Materials Literature
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Qualitative residual stresses in current environmental barrier coatings (EBCs) were inferred from the curvature of EBC‐coated SiC wafers, and the effects of EBC stresses on the durability of EBC‐coated SiC were evaluated. The magnitude of substrate curvature correlated fairly well with the EBC–SiC coefficient of therm…
Iron oxide nanoparticles were prepared using the sol–gel process. In situ polymerization of a pyrrole monomer in the presence of oxygen in an iron oxide–ethanol suspension resulted in an iron oxide polypyrrole nanocomposite. The structure and magnetic properties of the nanocomposites with varying pyrrole concentration…
The optical and vibrational properties of bare and CdS shelled CdSe nanocrystalline particles are investigated. To confirm the formation of such nanocrystals in our samples we estimate their average particle sizes and size distributions using TEM measurements. From the line profile analysis of the HRTEM images the cor…
α ‐ Al 2 O 3 nanopowders with mean particle sizes of 10, 15, 48, and 80 nm synthesized by the doped α‐Al 2 O 3 seed polyacrylamide gel method were used to sinter bulk Al 2 O 3 nanoceramics. The relative density of the Al 2 O 3 nanoceramics increases with increasing compaction pressure on the green compacts and decreas…
Polyelectrolyte multilayers were constructed from poly(styrenesulfonate), PSS, and poly(diallyldimethylammonium) with regularly interspersed layers of deuterated PSS. Annealing, by salt, of the fuzzy internal layering within this multilayer was followed using neutron reflectometry. A “limited source” diffusion model f…
We demonstrate a new, versatile class of nanoscale chemical sensors based on single-stranded DNA (ss-DNA) as the chemical sensors recognition site and single-walled carbon nanotube field effect transistors (swCN-FET) as the electronic read-out component. swCN-FETs with a nanoscale coating of ss-DNA respond to gas odor…
We calculate the Coulomb interaction induced density, temperature and magnetization-dependent many-body band-gap renormalization in a typical diluted magnetic semiconductor ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ in the optimally doped metallic regime as a function of carrier density and tempera…
The spin-excitations of a fractional quantum Hall system are evaluated within a bosonization approach. In a first step, we generalize Murthy and Shankar's Hamiltonian theory of the fractional quantum Hall effect to the case of composite fermions with an extra discrete degree of freedom. Here, we mainly investigate the…
Nickel sulfide and copper sulfide nanocrystals were synthesized by adding elemental sulfur to either dichlorobenzene-solvated (copper sulfide) or oleylamine-solvated metal(II) precursors (nickel sulfide) at relatively high temperature to produce the metal sulfide. Nickel sulfide nanocrystals are cubic Ni(3)S(4) (polyd…
In this communication, we demonstrate a novel coordination-based strategy to the fabrication of submicrometer-scale, monodisperse, spherical colloids of organic-inorganic hybrid materials, carried out by mixing H2PtCl6 and p-phenylenediamine (PPD) aqueous solutions at room temperature. The particle size and polydisper…
We study interface thermal resistance (ITR) in a system consisting of two dissimilar anharmonic lattices exemplified by the Fermi-Pasta-Ulam and Frenkel-Kontorova models. It is found that the ITR is asymmetric; namely, it depends on how the temperature gradient is applied. The dependence of the ITR on the coupling con…
Tasty tubes: Multiwalled carbon nanotubes functionalized with fluorescein isothiocyanate and amphotericin B (AmB) have been shown to be rapidly internalized by mammalian cells (see picture) without the toxic effects typically displayed upon treatment with AmB. Furthermore, the modified drug exhibits a higher antifunga…
Mesoporous SBA-15 materials were functionalized with amine groups through postsynthesis and one-pot synthesis, and the resulting functionalized materials were investigated as matrixes for controlled drug delivery. The materials were characterized by FTIR, N(2) adsorption/desorption analysis, zeta potential measurement…
Titanium and Titanium alloys are widely used as an orthopedic and dental implant material because of their excellent biocompatibility and mechanical strength. In this study, ECAP Cp-Ti and Cp-Ti were heat treated for different annealing time of 30 min, 90 min and 3 hours. The grain size for each condition was studied.…
The science and technology of dielectric materials—a strong topic in physics, chemistry, and electrical engineering—has been pursued for well over 100 years. At present, dielectric materials have wide applications throughout the electronics, microwave, communication, and aerospace industries. Silicon dioxide has been…
Although protein crystallization is a unit operation with potentially high separation factors, it has not been widely used in industry. Protein crystallization studies and practices have hitherto been largely limited to crystallography protocols. Knowledge of the behaviour of protein in solution would help to overcome…
In this paper, a study is made for the size effects on the effective Young's modulus of nano crystal copper wires. On the basis of numerical results of molecular dynamics simulation, the inhomogeneous property of the nano wires is taken into account so that the continuum model of either a rod or a beam is constructed…
We consider phase field models with the objective of approximating sharp interface models. By using second order asymptotics in the interface thickness parameter, $\epsi$, we develop models in which the order $\epsi$ term is eliminated, suggesting more rapid convergence to the $\epsi$ = 0 (sharp interface) limit. In a…
We have developed a fast, low power heat switch for switching a niobium thin film between the normal and superconducting state. The sputtered niobium film (400 nm thick, 100 /spl mu/m wide) has a critical current density of 5/spl times/10/sup 10/ Am/sup -2/. Switching is produced by joule heating a small section of th…
High-density plasma chemical-vapor deposition phosphosilicate glass (PSG) films were evaluated for the application of premetal dielectric materials. The PSG films were deposited using phosphorous-related precursors reacted with silane and oxygen at a temperature ⩽550°C. The as-deposited films were subsequently furnace…