Materials Literature
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Unimolecular decay rates and monomer-dimer branching ratios of gold clusters ${{\mathrm{Au}}_{N}}^{+}$ $(N=7--27)$ have been measured as a function of excitation energy in photodissociation experiments on size-selected clusters stored in a Penning trap. Part of the data set has previously been used to extract model-fr…
Tubular balls: Self-assembly of an Au nanocluster with bionanotubes of bacteriophage T4 gene product 5 (gp5) trimers has been demonstrated (see picture). The triad of His6 fragments at the C terminus of (gp5–His6)3 contributed to the construction of an ordered tetrapod-like bionanotube assembly and the formation of Au…
Abstract A new conducting copolymer, polyacrylonitrile‐ graft ‐polyaniline (PAN‐ g ‐PANi), has been prepared by chemical and electrochemical methods from a precursor polymer. Poly[acrylonitrile‐ co ‐(acrylimine phenylenediamine)] (PAN‐ co ‐PAIPD) was synthesized chemically by reacting PAN with sodium 1,4‐phenylenediam…
We test classical nucleation theory (CNT) in the case of simulations of deeply supercooled, high density liquid silica, as modeled by the van Beest-Kramer-van Santen potential. We find that at density rho=4.38 gcm(3), spontaneous nucleation of crystalline stishovite occurs in conventional molecular dynamics simulation…
Phase‐pure lanthanum stannate (La 2 Sn 2 O 7 ) nanoparticles with a pyrochlore structure were produced by a simple coprecipitation method for the first time. The optical properties of La 2 Sn 2 O 7 synthesized by different conditions were investigated. They had different photoluminescence intensities around 400 nm at…
In this paper stable, low-resistance contacts on porous silicon have been realized by electroless nickel deposition from a very weakly alkaline solution followed by copper thickening. The porous silicon layer after nickel deposition has been analysed by x-ray diffraction, which shows that a porous silicon nickel struc…
The Wang-Landau Monte Carlo approach is applied to the coil-globule and melting transitions of off-lattice flexible homopolymers. The solid-liquid melting point and coil-globule transition temperatures are identified by their respective peaks in the heat capacity as a function of temperature. The melting and theta poi…
Silicon carbide fiber‐reinforced silicon carbide matrix composites (SiC f /SiC) have been produced using microwave heated chemical vapor infiltration. Preferential densification of the composite from the inside out was clearly observed. Although an average relative density of only 55% was achieved in 24 h, representat…
The results of a detailed study of Li(+) neutralization in scattering on Ag and Au clusters and thin films supported on TiO(2) are presented. A very efficient neutralization is observed on small clusters with a decrease for the smallest clusters. These results closely follow the size-effects observed in the reactivity…
Abstract The VAPEX process has attracted much attention as a potential recovery process for heavy oil, yet VAPEX mechanisms are still poorly quantified. The laboratory work described here was undertaken to explain the roles of different mechanisms in VAPEX, and to test the relative magnitudes of the mechanisms by mean…
We have synthesized ditopic ligands L(1), L(2), and L(3) that contain two DO3A(3-) metal-chelating units with a xylene core as a noncoordinating linker (DO3A(3-) = 1,4,7,10-tetraazacyclododecane-1,4,7-triacetate; L(1) = 1,4-bis{[4,7,10-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecane-1-yl]methyl}benzene; L(2) = 1,3-…
Irradiation of nanotube structures with electron and ion beams has been used to produce functionalized nanotubes and fundamentally new structures, including junctions. Here, we build on previous studies to investigate the low-energy electron and ion (Ar and $\mathrm{C}{\mathrm{F}}_{3}$) beam irradiation of triple-wall…
Mesoporous silica modified with titania was prepared using the sol−gel process. The structure of these composites was studied using infrared and UV−visible spectroscopies, thermogravimetry, nitrogen sorption measurements, and scanning and transmission electronic microscopies. In light of these results, a model of form…
A newly synthesized, selenium-bridged copper cluster [Cu 4 {Se 2 P(O i Pr) 2 } 4 ] was employed in a single-source chemical vapor deposition (SSCVD) process to produce single-crystalline nonstoichiometric Cu 2 - x Se nanowires for the first time. This is the first discrete, chalcogen-bridged copper cluster being used…
Electronic structure of ${\mathrm{Co}}_{x}{\mathrm{Zn}}_{1\ensuremath{-}x}\mathrm{O}$ magnetic semiconductor was investigated by means of density functional calculations using local density approximation (LDA) and $\mathrm{LDA}+\mathrm{U}$ schemes. The Hubbard ${\mathrm{U}}_{\mathrm{Co}}$ implemented in the calculatio…
The relation between the fragility of glass-forming systems, a parameter which describes many of their key physical characteristics, and atomic scale structure is investigated by using neutron diffraction to measure the topological and chemical ordering for germania, or GeO(2), which is an archetypal strong glass form…
It is demonstrated that in a two-band two-dimensional system resonance state is manifested close to the energy of the Dirac point in the electron spectrum for a sufficiently large impurity perturbation. With increasing impurity concentration, the electron spectrum undergoes a rearrangement, which is characterized by t…
The adsorption of molecular hydrogen in the Prussian blue analogue Cu 3 [Co(CN) 6 ] 2 was investigated using high-resolution neutron powder diffraction and neutron vibrational spectroscopy. Rietveld structural refinement of the neutron data for hydrogen loadings of 1, 2, and ∼2.3 H 2 /Cu showed that the hydrogen was a…
ZnO has become the focus of photonics and optoelectronic research. We prepared pure Mn(II) doped ZnO nanowires with a controlled reduction reaction by carbon in an asymmetrical tube. Careful time-resolved photoluminescence experimental study indicates three types of lasing mechanisms: exciton-exciton interaction, bipo…
The photoinduced magnetism in manganese-tetracyanoethylene (Mn-TCNE) molecule-based magnets is ascribed to charge-transfer excitations from manganese to TCNE. Charge-transfer energies are calculated using Density Functional Theory; photoinduced magnetization is described using a model Hamiltonian based on a double-exc…