Materials Literature
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Nanoscale isotope and chemical images of grains of Amelia albite that were reacted with 2 m 18 O-enriched solution of KCl show a correspondence between O-isotope exchange and K-Na exchange. Experiments were conducted for 4.6 d at 600 °C and 200 MPa. After 6 d, the 150 µm diameter albite grains had 5.20 µm rims in whic…
Glancing-angle deposition (GLAD) is a fabrication method capable of producing thin films with engineered nanoscale porosity variations. GLAD can be used to create optical thin-film interference filters from a single source material by modification of the film refractive index through control of film porosity. We prese…
New experimental results, and a plausible theoretical understanding thereof, are presented for the flow-induced currents and voltages observed in single-walled carbon nanotube samples. In our experiments, the electrical response was found to be sublinear---nearly logarithmic---in the flow speed over a wide range, and…
The local structure of vanadium (V) in synthetic glasses of basaltic composition has been studied by means of high-resolution V K-edge X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy to obtain quantitative data on <V-O> distances, V coordination numb…
The valve morphology and ultrastructure of the the so-called “stelligeroid” taxa of the genus Cyclotella (Kützing) Brébisson (Bacillariophyceae) are discussed. These taxa have marginal mltoportulae and the rimoportula(e) positioned between costae. As this and other discussed characters do not fit the current descripti…
Heart valve disease is a significant medical problem worldwide. Current treatment for heart valve disease is heart valve replacement. State of the art replacement heart valves are less than ideal and are associated with significant complications. Using the basic principles of tissue engineering, promising alternatives…
In situ falling-sphere measurements of viscosity have been performed to determine the viscosity of dacite melt (68 wt% SiO 2 ) from 1.5 to 7.1 GPa at temperatures between 1730 and 1950 K, using the T-25 MA8 multianvil apparatus at the GSECARS 13-ID-D beamline at the Advanced Photon Source, Argonne National Lab. The vi…
MgAl 2 O 4 spinel was successfully synthesized using a mechanochemical route that avoided the formation and calcination of its precursors at high temperatures. The method involved a single step in which γ‐Al 2 O 3 –MgO, AlO(OH)–MgO, and α‐Al 2 O 3 –MgO mixtures were milled at room temperature under air atmosphere. The…
In this study, we demonstrate the synthesis of branched oligothiophene dendrons that act as electroactive surfactants for the capping of CdSe nanocrystals through a ligand exchange process. The number of dendrons per nanocrystal and the nature of surface coordination interactions were studied in detail using UV−vis, F…
A homologous series of linear liquid crystal trimers, the 4,4′-bis[ω-(4-methoxyazobenzene-4′-yloxy)alkoxy]azobenzenes, has been synthesized and characterized. The transitional properties of the trimers are compared with those of the corresponding series of dimers, the α,ω-bis(4-methoxyazobenzene-4′-oxy)alkanes, and mo…
Freeze casting for Al 2 O 3 was accomplished at room temperature with nonaqueous sublimable vehicles in the naphthalene–camphor eutectic system with a eutectic temperature of 31°C. A fully dense sintered body (>99.5% of theoretical density (T.D.)) was obtained with a eutectic composition vehicle, whereas at most 90…
The shake-up transition energies of the carbon $1s$ photoelectron spectrum of metal-free phthalocyanine $({\mathrm{H}}_{2}\mathrm{Pc})$ have been calculated by means of time-dependent density functional theory, for which an equivalent core approximation is adopted. Model calculations for the $\mathrm{C}\phantom{\rule{…
We here demonstrate the creation of novel poly(aniline) (PANI) nanofiber structures by a polymer wrapping method using schizophyllan (SPG). Mannose-modified SPG can also wrap PANIs to give nanofibers having a lectin affinity. This interaction is applicable to designing novel PANI/protein composites. The results establ…
The chemical erosion of carbon in interaction with a hydrogen plasma has been studied in detail in ion beam experiments, and erosion yield values are available as a function of ion energy and surface temperature. However, the conditions in the ITER divertor cannot be simulated by ion beam experiments, especially as fa…
Alumina membranes filled with mesoporous silica, either nanowires or nanotubes, have been prepared. The orientation of the mesopores relative to the alumina host can be controlled by varying the aging environment.
Using computer simulations, we investigate the benefits of coating substrates that contain nanoscale defects with nanoparticle-filled polymer films. In particular, we focus on surfaces that contain a nanoscopic notch and use molecular dynamics (MD) simulations to determine the particle and polymer distribution on the…
In this paper we review a new method to move nano-objects on a polymer surface that is made from diblock-copolymer and mixed brushes. Such brush systems consist of polymer chains covalently attached to a surface with high grafting density. If the two polymeric components the brush consists of are incompatible with eac…
The effect of the chemical composition on the structure of Cr‐Al‐C was studied by combinatorial thin film synthesis. By changing the Cr/C ratio from 1.72 to 3.48 and the Cr/Al ratio from 1.42 to 4.18 the formation of Cr 2 AlC, Cr 2 Al and Cr 23 C 6 phases was observed. Furthermore, based on X‐ray diffraction a single…
The X-ray structure of native cellobiohydrolase IB (CBH IB) from the filamentous fungus Talaromyces emersonii, PDB 1Q9H, was solved to 2.4 A by molecular replacement. 1Q9H is a glycoprotein that consists of a large, single domain with dimensions of approximately 60 A x 40 A x 50 A and an overall beta-sandwich structur…
Sustainable biotechnological production of polyhydroxyalkanoates from renewable resources is an alternative to chemical polyster production from mineral oils. The polymers produced are biodegradable, and due to their characteristics can be used for the production of packaging materials. Many different prokaryotic micr…