Materials Literature
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We investigate solid-solid and solid-liquid transitions of elastic flexible off-lattice polymers with Lennard-Jones monomer-monomer interaction and anharmonic springs by means of sophisticated variants of multicanonical Monte Carlo methods. We find that the low-temperature behavior depends strongly and nonmonotonicall…
Electroplated copper films are known to change their microstructure due to the self-annealing effect. The self-annealing effect of electroplated copper films was investigated by measuring the time dependence of the film stress and sheet resistance for different layer thicknesses between 1.5 and 20 ¿m. While the sheet…
Polymer coffee rings: Evaporation of diblock copolymer solutions confined in a sphere-on-flat geometry yields concentric serpentine microstructures over large areas (see picture, left). Selective solvent vapor annealing then transforms these microstructures into a macroscopic pattern of regularly arranged microporous…
Using molecular dynamics simulations, we show clear evidence for the nonlocal mesoscopic nature of the anomalous viscous transport in a supercooled liquid and its direct link to dynamic heterogeneity: (i) a distinct crossover from the microscopic to macroscopic viscosity at a mesoscopic length scale, which is comparab…
Junctions between different carbon nanotubes are created using cobalt particles as central nodes (see image). The process involves high temperature and electron irradiation of areas where a metal particle is located at the overlapping region of two nanotubes. In situ transmission electron microscopy measurements show…
Pure BaTiO 3 ceramics with various grain sizes were prepared by a conventional sintering method, a two-step sintering method, and a rate-controlled two-step sintering method. The permittivity of the ceramics increased with decreasing grain size when the grain size was more than 1.1 µm, while that decreased when the gr…
We report an accurate and robust interatomic pair potential for the technologically important transparent conducting oxide indium sesquioxide (In 2 O 3 ). The potential is optimized for the thermodynamically stable bixbyite phase, and it is then used to explore the relative stability and physical properties of five se…
Rare-earth-activated BaY(2)Si(3)O(10) (BYSO) phosphors were synthesized via a solid-state reaction. BaY(2)Si(3)O(10):Ce(3+) yields an indigo-blue emission peak at 404 nm according to excitation at 334 nm attributed to the Ce(3+) 4f-->5d transition. BaY(2)Si(3)O(10):Tb(3+) typically generates green emission peaks resul…
The basic mechanical properties of antiperovskite manganese nitride, Mn 3 Cu 1− x Ge x N, known as an isotropic negative thermal expansion (NTE), have been evaluated. The mother material, Mn 3 CuN, was a soft and ductile intermetallic compound with a positive linear thermal expansion coefficient (α=+20 × 10 −6 K −1 )…
Size-controlled ZnSe nanoparticles with high extents of atomic positional order are shown to exhibit large size-dependent variations in their local electronic environments. Solid-state ;{77}Se and ;{67}Zn NMR spectra reveal increasingly broad distributions of ;{77}Se and ;{67}Zn environments with decreasing nanopartic…
We investigate the Josephson current in a graphene superconductor/normal/superconductor junction, where superconductivity is induced by means of the proximity effect from external contacts. We take into account the possibility of anisotropic pairing by also including singlet nearest-neighbor interactions, and investig…
Using density-functional theory (DFT) calculations, the formation energies, electron affinities and electronic levels of various intrinsic defects in bulk ${\text{LaAlO}}_{3}$ are investigated. Results give the atomic structures of charged interstitials, vacancies, Frenkel pairs, antisite defects, and Schottky defects…
The origin of complex superstructures of biomaterials in biological systems and the amazing self-assembly mechanisms of their emergence have attracted a great deal of attention recently. Mimicking nature, diverse kinds of hydrophilic polymers with different functionalities and organic insoluble matrices have been desi…
BACKGROUND: Adoptive cell therapy with allogenic NK cells constitutes a promising approach for the treatment of certain malignancies. Such strategies are currently limited by the requirement of an efficient protocol for NK cell expansion. We have developed a method using synthetic nanosized phosphonate-capped dendrime…
The phase relations and electrical properties of (1- x )(Bi 1/2 Na 1/2 )TiO 3 – x Ba(Al 1/2 Nb 1/2 )O 3 (abbreviated as BNT–BAN100 x ) ceramics were investigated in detail. The morphotropic phase boundary (MPB) between the rhombohedral ferroelectric and pseudocubic (tetragonal) relaxor phases of BNT–BAN100 x was deter…
A new strategy for the sintering of transparent lanthanum‐doped yttrium oxide was presented. This method is the extension of the well‐accepted two‐step sintering process for the densification of nanomaterials. The samples were firstly sintered at an intermediate temperature T1 (1450°C) in air. Then the temperature dec…
Using molecular dynamics simulations, we study the slow dynamics of a hard sphere fluid confined in a disordered porous matrix. The presence of both discontinuous and continuous glass transitions as well as the complex interplay between single-particle and collective dynamics are well captured by a recent extension of…
SrCu 3 Ti 4 O 12 , La 2/3 Cu 3 Ti 4 O 12 , and Bi 2/3 Cu 3 Ti 4 O 12 ceramics were representatively investigated to obtain a systematical understanding about the dielectric behaviors of the compositionally and structurally CaCu 3 Ti 4 O 12 ‐like oxides and the underlying related mechanism. In opposite to the literatur…
A colloidal suspension of exfoliated, layered cobalt oxide nanosheets has been synthesized through the intercalation of quaternary tetramethylammonium ions into protonated lithium cobalt oxide. According to atomic force microscopy, exfoliated nanosheets of layered cobalt oxide show a plateau-like height profile with n…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSyntheses of Biodegradable and Biocompatible Polymers by Means of Bismuth CatalystsHans R. KricheldorfView Author Information Institut für Technische und Makromolekulare Chemie, Bundesstrasse 45, D-20146 Hamburg, GermanyCite this: Chem. Rev. 2009, 109, 11, 5579–5594Publicatio…