Materials Literature
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A resonant microwave cavity operating in the TM010 mode was used to determine the microwave susceptibility of single walled carbon nanotubes (SWNT) that are blended in polymer matricies. The frequencies of the probe signal were 9.8, 11.4, and 35.93 GHz. Samples of 3%–19% blends of SWNT in polycarbonate were tested to…
Susceptibility, specific heat, and muon spin rotation measurements on high-quality single crystals of ${\mathrm{Na}}_{0.82}{\mathrm{CoO}}_{2}$ have revealed bulk antiferromagnetism with N\'eel temperature ${T}_{\mathrm{N}}=19.8\ifmmode\pm\else\textpm\fi{}0.1\mathrm{K}$ and an ordered moment perpendicular to the ${\mat…
Abstract Polydisperse 1,1,1,3,5,5,5‐heptamethyltrisiloxane‐oligo(propylene oxide‐ block ‐ethylene oxide) wetting agents were synthesized through the hydrosilylation of 1,1,1,3,5,5,5‐heptamethyltrisiloxane (HMTS) with active hydrogen and allyl oligo(propylene oxide‐ block ‐ethylene oxide) [allyl oligo(PO‐ b ‐EO)] with…
Surface modification of fine alumina powders (60 μm) by plasma-enhanced chemical vapor deposition (PECVD) at atmospheric pressure was carried out in a circulating fluidized bed reactor (18 mm i.d. by 1 m height). A stable glow discharge under atmospheric pressure can be attained successfully at a source frequency of 1…
Abstract For Abstract see ChemInform Abstract in Full Text.
We show in this Communication that the combination of Rietveld and pair distribution function (PDF) analyses allows unique insight into the nature and driving force of the phase transition of alpha-AlF3, which was not available from conventional structural analysis methods alone. The use of image plate technology allo…
Measurements of the spectrum of sonoluminescence from an isolated bubble driven at 1 MHz are well fit by assuming thermal bremsstrahlung from a transparent 10(6) degree plasma. According to this interpretation, the photon-matter mean free path is larger than the light-emitting radius of a 1 MHz bubble, but smaller tha…
Abstract For Abstract see ChemInform Abstract in Full Text.
The perovskite single crystal solid solution of 0.43BiScO3–0.57PbTiO3 (BSPT57) was reported to possess a high Curie temperature (TC∼402 °C) and rhombohedral to tetragonal phase transition temperature (TR–T∼349 °C) with excellent electromechanical properties (k33∼90%). In this work, the resonance method was used to det…
Three ion pair complexes, [4-R-benzylpyridinium][bis(maleodinitriledithiolato)platinum(III)] (abbreviated as [RBzPy][Pt(mnt)(2)]; R = Cl (1), Br (2), or NO(2) (3)), have been synthesized. The cations and anions stack into well-separated columns in the solid state, and the Pt(III) ions form a 1-D zigzag chain within a…
Magnetostrictive materials are routinely employed as actuator and sensor elements in a wide variety of noise and vibration control problems. In infrastructural applications, other technologies such as hydraulic actuation, piezoelectric materials and more recently, magnetorheological fluids, are being favored for actua…
Abstract A series of novel xerogels based on sodium acrylate (NaA), montmorillonite (MMT), and N , N ′‐methylene‐bisacrylamide (NMBA) were prepared by inverse suspension polymerization and water solution polymerization. The influences of pure MMT, intercalated MMT, the method of polymerization, and the content of the…
We combined resonant photoabsorption and vibration spectroscopy with scanning tunneling microscopy (STM) to unambiguously identify the presence of Stone-Wales (SW) defects in carbon and boron nitride nanotubes. Based on extensive time-dependent ab initio density functional calculations, we propose to resonantly photoe…
Abstract The effects of the incorporation of single‐walled carbon nanotubes (SWNTs) on the physical and mechanical properties of natural rubber (NR) are described. Characterization of these new materials has been performed by dynamic mechanical analysis, differential scanning calorimetry, and Raman spectroscopy to obt…
Nanotube sheets, or “bucky papers,” have been proposed for use in actuating, structural and electrochemical systems, based in part on their potential mechanical properties. Here, we present results of detailed simulations of networks of nanotubes/ropes, with special emphasis on the effect of joint morphology. We perfo…
Quantum Stark effect in semiconductor nanocrystals is theoretically investigated, using the effective mass formalism within a $4\ifmmode\times\else\texttimes\fi{}4$ Baldereschi-Lipari Hamiltonian model for the hole states. General expressions are reported for the hole eigenfunctions at zero electric field. Electron an…
In order to search for the magnetic ground state of surface nanostructures we extended first principles adiabatic spin dynamics to the case of fully relativistic electron scattering. Our method relies on a constrained density functional theory whereby the evolution of the orientations of the spin-moments results from…
It is well known that the α-relaxation of each component in a miscible mixtures of two glass-formers has its own dynamics, which change with the composition of the blend. Lesser known are the corresponding change of the Johari-Goldstein (JG) β-relaxation and its relation to the α-relaxation. Previously, in neat glass-…
The particle flux through a two micron diameter orifice into vacuum from a source chamber filled with solid He exhibits a striking periodic behavior similar to that of a geyser. This phenomenon is attributed to a periodic collapse of the solid inside the source induced by the accumulation of excess vacancies injected…
We present direct evidence for the contribution of local orbital moments to the damping of magnetization precession in magnetic thin films. Using x-ray magnetic circular dichroism (XMCD) characterization of rare-earth (RE) M$_{4,5}$ edges in Ni$_{81}$Fe$_{19}$ doped with $<$ 2% Gd and Tb, we show that the enhancement…