Materials Literature
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Abstract Raman spectra of starting (pristine) and functionalized multiwalled carbon nanotubes (MWNTs) were analyzed by principal component analysis (PCA) because the original Raman spectra showed very little differences between them. The nanotubes were functionalized with amines: dodecylamine (MWNT1), nonylamine (MWNT…
We have performed nuclear magnetic resonance (NMR) measurements on gallium confined in opal. In a cooling process, between 260 and $220\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the NMR spectra of gallium in opal exhibit two separate peaks at $\ensuremath{\sim}122.579\phantom{\rule{0.2em}{0ex}}48$ (low frequency, LF) and…
Here the wetting of ionic and nonionic surfactant solutions on a superhydrophobic interface, obtained by using a mixed inorganic-organic coating providing a fractal-like structure, has been investigated to define the role of adsorption at these interfaces. The presence of the amphiphilic molecules is effective in lowe…
In this study, the authors demonstrate the ability to apply precise, conformal W coatings onto all surfaces of nanoporous carbon aerogels using atomic layer deposition (ALD). The resulting material has a filamentous structure in which the W completely encapsulates the carbon aerogel strands. The material mass increase…
Point contact Andreev reflection measurements of Co2Cr1−xFexAl Heusler alloys showed that the spin polarization P decreases with x from P=0.62 for x=0.0toP=0.54 for x=0.4 and then increases slightly to P=0.56 for x=1.0. The deviation in P of the samples with x=0.0 and 0.4 from the theoretical predictions (P>0.9…
This letter reports on the performance improvement of phase-change memory (PCM) cells by applying silicon-germanium (SiGe) alloys as resistive heating layers. The in situ doped polycrystalline Si0.75Ge0.25 films, lying under holes filled with a Ge2Sb2Te5 (GST) phase-change material in a pore-style configuration, promo…
Single crystals of TiO(2) rutile doped with Cr, Mn, Fe, Co, Ni, and Cu were grown with the flux method in a Na(2)B(4)O(7) melt. The samples, checked in their structural and phase homogeneity by x-ray diffraction and micro-Raman spectroscopy, were single-phase needle-shaped crystals several millimetres long. Paramagnet…
The effect of texture with (100) and (110) preferred orientations on dielectric properties of Ba0.6Sr0.4TiO3 (BST) thin films grown on SrO (9nm) and CeO2 (70nm) buffered Si substrates, respectively, was investigated. The coplanar waveguide (CPW) phase shifter using (100) oriented BST films on SrO buffered Si exhibited…
The magnetocaloric effect (MCE) in fine grained perovskite manganites of the type La(1-x)K(x)MnO(3) (0<x<0.15) prepared by a pyrophoric method has been investigated. Potassium addition in lanthanum manganite enhances the Curie temperature (T(C)) of the system from 260.4 K (x = 0.05) to 309.7 K (x = 0.15). A large magn…
ZnO homojunction light-emitting diode was grown on single-crystal GaAs (100) substrate by ultrasonic spray pyrolysis. This diode was comprised of N–In codoped p-type ZnO and unintentionally doped n-type ZnO film. Ohmic contact on n-type ZnO layer and GaAs substrate was formed by Zn∕Au and Au∕Ge∕Ni alloyed metal electr…
Abstract Summary: The thermal degradation and carbonization of poly(1,3‐cyclohexadiene) (PCHD) with a controlled polymer chain, and its soluble dehydrogenated derivatives are reported for the first time. For PCHD, thermogravimetric (TG) analysis revealed a three‐stage thermal degradation. PCHD was completely decompose…
Numerous theoretical and numerical works have been devoted to the study of the algebraic decrease at large times of the velocity autocorrelation function of particles in a fluid. The derivation of this behavior, the so-called long-time tail, generally based on linearized hydrodynamics, makes no reference to any specif…
Abstract Functional polyurethane surfactants (di‐block and tri‐block) were synthesized by addition polymerization of 2,4‐toluenediisocyanate with poly(propylene oxide) and monoallyl‐end‐capped poly(ethylene oxide). The chemical structure of the polyurethane surfactants was confirmed by Fourier transform infrared and 1…
Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005
Bi-doped ZnO films were grown on Si (111) substrates by molecular-beam epitaxy. X-ray photoelectron spectroscopy and diffraction measurements reveal that Bi was incorporated into ZnO films without any phase separation. Room-temperature Hall effect measurements show a significant reduction of electron concentration and…
First-principles calculations have been performed to study the ground states of both neutral and anionic ${\mathrm{Al}}_{12}X$ ($X=\mathrm{Si}$, Ge, Sn, Pb) clusters. We find that both neutral and charged ${\mathrm{Al}}_{12}\mathrm{Si}$ cluster prefer icosahedral structure, in agreement with previous calculations. How…
Methods for synthesis and the structures of high spin polynuclear carboxylate complexes of divalent manganese and iron are considered.
The authors report the fabrication of p-n junctions, consisting of p-type La0.7Sr0.3MnO3 (LSMO) and either n-type ZnO grown on sapphire or n-type Si substrates. The LSMO/ZnO junction exhibits excellent rectifying behavior over the temperature range of 77–300K with breakdown voltage less than −10V. LSMO/Si displayed p-…
Highly fluorescent nanofibers were prepared by electrospinning the solutions containing poly(p-phenylene vinylene) (PPV) precursor and poly(vinyl pyrrolidone), followed by thermal conversion. Different morphologies from uniform helical to ultrathin straight ones were controllably prepared by adjusting the amount of PP…
Capillary force assembly (CFA) of colloidal particles usually results in closed-packed films or particle aggregation within topographic features. In this work, it is shown that CFA can also be exploited to both localize and separate nanoparticles (d=50–200nm) when template shape and wettability are controlled. Well-de…