Materials Literature
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Disc-shaped hexa-peri-hexabenzocoronenes (HBCs) peripherally substituted by flexible dodecyl chains (molecule 1) or rigid polyphenylene dendrons (molecules 2a,b and 3) were efficiently synthesized. Steric hindrance arising from the substituents, from less hindered dodecyl to bulky dendrons, was utilized to program the…
By taking careful account of slab thickness and adsorbate orientation effects we present, for the first time, periodic density functional calculations predicting the preference of water to adsorb in a molecular state on the ideal rutile TiO2(110) surface at all coverages < or =1 monolayer (ML). Moreover, while this ha…
The polarized Raman spectra of layered ruthenates of the Srn+1RunO3n+1 (n=1,2,3) Ruddlesden-Popper series were measured between 10 and 300 K. The phonon spectra of Sr3Ru2O7 and Sr4Ru3O10 confirmed earlier reports for correlated rotations of neighboring RuO6 octahedra within double or triple perovskite blocks. The obse…
We show by ab initio calculations that the electron-phonon coupling matrix element M of the radial breathing mode in single-walled carbon nanotubes depends strongly on tube chirality. For nanotubes of the same diameter the coupling strength |M|^2 is up to one order of magnitude stronger for zig-zag than for armchair t…
We present a method for the determination of the local concentrations of interstitial and substitutional Mn atoms and As antisite defects in GaMnAs. The method relies on the sensitivity of the structure factors of weak reflections to the concentrations and locations of these minority constituents. High spatial resolut…
X-ray diffraction studies on a $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ (PZN) single-crystal sample show the presence of two different structures. An outer layer exists in the outer most $\ensuremath{\sim}10$ to $50\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{m}$ of the crystal, and…
The swelling behavior of layer-by-layer assemblies of poly(styrenesulfonate) sodium salt (PSS) and poly(allylamine hydrochloride) (PAH) with various number of layers were investigated. The data presented in this paper suggest that swelling and deswelling are completely reversible and reproducible. At 99% relative humi…
The search for macroscopic magnetic ordering phenomena in organic materials, in particular in pure graphite, has been one of the more exciting scientific activities working in the frontiers of physics, chemistry, and materials science. In this Letter we report on a novel chemical route leading to undoubtedly obtain ma…
As the dimensions of electronic devices approach those of molecules, the size, geometry and chemical composition of the contact electrodes play increasingly dominant roles in device functions. It is shown here that single-walled carbon nanotubes (SWNT) can be used as quasi one-dimensional (1D) electrodes to construct…
We report a method for describing plasticity in a broad class of amorphous materials. The method is based on nonlinear (geometric) deformation theory allowing the separation of the plastic deformation from the general deformation tensor. This separation allows an adequate pattern of thermodynamical phenomena for plast…
The speed of longitudinal sound waves at 7 and 22 MHz has been measured in liquid, supecooled, and amorphous selenium, including the region around the glass transition temperature, Tg, near 35 C. In amorphous selenium the speed of shear waves at 7 MHz was also measured. The experiments were performed with high purity…
Single crystal In(OH) 3 nanocubes were synthesized by a designed novel hydrothermal treatment, and the size can be simply moderated by varying the hydrothermal temperature. By calcining the In(OH) 3 nanocubes in air at 400 °C, single crystal In 2 O 3 nanocubes were also prepared with the size slightly shrinking. Room…
The scalable superacid solvent, radical-initiated aryldiazonium functionalization process produces individual SWNTs without the need for surfactant wrapping, centrifugation, or sonication. This work provides a facile pathway to aryl sulfonic acid-functionalized SWNTs that are not roped or bundled, and the functionaliz…
Alloying with Si is shown to destabilize the strongly bound hydrides LiH and MgH 2 . For the LiH/Si system, a Li 2.35 Si alloy forms upon dehydrogenation, causing the equilibrium hydrogen pressure at 490 °C to increase from approximately 5 × 10 -5 to 1 bar. For the MgH 2 /Si system, Mg 2 Si forms upon dehydrogenation,…
Porous microparticles of calcium carbonate with an average diameter of 4.75 microm were prepared and used for protein encapsulation in polymer-filled microcapsules by means of electrostatic layer-by-layer assembly (ELbL). Loading of macromolecules in porous CaCO3 particles is affected by their molecular weight due to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanostructured Oxides in Chemistry: Characterization and PropertiesM. Fernández-García, A. Martínez-Arias, J. C. Hanson, and J. A. RodriguezView Author Information Instituto de Catálisis y Petroleoquímica, CSIC, C/ Marie Curie s/n, Campus Cantoblanco, 28049-Madrid, Spain, an…
Periodic luminescent patterns based on active color centers have been efficiently created in Lithium Fluoride (LiF) crystals and films by Extreme Ultra-Violet (EUV) light and soft x-rays from a laser-plasma source by masking the incoming radiation. Strong visible photoluminescence at room temperature has been measured…
Density functional calculation are performed to study Ti(8)C(12) isomers (T(d), C(3v), and D(2d)) in the neutral, cationic, and anionic charge states. C(3v) symmetry is found to be the most stable geometry for the neutral and anion, and the C(3v) and D(2d) isomers to be quasi-iso-energetic lowest for the cation. The e…
We have carried out first principles plane wave density-functional theory calculations to study the adsorption of CO molecule on a clean and unreconstructed Cu (110) surface at 1/12 monolayer coverage and have investigated the subsequent oxidation by preadsorbed oxygen atoms. As found experimentally, the CO adsorbs pe…
Katherine A. Kantardjieff, Mortaza Jamshidian, Bernhard Rupp; Distributions of pI versus pH provide prior information for the design of crystallization screenin