Materials Literature
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The magnetic field dependence of the capacitance of Pd-AlOx-Al thin-film structures has been measured. The observed quadratic dependence of capacitance on magnetic field is consistent with a theoretical model that includes the effect of a spin-dependent electrochemical potential on electron screening in the paramagnet…
Hydrophobicity and sliding behavior of water droplets were investigated on various hydrophobic pillarlike and groove structures prepared on a silicon wafer by dicing and subsequently coating with fluoroalkylsilane. The dominant hydrophobicity mode was changed from Wenzel's mode to Cassie's mode at a smaller roughness…
The reductive coupling reactions in electrochemical polymerization of poly( p -phenylene vinylene) (PPV) have been studied by in situ UV−vis spectroscopy using lithographic galvanic microstructured metal foils (LIGA structure) as the working electrode, in situ UV−vis−ESR spectroscopy, and by the rotating ring−disk ele…
The gap in semiconductor nanocrystallites has been extensively studied both theoretically and experimentally over the last two decades. We have compared a recent ‘state-of-the-art’ theoretical calculation with a recent ‘state-of-the-art’ experimental observation of the gap in Si nanocrystallite. We find that the two a…
A series of antimony-doped Ba(8)Ga(16)Ge(30) clathrates was grown as large crystals from gallium flux. These compounds form in the cubic space group Pm(-)3n, with the unit cell parameter varying from 10.784(5) to 10.9008(6) A as the amount of GaSb substituting for germanium atoms in the framework is increased. It was…
The monodisperse oligoamides 1, 2, 3, and 4 have been tested as organic gelators. It was found that gelation occurs only above a critical degree of oligomerization of 2, that is, for the trimer 3 and the tetramer 4, and in aromatic solvents. Thermotropic and rheological properties of the trimer and the tetramer gels a…
The introduction of the CN group onto a diamond surface was attempted using diacyl peroxides with CN group-containing compounds. When acetonitrile was used as solvent for the radical reaction process, the CN group was introduced onto the diamond surface, however when benzonitrile was used no CN group was introduced. T…
The first application of variable-temperature 27 Al MAS NMR spectroscopy to the satellite transitions in the characterization of a structural phase transition is presented by an investigation of Friedels salt (Ca 2 Al(OH) 6 Cl·2H 2 O) over the temperature range from −121 to 109 °C. Accurate values for the 27 Al quadru…
We present a theoretical framework for the viscosity of bimodal and polydisperse colloidal suspensions. For colloidal dispersions both interparticle forces between pairs of particles and many-particle effects such as depletion forces can have a significant effect on rheology. As hydrodynamic interactions are also impo…
A 3 wt % Mo zeolite-supported oxidic precursor prepared from ammonium heptamolybdate by incipient wetness impregnation was studied using Raman and 27 Al NMR spectroscopies, at the various steps of its preparation. The formation of an Anderson type aluminomolybdate anion, which was preserved during drying, was observed…
Two new compounds containing the title diphosphono-polyoxometalate anion and diprotonated ethylenediamine (enH(2)) or piperazine (ppzH(2)) countercations have been hydrothermally synthesized and structurally characterized ((enH(2))(4)[Mo(7)O(16)(O(3)PCH(2)PO(3))(3)].7H(2)O, triclinic, P(-)1, Z = 2, a = 10.3455(7) A, b…
The preparation of first-row transition-metal complexes of texaphyrin, a porphyrin-like, monoanionic penta-aza macrocyclic ligand, is reported. Specifically, the synthesis of organic-soluble Mn(II) (1), Co(II) (2), Ni(II) (3), Zn(II) (4), and Fe(III) (5) texaphyrin derivatives and their water-soluble counterparts (6-1…
The electron-transfer (ET) dynamics of a series of unusually rigid pi-stacked porphyrin-quinone (P-Q) systems, in which sub-van der Waals interplanar distances separate juxtaposed porphyryl, aromatic bridge, and quinonyl components of these assemblies, are reported. The photoinduced charge separation (CS) and thermal…
The sensitive detection and characterization of carbohydrates by means of a strategy based on surface-enhanced Raman spectroscopy is demonstrated. Spectra are obtained after injecting a small amount of saccharide solution onto a roughened silver substrate, with subsequent deposition of silver colloid. The sensitivity…
The adsorption behavior of 4-biphenylisocyanide (BPNC) has been studied by means of surface-enhanced Raman scattering (SERS). BPNC has been found to adsorb on silver and gold via the carbon lone pair electrons assuming a standing geometry with respect to the surfaces. The presence of the ν(CH) band in the SERS spectra…
An unusual composite hybrid material [Co4(phen)8(H2O)2(HPO3)2](H3O)3[PMoVI8VIV4O40(VIVO)2] 1 (phen = 1,10-phenanthroline) has been hydrothermally synthesized from a mixture of NH4VO3, Na2MoO4·2H2O, CoCl2·6H2O, phen, H3PO3 and water. It was characterized by elemental analysis, IR, UV-vis, XPS, EPR, TG and single crysta…
A sterically hindered biphenol 2,2‘-(2-methoxybenzylidene)bis(4-methyl-6- tert -butylphenol) (MEBBP-H 2 ) ( 1 ) has been prepared by the reaction of o -anisaldehyde with 2- tert -butyl-4-methylphenol in the presence of a catalytic amount of benzenesulfonic acid. Further reaction of compound 1 with a stoichiometric amo…
Standard enthalpies of formation, ionization potentials, electron affinities, and band gaps of finite-length [5,5] armchair and [9,0] zigzag single-walled carbon nanotubes (SWNTs) capped with C(30) hemispheres obtained by halving the C(60) fullerene have been computed at the B3LYP/6-311G* level of theory. Properties o…
We present the result of a systematic study of the tribological properties of industrial Polytetrafluorethylene (PTFE)-based coatings carried out with an atomic force microscope. A new characterization protocol allowed the reliable and quantitative assessment of the friction coefficient and adhesion forces at the sub-…
We present a new method for constant-pressure molecular dynamics simulation which is parameter free. This method is especially appropriate for finite systems in which a periodic boundary condition does not apply. Simulations on carbon nanotubes and Ni nanoparticles clearly demonstrate the validity of the method, from…