Materials Literature
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Abstract Monometallic Pt/C, Au/C and bimetallic PtAu/C nanocomposites have been prepared by metal vapour synthesis using Vulcan XC‐72R carbon support. X‐ray photoelectron spectroscopy and transmission electron microscopy were used to evaluate the structure and properties of the metallic nanoparticles. XPS data show t…
We investigate equilibrium transport of gas–water mixtures, such as CO2–water, O2–water and H2–water mixtures, in carbon nanotubes using molecular dynamics simulations. Our results indicate that gases are selectively physisorbed in carbon nanotubes forming single-file gas chains. Once the single-file gas chains are fo…
The Young's modulus ( E ) and nanoindentation (NI) stress–strain curves of fully dense, transparent yttria were determined using a nano‐indenter capable of continually measuring the stiffness ( S ). Two hemispherical indenters with radii of 1.4 and 5 μm were used, in addition to a Berkovich tip. The E values—calculate…
Abstract We present a microscopic theory describing the charge carrier and light emission dynamics in quantum dot (QD) light emitters. The theory covers non‐classical light emission (fluorescence and Raman emission) in the low carrier injection limit as well as laser emission and pulse amplification in the high carrie…
The joint x-ray/neutron diffraction model of the Type I copper protein, amicyanin from Paracoccus denitrificans was determined at 1.8 A resolution. The protein was crystallized using reagents prepared in D(2)O. About 86% of the amide hydrogen atoms are either partially or fully exchanged, which correlates well with th…
The new semiconducting thiophosphate compounds KZrPS(6), RbZrPS(6), and CsZrPS(6) exhibit red light emission at room temperature. The materials have longer photoluminescence lifetimes than most of the inorganic chalcogenide semiconductors. They can be solution processed into thin films for potential device fabrication.
PURPOSE: To demonstrate water- and fat-suppressed proton projection MRI (WASPI) in a clinical scanner to visualize the solid bone matrix in animal and human subjects. MATERIALS AND METHODS: Pig bone specimens and polymer pellets were used to optimize the WASPI method in terms of soft-tissue suppression, image resoluti…
BACKGROUND: Small molecules are of increasing interest for bioinformatics in areas such as metabolomics and drug discovery. The recent release of large open access chemistry databases generates a demand for flexible tools to process them and discover new knowledge. To freely support open science based on these data re…
Abstract The degradation and prestabilization of polyacrylonitrile (PAN) were investigated with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). The initial temperature, initial loss‐weight temperatures, and loss‐weight were significantly lo…
The properties of a molecular quantum dot system are investigated using a novel structure of vertical molecular transistor. This C60-based device can be operated in two new modes: voltage-controlled switching and gate-controlled hysteresis. A polaron-based model is used to explain the operation of the transistor and t…
Biroli 's extension of the standard mode-coupling theory to inhomogeneous equilibrium states [G. Biroli, J. P. Bouchaud, K. Miyazaki, and D. R. Reichman, Phys. Rev. Lett. 97, 195701 (2006)] allowed them to identify a characteristic length scale that diverges upon approaching the mode-coupling transition. We present a…
The present work provides new information on the characteristics of ion implanted metallic surfaces responsible for the adjustment of stable dropwise condensation (DWC) of steam. The results are based on condensation experiments and surface analyses via contact angle (CA) and surface free energy (SFE) measurements as…
Abstract The formation of nanotube oxide layers on Ti6Al7Nb alloy in H 3 PO 4 acid solutions containing fluoride ions is presented here. Among several parameters influencing the quality of nanotubes formed anodically such as potential, time of anodizing, fluoride ions concentration and scan rate of polarization, in pa…
The Italian steel producer Acciaieria Arvedi SpA operates a minimill for flat rolled products with a single casting line (maximum width, 1300 mm) in Cremona, Italy, with an annual output of 1·3 million tonnes per year of flat products using inline strip production (ISP) technology, patented by Arvedi. Following this p…
We report a self-assembly method that aligns nanometer-sized quantum dots (QDs) into a straight line along which photonic signals can be transmitted by optically near-field effects. ZnO QDs were bound electrostatically to DNA to form a one-dimensional QD chain. The photoluminescence intensity under parallel polarizati…
Abstract This work follows previous studies in which we demonstrated the feasibility of molecular depth profiling with time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS), using a low‐energy Cs + source for sputtering. Poly(methyl methacrylate) (PMMA), polycarbonate (PC) and polystyrene (PS) thin films were inve…
Separated local field (SLF) experiments have been used for almost three decades to obtain structural information in solid-state NMR. These experiments resolve chemical shift anisotropy (CSA) from dipole-dipole interactions (dipolar couplings, DC) in isolated spin systems. Both CSA and DC data can be converted into ori…
Mechanical strain has become an important tool in tissue engineering for progenitor cell differentiation. Furthermore, it is used to enhance the mechanical properties of engineered tissue constructs. Although strain amplitude and frequency are well investigated and optimal values are known; application of various stra…
Thermodynamic cat attacks! Iodide-catalyzed reversible nucleophilic attacks have been exploited to access side-chain polycatenanes under thermodynamic control. Multiple catenations occurring all along the polymer chain are entirely driven to completion by the intra- and intermolecular side-chain π⋅⋅⋅π stacking interac…
Cell detachment procedures can cause severe damage to cells. Many studies require cells to be detached before measurements; therefore, research on cells that have been grown attached to the bottom of the culture dish and later detached represents a special problem with respect to the experimental results when the prop…