Materials Literature
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The alternate deposition of exponentially and linearly growing polyelectrolyte multilayers leads to the formation of multicompartment films. In this study, a new system consisting in nanometer-sized multilayer barriers deposited on or between multilayer compartments was designed to respond to mechanical stimuli and to…
The surrounding shapes the box: The zinc porphyrin dimer 1 bearing pyridyl groups can chiroptically sense an asymmetric hydrocarbon, such as limonene, by forming the homochiral box-shaped tetrameric assembly BOX⊥. As the BOX⊥ formed is enantiomerically enriched, the optical purity as well as the absolute configuration…
In this work, we report the optical properties of Nd3+ ions in tellurite glasses (TeO2-TiO2-Nb2O5) for two different Nd3+ concentrations. Judd-Ofelt intensity parameters were derived from the absorption spectrum and used to calculate the radiative lifetime and stimulated emission cross section of the transition. The n…
We present a computer simulation study on the crystalline phases of hard ellipsoids of revolution. For aspect ratios >or=3 the previously suggested stretched-fcc phase [Frenkel and Mulder, Mol. Phys. 55, 1171 (1985)] is replaced by a different crystalline phase. Its unit cell contains two ellipsoids with unequal orien…
Abstract Understanding the relationship between the number‐average molecular weight ( M n ) and the shape memory behavior of polymers is crucial for a complete picture of their thermomechanical properties, and hence for the development of smart materials, and, in particular, in textile technology. We report here on th…
Biological systems are capable of remarkable control over crystal growth, producing morphologically complex single crystals with curved surfaces. We have previously demonstrated that crystals with identical morphological complexities can be produced synthetically using templating routes. This article provides a detail…
Gd-loaded nonspherical liposomes represent a new family of MRI agents that show contrast-enhancing ability upon applying different image acquisition modes. In fact they can act either as T 1 - or T 2 - or CEST- agents. For the first time a Gd complex is endowed with detectable shift reagent properties.
Abstract Azido–Ni II complexes of dinuclear, [Ni 2 (trpn) 2 (μ 1,3 ‐N 3 ) 2 ](ClO 4 ) 2 ( 1 ), and monodimensional structures cis ‐[Ni(abap)(μ 1,3 ‐N 3 )] n (ClO 4 ) n ( 2 ) and cis ‐[Ni(Me 6 trien)(μ 1,3 ‐N 3 )] n (ClO 4 ) n · n H 2 O ( 3a ) as well as the monomer [Ni(Me 6 trien)(N 3 )]ClO 4 ( 3b ) {trpn = tris(3‐ami…
Well-dispersed YBO(3):Eu nanocrystals have been fabricated by a solvothermal method. The size and morphology of the products are controlled successfully via adjusting the reaction conditions. The prepared YBO(3):Eu phosphors were characterized by powder X-ray diffraction, transmission electron microscopy, and other te…
Crystallization of the poorly durable Na 2 MoO 4 phase able to incorporate radioactive cesium must be avoided in SiO 2 –Al 2 O 3 –B 2 O 3 –Na 2 O–CaO glasses developed for the immobilization of Mo‐rich nuclear wastes. Increasing amounts of B 2 O 3 and MoO 3 were added to a SiO 2 –Na 2 O–CaO glass, and crystallization…
The structural energetics and diffusion mechanisms of the two most important point defects in rutile $\mathrm{Ti}{\mathrm{O}}_{2}$, the oxygen vacancy $({V}_{\mathrm{O}})$ and the titanium interstitial $({\mathrm{Ti}}_{I})$, are examined using the ab initio pseudopotential total-energy method. The two defects are foun…
The structure and the properties of the quasi-one-dimensional composites, i.e., carbon nanotubes filled with nanowires or clusters of $3d$ metals ($\mathrm{M}=\mathrm{Ti}$, Fe, and Zn), have been studied in the framework of the density functional-based tight binding method. We show that the accommodation of nanosized…
4-n-octyl-4-cyanobiphenyl has been recently shown to display an unusual sequence of phases when confined into porous silicon (PSi). The gradual increase of oriented short-range smectic (SRS) correlations in place of a phase transition has been interpreted as a consequence of the anisotropic quenched disorder induced b…
We study the electron transport in semiconducting nanocrystal arrays at temperatures $T\ll E_c$, where $E_c$ is the charging energy for a single grain. In this temperature range the electron transport is dominated by co-tunneling processes. We discuss both elastic and inelastic co-tunneling and show that for semicondu…
Because of their unique structure, it has been proposed that carbon nanotube ropes may well provide an ideal container for the storage of molecular hydrogen. Indeed, there has been some experimental evidence of enhanced hydrogen uptake in doped Li and other alkali metal systems [Chen et al, Science 285, 91 (1999)]. We…
The size-tunable synthesis of poly(vinylpyrrolidone)-stabilized cuboctahedral rhodium nanoparticles with mean diameters ranging between 3-7 nm and multipod structures was accomplished using seeded growth methods. Isotropic PVP-capped 2.9 nm seeds were prepared by ligand exchange on rhodium-triphenylphosphine metal-org…
We developed modified embedded-atom method (MEAM) interatomic potentials for the $\mathrm{Mg}\text{\ensuremath{-}}\mathrm{Al}$ alloy system using a first-principles method based on density functional theory (DFT). The materials parameters, such as the cohesive energy, equilibrium atomic volume, and bulk modulus, were…
Many-body effects in confined quantum systems pose a challenging problem due to the simultaneous presence of particle-particle interactions and spatial inhomogeneity. Here we investigate universal properties of strongly confined particles that turn out to be dramatically different from what is observed for electrons i…
The recently developed practice of spraying polyelectrolyte solutions onto a substrate in order to construct thin films via the layer-by-layer technique has been further investigated and extended. Here we describe a fully automated system capable of depositing thin polymer films from atomized mists of solutions contai…
The effect of O 2 plasma treatment on surface energy, topography and surface chemistry of the negative photoresist epoxy novolak SU-8 was investigated by contact angle goniometry, atomic force microscopy (AFM) and x-ray photoelectron spectroscopy (XPS). Directly after plasma treatment, the surfaces were completely wet…