Materials Literature
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The synthesis and characterization of 1-3-nm diameter, structurally well-defined, bimetallic AuAg dendrimer-encapsulated nanoparticles (DENs) are reported. Three different bimetallic structures were examined: AuAg alloys synthesized by cocomplexation and subsequent reduction of dendrimer-encapsulated Au3+ and Ag+ and…
We have found a remarkable increase (up to 60%) of the dielectric constant with the onset of magnetic order at $42\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in the metastable orthorhombic structures of $\mathrm{Y}\mathrm{Mn}{\mathrm{O}}_{3}$ and $\mathrm{Ho}\mathrm{Mn}{\mathrm{O}}_{3}$ that proves the existence of a stron…
Controlling fabrication of mono-dispersed and well-aligned arrays of one-dimensional (1D) nanostructures, nanowires or nanotubes, will benefit a lot for the investigation of their physical properties and their potential use in nanolasers, chemical and biological sensors, and nanoelectrode arrays for solar energy conve…
Abstract Beginning with work by U. von Barth and L. Hedin in 1972 and continuing with recent papers in 2001 by K. Capelle and G. Vignale and by H. Eschrig and W. E. Pickett, questions have been raised about the meaning and validity of Hohenberg–Kohn theory when spin magnetism and/or magnetic fields are present. This a…
Surface-nitrogen removal steps were analyzed in the course of a catalyzed NO + H(2) reaction on Pd(110) by angle-resolved mass spectroscopy combined with cross-correlation time-of-flight techniques. Four removal steps, i.e., (i) the associative process of nitrogen atoms, 2N(a) --> N(2)(g), (ii) the decomposition of th…
Physical vapor deposition can be used to synthesize sculptured thin films with high surface areas. Highly directional vapor deposition onto a tilted, rotating substrate has been shown to produce nanostructured materials with controlled columnar features, including zig-zag, cusp, chevron, and helical geometries. Nanopo…
Abstract An arbitrary Lagrangian–Eulerian (ALE) finite element method is described for the solution of three‐dimensional free‐surface flow problems. The focus of this work is on extending the algorithm to include a dynamic contact line model allowing the fluid free surface, in the steady case, to form a prespecified s…
Grain bridging degradation behind a crack tip is the main cyclic fatigue mechanism in nontransforming ceramics. In this work, a compliance function is used to quantify the shielding capacity of grain bridges during cyclic loading of alumina ceramics with different grain sizes. This allows to identify the different sta…
The study of the ac properties of nano-electronic systems is still in its infancy. In this paper we present an overview of recent work aimed at advancing the understanding of this new field. Specifically, we first discuss the passive RF circuit models of one-dimensional nanostructures as interconnects. Next, we discus…
The synthesis, crystal structure, and magnetic properties of a one-dimensional compound, {[Mn(hfac)2]2(biradical)}n (1), resulting from the coordination of bis(hexafluoroacethylacetonato)manganese(II) [Mn(hfac)2] with a biradical obtained by grafting two nitronyl nitroxide radicals in the 5 and 5' positions of a 2,2'-…
Engineering of clay nanocomposite materials by modification of their surfaces can enable the control of retention, transport, and persistence of toxic chemicals in the geosystem. The properties and interactions of clay nanocomposites have been widely studied, but little information exists on their microstructure at a…
The dynamic miscibility of poly(4-vinylphenol)/poly(vinyl ethyl ether) (PVPh/PVEE) blends, with a T g contrast of 186 K, as well as the PVEE segmental dynamics have been investigated by temperature- and pressure-dependent dielectric spectroscopy. In PVEE the pressure coefficient of T g amounts to 0.215 K/MPa, and its…
We give a brief overview of the development and recent progress of a new technology, silicon dislocation-engineered light-emitting diodes (LEDs). The dislocation-engineering method enables the development of light emitters in conventional silicon technology. Key and probably unique to this approach is its genuine and…
Photocytotoxisch und stabil ist das polymere Micellensystem, das in wässrigem Medium durch elektrostatische Assoziation aus einem anionischen dendrimeren Porphyrin und einem Polyethylenglycol-Poly(L-lysin)-Blockcopolymer entsteht (siehe Bild). Wegen seiner hydrodynamischen Größe (ca. 60 nm) sollte sich dieses polymere…
From silver nanocubes to nanotubes through nanospheres, nanotriangles, and nanowires. All these morphologies, as depicted in the TEM and SEM images in the cover picture, have been achieved by means of shape‐controlled synthesis. The polymer‐mediated polyol process is also depicted; through careful control of certain e…
Lanthanum cobaltite (LaCoO 3 ) thin films were synthesized by an innovative route based on the combination of chemical vapor deposition (CVD) and sol−gel (SG) methods. In particular, the approach is based on the sequential deposition of binary oxide systems (Co−O on La−O) and on the ex situ thermal treatment of the fi…
A family of organic-inorganic wheel-and-axle diols (Pd(LOH)(2)Cl(2), Pd(LOH)(2)(CH(3))Cl, Pd(LOH)(2)(CH(3)COO)(2), LOH = alpha-(4-pyridyl)benzhydrol) and several corresponding solvates are synthesized and characterized by single-crystal X-ray diffraction analysis. Their structures are compared to investigate the facto…
Poly (methyl methacrylate) -- PMMA -- and poly (methacryloyl chloride) -- PMACl -- were synthesized by free radical solution polymerization. The thermal stabilities of these polymers were determined with the help of thermogravimetry and differential thermal analysis. The structural changes in these materials at differ…
We have fabricated and characterized surface-emitting, spin-polarized light-emitting diodes with a Mn-doped InAs dilute magnetic quantum dot spin-injector and contact region grown by low-temperature molecular beam epitaxy, and an In(0.4)Ga(0.6)As quantum dot active region. Energy-dispersive X-ray and electron energy l…
In this paper report on the synthesis of copper and zinc sulfide nanocrystals (NCs) via the formation of polymetallic thiolate cages. Cu2S NCs derived from Cu–dodecanethiol complex formed well-defined spherers, which were sufficiently monodisperse (with a size distribution of ∼10% standard deviation of approximately 4…