Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Manipulation of molecules with nanoscale accuracy is important in nanotechnology. In the novel process reported here, electrostatic interactions direct the deposition of polycationic Mn12 single-molecule magnets into a predefined region of a 1 cm2 silicon chip with 40 nm accuracy (see figure). The process is based on…
The structural dynamics of ultrathin polymer films of poly(ethylene terephthalate) capped between aluminum electrodes have been investigated by dielectric relaxation spectroscopy. A deviation from bulk behavior, appearing as an increase of the relaxation time at a fixed temperature, is observed for films of thickness…
To understand the collective properties of nanoparticles, it is necessary to control the particle size, spacing and ordering. Here we describe the chemical synthesis of well-controlled silver nanoparticles, the wet coat preparation and the optical properties of its film. The light incidence angle and polarization depe…
The computer program DRAWxtl produces crystal structure drawings in the form of an interactive screen representation, as well as VRML files for use on web pages and in classroom teaching, and creates input files for the popular Persistence of Vision Raytracer ( POV-Ray ) rendering program for publication-quality graph…
We report studies of the temperature dependence of the photoluminescence efficiency of single walled carbon nanotubes which demonstrate the role of bright and dark excitons. This is determined by the energy splitting of the excitons combined with 1-D excitonic properties. The splitting of the bright and dark singlet e…
PbSe quantum dots (QDs) are conjugated onto the surface of single-walled carbon nanotubes by a novel ligation procedure. The nanotubes are first surface-functionalized with thiol groups, which enable the adhesion of large numbers of colloidally prepared PbSe QDs. Polymeric nanocomposite IR photosensitizers made from t…
The prehistoric site of Vinuca, on the right bank of the River Danube, the territory of the City of Belgrade, first excavated by Dr Miloje Vasić; (1931-1934) provides Neolithic pottery dating back to 5200 - 4200 B.C. Shards excavated in 1998 (Serbian Academy of Sciences and Arts) have a yellow coating on the external…
We present an experimental method for the in-situ observation of directional-solidification fronts in bulk samples of transparent eutectic alloys. The growth front is observed obliquely in dark field through the liquid and a glass wall of the container with a long-distance microscope. We show that a focused image of t…
Thermoresponsive brushes with a tunable structure are grafted in a controlled way to gold substrates, exploiting an initiator–transfer–terminator agent (iniferter)-based photopolymerization (see figure). The chain length of the polymers is controlled by using UV light as a trigger and the end groups exposed are shown…
Using a Magnetic Resonace Force Microscope, we have performed ferromagnetic resonance (FMR) spectroscopy on parametric magnons created by 4-wave process. This is achieved by measuring the differential response to a small source modulation superimposed to a constant excitation power that drives the dynamics in the satu…
Several properties of chitosan films associated or not with hydroxypropylmethylcellulose polymer (HPMC) and HPMC films incorporating or not nisin and/or milk fat were studied. Nisin addition at a level of 250 microg mL-1 and likewise chitosan at 1% (w/v) concentration were efficient for total inhibiting Aspergillus ni…
We investigate the problem of inelastic x-ray scattering in the spin$-{1/2}$ Heisenberg model on the square lattice. We first derive a momentum dependent scattering operator for the $A_{1g}$ and $B_{1g}$ polarization geometries. On the basis of a spin-wave analysis, including magnon-magnon interactions and exact-diago…
It is shown that the free-carrier (Drude) absorption of circularly polarized radiation in quantum well structures leads to an electric current flow. The photocurrent reverses its direction upon switching the light helicity. A pure orbital mechanism of such a circular photogalvanic effect is proposed that is based on i…
The steady state values of the viscosity and the intrinsic ionic-conductivity of quenched melts are computed, in terms of independently measurable quantities. The frequency dependence of the ac dielectric response is estimated. The discrepancy between the corresponding characteristic relaxation times is only apparent;…
Metal nitride nanoparticles are synthesized using mesoporous carbon nitride, first as a nanoconfinement matrix and then as a nitrogen source. The reaction-confining matrix is thermally decomposed during synthesis, thus becoming a source of nitrogen donation, and removing the need for further purification and isolation…
Amorphous silicon–oxycarbide (SiCO) can retain large mole fractions of carbon when it is made from controlled pyrolysis of silicon‐based polymers. The crystallization resistance of these ceramics, which is quite remarkable, varies with the carbon content. In high‐carbon materials, crystallization is usually accompanie…
The distribution of the magnitudes of damage avalanches during a failure process typically follows a power law. When these avalanches are recorded close to the point at which the system fails catastrophically, we find that the power law has an exponent which differs from the one characterizing the size distribution of…
High Resolution Image Download MS PowerPoint Slide We report on the rapid production, characterization, and spectral properties of uniform nanorods, nanowires, and nanoplates of rare earth oxides (M 2 O 3, M = Pr, Nd, Sm, Eu, Gd, Tb, Dy). The method developed, based on microwave irradiation (MWI), allows the control o…
We calculate the Fermi energy dependence of the (time-averaged) current and shot noise in an impurity-free carbon bilayer (length $L⪡\text{width}$ $W$), and compare with known results for a monolayer. At the Dirac point of charge neutrality, the bilayer transmits as two independent monolayers in parallel: Both current…
Depending on the pH value and salt concentration of Al2O3 suspensions different microstructures can form. Especially the clustered one is of major interest for industrial purposes as found in the production of ceramics. In this paper we investigate the clustered microstructure by means of a coupled Stochastic Rotation…