Materials Literature
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Abstract The crystallization of bimodal PDMS molecular‐weight blends consisting of long (115 kda) and short (5.3 kda) chains is investigated using DSC and proton NMR. In agreement with earlier studies, it is found that the pure long‐chain sample crystallizes more rapidly than the short‐chain sample. Furthermore, the r…
Strain dependence of electronic structure and transport properties of (6,0) carbon nanotubes has been thoroughly studied using first-principles calculations in conjunction with Green's function techniques. We have found that the quantum conductance is very sensitive to structural deformation and relaxation. The conduc…
Ungleich geteilt: Die kooperative CuII- und BIII-Metallierung von meso-Heptakis(pentafluorphenyl)[32]heptaphyrin (1) löst eine Extrusion aus, die zu BIII-meso-Tris(pentafluorphenyl)[14]subporphyrin (2) und einem CuII-Porphyrin (3-Cu) führt. Die optischen Eigenschaften des Subporphyrins 2 spiegeln die eingeschränkten R…
Abstract Nanoparticles of barium carbonate (BaCO 3 ) have been synthesized in situ from barium chloride by the slow release of carbon dioxide by alkaline hydrolysis of diethyl carbonate, and stabilized by cetyltrimethylammonium bromide (CTAB) at the water/hexamethylene interface. Transmission electron microscopy, Four…
A crucial step towards the goal of tissue engineering a heart valve will be the choice of scaffold onto which an appropriate cell phenotype can be seeded. Successful scaffold materials should be amenable to modification, have a controlled degradation, be compatible with the cells, lack cytotoxicity and not elicit an i…
In this Article, we describe a carbon nanotube formation model in which sp2 carbon hemispheres form the embryonic caps from which a nanotube can grow. This requirement leads to a single wall carbon nanotube formation window concomitant with our systematic experimental findings, which show upper and lower diameter limi…
Mixed liquid crystals consisting of the smectic-A phase of 8CB and 8 nm GaSe nanoparticles have been formed and studied using static and time-resolved optical polarization spectroscopy. The mixtures consist mostly of 8CB, with a small volume fraction of the nanoparticles. Polarized absorption spectra indicate that the…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTSynthesis of Chain End Functionalized Fluoropolymers by Functional Borane Initiators and Application in the Exfoliated Fluoropolymer/Clay NanocompositesZhi-Cheng Zhang, Zhiming Wang, and T. C. Mike ChungView Author Information Departmen…
The study of the plasticization of corn-starch granules through the bulk oxypropylation of their outer shell produced a novel biphasic material consisting of a low glass transition temperature component surrounding the granules' inner core, which could be hot pressed to form films of the granules dispersed into a ther…
Hex, hex: Das gezeigte heteroatomstabilisierte, ringförmig anellierte Hexapyrrolohexaazacoronen wurde als Repräsentant einer neuen Klasse stickstoffhaltiger Moleküle mit ausgedehnten π-Systemen synthetisiert und isoliert. Sein reversibles Redoxverhalten, eine Folge der inneren N-Atome, lässt an Anwendungen in der orga…
We have studied suspended nanotube devices to investigate directly the impact of oxide substrate on the properties of nanotubes. The 1/ f noise amplitude is reduced by about one order of magnitude when the nanotube is suspended, suggesting that the 1/ f noise is dominated by the trapped charges in the oxide. We have a…
Anchoring quantum dots (QDs) onto thermodynamically stable, large band gap oxide semiconductors is a very important strategy to enhance their quantum yields for solar energy conversion in both visible and near-IR regions. We describe a general procedure for anchoring a few chalcogenide QDs onto the titanium oxide laye…
The problem of the thickness dependence of the dielectric constant, as well as the extrinsic contributions to its value, is analyzed for the case of epitaxial $\mathrm{Pb}(\mathrm{Zr},\mathrm{Ti}){\mathrm{O}}_{3}$ (PZT) thin films. It is shown that the frequency dependence of the measured capacitance is best simulated…
Modification of the physical and optical properties of the frustule of the diatom Coscinodiscus wailesii by nickel sulfate, Townley, Helen E, Woon, Kai Lin, Payne, Frank P, White-Cooper, Helen, Parker, Andrew R
The electronic structure of $\mathrm{Pb}\mathrm{Se}∕\mathrm{Pb}\mathrm{S}$ core-shell quantum dots (QDs) is calculated within a four-band envelope function formalism. The effective mass approximation used successfully to model PbS and PbSe core QDs is extended to include discontinuities in material parameters. The mod…
We study electronic transport through an n-p junction in graphene irradiated by an electromagnetic field (EF). In the absence of EF one may expect the perfect transmission of quasiparticles flowing perpendicular to the junction. We show that the resonant interaction of propagating quasiparticles with the EF induces a…
A modified sol–gel approach is used for the preparation of stable silica materials based on a surfactant-encapsulated polyoxometalate (see figure, top panel). In this hybrid material, the luminescence properties of the polyoxometalate and the processibility of the sol–gel matrix are synergistically combined (see figur…
A new type of supramolecular building block, Zn(II)-salpyr [salpyr = N,N'-3-pyridylenebis(salicylideneimine)], is described that contains both a pyridyl donor and a Lewis acidic Zn(II) acceptor site in the salen framework. As a consequence, this building block self-organizes into a stable tetrameric vase structure via…
We formulate the problem of electron transport through a single-molecule magnet (SMM) in the Coulomb blockade regime taking into account topological interference effects for the tunneling of the large spin of a SMM. The interference originates from spin Berry phases associated with different tunneling paths. We show t…
Collagens, characterized by a unique triple-helical structure, are the predominant component of extracellular matrices (ECMs) existing in all multicellular animals. Collagens not only maintain structural integrity of tissues and organs, but also regulate a number of biological events, including cell attachment, migrat…