Materials Literature
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The effects of Au grains on graphene conduction and doping are investigated. To obtain a clean Au-graphene contact, Au grains are deposited over graphene before any chemical processing. The bulk and the effective contact resistance versus gate voltage demonstrate that Au grains cause p-doping in graphene. The Fermi le…
This article investigates the defects in ZnO created during its synthesis and its affect on the second and third-order nonlinear processes.
When CdSe/ZnS-polyethyleneimine (PEI) quantum dots (QDs) are microencapsulated in polymeric microcapsules, human fibroblasts are protected from acute cytotoxic effects. Differences in cellular morphology, uptake, and viability were assessed after treatment with either microencapsulated or unencapsulated dots. Specific…
This study aims at an investigation of the impurity gases emitted during the decomposition of borohydrides. For this we have set up a quantitative gas analysis based on a combination of FTIR spectroscopy and gravimetry. We show that the emission of various intermediates, in particular diborane, depends sensitively on…
Abstract We report the quaternary Heusler compound derivatives CoFe 1+ x Ti 1– x Al and CoMn 1+ x V 1– x Al, which do not have centers of inversion. Classical T 2 T′M (T, T′ = transition metal, M = main group element) Heusler compounds (prototype: Cu 2 MnAl) crystallize in the L 2 1 structure, space group Fm $\bar {3}…
Diatom oxylipins have been observed to deleteriously impact copepod reproductive success. However, field studies have revealed very variable and case-dependent results. Therefore, the plasticity of diatom oxylipin metabolism was studied among four clones of the marine diatom Skeletonema marinoi Sarno et Zingone. Diato…
Time-resolved luminometry-based assays have great potential for measurements in complicated biological solutions and living cells as the measured signal can be easily distinguished from nanosecond lifetime background fluorescence of organic compounds and autofluorescence of cells. In the present study we discovered th…
We use computer simulations to investigate the crystallization dynamics of sedimenting hard spheres in large systems (hundreds of thousands of particles). We show that slow sedimentation results primarily in face-centered cubic (fcc) stacked crystals, instead of random hexagonal close packed or hexagonal close packed…
Variations in the spatial density of carbon nanotubes (CNTs), resulting from the lack of precise control over CNT positioning during chemical synthesis, is a major hurdle to the scalability of carbon nanotube field effect transistor (CNFET) circuits. Such CNT density variations can lead to non-functional CNFET circuit…
Panchromatische Sensibilisatoren: Mehrere Ruthenium(II)-Verbindungen mit drei Thiocyanatliganden und einem neuartigen chelatisierenden Terpyridinliganden wurden hergestellt. Letzterer (siehe Bild; die Farben geben die Orbitalbesetzung wieder) dient als effektives Lichtsammelauxochrom. Eine der Verbindungen hat eine Um…
Strong fluence dependence of photodesorption cross sections is observed in femtosecond laser photodesorption of NO from (NO)2 on silver nanoparticles, in contrast to femtosecond photodesorption on bulk metals. The time scale of excitation buildup is found to be equal or less than the pulse duration of ∼100 fs; NO tran…
Transmission gratings that combine a large diffraction angle with a high diffraction efficiency and a low angular and wavelength dispersion could be used to collect sunlight in a light guide. In this paper we compare the diffractive properties of polarization gratings and classical surface-relief gratings and explore…
An oxidative enzyme, horseradish peroxidase (HRP), was immobilized on phosphorus- and/or calcium-modified MCM-41 mesoporous silicas with suitable pore diameters. Structural analyses by means of XRD and nitrogen adsorption confirmed that the P- and/or Ca-modified MCM-41 materials retained their structural quality even…
This paper presents an Improved Bagging Algorithm (IBA) to recognize ultra-high-frequency (UHF) signals of partial discharges (PDs). This approach establishes the sample information entropy for each sample and the re-sampling process of the traditional Bagging algorithm is optimized. Four typical discharge models were…
Room-temperature superparamagnetic greigite nanoplatelets were synthesized using 3-methyl catechol as growth moderator and phase-control agent, in the presence of sulfur, thiosulfate, octadecylamine, and Fe 2+ . Dense films of nanoplatelets showed ohmic behavior in the 10–300 K range. In as-deposited films the resisti…
Jute and bamboo fiber-reinforced polypropylene (PP) based composites (50 wt% fiber) were fabricated by compression molding. Tensile strength (TS), bending strength (BS), tensile modulus (TM), and bending modulus (BM) of the jute-reinforced PP composite were found to be 48, 56, 900, and 1500 MPa, respectively. Then, ba…
Large quantities of hexagonal boron nitride ( h‐BN ) nanoplates with hexagonal morphologies have been successfully synthesized by a simple two‐step route without using any template or catalyst, including combustion synthesis and then annealing processes. The phase content, morphology, and optical properties of the pro…
The efficient synthesis of all-acrylic, film-forming, core-shell colloidal nanocomposite particles via in situ aqueous emulsion copolymerization of methyl methacrylate with n-butyl acrylate in the presence of a glycerol-functionalized ultrafine silica sol using a cationic azo initiator at 60 °C is reported. It is show…
The levels of exposure and internal doses of nanomaterials are becoming more and more important for estimating the health effects resulting from exposure to nanomaterials. Health surveillance can be used as an indicator of whether exposure is occurring, rather than in determining if levels of exposure are safe. We hav…
The armchair carbon nanotube is an ideal system to study fundamental physics in one-dimensional metals and potentially a superb material for applications such as electrical power transmission. Synthesis and purification efforts to date have failed to produce a homogeneous population of such a material. Here we report…