Materials Literature
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Carbon nanotubes show great promise for applications ranging from nanocomposites, nanoelectronic components, nanosensors, to nanoscale mechanical probes. These materials exhibit very attractive mechanical properties with extraordinarily high stiffness and strength, and are of great interest to researchers from both at…
Relaxation dynamics of ${\mathrm{Ag}}^{+}$ ions and scaling of the conductivity spectra in lead bismuthate glasses of different compositions have been investigated in the frequency range from 10 Hz to 2 MHz and in the temperature range from 83 K to just below glass transition temperature. We have observed that relaxat…
Insulin crystals suitable for cryogenic data collection and structure determination by single-wavelength anomalous scattering (SAS) were obtained by a self-optimization screening process in a single capillary tube without manipulation of the crystals at any time. Using the counter-diffusion crystallization technique,…
Heat capacities of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ and ${\mathrm{HfW}}_{2}{\mathrm{O}}_{8}$ were precisely measured between 1.8 and 330 K. Heat-capacity curves of ${\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ and ${\mathrm{HfW}}_{2}{\mathrm{O}}_{8}$ are very similar to each other. The heat capacity of ${\mathrm{HfW}}_{2}{…
There is a growing interest in utilizing renewable resources and exploiting biological reactions for environmentally friendly products and processes. We report the use of the enzyme tyrosinase to graft the natural phenol, catechin, onto the biopolymer chitosan. Chemical evidence for grafting was obtained by UV/visible…
The structure, luminescence spectroscopy, and lifetime decay dynamics of Eu 2 O 3 nanoparticles formed in MCM-41 have been investigated. Both X-ray diffraction and high-resolution transmission electron microscopic observations indicate that Eu 2 O 3 nanoparticles of monoclinic structure are formed inside channels of M…
We present photoelectron spectroscopy investigations of in-situ prepared AgO. The sample was prepared by room temperature oxidation of Ag in an electron cyclotron resonance ${\mathrm{O}}_{2}$ plasma. In contrast to other measurements based on ex situ prepared AgO powder samples, our investigations show a distinct doub…
We present a theoretical survey of ferromagnetic transition temperatures in cubic (III,Mn)V semiconductors based on a model with $S=5/2$ local moments exchange coupled to itinerant holes in the host semiconductor valence band. Starting from the simplest mean-field theory of this model, we estimate the ${T}_{c}$ enhanc…
We have fabricated air-stable n-type, ambipolar carbon nanotube field effect transistors (CNFETs), and used them in nanoscale memory cells. N-type transistors are achieved by annealing of nanotubes in hydrogen gas and contacting them by cobalt electrodes. Scanning gate microscopy reveals that the bulk response of thes…
Analysis with the characteristic functional of stochastic motion is used for the gradient spin echo measurement of restricted motion to clarify details of the diffraction-like effect in a porous structure. It gives the diffusive diffraction as an interference of spin phase shifts due to the back-flow of spins bouncing…
Direct phonon spin-lattice relaxation of an electron qubit bound by a donor impurity or quantum dot in SiGe heterostructures is investigated. The aim is to evaluate the importance of decoherence from this mechanism in several important solid-state quantum computer designs operating at low temperatures. We calculate th…
First order Raman spectra in the region 200–800 cm−1 have been collected for AMn2O4 (A = Mn, Mg and Zn) tetragonal spinels. A possible correlation between Raman phonons and AO4 and MnO6 unit vibrations is proposed. Structural changes have been analyzed following the evolution of the Raman spectra with x for the Mg1−xM…
The magnetic and transport properties of the Cr-doped manganites ${\mathrm{La}}_{0.46}{\mathrm{Sr}}_{0.54}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Cr}}_{y}{\mathrm{O}}_{3}$ ( $0\ensuremath{\le}y\ensuremath{\le}0.08$) with the $A$-type antiferromagnetic structure were investigated. Upon cooling, we find multiple magnet…
A three-dimensional discrete dislocation dynamics plasticity model is presented. The approach allows realistic boundary conditions on the specimen, as both stress and displacement fields of the dislocations are incorporated in the formulation. Emphasis is placed on various technical details in the formulation as well…
The fracture of carbon nanotubes is studied by molecular mechanics simulations. The fracture behavior is found to be almost independent of the separation energy and to depend primarily on the inflection point in the interatomic potential. The fracture strain of a zigzag nanotube is predicted to be between 10% and 15%,…
Monodisperse magnetite nanoparticles have been synthesized by high-temperature solution-phase reaction of Fe(acac)3 in phenyl ether with alcohol, oleic acid, and oleylamine. Seed-mediated growth is used to control Fe3O4 nanoparticle size, and variously sized nanoparticles from 3 to 20 nm have been produced. The as-syn…
The Idaho National Engineering and Environmental Laboratory (INEEL) Advanced Test Reactor (ATR), a DOE Category A reactor, was designed to provide an irradiation test environment for conducting a variety of experiments. The ATR Safety Analysis Report, determined by DOE to meet the requirements of 10 CFR 830, Subpart B…
Abstract 1 H wideline and 13 C magic‐angle spinning NMR have been used to study the morphology and dynamics of latex‐cast and solution‐cast film blends of natural rubber (NR) and a polyurethane (PU) based on poly(ϵ‐caprolactone) diol and isophorone di‐isocyanate. 1 H T 1 and T 1ρ relaxation times have been measured, a…
Abstract The lower critical solution temperature (LCST) properties and hydrolytic behaviour of thermosensitive biodegradable polyphosphazenes with monomethoxy‐poly(ethylene glycol), glycine ethyl ester and depsipeptide ethyl esters substituents have been studied. All the polymers synthesized show LCST properties. The…
[reaction: see text] The first synthesis of dendralene-type TTF derivatives bearing a 1,3-ditellurole ring has been achieved. Preliminary electrochemical results are presented.