Materials Literature
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The fabrication of stable polyelectrolyte/Au nanoparticle multilayer films was achieved by the UV irradiation of layer-by-layer self-assembled multilayers consisting of diazoresins and Au nanoparticles. The method promises to be a simple and efficient strategy to construct covalently attached organic/inorganic multila…
We investigate the blue photoluminescence of Si+-implanted SiO2 films under picosecond UV excitation. The emission intensity exhibits a nonlinear increase with increasing excitation intensities, accompanied by pulse shortening. The photoluminescence decays nonmonoexponentially in time. However, the nonlinearities are…
An advanced process has been developed on a laboratory scale at the Institute for Transuranium Elements (ITU) for the fabrication of transmutation fuels and targets. The process consists of the fabrication of highly porous beads using a sol–gel method, their infiltration by a nitrate solution of the relevant actinide,…
Interaction forces between flame-polished glass surfaces were measured in a range of aqueous solutions of a branched cationic polyelectrolyte, polyethylenimine (PEI) MW ≈ 70 000 g/mol. Short incubation in 1 ppm PEI solution leads to neutralization of the glass negative surface charge. At this point the interaction for…
The perovskites LaMnO(3) and CaFeO(3) consisting of high-spin d(4) transition metal ions undergo different types of distortions, i.e., a Jahn-Teller distortion in LaMnO(3) and a charge disproportionation in CaFeO(3). We investigated the electronic factor causing this difference on the basis of first principles spin-po…
AIMS: The objective of this study was to determine whether low concentrations of chitosan and benzoate in combination could be used to enhance the antimicrobial action of either compound alone against three spoilage yeasts in saline solutions. METHODS AND RESULTS: Saccharomyces exiguus, Saccharomycodes ludwigii and To…
An enzyme-inspired phthalocyanine (Pc) complex [F64PcCo(acetone)2] is the first representative of a novel class of robust homogeneous catalysts. This complex couples aryl and alkyl phosphanes with acetone to catalytically produce ylides (the structure shows the ylide coordinated to the F64PcCo unit: F green, N blue, O…
The open framework of [Eu2(btc)(H2btc)(H2O)]·4H2O (1), prepared by hydrothermal reaction of EuCl3 with 1,2,4,5-benzenetetracarboxylic anhydride in acidified aqueous solution, is built up from two types of polymeric layers with [EuO6(H2O)]n units as tethers, resulting in nanoporous channels that host water molecules th…
This paper describes the first examples of heteropolynuclear metallomesogens that contain both a transition metal ion and a trivalent lanthanide ion. Adducts were formed between a mesomorphic [Cu(salen)] complex (salen=2,2'-N,N'-bis(salicylidene)ethylenediamine) with six terminal tetradecyloxy chains and a lanthanide…
The morphology of low-density (0.86 g/cm 3 ), low-crystallinity (10%) elastomeric polypropylene (ePP) derived from a bis(2-arylindenyl)hafnium catalyst was investigated using a combination of polarized optical microscopy (POM), differential scanning calorimetry (DSC), wide-angle X-ray scattering (WAXS), Fourier transf…
Mesoporous [Al]MCM-41 material ( n Si / n Al = 15) has been modified by an aqueous solution of ammonium fluoride and characterized by XRD, N 2 adsorption, 1 H, 19 F, 27 Al, and 29 Si NMR spectroscopies and tested in the conversion of 2-propanol. By 1 H{ 27 Al} TRAPDOR MAS NMR it is shown that a significant number of S…
The electronic structure of SrCu2O2, a wide gap (∼3.3 eV) p-type oxide semiconductor, was examined by photoelectron and optical spectroscopy. The spectroscopy results were compared with the energy band structure calculated by the local density approximation method to clarify the origins of p-type conductivity in this…
The pump power dependence of the relaxation dynamics of CdSe nanoparticles (NPs) was studied with femtosecond pump probe spectroscopy at observation wavelengths of the first exciton transition at 560 nm, the near infrared (NIR) absorption at 2 μm, and the transient mid-infrared (IR) absorption at 4.5 μm. Excitation wi…
The dynamic fragilities of six polymeric materials have been compared for isobaric (constant pressure) and isochoric (constant volume) conditions. Data were taken from the published literature for dynamic experiments performed at elevated pressures. Published pressure–volume–temperature (PVT) data were then used to de…
The synthesis and purification of a water-soluble host compound that contains three pyridinium units and one spacer-connected benzocrown ether unit in the meso-positions of porphyrin and of its Zn(II) or Cu(II) complexes is described. Metalation leads to small (compared to the apo-derivative) changes of selectivities…
Small-angle scattering is widely used for measuring materials microstructure in the 1–100 nm size range. Ultrasmall-angle x-ray scattering (USAXS), typically achieved through crystal collimation, extends this size range to include features over 1 μm in size. This article reports on USAXS on the UNICAT beam line 33-ID…
New 1D complexes are obtained from the reaction of 1,1′-biphenyl-2,2′-dicarboxylic acid (diphenic acid) with KOH and [Co(NO3)2·6H2O] or [Ni(NO3)2·6H2O] under hydrothermal conditions. Compounds 1 and 2 are isostructural and their structure consists of stacked helical chains of octahedral metal(II) ions. Magnetic measur…
Elaborate transcription of unimolecular stacks or helically bundled fibers of sugar-appended porphyrin gelators into silica by sol–gel polycondensation of tetraethoxysilane gives unique hollow silica fibers with a monodispersed 4-nm inner diameter (left picture) and huge helical silica bundles (right picture), respect…
Polypyrrole films were investigated by using ac-electrogravimetry, that is, simultaneous impedance and electrogravimetry spectroscopies at various potentials between the reduced and oxidized forms in NaCl solutions. Information about the movement of anions, cations, and solvent during the switching of polypyrrole betw…
A heterogeneous version of the Sharpless epoxidation: a chiral tartaric acid derivative is grafted onto the surface of silica and in the mesopores of MCM-41 (see picture). The hybrid chiral catalyst is as effective as the homogeneous complex in terms of turnover number and enantioselectivity, and the product is easily…