Chemistry of Thiacalixarenes
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Scaling of Excitons in Carbon Nanotubes
Light emission from carbon nanotubes is expected to be dominated by excitonic recombination. Here we calculate the properties of excitons in nanotubes embedded in a dielectric, for a wide range of tube radii and dielectric environments. We find that simple scaling relationships give a good description of the binding e…
Mechanical properties and structural characteristics of PP/PP‐g‐SBR nanocomposites prepared by dynamical photografting
Abstract Poly(propylene) (PP)/PP grafted styrene‐butadiene rubber (PP‐g‐SBR) nanocomposite was prepared by blending PP with PP‐g‐SBR using dynamical photografting. The crystal morphological structure, thermal behavior, and mechanical properties of PP/PP‐g‐SBR nanocomposites have been studied by photoacoustic Fourier t…
Hydrothermal Route to InAs Semiconductor Nanocrystals
Spherical InAs nanocrystals of 30-50 nm were hydrothermally synthesized at 120 degrees C, which showed a 100 meV-blueshift of band gap absorption and phonon confinement of optical vibration mode. The study of hydrothermal formation mechanism indicated that crystalline InAs could be obtained in an extended pH range (ap…
Dissolution of milled-silicate rock fertilisers in the soil
Dissolution of dry-milled basalt, dolerite, gneiss, and K-feldspar added to 23 soils has been related to milling time and soil properties. The rocks milled for 10, 60, and 120 min were mixed with 23 type of soils from south-western Australia at a rock/soil ratio of 1/100 (≈10 t/ha), wetted to 110% field capacity, then…
SPEDEN: reconstructing single particles from their diffraction patterns
SPEDEN is a computer program that reconstructs the electron density of single particles from their X-ray diffraction patterns, using a single-particle adaptation of the holographic method in crystallography [Szöke, Szöke & Somoza (1997). Acta Cryst. A53, 291-313]. The method, like its parent, is unique because it does…
Structure determination ofSi(001)−c(4×2)surfaces at80Kand electron beam effect below40Kstudied by low-energy electron diffraction
We have studied the structures of the $\text{Si}(001)\text{\ensuremath{-}}c(4\ifmmode\times\else\texttimes\fi{}2)$ surfaces using low-energy electron diffraction analysis at $80\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The asymmetric dimer model was optimized, and obtained structural parameters were almost identical wit…
Monte Carlo simulation of the Compton scattering technique applied to characterize diagnostic x‐ray spectra
The quality control of x-ray tubes for medical radiodiagnostic services is very important for such devices. Therefore, the development of new procedures to characterize the x-ray primary beam is highly interesting in order to obtain an accurate assessment of the actual photon spectrum. The Compton scattering technique…
Spin polarization of the transport current at the free surface of bulkNiMnSb
The point contact Andreev reflection employing niobium tips was used to determine the degree of transport current spin polarization $({P}_{t})$ at the free surface of bulk $\text{NiMnSb}$ at $4.2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The data was analyzed within the framework of a modified version of the Blonder, Tin…
Self-assembled uniaxial and biaxial multilayer structures in chiral smectic liquid crystals frustrated between ferro- and antiferroelectricity
With a view to obtain a molecular model for the subphases produced by the frustration between ferro- and antiferroelectricity in chiral smectic liquid crystals, we report results on two compounds and observe (i) the staircase character of uniaxial Sm C(*)(alpha) itself in the bulk and (ii) the multipeaked characterist…
Shear-Induced Mesophase Organization of Polyanionic Rigid Rods in Aqueous Solution
ADVERTISEMENT RETURN TO ISSUEPREVNoteShear-Induced Mesophase Organization of Polyanionic Rigid Rods in Aqueous SolutionTakafumi Funaki, Tatsuo Kaneko, Kanji Yamaoka, Yutaka Ohsedo, Jian Ping Gong, Yoshihito Osada, Yuzo Shibasaki, and Mitsuru UedaView Author Information Division of Biological Sciences, Graduate School…
A semi-empirical approach for modeling charged soft microgel particles
We describe a unified semi-empirical approach for predicting the viscosity of dilute and concentrated hard and soft sphere systems. A variable specific volume, k was introduced to convert the mass concentration to effective volume fraction. With increasing particle concentration, the concentration of free counter-ions…
Stable sonoluminescence within a water hammer tube
The sonoluminescence (SL) from the collapse of a single gas bubble within a liquid can be produced repetitively using an acoustic resonator. An alternative technique using a water hammer tube, producing SL from bubbles of greater size, is described here. A sealed vertical tube partly filled with a liquid and a gas at…
Influence of dispersed-phase elasticity on steady-state deformation and breakup of droplets in simple shearing flow of immiscible polymer blends
The effect of dispersed-phase elasticity on steady-state deformation and breakup of isolated droplets for polybutadiene/poly(dimethyl siloxane) blends in simple shearing flow is investigated systematically for values of the dispersed-phase Weissenberg number (Wid) ranging up to around 3, where the Weissenberg number i…
Ferromagnetism in Cr-doped GaN: A first-principles calculation
Electronic structure, energy bands, and magnetic properties of Cr-doped GaN have been calculated from first principles using a 32 atom supercell within the frame work of linearized muffin-tin orbital tight binding method and gradient-corrected density-functional theory. The coupling between Cr atoms is found to be fer…
Microstructure of plasma-deposited SiO2/TiO2 optical films
SiO 2 and TiO2, with their high refractive index contrast, are interesting candidates for the fabrication of graded-index optical filters. In this work, SiO2/TiO2 mixtures were prepared by plasma-enhanced chemical vapor deposition from SiCl4 and TiCl4. By controlling the gas flow ratio, it is possible to obtain coatin…
AUXOSPORE FORMATION AND THE MORPHOLOGY OF THE INITIAL CELL OF THE MARINE ARAPHID DIATOM GEPHYRIA MEDIA (BACILLARIOPHYCEAE)1
Recent studies have led to a rapid increase in knowledge of auxospore formation in diatoms. However, these studies have been limited to centric and raphid pennate diatoms, and there is still very little information for the araphid pennate diatoms. Using LM and SEM, we studied the development of the auxospore and the i…
Wedge‐Shaped Molecules with a Sulfonate Group at the Tip—A New Class of Self‐Assembling Amphiphiles
The synthesis of 4-N-[3',4',5'-tris(dodecyloxy)benzamido]benzene-4-sulfonic acid (1) and 4'-[3",4",5"-tris(dodecyloxy)benzoyloxy]azobenzene-4-sulfonic acid (2) is described. Pure acid 1 is stable, while 2 can be stored only in solution. Both acids were obtained from their sodium salts and were quantitatively transform…
Jamming Threshold of Dry Fine Powders
We report a novel experimental study on the jamming transition of dry fine powders with controlled attractive energy and particle size. Like in attractive colloids dry fine particles experience diffusion-limited clustering in the fluidlike regime. At the jamming threshold fractal clusters crowd in a metastable state a…
Self‐Assembly of Small Peptidomimetic Cyclophanes
The self-assembly of a series of small peptidomimetic cyclophanes in organic solvents was studied. X-ray diffraction, NMR spectroscopy, and molecular modelling were used to understand the structural features of these self-assembling compounds both at the molecular and supramolecular level. The factors that could influ…