Materials Literature
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The influence of molecular weight and arm number of star polymers on the buildup and pH-dependent morphology changes of multilayer films assembled from star poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) and linear poly(styrenesulfonate) (PSS) was systematically investigated. Well-defined star PDMAEMA, consisting…
Ordnung im amorphen Zustand: Die Struktur von amorphem Calciumcarbonat (ACC) weist Bezüge zu den kristallinen Polymorphen Calcit und Vaterit auf. Die protokristallinen Strukturen von Calcit und Vaterit – pc-ACC und pv-ACC – wurden NMR- (siehe Bild), IR- und EXAFS-spektroskopisch analysiert; dabei stellte sich heraus,…
Using scanning tunneling microscopy and spectroscopy, in combination with density functional theory calculations, we investigated the morphology and electronic structure of monolayer graphene grown on the (111) and (110) facets of three-dimensional nickel islands on highly oriented pyrolytic graphite substrate. We obs…
We have prepared polyvinylalcohol-SWNT fibers with diameters from ∼1 to 15 μm by coagulation spinning. When normalized to nanotube volume fraction, V(f), both fiber modulus, Y, and strength, σ(B), scale strongly with fiber diameter, D: Y/V(f) ∝ D(-1.55) and σ(B)/V(f) ∝ D(-1.75). We show that much of this dependence is…
In this article, we presented a general protocol to prepare biomolecule-immobilized mussel-inspired polydopamine (PDA) coatings to improve the blood compatibility of broad ranges of material surfaces. It needs only a simple immersion of substrates in dopamine solution at alkaline pH to form mussel-inspired PDA coating…
We study the pairing mechanism in iron pnictide superconductors based on the five-orbital Hubbard-Holstein model. Due to Fe-ion oscillations, the $s$-wave superconducting (SC) state without sign reversal (${s}_{++}$-wave state) is induced by orbital fluctuations by using realistic model parameters. The virtue of the p…
A new family of layered rare-earth hydroxides rigidly pillared by sulfate ions has been synthesized through homogeneous precipitation of lanthanide sulfate salts driven by hydrolysis of hexamethylenetetramine. Obtained materials were composed of aggregated thin platelet microcrystallites. Chemical analysis indicates t…
We have studied the effect of the misfit on the equilibrium shape of three-dimensional pyramidal islands grown on a foreign substrate in the case of incomplete wetting (Volmer-Weber mode of growth). We have found that tensile islands have smaller aspect ratios compared with compressed islands owing to its better adhes…
The successful evaporation of thick and thin films of an intact bis(phthalocyaninato)terbium single molecule magnet is reported and confirmed by chemical and magnetic characterization techniques. Synchrotron-based X-ray absorption spectroscopy reveals different magnetization dynamics associated to a change in the orie…
Many neurotrophic factors have been shown to promote neurite outgrowth by improving the microenvironment that is required for nerve regeneration. However, the delivery of these bioactive agents to the nerve injury site, as well as effective and local release, remains a challenging problem. We have developed a novel co…
A closer look at the title reaction pinpoints a surprising mechanism—a relatively rapid preequilibrium between cyclopentadienyl complex 2 and fulvalene diradical complex 1 precedes the rate-determining anti–syn rotation and formation of the RuRu bond. The computed energy values agree well with all experimental data,…
Abstract Dieser Aufsatz soll einen Überblick über die jüngsten Entwicklungen auf dem Gebiet der porösen organisch‐anorganischen oder rein organischen Funktionsmaterialien geben. Verschiedene Möglichkeiten zum Einbau organischer Gruppen, die eine chemische oder physikalische Funktion aufweisen, in poröse Netzwerke werd…
Hydroxypropyl methylcellulose (HPMC) is employed for a wide variety of pharmaceutical and food preparations. Its applications as viscolizing agent (thickening agent), coating polymer, bioadhesive, in solid dispersion to enhance solubility, binder in the process of granulation and in modified release formulations have…
Strong Raman scattering is observed from iodine anions adsorbed at ca. 3% coverage on single layer graphene. In addition, the Raman signal from just one bromine intercalation layer inside three and four layer thick graphenes is observed. We analyze and model the intramolecular electronic, charge-transfer, and multiple…
Deep subwavelength integration of high-definition plasmonic nanostructures is of key importance for the development of future optical nanocircuitry for high-speed communication, quantum computation and lab-on-a-chip applications. So far the experimental realization of proposed extended plasmonic networks consisting of…
We report on the growth of nanostructured rods fabricated by electrostatic co-assembly between iron oxide nanoparticles and polymers. The nanoparticles put under scrutiny, γ-Fe2O3 or maghemite, have diameter of 6.7 nm and 8.3 nm and narrow polydispersity. The co-assembly is driven by i) the electrostatic interactions…
Crystal plasticity is the result of the motion and interaction of dislocations. There is, however, still a major gap between microscopic and mesoscopic simulations and continuum crystal plasticity models. Only recently a higher dimensional dislocation density tensor was defined which overcomes some drawbacks of earlie…
We report on a systematic study of a number of structurally identical but chemically distinct transition metal oxides in order to determine how the material-specific properties such as the composition and the strain affect the properties at the interface of heterostructures. Our study considers a series of structures…
The magnetic, dielectric, and magnetodielectric properties of La 2 CoMnO 6 ceramics were evaluated together with the polarization‐electric field hysteresis loops. The phase segregation consisting of ordered and disordered regions was determined in the present ceramics. The ordering of Co 2+ and Mn 4+ gave rise to ferr…
Theory has predicted rich and very distinct physics for graphene devices with boundaries that follow either the armchair or the zigzag crystallographic directions. A prerequisite to disclose this physics in experiment is to be able to produce devices with boundaries of pure chirality. Exfoliated flakes frequently exhi…