Synthesis and characterization of monodisperse chitosan nanoparticles with embedded quantum dots
10.1088/0957-4484/17/1/022
Materials Literature
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Multiferroic composite ferroelectric-ferromagnetic films
Multiferroic behavior was confirmed for epitaxial composite ferroelectric-ferromagnetic heterostructures, using a ferromagnetic crystal as both substrate and straining medium. Heterostructures having 2-2 connectivity (plane-on-plane) were fabricated by chemical solution deposition of Pb(Zr0.3,Ti0.7)O3 (PZT) thin films…
Sol–gel transition behavior of biodegradable three‐arm and four‐arm star‐shaped PLGA–PEG block copolymer aqueous solution
Abstract Two types of temperature‐sensitive biodegradable three‐arm and four‐arm star‐shaped poly( DL ‐lactic acid‐ co ‐glycolic acid‐ b ‐ethylene glycol) (3‐arm and 4‐arm PLGA–PEG) were successfully synthesized via the coupling reaction of 3‐arm and 4‐arm PLGA and α‐monocarboxyl‐ω‐monomethoxypoly(ethylene glycol) (CM…
Architecture of a Biocompatible Supramolecular Material by Supersaturation-Driven Fabrication of its Fiber Network
The architecture of a biocompatible organogel formed by gelation of a small molecule organic gelator, N-lauroyl-L-glutamic acid di-n-butylamide, in isostearyl alcohol was investigated based on a supersaturation-driven crystallographic mismatch branching mechanism. By controlling the supersaturation of the system, the…
Size-Dependent Orientation Growth of Large-Area Ordered Ni Nanowire Arrays
Large-area ordered Ni nanowire arrays with different diameters have been fabricated by the direct current electrodeposition into the holes of porous anodic alumina membrane. The crystal structure and micrograph of nanowire arrays are characterized by X-ray diffraction, field-emission scanning electron microscopy and h…
Magnetically steered liquid crystal-nanotube switch
A magnetically steered electric switch based on nematic liquid crystal-single-wall carbon nanotube dispersions is demonstrated. The device exploits the conductivity anisotropy of nanotubes in combination with the magnetic Freedericksz transition of a nematic liquid crystal. The performance is characterized with respec…
Nanoparticles and Cell Longevity
The field of engineering has made substantial strides in nanotechnology, in the realm of materials science and construction of nanoscale devices. Nanomedicine encompasses application of cutting edge engineered nanostructures to biological systems and development of novel strategies for disease intervention. In the cur…
Effectiveness of Stress Grading Coatings on Form Wound Stator Coil Groundwall Insulation Under Fast Rise Time Pulse Voltages
In this paper, the effectiveness of stress grading coatings (SGCs) on form wound stator coil groundwall insulation under fast rise time pulses is analyzed. The combined performance of the stress grading coating and the semiconductive slot coating is studied under fast rise time transient voltages. During the rapid ris…
Surface Modification and Laser Pulse Length Effects on Internal Energy Transfer in DIOS
Benzyl-substituted benzylpyridinium (BP) chloride salts were used as a source of thermometer ions to probe the internal energy (IE) transfer in desorption/ionization on porous silicon (DIOS). To modify their wetting properties and the interaction energies with the thermometer ions, the DIOS surfaces were silylated to…
Promiscuity in the part‐phosphorylative Entner–Doudoroff pathway of the archaeon Sulfolobus solfataricus
The hyperthermophilic archaeon Sulfolobus solfataricus metabolises glucose and galactose by a 'promiscuous' non-phosphorylative variant of the Entner-Doudoroff pathway, in which a series of enzymes have sufficient substrate promiscuity to permit the metabolism of both sugars. Recently, it has been proposed that the pa…
Atomic Mechanisms of Grain Boundary Motion
We present results of atomistic computer simulations of spontaneous and stress-induced grain boundary (GB) migration in copper. Several symmetrical tilt GBs have been studied using the embedded-atom method and molecular dynamics. The GBs are observed to spontaneously migrate in a random manner. This spontaneous GB mot…
In Vivo Biodistribution of Dendrimers and Dendrimer Nanocomposites — Implications for Cancer Imaging and Therapy
Our results indicate that the surface chemistry, composition, and 3-D structure of nanoparticles are critical in determining their in vivo biodistribution, and therefore the efficacy of nanodevice imaging and therapies. We demonstrate that gold/dendrimer nanocomposites in vivo, present biodistribution characteristics…
Palladium Nanoclusters in Sonogashira Cross‐Coupling: A True Catalytic Species?
Abstract The question of whether palladium nanoclusters are the actual catalysts in the so‐called ‘cluster–catalyzed Sonogashira cross‐coupling’ is investigated, using the coupling of phenylacetylene with 4‐bromobenzonitrile as a model reaction. By combining a detailed kinetic analysis with transmission electron micro…
A Stereoelectronic Effect on Turn Formation Due to Proline Substitution in Elastin-Mimetic Polypeptides
Stereoelectronic effects have been identified as contributing factors to the conformational stability of collagen-mimetic peptide sequences. To assess the relevance of these factors within other protein structural contexts, three polypeptide sequences were prepared in which the sequences were derived from the canonica…
Corrosion inhibition of mild steel by Datura metel in acidic medium
Purpose To evaluate the corrosion inhibition potential of Datura metel in acid medium on mild steel (MS) with a view to develop green corrosion inhibitors. Design/methodology/approach Acid extract of the D. metel was studied for its corrosion inhibitive effect by electrochemical and weight loss methods. Using weight l…
Photo‐aligning by azo‐dyes: Physics and applications
Liquid crystal photo‐alignment using azo‐dyes is reviewed. This alignment method is very different from previously reported ones, such as photo‐crosslinking, photo degradation and photo‐isomerization. It will be shown that this photo‐aligning method can provide a controllable pretilt angle and strong anchoring energy…
Brain Tumors: Full- and Half-Dose Contrast-enhanced MR Imaging at 3.0 T Compared with 1.5 T—Initial Experience
PURPOSE: To prospectively and intraindividually compare the effect of magnetic resonance (MR) imaging at a higher magnetic field strength (3.0 T) on contrast-to-noise ratio (CNR) at different doses of a T1-shortening contrast agent in patients with contrast-enhancing brain lesions, with 1.5-T MR imaging as a reference…
Development and evaluation of an edible antimicrobial film based on yam starch and chitosan
Edible antimicrobial films are an innovation within the biodegradable active packaging concept. They have been developed in order to reduce and/or inhibit the growth of microorganisms on the surface of foods. This study developed an edible antimicrobial film based on yam starch (Dioscorea alata) and chitosan and inves…
Piezoelectric Polyethylene Terephthalate (PETP) Foams – Specifically Designed and Prepared Ferroelectret Films
The ferroic and electroactive properties of the recently identified ferroelectrets are based on the quasi‐permanent internal electric charging of the cellular structure in polymer foams. Drawing on the wealth of expertise and insight that was obtained on cellular polypropylene (PP) and in particular on structure‐prope…
Comparative Study on the Catalytic Performance of Single-Phase Mo−V−O-Based Metal Oxide Catalysts in Propane Ammoxidation to Acrylonitrile
Five single-phase Mo−V−O-based mixed metal oxides, Mo−V−O, Mo−V−Te−O, Mo−V−Sb−O, Mo−V−Te−Nb−O, and Mo−V−Sb−Nb−O, all of which assume the same orthorhombic structure, were prepared by hydrothermal method, and propane ammoxidation to acrylonitrile (AN) using these mixed oxides as catalysts was performed in order to clar…