Materials Literature
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Optical photobleaching experiments were used to directly measure the molecular mobility of PMMA during creep and recovery to study the interaction between mechanical deformation and physical aging. Experiments were performed both on PMMA glasses with different aging histories at T g − 14 K and on PMMA melts aged to eq…
Photochromic silver-containing mesoporous titania thin films are used as writable or rewritable data carriers. Continuous wave UV and visible laser radiations, respectively, can either repeatedly print and completely erase micropatterns on their surface or engrave permanent micropatterns, depending on the laser intens…
Abstract Time of flight secondary ion mass spectrometry (ToF‐SIMS) and X‐ray photoelectron spectroscopy (XPS) have been employed to study the interfacial interaction between polymeric methylene diphenyl diisocyanate (PMDI) and aluminum produced by the deposition of a thin PMDI layer on the aluminum, in order to improv…
Beam me up: A novel two-step process allows iron nanostructures to be generated locally on SiOx/Si at 300 K. The surface is first locally activated by an electron beam. Then the activated structures are exposed to [Fe(CO)5], which decomposes and grows autocatalytically to give pure Fe nanocrystals.
A series of ZnSe nanocrystals was synthesized in the range of pH 6.5−11.5 in aqueous solution by using glutathione (γ-glutamyl-cysteinyl-glycine, GSH) as ligand. The photoluminescence quantum yields (PLQYs) of the ZnSe nanocrystals were dependent on the pH of the reaction solutions, which increased from 0.5 to 23% as…
Two sets of identical tungsten (W) targets are irradiated at 300 K with 12.3 MeV W 4+ ions to peak damage levels ranging from 0.5 to 10 displacements per atom (dpa). This results in a damage profile that is peaked at ∼0.8 µm and extends to a depth of ∼1.5 µm. Both sets of targets are exposed to high-density ( n e,cent…
Abstract The sensitivity of infrared (IR) vibration spectroscopy can be enhanced by several orders of magnitude if plasmonic electromagnetic nearfield enhancement is exploited. For maximum enhancement the plasmonic resonance needs to be strong, which cannot be achieved by randomly grown metal island films that on aver…
From a combination of careful and detailed theoretical and experimental studies, we demonstrate that the Boltzmann theory including all scattering mechanisms gives an excellent account, with no adjustable parameters, of high electric field transport in single as well as double-oxide graphene transistors. We further sh…
Discrete mesoporous silica nanospheres (MSNSs) with a narrow size distribution were prepared by a newly developed method, which is based on the emulsion system containing Si(OEt) 4 (TEOS), water, cationic surfactant, and basic amino acid under weakly basic conditions (pH 9−10). The average 20 nm sized discrete MSNSs h…
A water-soluble, biodegradable and fluorescent hyperbranched poly(amidoamine) with mannose groups on their surface (M-HPAMAM) has been successfully prepared, and the synthetic strategy includes Michael addition polymerization of diacrylamide with 1-(2-aminoethyl)piperazine and, subsequently, surface modification with…
Graphene-based nanostructures are considered as promising alternatives to silicon-based mesostructures in future electronic nanodevices. The lithographical patterning of graphene, which are essential steps in any form of microelectronic processing, present interesting challenges because of the atomic layer thickness o…
We describe here the facile and robust preparation methods for the multiple-SPIO-containing silica-coated core/shell type nanoparticles which can serve as a highly sensitive MRI contrast agent. The imidazolium-tethered core/shell type particles were synthesized, and the centrifugal selection for the multiple-SPIO-cont…
Vanadosilicate zeolite AM-6, which contains a 3D array of vanadate (VIVO32−) quantum wires (see picture), was prepared as high-quality crystals (free from VV, titanosilicate seeds, and pore-blocking organic template cations) from inexpensive V2O5. The linear dependence of λmax and band-gap energy Eg on the partial cha…
Semiconductor quantum dots (QDs) synthesized by metal ions and colloid stabilizers have been explored as promising probes in advanced imaging techniques, tumor diagnostic agents, and drug delivery systems. The ability to modulate QDs surface chemistry through particle--shape control, surface coating, and surface funct…
Der Earl of Sandwich: Die erste Sandwich-Interclusterverbindung wurde ausgehend von Silberalkinylclustern und [CoW12O40]6− in einem Schritt erhalten. Der ringförmige Silberteil bildet direkte Kontakte zu den beiden Polyoxometallat-Anionen, die seinen Innenraum abschließen.
Mg-Ti alloys have uncommon optical and hydrogen absorbing properties, originating from a ``spinodal-like'' microstructure with a small degree of chemical short-range order in the atomic distribution. In the present study we artificially engineer short-range order by depositing Pd-capped Mg/Ti multilayers with differen…
Abstract Silicon nanocrystals (Si NCs) are shown to be an electron acceptor in hybrid solar cells combining Si NCs with poly(3‐hexylthiophene) (P3HT). The effects of annealing and different metal electrodes on Si NC/P3HT hybrid solar cells are studied in this paper. After annealing at 150 °C, Si NC/P3HT solar cells ex…
In this work we demonstrate that maximally localized Wannier functions (MLWFs) based on Kohn-Sham band structures provide a very robust and systematic way to construct realistic, materials-specific tight-binding models for further theoretical analysis. In particular, we construct MLWFs for the $\text{Mn}\text{ }{e}_{g…
A series of seven dipyrrin-based bis-cyclometalated Ir(III) complexes have been synthesized and characterized. All complexes display a single, irreversible oxidation wave and at least one reversible reduction wave. The electrochemical properties were found to be dominated by dipyrrin centered processes. The complexes…
The Earl of Sandwich: The first intercluster sandwich compound was obtained from silver alkynyl clusters and [CoW12O40]6− in a one-pot reaction. The silver block has a toroidal shape with direct contacts to two polyoxometalate anions, which close its open ends.