Materials Literature
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Individual multiwalled carbon nanotubes were controllably wetted by polyethylene glycol, glycerol, and water. A Wilhelmy force balance approach was used to calculate contact angles at the nanotube-polyethylene glycol and nanotube-glycerol interfaces, allowing examination of the contact angle dependence on the nanotube…
Abstract We investigated correlation between concentration of deep level defects at dislocations, detected by deep level transient spectroscopy (DLTS) and the efficiency of dislocation related luminescence in Si samples with dislocation density of about (3–5) × 10 8 cm –2 . We show that significant reduction of concen…
Self-phase modulated optical fringe patterns are used to study the nonlinear optical response of nanocrystalline silicon produced by laser-induced etching. Intensity-dependent changes in the refractive index are calculated for various sizes of nanocrystallites. Raman spectroscopy is used to determine the sizes of nano…
The electronic structure of $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_{3}$ film grown on $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ substrate is investigated in situ by ultraviolet and x-ray photoemission spectroscopy (XPS). The valence band spectrum shows the Ru $4d$ weight is transferred from the coherent part to the incohe…
The published data on the structures and properties of porphyrins with distorted aromatic macrocycles are generalised and analysed. Data on the crystal structures, spectra and kinetics of formation and dissociation of their coordination derivatives are summarised. It is demonstrated that the distortion of the planar s…
A detailed calorimetric study of photostructural changes in glasses of the $\mathrm{Ge}\ensuremath{-}\mathrm{Se}$ system is presented. The photomodified structure corresponds to a distinct entropy state intermediate between a fully thermally relaxed glass and a fresh glass. This intermediate photoinduced structure app…
Illumination of air-free aqueous solutions containing sulfonated poly(ether ether ketone) and poly(vinyl alcohol) with 350 nm light results in benzophenone ketyl radicals of the polyketone. The polymer radicals form with a quantum yield 0.02 and decay with a second-order rate constant 6 orders of magnitude lower than…
We study the effects of quantum fluctuations and the excitation spectrum for the antiferromagnetic Heisenberg model on a two-dimensional quasicrystal, by numerically solving linear spin-wave theory on finite approximants of the octagonal tiling. Previous quantum Monte Carlo results for the distribution of local stagge…
This paper concerns numerical approximations for the Cahn-Hilliard equation u t + (u -1 f (u)) = 0 and its sharp interface limit as 0, known as the Hele-Shaw problem. The primary goal of this paper is to establish the convergence of the solution of the fully discrete mixed finite element scheme proposed in This is acc…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAnionic Ring-Opening Polymerization of Methyl 4,6-O-Benzylidene-2,3-O- carbonyl-α-d-glucopyranoside: A First Example of Anionic Ring-Opening Polymerization of Five-Membered Cyclic Carbonate without Elimination of CO2Osamu Haba, Haru…
The thermal decomposition of hydroxyl-terminated generation-4 polyamidoamine dendrimer (G4OH) films deposited on Au surfaces has been compared with decomposition of the same dendrimer encapsulating an approximately 40-atom Pt particle (Pt-G4OH). Infrared absorption reflection spectroscopy studies showed that, when the…
Surface-enhanced Raman scattering (SERS) of p-aminothiophenol (PATP) molecules adsorbed onto assemblies of Au(core)/Cu(shell) nanoparticles is reported. We compare it with the SERS spectrum of PATP adsorbed onto gold nanoparticles: both the absolute and relative scattered intensities of various bands in the two spectr…
Rheological behavior of waterborne polyurethane dispersions was investigated with small-amplitude oscillatory shear flow experiments over wide ranges of concentration, degree of neutralization, chain extension, and temperatures to accelerate efforts to understand their film formation characteristics. The rheological p…
Dispersible carbon nanotube/gold nanohybrids have been synthesized (see TEM image). The dispersed nanohybrids (either formed from single-walled or multi-walled carbon nanotubes and thiol-protected gold nanoparticles) give rise to strong electronic coupling, which affects their important physicochemical properties.
Creep damage by void nucleation and growth limits the lifetime of components subjected to loading at high temperatures. We report a combined tomography and diffraction experiment using high-energy synchrotron radiation that permitted us to follow in situ void growth and microstructure development in bulk samples. The…
We study the electronic and magnetic properties of single-wall carbon nanotubes filled with Fe nanowires through local-spin-density-functional calculations. We find that the magnetic moments of Fe-filled carbon nanotubes for the ferromagnetic state are greatly enhanced due to the reduced coordination number of the Fe…
We have designed and synthesized a new Cu2Gd heterotrinuclear complex, [LCu2Gd(OAc)3] (1), where H4L is a bis(salen)-type tetraoxime ligand useful in the synthesis of discrete (3d)2(4f) complexes. Complex 1 crystallizes in the triclinic system, space group P1, with unit cell parameters a = 12.442(4) A, b = 13.397(3) A…
The review concerns the state-of-the-art in the field of investigations of the shape memory effect in various polymeric materials, namely, homopolymers, copolymers, polymer blends, filled polymer composites and polymer gels. New theoretical approaches to the description and practical applications of the shape memory e…
Polarization-independent phase-only modulation of a polymer-dispersed liquid crystal (PDLC) is demonstrated. In the low voltage region, PDLC is translucent because of light scattering. Once the voltage exceeds a saturation level, PDLC is highly transparent and exhibits phase-only modulation capability. Although the re…
ZnO can be regarded as one of the most important metal oxide semiconductors for future applications. Similar to silicon in microelectronics, it is not only important to obtain nanoscale building blocks of ZnO, but also extraordinary purity has to be ensured. A new gas-phase approach to obtain size-selected, nanocrysta…