Materials Literature
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Attractive emulsions near the colloidal glass transition are investigated by rheometry and optical microscopy under shear. We find that (i) the apparent viscosity eta drops with increasing shear rate, then remains approximately constant in a range of shear rates, then continues to decay; (ii) the first normal stress d…
Recent results on achieving ferromagnetism in transition-metal-doped GaN, AlN and related materials are discussed. The field of semiconductor spintronics seeks to exploit the spin of charge carriers in new generations of transistors, lasers and integrated magnetic sensors. There is strong potential for new classes of…
In recent years, an increasing number of microcapsule systems have been realized and have found applications in various fields of research and technology. Amongst others, polyelectrolyte multilayer capsules (PMCs) offer a great variety of materials and superior control over the wall thicknesses. We present here a revi…
BACKGROUND: Doxorubicin exhibits high efficacy in malignant glioma cell cultures. Nonetheless, as a standard formulation, doxorubicin has not been used clinically, due to poor penetration of the blood-brain barrier. Furthermore, doxorubicin is known to induce tumor resistance genes. To address both of these issues, th…
The physics of liquids in porous media gives rise to many interesting phenomena, including imbibition where a viscous fluid displaces a less viscous one. Here we discuss the theoretical and experimental progress made in recent years in this field. The emphasis is on an interfacial description, akin to the focus of a s…
Novel silver nanowire thin films, which consist of interwoven bundles of single-crystalline silver nanowires about 30−40 nm in diameter, have been successfully synthesized on glass wall by mild chemical reduction in aqueous solutions of poly(methacrylic acid) at room temperature. Scanning electron microscopy (SEM), tr…
Zinc selenide nanoribbons and nanowires were obtained using laser ablation of ZnSe pressed powders. Their formation appeared to follow the vapor−solid and vapor−liquid−solid growth mechanisms, respectively. The product was characterized by means of scanning electron microscopy, transmission electron microscopy, micro-…
Analysis of the point-contact spectroscopy (PCS) data on the new dramatic high-T$_c$ superconductor MgB$_2$ reveals quite different behavior of two disconnected $σ$ and $π$ electronic bands, deriving from their anisotropy, different dimensionality, and electron-phonon interaction. PCS allows direct registration of bot…
We calculate the electron exchange coupling for a phosphorus donor pair in silicon perturbed by a J-gate potential and the boundary effects of the silicon host geometry. In addition to the electron-electron exchange interaction we also calculate the contact hyperfine interaction between the donor nucleus and electron…
Structural relaxations in electronically excited poly(para-phenylene) are studied using many-body perturbation theory and density-functional-theory methods. A sophisticated description of the electron-hole interaction is required to describe the energies of the excitonic states, but we show that the structural relaxat…
On the basis of spectral-expansion Green's function theory, we theoretically describe the topography, polarization, and spatial-coherence properties of the second-harmonic (SH) local fields at rough metal surfaces. The spatial distributions of the fundamental frequency and SH local fields are very different, with high…
Well-defined rodlike and fiberlike SBA-15 mesoporous silicas have been selectively synthesized from an aqueous reaction mixture consisting of a commercial sodium silicate solution, P123 triblock copolymer and HCl. The morphologies and physicochemical properties of the products were found to be greatly affected by the…
The solid solution Nb x Ti 1 - x O 2 +δ has been synthesized by a sol−gel method with 0.0 ≤ x ≤ 0.1. Structural and microstructural properties have been studied by XPS, XRD, Raman spectroscopy, and TEM as a function of the Nb/Ti atomic ratio and thermal treatment temperature (600−900 °C). XRD analyses showed that a pe…
We report here a novel approach to synthesize chiral PANI nanofibers in an aqueous solution. This new approach requires the following conditions: (1) Polymerization was carried out in concentrated camphor sulfonic acid solutions. (2) Aniline oligomers were used to accelerate the polymerization reaction. (3) Ammonium p…
The surface energies and electronic structure of (111), (110), and (100) surfaces of ${\mathrm{CeO}}_{2}$ have been studied using the first-principles projector augmented-wave method within the local density approximation (LDA) and generalized gradient approximation (GGA) and are compared with molecular dynamics (MD)…
Four 3-D coordination polymers of lanthanide with a tetra(amino acid) ligand, 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetrapropionic acid (H4L, 1), were synthesized. The structure of the Gd(III) complex was characterized. The fluorescence of the Eu(III) complex can be modulated by Ag+.
The implications of the entanglement concentration ( C e ) on the electrospinning process for a series of linear and branched poly(ethylene terephthalate- co -ethylene isophthalate) (PET- co -PEI) copolymers with weight-average molecular weights ( M w ) ranging from 11 700 to 106 000 g/mol and branching index values (…
Abstract A series of linear polyamides (P n MLM) derived from O ‐methyl‐protected L ‐malic acid and 1, n ‐alkanediamines with even n values ranging from 4 to 12 were prepared and fully characterized. L ‐Malic acid entered in the chain with a random orientation rendering essentially aregic polymers. P n MLM displayed o…
The practicality of using polysulfone as a host material for electro-optic polymer devices is demonstrated. For loadings of 15–25 weight %, r33 values of 53–55 pm/V were obtained at λ=1.06 μm. This corresponds to chromophore alignment efficiencies of up to 27%. Also, Mach–Zehnder devices demonstrated the implementatio…
Second-harmonic generation and thermal stability of hybrid photosensitive sol-gel films doped with a side-chain electro-optic chromophore have been studied. Nonlinear optic coefficient d33 has been derived for the cross-linked and noncross-linked sol-gel films. The d33 of the cross-linked hybrid sol-gel film shows hig…