Materials Literature
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The spectroscopic behavior of rhodamine 6G (R6G) dye intercalated in layered hexaniobate K4Nb6O17 was investigated. R6G cations were intercalated into the niobate through displacement of preintercalated alkylammonium ions. Powder X-ray diffraction and elemental analysis indicated that the dye molecules were densely ac…
Abstract Electrically conductive resins can be made by adding electrically conductive fillers to typically insulating polymers. Resins with an electrical resistivity of approximately 10 0 ohm‐cm or less can be used for electromagnetic and radio frequency interference shielding applications. This research focused on pe…
Using submonolayer Be deposition onto the Si(111) 7 × 7 surface under ultrahigh vacuum conditions, highly ordered honeycomb-like nanostructure arrays have been obtained. Scanning tunneling microscopy analysis of the nanostructure building blocks has revealed that they have composition, size, and properties similar to…
The phenomenon of particle-stimulated nucleation (PSN) during recrystallization of commercial aluminium alloys has been widely investigated both from a ;scientific viewpoint and from the industrial perspective. The technological impact of this phenomenon is the finding that, depending upon the thermomechanical process…
The alloy Fe35Pt35P30, whose composition is close to a ternary eutectic, was rapidly solidified by melt spinning and the ribbon exhibited a high coercivity, exceeding 20kOe after annealing. The alloy was mainly composed of L10 ordered FePt and PtP2 with an average grain size of about 50nm. In the as-cast state, the al…
Nonlocal gradient corrected density functional theory was used to determine the optimal positions of the protons and their relative affinity in the secondary structure of phosphotungstic acid. First, a body centered cubic structure associated with the hexahydrate was incorporated into the model. The desorption energie…
Large diameter single wall carbon nanotubes exist with both round right cylinder and barbell-like flattened cross sections. Using an adaptive intermolecular reactive bond order potential, we examine the characteristics of both configurations by using molecular dynamics simulations. We then continue to examine the dyna…
Abstract A new sodium molybdate, Na 6 Mo 11 O 36 , has been synthesized, and its crystal structure was determined by single crystal X‐ray diffraction (space group P‐1 ; a = 7.2722(6)Å, b = 22.376(1)Å, c = 9.6686(8)Å, α = 89.98(1)°, β = 112.12(1)°, γ = 90.29(1)°; Z = 2). The compound can be considered as a new structur…
We demonstrate theoretically that modification of the acoustic phonon spectrum in semiconductor heterostructures with large acoustic impedance mismatch between the core and cladding layers may lead to strong phonon depletion in the core layer. The latter is achieved if the heterostructure parameters are properly tuned…
Abstract Recent developments in polymer nanocomposites have led to improvements in conventional short‐term, but the long‐term mechanical properties have received little attention. The objective of the present study was to characterize the effect of nanoparticles on the fatigue crack initiation and propagation mechanis…
BACKGROUND: Liposomal encapsulation of doxorubicin has been shown to reduce nonspecific delivery of this agent to normal tissue and to increase specific delivery to malignant cells. On the basis of doxorubicin's demonstrated clinical efficacy against hormone-refractory prostate carcinoma (HRPCA), the authors conducted…
The acoustic phonon transport through an asymmetric y-branch semiconductor quantum structure is investigated by use of the scattering-matrix method. It is found that the quantum structure exhibits mode-splitting behavior, resonant transmission, and the noninteger quantized thermal conductance at very low temperatures.…
A new zirconium-containing polyoxotungstate [{W 5 O 18 Zr(μ-OH)} 2 ] 6- 2 was prepared by alkalinization of a solution of the monomeric form [W 5 O 18 Zr(H 2 O)] 2- 1 . The crystal structure of ( n Bu 4 N) 6 [{W 5 O 18 Zr(μ-OH)} 2 ]·2H 2 O (monoclinic; space group C 2/ c; a = 26.086, b = 17.018, c = 32.891 Å; β = 112.…
The spreading of one- and two-component polymer nanodroplets is studied using molecular dynamics simulation in a cylindrical geometry. The droplets consist of polymer chains of length 10, 40, and 100 monomers per chain described by the bead-spring model spreading on a flat surface with a surface-coupled Langevin therm…
We develop a phenomenological model describing the structural and topological effects of the disorder in hydrogenated amorphous carbons (a-C:H), through the analysis of the Raman G-peak width and the optical absorption spectra, providing information on the densities of electronic π ad π* states (πDOS). We show that th…
Zinc and palladium tetracyclic aromatic complexes lying structurally between tetraazaporphyrin (TAP) and phthalocyanine (Pc), that is, monobenzo-, adjacently dibenzo-, oppositely dibenzo-, and tribenzo-fused TAPs, have been prepared, and their electronic structures investigated by electronic absorption, magnetic circu…
Controlled grafting of well-defined epoxide polymer brushes on the hydrogen-terminated Si(100) substrates (Si-H substrates) was carried out via the surface-initiated atom-transfer radical polymerization (ATRP) at room temperature. Thus, glycidyl methacrylate (GMA) polymer brushes were prepared by ATRP from the alpha-b…
Gold catalysts supported on γ-Al 2 O 3 (Au/γ-Al 2 O 3 ) were prepared by deposition-precipitation of aqueous HAuCl 4 and, alternatively, by deposition of Au(CH 3 ) 2 (acac) from pentane solution. The samples were characterized by in situ XANES and temperature-programmed reduction and by their performance as CO oxidati…
Abstract Recent advances in the chemistry of dimeric silsesquioxanes and metallasilsesquioxanes are reviewed. The number of metal‐free silsesquioxane dimers is still quite limited, although some promising synthetic routes have already been developed. In contrast, metallasilsesquioxanes containing two silsesquioxane li…
The delafossite phase of CuAlO2 has been prepared by ion exchange reaction at 475°C. The samples were characterized by x-ray diffraction, transmission electron microscopy, electron diffraction, transient and spectral photovoltage (PV), and diffuse reflectance spectroscopy. The produced CuAlO2 crystallites are p-type a…