Materials Literature
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The usage of hollow poly(styrenesulfonate)/poly(allylamine hydrochloride) polyelectrolyte capsules for the selective precipitation of YF 3 from water solution was described. Weakly crystallized YF 3 particles of 6−9 nm diameter were synthesized exclusively inside the restricted volume of the polyelectrolyte capsule an…
Ein scharfes Maximum in der Struktur-Aktivitäts-Beziehung, ein überraschend starker Einfluss der hydrophoben Teilstruktur auf DNA-Bindung und -Transport und ein ungewöhnlicher Serum-Effekt auf die relativen Transfektionsaktivitäten wurden in ersten biologischen Studien an einer Serie von vier amphiphilen Dendrimeren g…
Langsame Relaxation des Paramagnetismus der Titelverbindung bei niedrigen Temperaturen in Wechselstrom-Suszeptibilitätsmessungen, belegt durch ein frequenzabhängiges phasenverschobenes Signal (χ, siehe Bild), demonstriert überzeugend, dass dieser Cluster ein seltenes Beispiel für einen Cyanid-verbrückten Einzelmolekül…
The nickel coordination chemistry of a series of polytopic diazine (N-N) based ligands has been examined. Self-assembly reactions lead to examples of dinuclear, trinuclear, tetranuclear, pentanuclear, and octanuclear complexes, all of which exhibit magnetic exchange coupling, with antiferromagnetic and ferromagnetic e…
We investigate an all solid-state thin-film microsupercapacitor (TFSC) fabricated with tungsten cosputtered ruthenium oxide electrodes (W-RuO2) and LiPON electrolyte. It is shown that the room-temperature charge–discharge behavior of the TFSC is similar to that of a bulk-type supercapacitor. It is also shown that the…
The stable magnetization configurations of a ferromagnet on a quasiperiodic tiling have been derived theoretically. The magnetization configuration is investigated as a function of the ratio of the exchange to the dipolar energy. The exchange coupling is assumed to decrease exponentially with the distance between magn…
In this study the influence of temperature and water on the dissolution of cellulose in the solvent system LiCl/DMAc is examined. The phase diagrams performed in the system without water show that higher amounts of cellulose can be dissolved at 5 °C, whereas at 25 °C smaller concentrations of LiCl in DMAc are sufficie…
Langsame magnetische Relaxation und Hysterese-Effekte kennzeichnen die 1D-Ising-Systeme [{FeL(CN)4}2Co(H2O)2]⋅4 H2O mit L=2,2′-Bipyridin (bpy; siehe Bild, Ow=Wasser-O-Atom) oder 1,10-Phenanthrolin, in denen Low-Spin-FeIII- und High-Spin-CoII-Zentren durch Cyanidliganden zu ferromagnetisch gekoppelten Dimetallketten ve…
Novel heterogeneous catalysts for hydroformylation of olefins to aldehydes using encapsulation and anchoring methodologies for HRh(CO)(PPh 3 ) 3 in zeolite Na−Y and MCM-41 and MCM-48 mesoporous materials have been reported. The heterogeneous catalysts were characterized and used for hydroformylation of linear and bran…
New coatings protect nanocrystals from the watery environment of the cell and pave the way for widespread use of the versatile fluorescent clusters in biology. These so-called quantum dots could replace traditional organic dyes for some types of imaging studies.
Carbon nanotube field-effect transistors often exhibit a hysteresis effect in the gate-voltage dependence. We report devices fabricated with small hysteresis, and demonstrate a method to introduce this effect controllably by coating nanotube devices with charged polymers. In addition, the hysteresis is sensitive to hu…
An iron constitution: Dark superparamagnetic iron oxide nanoparticles are present within the walls of a hexagonal mesoporous aluminosilicate (as shown by the associated bright-field TEM image). The simple block-copolymer-based “one-pot” self-assembly approach enables potential applications in magnetic separation and c…
Star-shaped polylactide was synthesized by bulk polymerization of lactide with poly(amidoamine) (PAMAM) dendrimer as initiator, which was marked as PAMAM-g-PLA for simplicity. The nonlinear architecture of PAMAM-g-PLA was confirmed by gel permeation chromatograph, nuclear magnetic resonance, and differential scanning…
Combining high-resolution core-level spectroscopy (HRCLS), scanning tunneling microscopy (STM) and density-functional theory (DFT) calculations we reanalyze the Pd(100)-(SQRT(5) x SQRT(5) R27^o)-O surface oxide phase. We find that the prevalent structural model, a rumpled PdO(001) film suggested by previous low energy…
The stereochemistry of the 1,2-cyclohexanediol intermediate plays an important role with regard to both the rate and selectivity of the production of adipic acid from cyclohexene in the absence of an organic solvent. A titanium-containing aluminophosphate molecular sieve (TAPO-5) is shown to serve as a good heterogene…
We consider the effect of the Rashba spin-orbital interaction and space charge in a ferromagnet-insulator/semiconductor/insulator-ferromagnet junction where the spin current is severely affected by the doping, band structure and charge screening in the semiconductor. In diffusion region, if the the resistance of the t…
We study the effect of doping in the suppression of tunneling observed in multi-walled nanotubes, incorporating as well the influence of the finite dimensions of the system. A scaling approach allows us to encompass the different values of the critical exponent $α$ measured for the tunneling density of states in carbo…
We demonstrate the growth of GaN/AlN quantum well structures by plasma-assisted molecular-beam epitaxy by taking advantage of the surfactant effect of Ga. The GaN/AlN quantum wells show photoluminescence emission with photon energies in the range between 4.2 and 2.3 eV for well widths between 0.7 and 2.6 nm, respectiv…
A well-known connection between the magnetic susceptibility and the effective exchange parameter is analyzed. It is shown that all current computational schemes use a long-wave approximation which is suitable only for localized moments systems. A corresponding smallness parameter is derived in real and recipical space…
We perform ab initio calculations of charged graphene and single-wall carbon nanotubes (CNTs). A wealth of electromechanical behaviors is obtained. (1) Both nanotubes and graphene expand upon electron injection. (2) Upon hole injection, metallic nanotubes and graphene display a nonmonotonic behavior. Upon increasing h…