Materials Literature
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Anodization of titanium in a fluorinated dimethyl sulfoxide (DMSO) and ethanol mixture electrolyte is investigated. The prepared anodic film has a highly ordered nanotube-array surface architecture. Using a 20 V anodization potential (vs Pt) nanotube arrays having an inner diameter of 60 nm and 40 nm wall thickness ar…
We survey results of computer simulations for the structure and dynamics of supercooled polymer melts and films. Our survey is mainly concerned with features of a coarse grained polymer model—a bead–spring model—in the temperature regime above the critical glass temperature T c of the ideal mode-coupling theory (MCT).…
Here we investigate the kinetics of water-assisted CVD (henceforth denoted as supergrowth CVD) by a quantitative time-evolution analysis based on a simple growth model. We found that the supergrowth can be well described by a model where the dynamics of the catalyst activity is treated similar to radioactive decay. An…
A simple, chip-based implementation of a double-beam interferometer that can separate biomolecules based on size and that can compensate for changes in matrix composition is introduced. The interferometric biosensor uses a double-layer of porous Si comprised of a top layer with large pores and a bottom layer with smal…
Positively charged nanosheets with a lateral dimension of micrometers have been synthesized by directly delaminating a well-crystallized Mg−Al layered double hydroxide (LDH) in the nitrate form. The action of formamide on LDH crystals 10 μm in size led to a transparent solution. X-ray diffraction measurement on a glue…
Abstract The galvanic replacement reaction between a Ag template and HAuCl 4 in an aqueous solution transforms 30–200 nm Ag nanocubes into Au nanoboxes and nanocages (nanoboxes with porous walls). By controlling the molar ratio of Ag to HAuCl 4 , the extinction peak of resultant structures can be continuously tuned fr…
Neutron diffraction studies confirm that La2NiMnO6 is ferromagnetic with moments on Ni and Mn indicating NiII and MnIV (small and large spheres, respectively, in Figure). Electrical resistivity measurements show semiconducting behavior with a room temperature conductivity of ∼102 Ω cm and very high resistivity at low…
We derive a microscopic equation of motion for the dynamical orientational correlators of molecular crystals. Our approach is based upon mode coupling theory. Compared to liquids we find four main differences: (i) the memory kernel contains Umklapp processes if the total momentum of two orientational modes is outside…
The structures of the cubic ${\ensuremath{\alpha}}^{\ensuremath{'}}\text{\ensuremath{-}}{\mathrm{Al}}_{71.7}{\mathrm{Si}}_{7}{\mathrm{Cu}}_{3.8}{\mathrm{Fe}}_{17.5}$ and $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{55}{\mathrm{Si}}_{7}{\mathrm{Cu}}_{25.5}{\mathrm{Fe}}_{12.5}$ phases, $1∕1$ approximants of $…
The structure of ternary compounds involving alkali, tetrahydrofuran (THF) and single-walled carbon nanotubes have been investigated using neutron diffraction (ND). Hydrogen-deuterium substitution in THF, as well as the study of different alkali-based compounds, allow a layered structure around the nanotubes to be det…
Reactive core–shell nanoparticles are prepared in aqueous media by the addition of a solution of an amphiphilic organic polymer and a metal oxide precursor. The nanoparticles are thought to form by nucleation, with a core–shell structure forming later. Using acid catalysis the precursor is converted to metal oxide by…
As IC performance increases, many technical challenges appear in the areas of power delivery, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of aligned carbon nanotubes (CNTs) is proposed in IC packaging as electrical interconnect and thermal interface materials…
Transparent magnetic glass‐ceramics were produced by infiltrating nano‐porous glass with nitrate salts and firing. The resultant glass‐ceramics contained spinel ferrite nanocrystals that exhibited ferromagnetic and superparamagnetic behavior depending on composition and firing temperature. Transparency in the near inf…
North Carolina State University Theses Textile Engineering, Chemistry and Science.
The field dependencies of biradical recombination probability in the presence of paramagnetic species with spins S(3) = 1 and S(3) = (1)/(2) have been calculated in the framework of the density matrix formalism. To describe the effect of the "third" spin on the spin evolution in biradical, we have also considered the…
A three-dimensional electrothermal model has been developed to investigate the spatial resolution of the scanning thermoelectric microscopy (SThEM). We found that if the electrical resistivity of the sample changes abruptly, the SThEM will measure a voltage close to the local thermoelectric voltage where electrical re…
Imaging and spectroscopy of individual CdSe nanocrystals have been performed with the scanning tunneling microscope (STM) on atomically resolved hydrogenated Si(100) surfaces. The CdSe nanocrystals have been deposited under vacuum onto the surface by using the pulse valve method. Two different types of CdSe nanocrysta…
CdSe/poly(butyl acrylate) nanocomposites were synthesized by in situ miniemulsion polymerization. The hybrid nanomaterial is very stable and presents a bright green photoluminescence at 2.29 eV under ultraviolet excitation. With the excitation conditions used the intensity of the emission band keeps nearly constant fr…
A theoretical model for the prediction of interfacial behaviour is successfully developed for composites with pre-strained shape memory alloy (SMA) fiber. A two-cylinder model with a thin SMA fibre surrounding by epoxy matrix is employed for a pull-out test. The material constants and thermomechanical properties of th…
Highly electron-doped cobaltites of the system ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ce}}_{x}\mathrm{Co}{\mathrm{O}}_{3}\phantom{\rule{0.3em}{0ex}}(0.1\ensuremath{\leqslant}x\ensuremath{\leqslant}0.4)$ are synthesized by the growth of epitaxial thin films using pulsed laser deposition. Ferromagnetic order is obser…