, meso-, macropores, and low bulk…
The activation of dioxygen is a key step in CO oxidation catalyzed by gold nanoparticles. It is known that small gold cluster anions with even-numbered atoms can molecularly chemisorb O(2) via one-electron transfer from Au(n)(-) to O(2), whereas clusters with odd-numbered atoms are inert toward O(2). Here we report sp…
A quantitative understanding of the dynamics of biological neural networks is fundamental to gaining insight into information processing in the brain. While techniques exist to measure spatial or temporal properties of these networks, it remains a significant challenge to resolve the neural dynamics with subcellular s…
Several physical properties of the superconducting Heusler compounds, focusing on two systems (Sc, Y, Lu)Pd${}_{2}$Sn and $A$Pd${}_{2}M$, where $A$ $=$ Hf, Zr and $M$ $=$ Al, In, are summarized and compared. The analysis of the data shows the importance of the electron-phonon coupling for superconductivity in this fam…
C60-styryl Bodipy dyads that show strong absorption of visible light (ε = 64,600 M(-1) cm(-1) at 657 nm) and a long-lived triplet excited state (τT = 123.2 μs) are prepared. The dyads were used as heavy-atom-free organic triplet photosensitizers for photooxidation of 1,5-dihydroxynaphthalene via the photosensitizing o…
Graphene oxide filled polymer nanocomposites are found to possess excellent nonlinear electrical conductivity, low conductivity at low field and a good combination of increased dielectric constant and low loss factor. Those outstanding electrical properties are achieved at filler loading of 3% and controllable by adju…
Responsive nanoparticles that release their drug cargo in accordance with a change in pH or oxidative stress are of significant clinical interest as this approach offers the opportunity to link drug delivery to a specific location or disease state. This research news article reviews the current state of this field by…
Superparamagnetic iron oxide nanoparticles are widely used in biomedical applications, yet questions remain regarding the effect of nanoparticle size and coating on nanoparticle cytotoxicity. In this study, porcine aortic endothelial cells were exposed to 5 and 30 nm diameter iron oxide nanoparticles coated with eithe…
Perylene bisimides are among the most valuable functional dyes and have numerous potential applications. As a result of their chemical robustness, photostability, and outstanding optical and electronic properties, these dyes have been applied as pigments, fluorescence sensors, and n-semiconductors in organic electroni…
Metal-based nanoparticles (NPs) (e.g., silver, zinc oxide, titanium dioxide, iron oxide) are being widely used in the nanotechnology industry. Because of the release of particles from NP-containing products, it is likely that NPs will enter the soil compartment, especially through land application of sewage sludge der…
A core–shell structure of polypyrrole grown on V2O5 nanoribbons as a high performance anode material for supercapacitors is fabricated using anionic dodecylbenzenesulfonate (DBS−) as surfactant. Benefiting from the nanoribbon morphology of V2O5, the improved charge-transfer and polymeric coating effect of PPy, PPy@V2O…
The decontamination of bisphenol A (BPA) from aqueous solution by graphene adsorption was investigated. The maximum adsorption capacity (q(m)) of graphene for BPA obtained from a Langmuir isotherm was 182 mg/g at 302.15 K, which was among the highest values of BPA adsorption compared with other carbonaceous adsorbents…
Carbon nanotubes (CNTs) were first specifically identified and described in 1991.<sup>1</sup> These nanoscale materials have since been widely used in a variety of fields due to their extraordinary properties, including high surface area, high mechanical strength, electronic properties, and excellent chemical and ther…
This paper describes the corrosion behaviour of SiO2 glass hollow fibres by hydrofluoric acid (HF). The decrease of corrosion rate after 6 h etching could be explained by the change of surface area and concentration of the HF solution. The small and positive ΔS implies that the decrease in disordering takes place due…