Materials Literature
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PhzD from Pseudomonas aeruginosa is an isochorismatase involved in phenazine biosynthesis. Phenazines are antimicrobial compounds that provide Pseudomonas with a competitive advantage in certain environments and may be partly responsible for the persistence of Pseudomonas infections. In vivo, PhzD catalyzes the hydrol…
Designed materials and new tools hold the key for future science and technologies. Building materials from the bottom up is complementary to traditional top-down materials processing, but requires a deep understanding of the individual molecular structures, their assemblies, and dynamic behaviors. This approach, using…
The interaction between individual nanotubes in MoS 2 bundles is investigated here using an atomic force microscope (AFM). Upon elastically deforming the ropes with the AFM, the value of the bending modulus of the MoS 2 tube ensemble could be evaluated. This is turn could be used to obtain a lower estimate of the shea…
A model is developed to predict the transient shape evolution of an ellipsoidal Newtonian droplet with interfacial tension, suspended in another Newtonian fluid with a different viscosity. Using the Eshelby equivalent inclusion theory [Eshelby (1957)], this model adds an approximate interfacial tension term to the exa…
Compositionally graded barium strontium titanate [(BaxSr1−x)TiO3—BST, x=0.75, 0.8, 0.9, and 1.0] thin films are fabricated by pulsed-laser deposition on a LaAlO3 substrate with (La0.7Sr0.3)MnO3 as the bottom electrode. A high dielectric permittivity and temperature characteristic without Curie–Weiss law are obtained.…
Wetting of porous templates by multi‐component mixtures followed by demixing and controlled morphology ripening is a universal method to prepare nanotubes with tailored wall morphologies (see Figure). This is demonstrated here exemplarily by means of palladium nanotubes with a specific nano‐roughness and porosity.
A novel crystalline mesoporous CdS semiconductor (see Figure) has been synthesized with the aid of a mesoporous silica template through a simple single precursor decomposition route at low temperature. The precursor used—cadmium thioglycolate [Cd 10 S 16 C 32 H 80 N 4 O 28 ]—is not only the Cd but also the S source. T…
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…