Materials Literature
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By performing specific heat measurements for a series of the ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ samples ($x=0.12$, 0.135, 0.155, 0.185, and 0.2) several intricacies of the phase diagram have been clarified. For all the samples, specific heat was measured over the temperature…
Ein Benetzer-Wechsel: Der Einfluss der Temperatur T auf die Position eines sterisch stabilisierten Polystyrol-Latexpartikels, das an einer Öl-Wasser-Grenzfläche adsorbiert ist, wurde untersucht. Durch solche Partikelmonoschichten stabilisierte Emulsionen sind bei niedriger Temperatur Öl-in-Wasser-, bei hoher Wasser-in…
A new synthetic route to hyperbranched polymers is developed. Polycyclotrimerizations of functional diynes 1 − 3 initiated by a simple base of piperidine lead to the formation of hyperbranched poly(aroylarylene)s P 1 −P 3 with perfect 1,3,5-regioregularity and high degree of branching (up to 100%) in high yields (up t…
We have investigated the transport properties of solid solutions of skutterudites based on $\mathrm{Co}{({\mathrm{Sb}}_{1\ensuremath{-}x}{\mathrm{As}}_{x})}_{3}$. Homogeneous solid solutions were prepared with As content $x\ensuremath{\leqslant}0.1$. The influence of point-defect scattering on the lattice thermal cond…
We show here that reaction of the fungus, Fusarium oxysporum, with the aqueous heavy-metal ions Pb2+ and Cd2+ results in the one-step formation of the corresponding metal carbonates. The metal carbonates are formed by reaction of the heavy-metal ions with CO2 produced by the fungus during metabolism and thus provide a…
Mixed cultures submitted to acetate "feast" and "famine" cycles are able to store intracellularly high quantities of polyhydroxybutyrate (PHB). It was demonstrated in a previous study that the intracellular PHB content can be increased up to 78.5% (g HB/gVSS) of cell dry weight in a sequencing batch reactor (SBR) with…
Novel silver clusters have been prepared by simply carrying out the silver mirror reaction on certain reactive substrates. Leaflike fractal silver microstructures and perpendicularly aligned silver nanosheets were produced on a commercially available copper foil and sandpaper-rubbed copper foil, respectively. The surf…
Manipulating optical properties of single-walled nanotubes (SWNTs) is necessary for the development of nanoscale optical devices and probes for biomedical research. In life sciences it will make possible the direct observation of SWNTs inside living cells using optical microscopes. In the nanotechnology field it will…
A brush with success: Responsive brushes composed of poly(N-isopropylacrylamide) grafted onto a poly(thiophene) backbone display the highest water solubility ever reported for a neutral poly(thiophene) as well as temperature-dependent optical properties and water solubilities (see picture). The graft polymer exhibits…
Tunable fluorescence emission from blue to red (see Figure) is exhibited by nanoparticles of 1,3,5-triphenyl-2-pyrazoline (TPP) doped with 4-(dicyanomethylene)-2-methyl-6-(p-dimethyl-aminostyryl)-4H-pyran (DCM); the emission is found to be dependent on the amount of DCM dopant used. Efficient energy transfer is also s…
Anodic aluminum oxide (AAO) membranes were characterized by UV Raman and FT-IR spectroscopies before and after coating the entire surface (including the interior pore walls) of the AAO membranes by atomic layer deposition (ALD). UV Raman reveals the presence of aluminum oxalate in bulk AAO, both before and after ALD c…
Persistent and reversible optical phase control has been achieved in a manganite thin film through a careful choice of the composition of Pr1-x(Ca1-ySr(y))xMnO3 near a multicritical point. Pulsed laser light brings the lower temperature metallic phase out of the higher temperature charge-ordered insulator, while a cw…
Fracture in nanocrystalline metals is shown to depend on grain size. If the grain size is large enough, nanocrystalline metals fracture with a similar mechanism to coarse-grained materials—with extensive reduction in area and a ductile mode. Grain sizes below a critical value result in brittle fracture, via the breaki…
The review summarises data on transition metal complexes with the so-called non-innocent ligands. The specific feature of these complexes is that the oxidation state of the central metal atom and the electronic structure of the ligands are impossible to determine a priori and unambiguously. The results of experimental…
A new class of high molecular weight polysulfated PEO dendrimer-like glycopolymer has been synthesized by a combination of arm-first and core-first methodologies followed by trichloroacetimidate glycosidation as a facile bioconjugation strategy. An L-selectin antagonist was identified that exhibits 103-fold greater ac…
Abstract Summary: Core‐sheath nanofibers with conductive polyaniline as the core and an insulating polymer as the sheath were prepared by electrospinning of blends of polyaniline with either polystyrene or polycarbonate. These unique core‐sheath structures offer potential in a number of applications including nanoelec…
Hollow nickel spheres of 50–60 nm diameter have different properties from bulk nickel. For example, the authors demonstrate that the spheres exhibit a long-range magnetic-ordering transition at 575 K and enhanced coercivity. The facile synthesis of such spheres by mild hydrothermal redox reaction of nickel dodecylsulf…
CuBiP(2)Se(6), AgBiP(2)Se(6), and AgBiP(2)S(6) were prepared from the corresponding elements. CuBiP(2)Se(6) and AgBiP(2)Se(6) crystallize in the space group R with a = 6.5532(16) A and c = 39.762(13) A for CuBiP(2)Se(6) and a = 6.6524(13) A and c = 39.615(15) A for AgBiP(2)Se(6). AgBiP(2)S(6) crystallizes in the tricl…
Measurements of coherent electron spin dynamics in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}/{\mathrm{Al}}_{0.4}{\mathrm{Ga}}_{0.6}\mathrm{As}$ quantum wells with $0.0006%<x<0.03%$ show an antiferromagnetic (negative) exchange between $s$-like conduction band electrons and electrons localized…
Prussian blue nanotubes were fabricated by using a sequential deposition technique inside the 60-nm well-ordered pores of anodic alumina. By varying the deposition parameters and the dimensions of the template, we could tailor the length and the outer as well as the inner diameter of the tubes. The nanotubes were char…