Diazonium‐Based Functionalization of Carbon Nanotubes: XPS and GC—MS Analysis and Mechanistic Implications.
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Effects of adsorption of alcohol and water on the electrical transport of carbon nanotube bundles
In situ studies on the effects of physisorption of various alcohol molecules (C n H 2 n +1 OH; n = 1–4) on the transport properties of thin films of bundled single-walled carbon nanotubes reveal large increases in the thermoelectric power (TEP) S ( ) and four-probe resistance R ( ) at 40 °C. Interestingly, exposure to…
Molecular Structure of Azopolymers and Photoinduced 3D Orientational Order. 1. Azobenzene Polyesters
The combination of transmission null ellipsometry (TNE) and attenuated total reflection (ATR) methods supported by absorption measurements is shown to be an effective tool to study spontaneous and photoinduced 3D order in azopolymers. We investigated a series of azobenzene containing side-chain polyesters differing by…
Domain structure of epitaxial CaHfO3 gate insulator films on SrTiO3
Thin CaHfO3 films were grown on (100) and (110)-oriented SrTiO3 surfaces with the aim of obtaining an insulator film for epitaxial oxide device design. We show that films grown on the (100) surface of SrTiO3 have a multidomain structure, which increases film roughness and decreases the maximum breakdown field of the i…
Nanostructuring the Er–Yb distribution to improve the photoluminescence response of thin films
Thin films of amorphous aluminum oxide (a-Al2O3) codoped with Er3+ and Yb3+ ions have been in-depth nanostructured by distributing the rate earth (RE) ions in layers separated in the 0–3 nm range. The Yb to Er concentration ratio is varied from 0 to 3.6. The photoluminescence (PL) response at 1.53 μm exhibits an incre…
Giant magnetostriction on Fe85Ga15 stacked ribbon samples
Large magnetostrictions of −1300 and +1100 ppm related in the different directions have been obtained in our stacked Fe85Ga15 ribbon samples. In the case of non-180° domain magnetization in the high anisotropic samples, the magnetostrictions are mainly attributed to the existence of Ga clusters which preferentially or…
Protein crystallography with spallation neutrons: collecting and processing wavelength-resolved Laue protein data
The protein crystallography station at Los Alamos Neutron Science Center is the first to be built at a spallation neutron source. Time-of-flight methods in combination with a large electronic position-sensitive and time-sensitive detector are used in order to collect wavelength-resolved Laue diffraction data. The wave…
Electroactivity of Electrochemically Synthesized Poly(Aniline Boronic Acid) as a Function of pH: Role of Self-Doping
The influence of pH on the electrochemical behavior of electropolymerized, self-doped poly(aniline boronic acid) thin films in the presence of d -fructose has been investigated with voltammetry and potentiometry in phosphate-buffered saline solution. It was found that the complexation of boronic acid with d -fructose…
Structure- and spin-dependent excitation energies and lifetimes of Si and Ge nanocrystals fromab initiocalculations
We calculate spin-dependent excitation energies of Ge and Si nanocrystals by means of a $\ensuremath{\Delta}$-self-consistent-field method that considers the excitation of an electron-hole pair and thus includes the electron-hole Coulomb interaction. The method is based on local-density and local-spin-density calculat…
Optical spectroscopy of Pr3+in M+Bi(XO4)2, M+= Li or Na and X = W or Mo, locally disordered single crystals
NaBi(WO 4 ) 2 (NBW), NaBi(MoO 4 ) 2 (NBMo) and LiBi(MoO 4 ) 2 (LBMo) single crystals grown by the Czochralski technique have been doped up to a praseodymium concentration of in the crystal. 10 K polarized optical absorption and photoluminescence measurements have been used to determine the energy position of 32, 39 an…
Dielectric anomalies and phase transition in glycinium phosphite crystal under the influence of a transverse electric field
The dielectric properties of glycinium phosphite (GPI) crystals as a function of temperature and electric field magnitude are investigated. The electric field E is applied perpendicularly to the ferroelectric b -axis in the direction of hydrogen-bonded phosphite chains in the crystal (the c -axis). The shift of the pa…
Metallomesogens Modified by Hydrogen Bonds or by Bridging GroupsNew Re-entrant Isotropic Phase
Two series of tetradental cis -enaminoketone Ni(II) complexes with triangular mesogenic core stiffened by external ethylene or methylene units have been synthesized. One of the obtained compounds reveals a unique phase sequence: Iso−Col h −Iso re . The enormously stable Col h phase has been detected for metallomesogen…
Ab initioprotein phasing: the Patterson deconvolution method inSIR2002
An automated Patterson deconvolution technique, based on the minimum superposition function, has been implemented into the SIR2002 package, a program for the ab initio determination of small and large molecules. The procedure, combined with the direct-space phase refinement routines present in the SIR2002 program, has…
Electronic structure studies ofV6O13by soft x-ray emission spectroscopy: Band-like and excitonic vanadium states
Resonant soft x-ray emission (SXE) spectra of the mixed valence vanadium oxide ${\mathrm{V}}_{6}{\mathrm{O}}_{13}$ have been recorded for a series of excitation energies across the V $L$-absorption band. Resonant excitation allows one to distinguish between charge neutral low-energy excitations and continuum-excited,…
Parallel and Perpendicular Orientations Observed in Shear Aligned SCA Liquid Crystal of Main-Chain Polyester
Shear alignment behavior was examined for smectic CA (S CA ) phase of main-chain BB-5(3-Me) polyester using a cone-and-plate fixture. In the smectic temperature region from 100 to 140 °C, two distinct orientations have been identified by wide-angle X-ray diffraction. At temperatures lower than 130 °C, the smectic laye…
Photoemission and x-ray absorption spectroscopy study of electron-doped colossal magnetoresistive manganiteLa0.7Ce0.3MnO3films
The electronic structure of ${\mathrm{La}}_{0.7}{\mathrm{Ce}}_{0.3}{\mathrm{MnO}}_{3}$ (LCeMO) thin films has been investigated using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). The Ce $3d$ core-level PES and XAS spectra of LCeMO are very similar to those of ${\mathrm{CeO}}_{2},$ indicati…
Density Functional Theory Investigations of the Direct Oxidation of Methane on an Fe-Exchanged Zeolite
The reactions of methane with [FeO 2 ] + and [OFeO)] + cations exchanged into ZSM-5 have been investigated using density functional theory. Experimental evidence for the latter cation has recently been reported on the basis of EXAFS experiments performed on Fe−ZSM-5 with Fe/Al = 0.17−0.80. Of the two iron-containing s…
Block Copolymer Domain Reorientation in an Electric Field: An in-Situ Small-Angle X-ray Scattering Study
Using in-situ small-angle X-ray scattering, the electric field induced orientation of symmetric block copolymers of polystyrene and polyisoprene was investigated. Alignment of the lamellar microdomains parallel to the electric field was achieved within minutes to a high degree of orientation. Analysis of the scatterin…
Electro-Optics of Bipolar Nematic Liquid Crystal Droplets
We directly visualize the response and relaxation dynamics of bipolar nematic liquid crystal droplets to an applied electric field E. Despite strong planar anchoring, there is no critical field for switching. Instead, upon application of E, the surface region first reorients, followed by movement of the disclinations…
Electrochemical gating of individual single-wall carbon nanotubes observed by electron transport measurements and resonant Raman spectroscopy
Metal electrodes patterned lithographically on top of individual single-wall carbon nanotubes are used to gate the nanotubes with respect to a reference electrode in an electrolyte drop. The gating is found to have a dramatic effect on both the Raman spectra and electron transport of the nanotubes. Current through met…