Materials Literature
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Abstract High‐density polycrystalline samples (above 98% of the theoretical density) of Ag 8 GeTe 6 were prepared by solid‐state reactions of Ag 2 Te, GeTe, and Te, followed by hot‐pressing. The thermoelectric properties were measured at temperatures ranging from room temperature to around 700 K. The thermal conductiv…
The primary excited state absorption processes relating to the I65→I75 3μm laser transition in singly Ho3+-doped fluoride glass have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the I65 and I75 energy levels established the occurrence of two excited state abs…
Although silver nanoparticles are excellent surface enhancers for Raman spectroscopy, their use to probe the conformation of large proteins at interfaces has been complicated by the fact that many polypeptides adsorb weakly or with a random orientation to colloidal silver. To address these limitations, we sought to in…
The electrical, structural, and chemical properties of twisted yarns of metal-oxide nanofibers, fabricated using a modified electrospinning technique, are investigated in this report. In particular, synthesized zinc oxide and nickel oxide yarns having diameters in the range of 4–40μm and lengths up to 10cm were charac…
The effect of chemical treatment on physical and chemical properties, i.e., pore diameter, porosity, specific surface area, and chemical bonding of electrochemically formed mesoporous silicon were investigated by using of nitrogen sorption isotherm, scanning electron microscopy, and Fourier transform infrared spectros…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTOptimization of Organotellurium Transfer Agents for Highly Controlled Living Radical PolymerizationEiichi Kayahara†, Shigeru Yamago*‡, Yungwan Kwak‡, Atsushi Goto‡, and Takeshi Fukuda‡View Author Information Division of Molecular Ma…
La 0.60 Sr 0.40 MnO 3 (LSMO) thin films of varying thickness from 12 to 55 nm were deposited using the pulsed-laser deposition technique onto single-crystalline SrTiO3 (STO) and STO-buffered Si substrates. The Tc of LSMO films grown on STO-buffered Si substrates decreases faster than films directly grown on STO with d…
The ultrafast lasing dynamics of single zinc oxide nanowires are studied by time-resolved upconversion of the lasing emission as a function of the ultraviolet excitation intensity. Induction times for stimulated emission in individual nanowires are observed to be 1−5 ps or 3−15 roundtrips for nominal 20 μm long nanowi…
We present an ab initio density functional theory study of the magnetic moments that arise in graphite by creating single carbon vacancies in a three-dimensional (3D) graphite network using full potential, all electron, spin polarized electronic structure calculations. In previous reports, the appearance of magnetic m…
The growth of ZnS nanoparticles during precipitation from aqueous solution is studied by in situ stopped-flow UV absorption spectroscopy at temperatures between 283 and 323 K. Particle growth is marked by substantial ripening during the first 60 ms. Kinetic data suggest that a ripening mechanism by coalescence (orient…
Binding of ligands on to epidermal growth factor receptor (EGFR) can stimulate cell growth; therefore, any application employing EGF as a targeting ligand for a "drug carrier" must evaluate the effect of the conjugate on cell growth. We report the synthesis and in vitro biological activity of EGF molecules coupled to…
Superhydrophobic surfaces are gaining considerable interest in a lot of different applications, and nonetheless, precise control over the wettability properties of such surfaces is still a challenge due to difficulties when controlling the effects independently induced on superhydrophobicity by the chemical and topolo…
The endothelization of polymers using surface modification has received great attention. In particular, creation of physical surface features such as craters or pores has been an active area of research. However, there have been no reported studies of the effects of pore sizes (wide range) and interpore distance on en…
Abstract A study on surface modification of extended PTFE (polytetrafluoroethylene) foil after treatment in oxygen and nitrogen plasma is presented. PTFE was exposed to a weakly ionized, highly dissociated RF plasma with a high density of neutral atoms. The gas pressure was 75 Pa and the discharge power was 200 W. The…
The effects of K content on the dielectric, piezoelectric, and ferroelectric properties of 0.95(KxNa1−x)NbO3−0.05LiSbO3 (0.95KxNN−0.05LS) (x=0.25–0.75) lead-free piezoelectric ceramics prepared by conventional solid-state sintering were studied. The experimental results show that the dielectric, piezoelectric, and fer…
Recent theoretical studies have predicted a new clustering mechanism for soft matter particles that interact via a certain kind of purely repulsive, bounded potentials. At sufficiently high densities, clusters of overlapping particles are formed in the fluid, which upon further compression crystallize into cubic latti…
The temperature dependence of the ferroelectric hysteresis and capacitance in PbZrO3 epitaxial films with (120)O and (001)O orientations was investigated in the 4.2–400K temperature range. It was found that the films with (120)O orientation show a mixture of ferroelectric and antiferroelectric phases on the entire tem…
The preparation of nanoporous nickel films by electrochemical deposition of Ni−Cu alloy followed by the selective anodic etching of the less-active component (Cu) from the alloy was studied in an aqueous solution containing Cu(II) and Ni(II) at room temperature. Constant potential electrodeposition produced columnar N…
Phase transformations of crystalline Ge2Sb2Te5 films upon pulsed laser irradiation have been studied using in situ reflectivity measurements with temporal resolution. Two different configurations allowed point probing with nanosecond temporal resolution and imaging with subpicosecond temporal and micrometer spatial re…
Initiated chemical vapor deposition (iCVD) was used to coat the surfaces of high-aspect-ratio (∼80:1) pores with functional polymeric films ranging in thickness between 10 and 150 nm. X-ray photoelectron microscopy and electron microprobe analysis confirmed the presence of the polymer coating along the pore wall. Stat…