Materials Literature
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We show that SIS Josephson junctions have a threshold resistance, above which the Josephson coupling and the supercurrents become extremely small, due to the shrinking of the Cooper pair size during the Josephson tunneling. Accordingly, the threshold resistance is smaller for higher Tc superconductors with small Coope…
Using the functional-integral method we investigate the effective dynamics of a charged particle coupled to a set of two-level systems as a function of temperature and external electric field. The optical conductivity and the direct current (dc) resistivity induced by the reservoir are computed. Three different regime…
It's under control: In the presence of an artificial double-hydrophilic block copolymer, poly(ethylene glycol)-b-poly(L-glutamic acid), highly monodisperse vaterite microspheres crystallize from a mixture of N,N-dimethylformamide and water (see picture). Varying the ratio of the solvents can control the morphology of…
Polyhydroxyalkanoates (PHA) containing block copolymers were synthesized in Cupriavidus necator using periodic substrate addition. Poly(3-hydroxybutyrate) (PHB) segments were formed during fructose utilization. Pulse feeds of pentanoic acid resulted in the synthesis of 3-hydroxyvalerate monomers, forming poly(3-hydrox…
The crystallization kinetics of colloidal hard spheres was studied using a special Bragg spectrometer with high sensitivity. In contrast with the classical scenario we observe a two-step nucleation process: the number of crystallites increases slowly at early times, followed by a dramatic reduction at intermediate tim…
An approach based on a lattice version of the Boltzmann kinetic equation for describing multi-phase flows in nano- and micro-corrugated devices is proposed. We specialize it to describe the wetting/dewetting transition of fluids in presence of nanoscopic grooves etched on the boundaries. This approach permits to retai…
The atomic-level control achievable in artificially structured oxide superlattices provides a unique opportunity to explore interface phases of matter including high-density two-dimensional (2D) electron gases. Electronic-structure calculations show that the charge distribution introduced by ${\mathrm{LaTiO}}_{3}$ mon…
An electrospun cardiovascular graft composed of polydioxanone (PDO) and elastin has been designed and fabricated with mechanical properties to more closely match those of native arterial tissue, while remaining conducive to tissue regeneration. PDO was chosen to provide mechanical integrity to the prosthetic, while el…
The energy of a large number of oxidation reactions of $3d$ transition metal oxides is computed using the generalized gradient approach (GGA) and $\mathrm{GGA}+\mathrm{U}$ methods. Two substantial contributions to the error in GGA oxidation energies are identified. The first contribution originates from the overbindin…
An analysis of the effect of microcracks in porous metals on amplitude-dependent internal friction (ADIF) is carried out. A mathematical model is developed, which takes into account an initial distribution of microcracks lengths defining subsequent crack growth during cycling. Using the Dugdale model, the linear densi…
We study one-dimensional systems constructed from a segment by employing the Cantor-set rule up to an arbitrary stage of self-similar patterns. The rigorous expression of the transfer matrix to describe the electromagnetic waves propagating through them is presented. As displayed by numerical demonstration, the transm…
A highly ordered dot array pattern of surface micelles on water is formed by a spread monolayer of an amphiphilic block copolymer, polystyrene-block-poly(4-vinylpyridine) (PS-4VP), via hybridization with a liquid crystal molecule, 4'-pentyl-4-cyanobiphenyl (5CB), on water. Simple co-spreading of PS-4VP with 5CB provid…
Alles dreht sich: Durch Insertion eines difunktionellen Liganden, der als Achse fungiert und mit einem Ende an eine Silberoberfläche, mit dem anderen an das Metallzentrum eines Metalloporphyrins gebunden ist, wird eine ganze Population von Porphyrinmolekülen in Rotation versetzt. Das Entfernen der Achse beendet die Be…
The electronic excited states of a meso-meso beta-beta doubly linked bis-porphyrin are comprehensively investigated by measuring its circular dichroism (CD) and magnetic circular dichroism (MCD) spectra. The observed spectroscopic properties are rationalized by DFT calculations. The frontier molecular orbitals (MOs) a…
First principles calculations have been made to theoretically interpret the structural stability of SrTiO3 as a function of pressure or strain. We show that the orthorhombic Pbnm structure is more stable than the ideal perovskite one due to rotations of TiO6 octahedrons at high pressures or deformations of TiO6 octahe…
The preparation and characterization of second-generation electron-poor Pt(II) complexes of general formula [(P−P)Pt(C 6 F 5 )(H 2 O)][X], 1a − h (P−P = diphosphine, X = BF 4, OTf), bearing a pentafluorophenyl ligand is reported. The complexes are investigated as catalysts in the epoxidation of alkenes with hydrogen p…
The dielectric measurements have been carried out on the two zeroth generation dendrimers with four branched arms (called tetrapodes) based on the siloxane cores. The results are analyzed in the framework of the molecular theory of dielectric permittivity by Maier and Meier for nematogens. At least four molecular proc…
The exact perovskite structure has simple cubic symmetry and composition ABO3, where A is a relatively large cation and B a smaller one. The choices of A and B cations, and the substitutions possible on either site, generate a large variety of materials sharing the same base, with relatively small distortions of the s…
Abstract The novel cationic complex [Ag 14 (C 2 t Bu) 12 ] 2+ has been synthesized by four reactions: reaction of [Ag(C 2 t Bu)] n and AgBF 4 in acetone in a 6:1 mole ratio, that of HC≡C t Bu and AgBF 4 in water in the absence of a base, treatment of [AgC 2 t Bu] n with HBF 4 in acetone or that of {[Ag 3 (C 2 t Bu) 2…
An anodic aluminum oxide (AAO) template is prepared by anodizing aluminum in oxalic acid solution. C60 crystals were grown, using the pressure difference method, in the pores of the template, representing a brushlike thin film layer with a honeycomb boundary structure in one side and nail arrays in the other side. Dif…