Materials Literature
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We study the phase behavior and structure of highly asymmetric binary hard-sphere mixtures. By first integrating out the degrees of freedom of the small spheres in the partition function we derive a formal expression for the effective Hamiltonian of the large spheres. Then using an explicit pairwise (depletion) potent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structures of Molecular Gold Nanocrystal ArraysRobert L. Whetten, Marat N. Shafigullin, Joseph T. Khoury, T. Gregory Schaaff, Igor Vezmar, Marcos M. Alvarez, and Angus WilkinsonView Author Information Schools of Physics & Chemistry, Georgia Institute of Technology, A…
CuO nanoparticles were successfully prepared by a one-step solid-state reaction under ambient conditions. Three pellet samples with different grain sizes were obtained by annealing at high temperature. The room temperature Raman spectra of these samples show that as the grain size decreases, the Raman peaks shift to l…
Carbon nanotubes are cylindrical molecules with a diameter of as little as 1 nanometer and a length up to many micrometers. They consist of only carbon atoms, and can essentially be thought of as a single layer of graphite that has been wrapped into a cylinder, (See figure 1 and the article by Thomas Ebbesen in PHYSIC…
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The size and temperature dependence of the plasmon absorption is studied for 9, 15, 22, 48, and 99 nm gold nanoparticles in aqueous solution. The plasmon bandwidth is found to follow the predicted behavior as it increases with decreasing size in the intrinsic size region (mean diameter smaller than 25 nm), and also in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanotubes from CarbonP. M. AjayanView Author Information Department of Materials Science & Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590 Cite this: Chem. Rev. 1999, 99, 7, 1787–1800Publication Date (Web):May 1, 1999Publication History Received29 Ju…
New rezults of studies on the electron density of silicates are considered in accordance with the traditional structural classification. Precision X-ray diffraction data and rezults of structure refinement based on high-angle and multipole models are discussed. Bonded radii, charges on anoms and bond ionicities in Si,…
A simple two-step design strategy has been developed for the synthesis of a large variety of a new class of tyrosine-based aromatic (Ph or Pyr) bridged cyclodepsipeptides (tyrosinophanes). The design is flexible with respect to the size of the ring and the nature of the bridging unit and permits the incorporation of a…
To use the all-tetrahedral mesh generation capabilities existing today, we have explored the creation of a computationally efficient eight-node tetrahedral finite element (a four-node tetrahedral finite element enriched with four mid-face nodal points). The derivation of the element's gradient operator, studies in obt…
Silsesquioxanes constitute a diverse range of Si-O frameworks with a wide variety of intriguing possibilities as models for catalysis. These topologically interesting molecules are formed by the hydrolytic condensation of trifunctional organosilanes. Heterosilsesquioxanes are formally derived by substitution of a main…
The data on compatibility and on the properties of polymer blends are generalised. The emphasis is placed on the formation of strong intermolecular interactions (dipole–dipole interaction and hydrogen bonding) between the components of blends, as well as on the chemical reactions between them. A criterion for the pred…
A systematic study is reported on the monolayer characteristics of ytterbium bisphthalocyanine (YbPc 2 ) at the air−water interface, using surface pressure and surface potential isotherms. The influence of various experimental parameters was analyzed, including compression speed, spreading volume, position of the pres…
An emulsification curve which tracks the change in dispersed phase size with interfacial modifier concentration and a fracture mechanics approach have been used to study the behavior of a variety of well-defined interfacial modifiers for a melt-processed ethylene−propylene rubber (EPR)/polystyrene (PS) blend. In this…
In this study, we report the ultrafast dissociation and recombination dynamics of I 2 enclosed in well-defined cages formed by the electroneutral host framework of the crystalline microporous SiO 2 modification decadodecasil 3R (DDR). In this composite, each cage is occupied by one guest molecule, corresponding to a h…
High Pure Wurtzite structure GaN has been synthesized by gas reaction method. Its structure was determined by powder X-ray diffraction using the Rietveld technique. The positions in the unit cell for Ga and N were refined to be (0, 0, 0) and (0, 0, 0.3814). The Debye temperature was determined as 586 K from the refine…
In off-equilibrium dynamics we define a dynamical correlation length that is proportional to the size of the region in which the atoms move in a correlated way. General arguments indicate that this dynamical correlation length diverges at large times in the glassy phase. Numerical simulations for binary mixtures are c…
The synthesis of a series of vinyl-substituted silphenylene siloxane polymers of high molecular weight is described. 29 Si NMR spectroscopy indicates that the polymers possess an exactly alternating microstructure of the silphenylene and siloxane moieties. The materials are completely amorphous with glass transition t…
Geraniol and its 1-methyl derivative (regiochemical probes) and a set of methyl- and tert-butyl-substituted chiral allylic alcohols (stereochemical probes) have been used to elucidate the mechanism of the MTO-catalyzed epoxidation of allylic alcohols. The regiochemical probes are preferentially epoxidized at the unfun…
α-CsPbBi 3 Se 6 ( I ), β-CsPbBi 3 Se 6 ( II ), RbPbBi 3 Se 6 ( III ), KPbBi 3 Se 6 ( IV ), CsPbBi 3 S 6 ( V ), and RbPbBi 3 S 6 ( VI ) were synthesized by the polychalcogenide flux method. α-CsPbBi 3 Se 6 was obtained at 720 °C and crystallizes in the space group Pnma (no. 62) with a = 23.564(6) Å, b = 4.210(2) Å, c =…