Materials Literature
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Formation of a stable self-assembled monolayer film of a functionalized diacid, protoporphyrin IX Zn(II), on Au surface is reported. On the basis of UV−vis and infrared data, it is concluded that the porphyrin is chemically bound to the Au surface via one of the two COOH groups. The other COOH group remains unbound to…
Principles, experimental techniques, and applications of enantioselective quenching of lanthanide luminescence are addressed. Upon the addition of chiral, enantiomerically resolved quencher molecules to an aqueous, racemic solution of the tris (pyridine-2,6-dicarboxylate) chelate of Eu(III) or Tb(III), strong quenchin…
The compounds Na 2 Ti 2 Pn 2 O (Pn = As, Sb) crystallize in the anti-K 2 NiF 4 structure type in the space group, I 4/ mmm, with Z = 2 and the lattice parameters a = 4.0810(9) Å and c = 15.311(3) Å for the As analogue at 310 K and a = 4.160(2) Å and c = 16.558(7) Å for the Sb analogue at 150 K. The structure consists…
An experimental and theoretical study of the oxidation of methanol in the absence and in the presence of NO has been performed. The experiments were conducted in an isothermal quartz flow reactor at atmospheric pressure in the temperature range 700−1500 K. The influence of the temperature, oxygen concentration, and pr…
Polycondensation of 1,2-cyclohexane dicarboxylic anhydride with a calculated molar excess of di-2-propanolamine led to bis(2-hydroxyalkyl)amide based hydroxy-functional hyperbranched polyesteramides in a straightforward manner. Modification reactions of these polymers with lauric esters was conducted in different synt…
The low-temperature Hall resistivity ${\ensuremath{\rho}}_{\mathrm{xy}}$ of ${\mathrm{La}}_{2/3}{A}_{1/3}{\mathrm{MnO}}_{3}$ single crystals (where A stands for Ca, Pb, and Ca, or Sr) can be separated into ordinary and anomalous contributions, giving rise to ordinary and anomalous Hall effects, respectively. However,…
Ten 1:1 and 2:1 complexes of [Mn(CO)(3)](+) and [Re(CO)(3)](+) with [Nb(6)O(19)](8)(-) and [Ta(6)O(19)](8)(-) have been isolated as potassium salts in good yields and characterized by elemental analysis, (17)O NMR and infrared spectroscopy, and single-crystal X-ray structure determinations. Crystal data for 1 (t-Re(2)…
We investigate the band-gap modification by radial deformation in BN and ${\mathrm{BC}}_{3}$ nanotubes through first-principles pseudopotential density-functional calculations. In zigzag BN nanotubes, radial deformations that give rise to transverse pressures of about 10 GPa decrease the gap from 5 to 2 eV, allowing f…
In this paper we present a modeling approach to bridge the atomistic with macroscopic scales in crystalline materials. The methodology combines identification and modeling of the controlling unit processes at microscopic level with the direct atomistic determination of fundamental material properties. These properties…
Nanocrystalline ${\mathrm{NiFe}}_{2}{\mathrm{O}}_{4}$ spinel has been synthesized with various grain sizes by high-energy ball milling. From the high-field magnetization studies and extended x-ray-absorption fine-structure, and M\"ossbauer measurements in an external magnetic field of 5 T applied parallel to the direc…
We report on the synthesis, structure, and self-assembly of single-wall subnanometer-diameter molybdenum disulfide tubes. The nanotubes are up to hundreds of micrometers long and display diverse self-assembly properties on different length scales, ranging from twisted bundles to regularly shaped "furry" forms. The bun…
The growth of amorphous carbon thin film on a [111] diamond surface has been studied by a tight-binding molecular dynamics technique. Six different three-dimensional networks were constructed with periodic boundary conditions in two dimensions. Time-dependent nonequilibrium growth was simulated and densities, radial d…
High-resolution transmission electron microscopy (HRTEM) results show a strong crystal-chemical dependence on the mode of dissolution of synthetic heterogenite (CoOOH) particles via ligand-assisted dissolution using iminodiacetic acid (IDA) and reductive dissolution using hydroquinone (H 2 Q). Dissolution, using H 2 Q…
V danem clanku jsou uvedeny výsledky zkoumani změn v oduhlicovani a tvrdosti Fe-C-Cr-Mn-Si oceli způsobene vysokoteplotni povrchovou oxidaci okolnim vzduchem.
The coupling between the structure of the tilted condensed phases of docosanoic acid monolayers (L 2, L 2 ‘, and Ov) and an external shear flow has been studied using Brewster angle microscopy. Generally, the coupling results in a reorientation of the alkyl tails, although different kinematics are observed depending o…
We investigate the properties of long-chain alkyl xanthate-capped platinum nanoparticles. First an uncapped platinum colloid, 4.0 ± 1 nm in diameter, is produced in an aqueous phase, and then the capping agent is added. The capped particles are hydrophobic and easily transfer into organic solvents. They can be dried a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolymerization of a Phosphonium Diene Amphiphile in the Regular Hexagonal Phase with Retention of MesostructureBradford A. Pindzola, Benjamin P. Hoag, and Douglas L. GinView Author Information Department of Chemistry, University of California Berkeley, California 94720…
The NaOH-catalyzed hydrolytic condensation of the reaction product between N -(β-aminoethyl)-γ-aminopropyltrimethoxysilane and phenyl glycidyl ether (PGE) was followed by matrix-assisted ultraviolet laser desorption/ionization time-of-flight mass spectrometry (UV-MALDI-TOF MS) and electrospray ionization time-of-fligh…
To study possible interactions between semiconductor nanocrystals, crystalline superstructures of Cd 17 S 4 (SCH 2 CH 2 OH) 26 have been studied spectroscopically. Interactions between the particles have been detected which are discussed with simple models including electronic and dipole−dipole interactions.
The temperature dependence of the thermal conductivity, low-field/high-field magnetization, and magnetic ac susceptibility under different hydrostatic pressures have been measured on single-crystal samples of ${\mathrm{LaMn}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}{\mathrm{O}}_{3}.$ The data reveal a spin-glass phase in l…