Materials Literature
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Complete oxidation of ethylene was performed over supported noble metals or transition metals oxide catalysts and on monoliths under atmospheric pressure. Gold nanoparticles on Al2O3 or MxOy(M = Mo, Fe, Mn) were prepared by impregnation, coprecipitation, deposition, and dispersion methods. Nanoparticles prepared by im…
Hydrogenated and unhydrogenated Si-nanocrystal/Si dioxide (Si-nc/SiO2) composites were obtained from SiyO1-y(y=0.36,0.42) thin films deposited by plasma-enhanced chemical vapor deposition. The unhydrogenated composites were fabricated by promoting the Si precipitation through the thermal annealing of the films in the…
Abstract: The surface of mercapto-functionalized mesoporous silica having a highly ordered open pore net-work was modified into a super-hydrophilic surface through a stepwise sulfonation process involving oxida-tion and ionization reactions. The initial mesoporous silica was prepared using an acid-catalyzed sol-gel re…
Abstract A new approach for the preparation of organic/inorganic nanocomposites was investigated in which nano‐sized silica particles without surface modification were dispersed by the mechanical smashing of strength‐controlled porous silica agglomerates in molten resin during direct melt‐compounding. The method consi…
Electron beam-induced deposition (EBID) provides a simple way to fabricate submicron- or nanometer-scale structures from various elements in a scanning electron microscope (SEM). The growth rate and shape of the deposits are influenced by many factors. We have studied the growth rate and morphology of EBID-deposited n…
The mesomorphic behavior and phase structure were examined in the mixture of two kinds of dimeric compounds, alpha,omega-bis(4-alkoxyanilinebenzylidene-4'-carbonyloxy)pentane (mOAM5AMOm), by optical microscopy, X-ray diffraction, polarization switching, and second-harmonic generation measurements. One compound is 4OAM…
The kinetics of assembly of a series of poly(2-vinylpyridine)−polystyrene−poly(2-vinylpyridine) (PVP- b -PS- b -PVP) triblock copolymers from the selective solvent toluene onto a silicon surface has been studied using phase-modulated ellipsometry. The adsorbed amount and thickness have been determined independently as…
Narrow W lines with linewidths down to ~40 nm were manufactured by both damascene and subtractive processing. The dependence of the resistivity on the linewidth was studied for different deposition temperatures of the W layer. Generally, the resistivity decreases for decreasing deposition temperature of W. The resisti…
The thermoelectric properties of doped half-Heuslers, NbCoSn 1- x Sb x and Nb 0.99 Ti 0.01 CoSn 1- x Sb x , have been studied in the temperature range from 320 to 850 K. These half-Heuslers are synthesized by the arc melting of pure metals followed by annealing for one week at 1123 K in vacuum. The samples with x =0,…
Nanocrystalline diamond films were grown on silicon substrates by microwave plasma enhanced chemical vapor deposition with 1% methane, 2%–10% hydrogen, and argon. High resolution transmission electron microscope images and selected area electron diffraction patterns confirm that the films consist of 10–20nm sized diam…
We have performed molecular dynamics simulations of blends composed of chemically realistic (CR) and lower barrier (LB) 1,4-polybutadiene (PBD) over a wide range of composition and temperature. In these blends, the dynamically fast component (LB-PBD, T g ≈ 108 K) and dynamically slow component (CR-PBD, T g ≈ 164 K) ar…
The gold standard conduit for bypass of diseased small-diameter arteries remains autologous vascular tissue. In the absence of such tissue, patients are offered bypass with prosthetic material, with far less durable results. Vascular tissue engineering, the creation of a vascular conduit by seeding a tubular scaffold…
A complete set of elastic, piezoelectric and dielectric properties of a [111]-poled single-domain Pb(Zn 1/3 Nb 2/3 )O 3 –(6–7)%PbTiO 3 , or PZN–(6–7)%PT, single crystal have been determined by means of a combination of resonance and quasi-static measurement techniques. The present work shows that the d 15 value determ…
An array of high-density 1.8×10 12 cm -2 floating nanodots was embedded within a metal–oxide–semiconductor (MOS) capacitor using a cage-shaped protein supramolecule, Listeria ferritin (Lis-fer). A monolayer of Lis-fer with a 4.5 nm ferrihydrite core was adsorbed on a 3 nm tunneling SiO 2 layer on a p-Si substrate by 3…
The issue of the heterogeneity of boron doping in microcrystalline diamond films was addressed by four different methods: micro-Raman spectroscopy and Raman imaging, Kelvin probe force microscopy, conducting atomic force microscopy, and scanning electrochemical microscopy. The samples were commercially available films…
Carbon nanotubes (CNTs) offer unique properties such as highest current density exceeding 10 9 A/cm 2 , ultra-high thermal conductivity as high as that of diamond, ballistic transport along the tube and extremely high mechanical strength with high aspect ratio of more than 1000. Because of these remarkable properties,…
Abstract One of the conventional methods to develop biodegradable plastics at a reasonable cost is manufacturing the blend of expensive polycaprolactone (PCL) and lower‐priced starch. However, past studies have shown that the amount of starch blended with plastics is relatively small and the dynamic properties are not…
In this work, antiwear nanoimprint templates were made by depositing and patterning diamondlike carbon (DLC) films on Si and quartz. A capacitively coupled plasma enhanced chemical vapor deposition (PECVD) system was configured to deposit 100nm–1μm thick DLC films on Si and quartz substrates. These films were characte…
The effects of both single doping and simultaneous codoping on the structural, electronic, and optical properties of Si nanocrystals are calculated by the first-principles method. We show that the amount of the nanocrystal relaxation around the impurity is directly related to the impurity valence. Moreover, both the n…
Rib-loaded waveguides containing Er3+-coupled Si nanoclusters (Si-nc) have been produced to observe optical gain at 1535 nm. The presence of Si-nc strongly improves the efficiency of Er3+excitation but may introduce optical loss mechanisms, such as Mie scattering and confined carrier absorption. Losses strongly affect…