Materials Literature
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Hyperbranched polyurethane (HBPU) nanocomposites with multi-walled carbon nanotubes (MWNTs) were prepared by in situ polymerization on the basis of poly(ε-caprolactone)diol as the soft segment, 4,4'-methylene bis(phenylisocyanate) as the hard segment, and castor oil as the multifunctional group for the hyperbranched s…
In this paper, a general method for the preparation of metal oxides with all polar surfaces exposed is presented. The syntheses of the products were carried out with simply performing reactions in a molten salt system, in which cations and anions tend to have strong electrostatic interactions with positive or negative…
Auf Abruf aromatisch: Die Konformationen von [32]Heptaphyrinen(1.1.1.1.1.1.1) hängen von den meso-Arylsubstituenten, dem Lösungsmittel, der Temperatur und dem Protonierungszustand ab. So führt die Protonierung von meso-Pentafluorphenyl-substituiertem [32]Heptaphyrin bei Raumtemperatur zu Konformationsänderungen, durch…
On and off the spot: The spatio-temporal light-activation of gene silencing was achieved through the complete inactivation of phosphorothioate antisense agents by installing light-removable (caged) groups at specific sites, as illustrated here. Full antisense activity was restored through a brief irradiation with UV l…
A novel plasmon-coupled quantum dot (QD) nanocomposite via covalently interfacing the QD surfaces with silver nanoparticles was developed with greatly reduced blinking and enhanced emission fluorescence.
Conducting polymers are unique reactive materials whose composition (polymer–counterion–solvent) shifts (non-stoichiometry) under electrochemical control in liquid electrolytes. The involved events (electric pulses, conformational movements, ions and solvent composition change, or shift of the intra- and intermolecula…
Magnetic properties of graphenic carbon nanostructures, which are relevant for future spintronic applications, depend crucially on doping and on the presence of defects. In this paper we study the magnetism of the recently detected substitutional Ni $({\text{Ni}}_{\text{sub}})$ impurities. ${\text{Ni}}_{\text{sub}}$ d…
La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−α (LSCF) perovskite powders having a submicrometer size were synthesized by a sol−gel autocombustion method. From these powders, the gastight LSCF hollow-fiber membranes with a highly asymmetric structure comprising a dense layer of thickness ca. 88 μm integrated with a porous substrate…
This report reviews the state of the art as concerns the synthesis of metal nanostructures synthesized with polyoxometalates acting as both reducing and capping agents. Two main strategies appear in the literature: the reduced polyoxometalates, necessary for carrying out the process, can be obtained by photochemical r…
We study the nonlocal spin transport in a lateral spin valve with multiple ferromagnetic (FM) electrodes. When two current-injecting and two spin current-detecting electrodes are all ferromagnetic, the number of possible nonlocal spin signal states is four at maximum. In reality, this number is reduced, depending on t…
We use charge sensing of Pauli blockade (including spin and isospin) in a two-electron 13C nanotube double quantum dot to measure relaxation and dephasing times. The relaxation time, T1, first decreases with parallel magnetic field then goes through a minimum in a field of 1.4 T. We attribute both results to the spin-…
The growth of N,N'-dimethylperylene-3,4,9,10-bis(dicarboximide) (DiMe-PTCDI) on KBr(001) and NaCl(001) surfaces has been studied. Experimental results have been achieved using frequency modulation atomic force microscopy at room temperature under ultra-high vacuum conditions. On both substrates, DiMe-PTCDI forms molec…
We report on a Raman-scattering investigation of the charge density wave (CDW), quasi-two-dimensional rare-earth tritellurides $R{\text{Te}}_{3}$ ($R=\text{La}$, Ce, Pr, Nd, Sm, Gd, and Dy) at ambient pressure, and of ${\text{LaTe}}_{3}$ and ${\text{CeTe}}_{3}$ under externally applied pressure. The observed phonon pe…
Self-sorting processes in the assembly of gel-phase materials from mixtures of different molecular-scale building blocks can lead to the spontaneous orthogonal assembly of two different nanoscale gel-phase networks at the same time.
Elementary excitations in a paramagnetic semiconductor quantum well confined to a cylindrical surface are theoretically studied on the basis of coupled spin-charge drift-diffusion equations. The electric-field-mediated eigenmodes are optically excited by an oscillating interference pattern, which induces a current in…
We propose a method for the evaluation of magnetic exchange couplings based on noncollinear spin density functional calculations. The method employs the second derivative of the total Kohn-Sham energy of a single reference state, in contrast to approximations based on Kohn-Sham total energy differences. The advantage…
We present a structural analysis of the graphene-4HSiC(0001) interface using surface x-ray reflectivity. We find that the interface is composed of an extended reconstruction of two SiC bilayers. The interface directly below the first graphene sheet is an extended layer that is more than twice the thickness of a bulk S…
Brillouin zones of graphene systems possess Dirac points, where band degeneracies occur. We study the variety of (and large magnitude) phases that the electronic states can acquire when a uniform time-dependent electric field carries the electrons around one or more Dirac points in a non-concentric fashion. An experim…
Switching Aromaticity: Conformations of [32]heptaphyrins(1.1.1.1.1.1.1) are dependent upon meso-aryl substituents, solvents, temperature, and protonation. Particularly, protonation of meso-pentafluorophenyl-substituted [32]heptaphyrin triggers conformational changes to form twisted aromatic Möbius structures (see pict…
Highly dispersed metal (Pd, Pt) nanoparticles and uniformly distributed metal (Au, Ag) nanowires have been synthesized in ordered mesoporous silica SBA-15 via conventional incipient wetness impregnation followed by novel glow discharge plasma reduction. N 2 adsorption−desorption isotherms and the low-angle X-ray diffr…