Materials Literature
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The phase behavior of the system of parallel rigid triblock copolymers is examined using the second-virial density functional theory. The triblock particle consists of two identical infinitely thin hard rods of finite lengths on the opposite ends of one central hard cylinder with nonzero length and diameter. Stability…
December 1991 legislation in France has spurred research on enhanced separation and conditioning or transmutation of long-lived radionuclides from high level radioactive wastes (HLW). In this field, we have studied zirconolite-based glass-ceramics in which the crystalline phase (zirconolite: CaZrTi2O7) aimed to prefer…
Oxidation of single-walled carbon nanotubes (SWNTs) with nitric acid increases their dispersability in water, methanol, and N, N -dimethylformamide. Two oxidation protocols, sonication in 8 M HNO 3 at 40 °C and reflux in 2.6 M HNO 3, have been examined using SWNTs produced by the CoMoCat, HiPco, and pulsed laser vapor…
In this work, dynamically tunable, superlyophobic surfaces capable of undergoing a transition from profound superlyophobic behavior to almost complete wetting have been demonstrated for the first time. In the initial state, with no voltage applied, these surfaces exhibit contact angles as high as 150 degrees for a wid…
Since their development in the 1980's organic electrochemical transistors (OECTs) have attracted a great deal of interest for biosensor applications. Coupled with the current proliferation of organic semiconductor technologies, these devices have the potential to revolutionize healthcare by making point-of-care and ho…
Orbital reconstructions and covalent bonding must be considered as important factors in the rational design of oxide heterostructures with engineered physical properties. We have investigated the interface between high-temperature superconducting (Y,Ca)Ba(2)Cu3O7 and metallic La(0.67)Ca(0.33)MnO3 by resonant x-ray spe…
The fibrillization of peptides is relevant to many diseases based on the deposition of amyloids. The formation of fibrils is being intensively studied, especially in terms of nanotechnology applications, where fibrillar peptide hydrogels are used for cell scaffolds, as supports for functional and responsive biomateria…
We present an alternate version of the undergraduate laboratory experiment developed by Dixon [Am. J. Phys. 75, 1038–1045 (2007)] that is suitable for second-year students. We study the temperature variation of the capacitance of a ferroelectric ceramic derived from barium titanate, the Ba(Ti0.9Sn0.1)O3 solid solution…
This work presents an extremely simple and inexpensive way to prepare Co/SiO 2 catalysts. We found that the calcined catalysts evidenced as Co 2 SiO 4 show strong interaction with silica support. The catalysts are well dispersed in the matrix of silica support and highly stable during growth of carbon nanotubes (CNTs)…
Abstract The reaction of [Au(tht)Cl] (tht = tetrahydrothiophene) with 2,5‐bis(diphenylphophanyl)thiophene (dppthph) and Se(SiMe 3 ) 2 leads to the formation of [Au 18 Se 8 (dppthph) 6 ]Cl 2 . This compound crystallizes in two modifications, both containing a cluster dication with nearly identical gold–selenium cores.…
Cyclic voltammetry measurements and XANES spectra of hydrated NiO films with metallic Au nanoparticles embedded in them showed an electrochemical activity that modified their overall properties when incorporated in a galvanic cell. With respect to the electrochromic properties, Au nanoparticles played an important rol…
Radiolaria-like, hierarchically structured mesoporous silica hollow spheres with long, radially protruding and multicellular structured spines were fabricated through a dynamic self-organization process. This hierarchically structured silica is self-assembled by a unique emulsion-templating method, in which the acidif…
Poly(ethyleneimine) (PEI) was covalently grafted to hydrogel films of poly(2-hydroxyethyl methacrylate- co -acrylic acid) (PHEMA- co -PAA) to direct the growth of silica nanoparticles from a sol−gel reaction at room temperature and pH 5. The deposition was found to be site-specific, and the thickness and morphology of…
We investigated the spectroscopic properties of the aromatic residues in a set of octapeptides with various self-assembly properties. These octapeptides are based on lanreotide, a cyclic peptide analogue of somatostatin-14 that spontaneously self-assembles into very long and monodisperse hollow nanotubes. A previous s…
Electronic structure of stripe ordered ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Ni}{\mathrm{O}}_{4}$ is investigated. The system with $x=\frac{1}{3}$ is insulator, in $\mathrm{LSDA}+U$ calculations, and shows charge and spin stripe, consistent with the experimental results. A highly correlated system…
Characteristic tribological properties, such as nonlinearity of the friction force-normal load curve, high coefficient of friction, and good wear-resistant performance were observed on densely packed, vertically aligned carbon nanotubes (CNTs) with different diameters and lengths using atomic force microscopy. Shorter…
Micellar core-embedded Au or CdS nanoparticles (NPs), in which the number of NPs was controlled by a solid type or a solution type of metallic precursors and by their amounts, were constructed using a block copolymer as a template. The location of NPs located at the micellar core was dramatically changed to the corona…
Bleifrei: Kleine Bi3+-Kationen besetzen als Folge des Bindungsverhaltens dreier Kationen in oktaedrischen Koordinationsumgebungen die zwölffach-koordinierten A-Plätze einer Perovskitstruktur in wenig symmetrischer Weise (siehe Bild); so entsteht ein Pb-freies ferroelektrisches Material. Das Diagramm zeigt die Temperat…
The structural and electronic properties of small silicon clusters (${\mathrm{Si}}_{n}$ with $n=2--7$) adsorbed on graphite (0001) and diamond (100) substrates are studied by density functional theory within periodic boundary conditions. A three-layer graphene slab with 60 carbon atoms in each layer is used to represe…
Identification of the metastable zone width (MZW) is crucial for product quality control in industrial crystallization. Traditionally, the MZW in batch cooling crystallization has been defined as a kind of static property of a solution that primarily depends on cooling rate. In industrial batch crystallization operati…