Materials Literature
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The crystal structure of the ordered double perovskite Sr2MnTeO6 has been refined at ambient temperature from high resolution neutron and x-ray powder diffraction data in the monoclinic space group P 121/n 1 with a = 5.7009(1) A, b = 5.6770(1) A, c = 8.0334(1) A and β = 90.085(1)°. This represents a combination of in-…
An MFI zeolite framework containing iron and aluminum has been prepared and characterized by X-ray absorption spectroscopy. Extended X-ray absorption fine structure analysis indicates that in the as-prepared zeolite Fe is present in the framework but migrates to extraframework sites upon thermal activation at elevated…
We report a direct photopatterning method to produce patterns of thin films containing nanometer-sized pores. A photoacid generator (PAG) was used as a photosensitive agent to initiate the cross-linking reaction of poly(methylsilsesquioxane) (PMSSQ) while an amphiphilic polymeric nanoparticle templates porous structur…
Time-resolved small-angle X-ray scattering (SAXS) measurements performed during the formation of tetraethyl orthosilicate (TEOS) based silica gels in alcohol with 3-(2-aminoethylamino)propyltrimethoxysilane (EDAS) as an additive are reported. The measurements reveal no discontinuity of the nanostructure at the gel poi…
The thermodynamics and kinetics of oxygen radical formation in cages of a nanoporous crystal, 12CaO·7Al 2 O 3, were examined during isothermal annealing in a dry oxygen atmosphere. The formation of oxygen radicals, O 2 - and O -, involves the outward diffusion of extraframework oxide ions, their oxidation by absorbed…
We have studied the colour centre production by swift electron and heavy ion irradiations of yttria-stabilized zirconia (YSZ), i.e. ZrO2:Y with 9.5 mol% Y2O3. For this purpose, we performed irradiations of \langle 100\rangle - or \langle 110\rangle -oriented YSZ single crystals with 2.5 MeV electrons, 145 MeV 13C, 180…
A new, stable iron(III) complex with a pentadentate amide-containing macrocyclic ligand was prepared and fully characterized. The complex adopted a pentagonal-bipyramidal geometry, where an equatorial plane is occupied by the pyridine nitrogen, two deprotonated amide nitrogens, and two secondary amines from the macroc…
Photolysis of perfluoroazooctane with diamond films led the chemical modification of the surface to introduce perfluorooctyl functional groups, confirmed by means of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and time-of-flight secondary ion mass spectrometry m…
The symmetry break of the particle interaction field at surfaces causes a variety of interfacial effects including the variation of the relative stability of different phases of a given compound. In many materials surface melting is observed, i.e. a surface near a portion of the system is in a less ordered state than…
The ordering kinetics of the cylinder phase were characterized using polarizing optical microscopy (POM). Measurements were made on a poly(styrene- b -isoprene) diblock copolymer with block lengths of 15 and 13 kg/mol, respectively, in solution with dibutyl phthalate at a polymer volume fraction of 0.50. Thermal quenc…
A series of [3 x 3] Mn(II)(9), antiferromagnetically coupled, alkoxide-bridged, square grid complexes, derived from a group of "tritopic" dihydrazide ligands, is described. The outer ring of eight Mn(II) centers in the grids is isolated magnetically from the central Mn(II) ion, leading to an S = 0 ground state for the…
We have synthesized La 0.67 Ca 0.33 MnO 3 (LCMO): x ZnO ( ) composites through a citrate gel route and have characterized them for magnetic and magnetotransport properties. In lower concentrations ( ), ZnO mostly goes into the perovskite lattice substituting Mn in LCMO and segregates less in the grain boundary region,…
Abstract A new reaction was developed to synthesize ZnO nanoparticles with nearly uniform, spherical morphologies and controlled size range from 25–100 nm via esterification between zinc acetate and ethanol under solvothermal condition. The ZnO nanoparticles were characterized by X-ray diffraction and transmission ele…
Tethering of monodisperse, chain-end-functionalized polymer from dilute solution to a solid surface shows three regimes of kinetics. This paper presents support for the hypothesis that the experimentally observed third regime is indeed the transition from mushroom to brush and that it occurs in a spatially nonuniform…
We show that a simple soft-core binary fluid mixture with purely repulsive interactions exhibits a λ-line, i.e., a line of continuous transitions to a state characterized by undamped periodic concentration fluctuations (microphase separation). For states in the disordered fluid phase the bulk pair correlation function…
α-Al 2 O 3 nanowires have been synthesized in bulk quantity by using simple physical evaporation of mixture of pure Al powders and nanometre-sized TiO 2 powders at 1150 °C. Scanning electron microscopy and transmission electron microscopy observations show that α-Al 2 O 3 nanowires have diameters ranging from 20 to 60…
Thin films of amorphous vanadium oxide have been prepared by electrochemical anodic oxidation. The phase composition of anodic films on vanadium has been shown to depend on the oxidation conditions (electrolyte composition, oxidation current, and time), and the stoichiometry can be controlled from V O2 to V2O5. Physic…
Alumina-supported Au particles (1.16 wt %) were prepared by a deposition-precipitation method involving a HAuCl4 precursor. X-ray absorption spectroscopy at the Au L(III) edge was used to monitor the evolution of the Au oxidation state and atomic structure during pretreatment in He up to 623 K. Although the as-prepare…
This work, by means of molecular dynamics simulations, shows that the features of C 60 encapsulation into boron nitride nanotubes (BNNTs) are similar to the features of that into carbon nanotubes (CNTs), whereas the encapsulating and the internal dynamics of the C 60 @BNNT are different from those of the C 60 @CNT. Si…
Fiber Recruiting (FiRe) peptides are described. These are derivatives of self-assembling fiber (SAF) forming peptides that are conjugated with small molecules (in our case, biotin or a FLAG-tag octapeptide). The FiRe peptides are co-assembled into fibers and used as bait to recruit folded and functional proteins to th…