Materials Literature
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A highly efficient direct electrodeposition method was used to prepare Co−Cu alloy nanotubes in an anodic alumina template without modification. The morphology and structure of as-prepared Co−Cu nanotubes were examined by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The format…
We describe a general Monte Carlo (MC) suite for the efficient relaxation of dense systems of freely jointed chains of hard spheres for packing densities (φ) ranging from dilute ones (φ ≈ 0.1) up to the vicinity of the maximally random jammed (MRJ) state (φ ≈ 0.639). Key components of the new MC scheme are as follows:…
The transverse and longitudinal magnetostrictions of LaCoO 3 have been measured in pulsed magnetic fields of up to 35 T in the temperature range between 4.2 and 300 K. The magnetostrictions are proportional to the squared magnetic field of up to B 0 =25 T. The magnetostrictions at B < B 0 are analyzed with a spin-stat…
The mesophase structure of ordered periodic mesoporous organosilicas (PMOs) can be easily adjusted under basic conditions by variation of the sodium hydroxide concentration. PMOs with hexagonal ( p 6 mm, two-dimensional pore system), cubic ( Pm 3 n or Fm 3 m, three-dimensional cagelike pore system), and disordered hex…
Abstract Polyacrylamide/graphite superabsorbent composite was synthesized by free radical polymerization of acrylamide monomer using N,N′‐methylene‐bis‐acrylamide as crosslinker, potassium persulfate as initiator, and graphite as functional filler. On the basis of the superabsorbent composite, a hydrogel with a conduc…
Dilute magnetic semiconductors of Fe-doped ${\mathrm{SnO}}_{2}$ and ${\mathrm{TiO}}_{2}$ with the structure of rutile were prepared in forms of powder and thin films using the techniques of sol gel and pulsed-laser deposition. We present the results of measurement of vibrational density of states of Fe impurity dopant…
A new anisotropic soft-core model is presented, which is suitable for the rapid simulation of liquid crystal mesophases. The potential is based on a soft spherocylinder, which can be easily tuned to favor different liquid crystal mesophases. The soft-core nature of the potential makes it suitable for long-time step mo…
We measured the temperature dependence of resistivity of (TMTTF) 2 SbF 6 under high pressures up to 10 GPa. We observed superconductivity in the title compound for the first time when the high pressure exceeded 5 GPa. The local maximum of the superconducting transition temperatures was T c = 2.8 K at 6 and 9 GPa. The…
Abstract A series of novel poly(ester‐carbonate)s bearing pendant allyl ester groups P(LA‐co‐MAC)s were prepared by ring‐opening copolymerization of L‐lactide (LA) and 5‐methyl‐5‐allyloxycarbonyl‐1,3‐dioxan‐2‐one (MAC) with diethyl zinc (ZnEt2) as initiator. NMR analysis investigated the microstructure of the copolyme…
Abstract Poly(ethylene terephthalate)/expanded graphite conductive composites were prepared by the melt‐blending method. The relationships between the preparation methods, microstructures, and conductivity properties of the composites were studied with scanning electron microscopy and conductivity measurements. The re…
In this paper, we report magnetostriction measurements, (λ100) on Fe-rich Fe–Al alloys and Fe50Co50 as functions of temperature from 77K to room temperature (RT). From these measurements and elastic constant (c′) measurements, the tetragonal magnetoelastic coupling constants (b1’s) were calculated. Significant differe…
Tb 3+ - and Eu 3+ -doped lanthanum oxysulfide nanocrystals (NCs) with homogeneous grain size have been prepared by a gel-network coprecipitation method using gelatin as the template and ammonium sulfate as the sulfurizing agent and a following reduction process at relatively low temperatures (750 °C) in a H 2 atmosphe…
The noise properties of single-walled carbon nanotube transistors (SWNT-FETs) are essential for the performance of electronic circuits and sensors. Here, we investigate the mechanism responsible for the low-frequency noise in liquid-gated SWNT-FETs and its scaling with the length of the nanotube channel down to the na…
Nanoscale constraint is known to have a significant impact on the thermal properties of materials. Although thermosetting resins have been cured in the presence of nanoparticles and nanotubes, cure of thermosetting resins under the well-defined nanoscale constraints imposed by controlled pore glass (CPG) or similar ma…
An amphiphilic pyrene derivative (PyDNH3) bearing positively charged ammonium cations has been synthesized and characterized. Self-assembly of PyDNH3 in the presence of chiral tryptophan derivatives was investigated in ethanol/water by optical and chiroptical spectra, indicating the formation of helical aggregates. Sc…
In the experiments described in this paper, micromachined silicon post surfaces were coated with thin films of a polymer for which the contact angle on the smooth material was around 70 degrees . Drops wetted these surfaces in the Wenzel or "penetration" mode. We have determined the advancing and receding angles as a…
The formation of CO2 in the gas phase and on a polyaromatic hydrocarbon surface (coronene) via three possible pathways is investigated with density functional theory. Calculations show that the coronene surface catalyses the formation of CO2 on model grain surfaces. The addition of O-3 to CO is activated by 2530 K in…
We present a study of photoconductivity in close-packed films of CdSe/ZnS core/shell nanocrystals, from which the majority of the organic ligands are removed. The ZnS inorganic shells separate the CdSe cores, and passivate the surface of the CdSe nanocrystals, slowing the nonradiative exciton decay rate. These films r…
Abstract Tissue engineering scaffolds require a controlled pore size and structure to host tissue formation from cell populations. Supercritical carbon dioxide (scCO2) processing can be used to form porous scaffolds in which the escape of CO2 from a plasticized polymer melt generates gas bubbles that shape the pores.…
Au−Pd nanoparticles supported on a variety of oxides are known to be highly active catalysts for a number of interesting reactions, including the direct synthesis of H 2 O 2 from H 2 and O 2 . A systematic series of Au−Pd/Al 2 O 3 catalysts, subjected to a variety of heat treatments, have been examined by STEM-XEDS an…