Tetrathiafulvalene Cyclophanes and Cage Molecules
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Materials Literature
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Determination of the Intershell Conductance in Multiwalled Carbon Nanotubes
We report on the intershell electron transport in multiwalled carbon nanotubes (MWNTs). To do this, local and nonlocal four-point measurements are used to study the current path through the different shells of a MWNT. For short electrode separations $\ensuremath{\lesssim}1\text{ }\ensuremath{\mu}\mathrm{m}$ the curren…
Nanocomposites: issues at the interface
Carbon nanotubes (CNTs), whether single- or multi-walled (SWNT or MWNT, respectively), have, in an unparalleled fashion, grabbed the attention of both researchers and business leaders within the polymer community. The vast potential afforded by the unprecedented combination of mechanical, electrical, and thermal prope…
Infinite-layerLaNiO2: Ni1+is notCu2+
The Ni ion in $\mathrm{La}\mathrm{Ni}{\mathrm{O}}_{2}$ has the same formal ionic configuration $3{d}^{9}$ as does Cu in isostructural $\mathrm{Ca}\mathrm{Cu}{\mathrm{O}}_{2}$, but it is reported to be nonmagnetic and probably metallic whereas $\mathrm{Ca}\mathrm{Cu}{\mathrm{O}}_{2}$ is a magnetic insulator. From ab in…
Simple Template-Free Solution Route for the Controlled Synthesis of Cu(OH)2 and CuO Nanostructures
The controlled synthesis of Cu(OH) 2 nanowires and nanoribbons in a solution phase has been realized with high yield at low cost by simply dropping KOH and ammonia solutions into an aqueous solution of CuSO 4 at ambient temperature. It is demonstrated that the morphology of nanostructured Cu(OH) 2 is significantly inf…
CNT-reinforced ceramics and metals
Recent research on the incorporation of carbon nanotubes (CNTs) into ceramic and metal matrices to form composite structures is briefly reviewed, with an emphasis on processing methods, mechanical performance, and prospects for successful applications.
Clay/polymer composites: the story
Clay/polymer nanocomposites offer tremendous improvement in a wide range of physical and engineering properties for polymers with low filler loading. This technology can now be applied commercially and has received great attention in recent years. The major development in this field has been carried out over the last…
Some Interesting Things about Polysiloxanes
Poly(dimethylsiloxane) [-Si(CH3)(2)O-] is by far the most studied of the polysiloxanes and is known to exhibit some intriguing physical properties, in particular very high permeability to gases. Simulations are underway in an attempt to understand some of these peculiarities. In addition, other symmetrically substitut…
Digital Photoswitching of Fluorescence Based on the Photochromism of Diarylethene Derivatives at a Single-Molecule Level
Photochromic reactions of diarylethene derivatives were detected at a single-molecule level by using a fluorescence technique. Fluorescent photoswitching molecules in which photochromic diarylethene and fluorescent bis(phenylethynyl)anthracene units are linked through an adamantyl spacer were synthesized, and switchin…
Propagation in and scattering from a matched metamaterial having a zero index of refraction
Planar metamaterials that exhibit a zero index of refraction have been realized experimentally by several research groups. Their existence stimulated the present investigation, which details the properties of a passive, dispersive metamaterial that is matched to free space and has an index of refraction equal to zero.…
Electric Field Effect in Atomically Thin Carbon Films
We describe monocrystalline graphitic films, which are a few atoms thick but are nonetheless stable under ambient conditions, metallic, and of remarkably high quality. The films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands, and they exhibit a strong ambipolar el…
Two-photon absorption laser induced fluorescence on O and O3 in a dc plasma for oxidation of aluminum
It has been conjectured that atomic oxygen and ozone can have a great influence on the plasma oxidation of ultrathin aluminum for magnetic tunnel junctions. In order to measure the density of O and ozone, two-photon absorption laser induced fluorescence measurements are performed in the dc glow plasma that is used for…
Micrometer‐Sized Spherical Assemblies of Polypeptides and Small Molecules by Acid–Base Chemistry
Spontan entstehen Mikrokügelchen, wenn geladene Polyaminosäuren mit entgegengesetzt geladenen mehrwertigen organischen Ionen vereint werden. Die Kugeloberflächen sind chemisch aktiv und dienen als Template für die Kondensation von Kieselsäuren, wobei je nach Säure leere oder polymergefüllte Systeme erhalten werden (si…
Crystallization and preliminary X-ray analysis of the apo form ofEscherichia colitryptophanase
Tryptophanase from Escherichia coli is a pyridoxal phosphate-dependent homotetrametic enzyme with a subunit weight of 52 kDa. It has been crystallized in the apo form by the hanging-drop vapour-diffusion method using polyethylene glycol 400 as a precipitant and magnesium chloride as an additive. The crystals belong to…
Crystallization and preliminary X-ray crystallographic analysis of chorismate synthase fromMycobacterium tuberculosis
The enzymes of the shikimate pathway are potential targets for the development of new therapies because they are essential for bacteria but absent from mammals. The last step in this pathway is performed by chorismate synthase (CS), which catalyzes the conversion of 5-enolpyruvylshikimate-3-phosphate to chorismate. Op…
Investigations of multiphase states in vicinity of pressure‐induced phase transitions
Abstract In the present work equations have been derived for thermomagnetic and galvanomagnetic effects of multiphase systems. The equations allow us to analyse complex thermal–electrical–magnetic properties of semiconductors under variation of concentration and configuration of inclusions. The results obtained make i…
Synthesis and Functionalization of a New Kind of Silica Particle
Like a chlorinated golf ball aptly describes a new kind of chlorosiloxane particle (SixOyClz, CSN; see picture). Under suitable conditions they are formed by the reaction between SiCl4 and O2 in the gas phase. The surface of these spherical, amorphous particles is densely covered by chlorine atoms. These can be substi…
The growth and structure of double-diffusive cells adjacent to a cooled sidewall in a salt-stratified environment
Observations and measurements are reported on the patterns and rates of growth in time of the double-diffusive cells that form adjacent to a cooled sidewall in a saltstratified environment. Fluid near the wall is cooled and sinks a distance $h$ where its density, increased by cooling, matches that of the salt-stratifi…
Effect of H2on Formation Behavior of Carbon Nanotubes
The effect of <TEX>$H_2$</TEX> gas on the carbon nanotubes (CNTs) synthesis with CO-<TEX>$H_2$</TEX> gas mixture was investigated using mass measurements and scanning electron microscopy (SEM). The maximum weight and yield of the synthesized carbon were obtained when the mixture ratio of <TEX>$H_2$</TEX>: CO was 3 : 7…
Evolution of local electronic states from a metal to a correlated insulator in aNiS2−xSexsolid solution
The evolution of local electronic states in $\mathrm{Ni}{\mathrm{S}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x}$ pyrite as a bandwidth-controlled metal-insulator transition (MIT) approached from the metallic side is explored by scanning tunneling microscopy/spectroscopy (STM/STS). Atomically resolved images of $\mathrm{Se}∕\…