Materials Literature
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Reduction factors (RF), that are needed when modeling vibronic systems by an effective Hamiltonian in an electronic basis, are calculated for the T_1u x h_g Jahn-Teller (JT) system. The results obtained will be useful when modeling the fullerene anion C_60-, which is believed to exhibit a T_1u x h_g JT effect in its g…
Two series of uniaxial tensile tests are performed on isotactic polypropylene with the strain rates ranging from 5 to 200 mm/min. In the first series, injection-molded specimens are used without thermal pre-treatment, whereas in the other series, the samples are annealed for 51 h at 160C prior to testing. A constituti…
Photoluminescence excitation spectroscopy and scanning-tunneling spectroscopy are used to study the electronic states in CdSe quantum rods that manifest a transition from a zero-dimensional to a one-dimensional quantum-confined structure. Both optical and tunneling spectra show that the level structure depends primari…
This work demonstrates multistage complementary NOR, OR, NAND, and AND logic gates and ring oscillators (frequency ∼220 Hz) with arrays of p- and n-type nanotube field effect transistors (FETs). The demonstration is made possible by progress in three aspects of nanotube synthesis and integration. First, patterned grow…
Carbon nanotubes have unique properties that make them a most promising system on which to base molecular electronics. We briefly review the electrical characteristics of carbon nanotubes, and then focus on carbon nanotube field-effect transistors (CNTFETs). Procedures by which hole-transport, electron-transport and a…
In this work, X-ray studies of the amorphous oxide films obtained by thermal evaporation of WO(3) powder in a vacuum and by anodic oxidation were carried out. X-ray diffraction patterns were obtained in the symmetric reflection geometry on a DRON-4 diffractometer (Mo K(alpha) radiation, LiF monochromator) in automatic…
Abstract Blends of maleated polypropylene with maleic anhydride (PP–MAH) and maleated styrene–butadiene–styrene triblock copolymer with maleic anhydride (SBS–MAH) were compatibilized with 4,4′‐diaminediphenylmethane, at various concentrations, as the coupling agent for the functionalized polymers. Their properties wer…
Structural proteomics aims to provide one or more representative three-dimensional (3D) structures for every structural domain family in nature. As part of an international effort in structural proteomics, the Northeast Structural Genomics Consortium has targeted clusters of strongly conserved eukaryotic protein famil…
Calculations of traditional wave function and DFT based reactivity descriptors are reported for the nanocluster [(RSn)12O14(OH)6]2+ (R = CH3) in order to get insight into the factors determining the exact nature of its interactions with anions or neutral nucleophiles (F−, Cl−, OH−, H2O, acetone, DMSO). Two levels of c…
A quantitative measurement method of the linear dielectric constant using cantilever-type scanning nonlinear dielectric microscopy (SNDM) is reported. Using this method, we succeed in quantitatively measuring the linear dielectric constant distribution of TiO 2 –Bi 2 Ti 4 O 11 ceramics with higher resolution than that…
Silver and silica nanoparticles stabilised by long chain alkanes have been prepared and characterised using 1H-NMR, transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Upon solvent evaporation, the alkane stabilised silica and silver nanoparticles self-assemble into close-packed two- and th…
Abstract Physically crosslinked hydrogels are formed upon mixing equal amounts of aqueous solutions of dextran grafted with L ‐lactic acid oligomers and dextran grafted with D ‐lactic acid oligomers. In this paper, the dex‐lactate hydrogels are analyzed by X‐ray diffraction to provide evidence that hydrogel formation…
The dynamics of atactic polypropylene has been explored with quasielastic neutron scattering (QENS) measurements in the temperature range 4−460 K and momentum transfer range q = 0.2−2.25 Å -1 . In parallel, molecular dynamics simulations of the same polymer have been conducted in the temperature range 260−600 K, using…
We present new time-resolved powder diffraction data measured in situ during the hydrothermal crystallisation of two families of crystalline inorganic materials. In the first study, we have used time-resolved energy-dispersive X-ray diffraction (EDXRD) to follow the formation of zeolitic zinc phosphates from amine pho…
A method for the processing of an individual nanotube, which is based on the thermally assisted field evaporation process, has been performed using a nanomanipulator installed in a scanning electron microscope. One nanotube is placed opposite another at a distance of about one micrometer and voltage is applied between…
A new nanocomposite was synthesized by reacting the layered double hydroxide Al 0.33 Mg 0.67 (OH) 2 (C 12 H 25 SO 4 ) 0.33 ·0.64H 2 O with poly(ethylene oxide). The composite was characterized with X-ray powder diffraction, thermal analysis (simultaneous thermogravimetric analysis/differential scanning calorimetry), F…
Micropatterning of anatase TiO2 thin films by site-selective immersion was realized using a self-assembled monolayer (SAM) which has a pattern of hydrophilic and hydrophobic surfaces. A solution containing a Ti precursor contacted the hydrophilic surface during the experiment and briefly came into contact with the hyd…
Abstract We studied the crosslinking of conventional nitrile rubber with metal peroxide at varying temperatures. Crosslink density, measured by swelling in the solvent until equilibrium, and the reaction rate increased with temperature, suggesting that crosslinking is a function of peroxide decomposition. At a specifi…
Self-assembly between the building blocks [M2(mu-dppm)2(MeCN)2]2+ (M = Cu or Ag; dppm = bis(diphenylphosphino)methane) and M'(aet)2 (aet = 2-aminoethanethiolate) afforded luminescent heterohepta-nuclear complexes [Cu4M'3(mu-dppm)3(mu 3-aet)4(mu-aet)2]4+ (M' = Ni 1; Pd 2) or heterotrinuclear complexes [Ag2M'(mu-dppm)2(…
Cd-rich CdSe nanocrystals below a critical size, under illumination, catalyze CO2 fixation, but bulk CdSe surfaces do not. We report first-principles calculations in which we determine the roles of faceting, deviations from stoichiometry, photoexcitation, and electron confinement, and the specific physics of the nanos…