Materials Literature
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Three novel hydrated rare earth polyborates, Ln[B 8 O 11 (OH) 5 ] (Ln = La−Nd) ( 1 ), Ln[B 9 O 13 (OH) 4 ]·H 2 O (Ln = Pr − Eu) ( 2 ), and Ce[B 5 O 8 (OH)]NO 3 ·3H 2 O ( 3 ) have been synthesized by using boric acid as a flux at 240 °C, starting from rare earth oxides or nitrates and an excess of boric acid. All these…
Starting from an amorphous C film, single-walled carbon nanotubes were obtained in situ in a high-resolution electron microscope by the combined effect of irradiation and axial strain. Ductile nanotubes developed either a junction or a linear chain of C atoms before failure. These facts have been put in direct evidenc…
In this paper we study the wedge disclination within the elastoplastic defect theory. Using the stress function method we found exact analytical solutions for all characteristic fields of a straight wedge disclination in a cylinder. The elastic stress, elastic strain, elastic bend-twist, displacement and rotation have…
Neutron elastic diffuse scattering experiments performed on $\mathrm{Pb}({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}$ (PZN) and on its solid solution with ${\mathrm{PbTiO}}_{3}(\mathrm{PT}),$ known as PZN-$x\mathrm{PT},$ with $x=4.5$ and 9 % around many reflections show that diffuse scattering is observed…
We have studied the effective response of composites of spherical particles each having a dielectric profile which varies along the radius of the particles. We developed a first-principles approach to compute the dipole moment of the individual spherical particle and hence the effective dielectric response of a dilute…
We combine infrared reflectivity and EXAFS (Extended X-ray Absorption Fine Structure) techniques to study the solid solution La0.67Ca0.33MnO3 prepared by different methods yielding samples with different insulator-metal transition temperatures (TIM). While the small polaron analysis of the optical conductivity provide…
Angle-resolved photoemission spectroscopy and Auger electron spectroscopy have been applied to study the intercalation process of silver underneath a monolayer of graphite (MG) on Ni(111). The room-temperature deposition of silver on top of MG/Ni(111) system leads to the islands-like growth of Ag on top of the MG. Ann…
We describe the low temperature behaviour of the magnetic susceptibility of Cd2Re2O7 in terms of a Landau theory of structural phase transitions. We calculate the zero temperature Pauli susceptibility using a tight-binding approach to reveal the mechanism of coupling between the structural order parameter and itineran…
Does a signal protein imbedded in a polyelectrolyte layer keep its activity? The study reported here demonstrates that cells can indeed interact with proteins incorporated in poly( L ‐lysine/glutamic acid) multilayer films. In contrast, poly( D ‐lysine) acts as a barrier to cell communication. For the case of monocyti…
The surface characteristics of intravenously administered particulate drug carriers decisively influence the protein adsorption that is regarded as a key factor for the in vivo fate of the carriers. Latex nanoparticles were synthesized to study the influence of different basic and acidic functional groups on particula…
Nanocomposites consisting of PbS nanocrystals in a conjugated polymer matrix were fabricated. We report results of photo- and electroluminescence across the range of 1000 to 1600 nm with tunability obtained via the quantum-size effect. The intensity of electroluminescence reached values corresponding to an internal qu…
We investigate the strongly temperature-dependent radiative lifetime of electron–hole excitations in colloidal CdSe nanocrystal quantum dots over nearly three orders of magnitude in temperature (300 K to 380 mK). These studies reveal an intrinsic, radiative upper limit of ∼1 μs for the storage of excitons below 2 K. A…
We report the direct observation by x-ray diffraction of a photoinduced paraelectric-to-ferroelectric structural phase transition using monochromatic 100-picosecond synchrotron pulses. It occurs in tetrathiafulvalene-p-chloranil, a charge-transfer molecular material in which electronic and structural changes are stron…
Triangular nanoplates of silver are prepared by irradiating aqueous dispersions of spherical silver colloids with visible light in the presence of both poly(vinyl pyrrolidone) and sodium citrate. These silver nanoplates serve as sacrificial templates to generate triangular rings of gold (see transmission electron micr…
To prepare immunomicelles, new targeted carriers for poorly soluble pharmaceuticals, a procedure has been developed to chemically attach mAbs to reactive groups incorporated into the corona of polymeric micelles made of polyethylene glycol-phosphatidylethanolamine conjugates. Micelle-attached antibodies retained their…
Important advances in multi-scale computer simulation techniques for computational materials science have been made in the last decade as scientists and engineers strive to imbue continuum-based models with more-realistic details at quantum and atomistic scales. One major class of multi-scale models directly couples a…
Tubular nanostructures are suggested to have a wide range of applications in nanotechnology. We report our observation of the self-assembly of a very short peptide, the Alzheimer's beta-amyloid diphenylalanine structural motif, into discrete and stiff nanotubes. Reduction of ionic silver within the nanotubes, followed…
The probabilistic formula derived via the rigorous method of the joint probability distribution function to estimate protein phases in the single-wavelength anomalous diffraction (SAD) case [Giacovazzo & Siliqi (2001). Acta Cryst. A57, 40-46] has been revised. A simple but equally effective formula is provided, allowi…
Abstract Inelastic X‐ray scattering (IXS) measurements on Al have been analyzed in conjunction with ab initio , time‐dependent density functional theory (TDDFT) calculations of the electron–hole excitation spectrum. The dynamical structure factor evaluated with use of the many‐body kernel f xc obtained within the adia…
Abstract In the present work, we study the thermal behavior of Polymer (Polystyrene) dispersed (4‐cyano‐4′‐pentylbiphenyl) 5CB liquid crystal film composite. A photopyroelectric device was used to study thermal conductivity at homeotropic and planar aligned of 4‐cyano‐4′‐pentylbiphenyl (5CB) liquid crystal. Thermal co…