Materials Literature
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For the first time, protein microcrystallography has been performed with a focused synchrotron-radiation beam of 1 microm using a goniometer with a sub-micrometre sphere of confusion. The crystal structure of xylanase II has been determined with a flux density of about 3 x 10(10) photons s(-1) microm(-2) at the sample…
Ln 3+ doped (Yb 3+,Tm 3+ codoped and Yb 3+,Er 3+,Tm 3+ tridoped) NaYF 4 /poly(vinyl pyrrolidone)(PVP) ( M w ≈ 1 300 000) composite fibers with an average diameter of 300−800 nm were prepared by electrospinning and characterized by X-ray diffraction, field emission scanning electron micrography, and Fourier transform i…
CoOOH hierarchically hollow spheres consisting of nanorods by self-assembly coupled with bubble templating through a facile one-step hydrothermal route have been demonstrated. An energy-minimizing-driven self-assembly of CoOOH nanorods on the base of O 2 bubbles induced by CTAC is responsible for the formation of hier…
From the Contents: Growth Histories of Mineral Crystals as Seen from their Morphological Features.- Theory of Crystal Growth from Vapor and Solution.- Epitaxal Growth of III-V Compounds.- CVD Diamond Growth.- Laser-Assited Growth and Characterization of Multicomponent Lead-Zirconate-Titanate Films.- Silicon Carbide Cr…
Two-dimensional (2D) zinc oxide (ZnO) nanostructures of thickness 40−100 nm and length up to several micrometers are vertically grown on indium−tin oxide-coated glass substrates by using electrochemical deposition in the temperature range of 22−90 °C. The deposition temperature is found to play a significant role in c…
In many situations, for example, in the cores of a rotating electrical machine and the T-joints of multiphase transformers, the magnetic flux varies with time in terms of both magnitude and direction, i.e., the local flux density vector rotates with varying magnitude and varying speed. Therefore, it is important that…
The effect of solvent molecule on the emission properties of Sm(hfa)3(phen)2 (hfa = hexafluoroacetylacetonato, phen = phenanthoroline) was investigated using acetone, acetonitrile, and pyridine. 5G(5/2) --> 5H(9/2) transition intensities in pyridine were found to be larger than those in corresponding acetone and aceto…
We report a detailed photoluminescence (PL) study on single silicon nanocrystals produced by laser pyrolysis. The PL spectra reveal nearly homogeneously broadened zero-phonon lines coupled to Si-O-Si phonon transitions in the SiO2 shell. A systematic investigation of electron-phonon coupling is reported on the basis o…
Raspberrylike organic/inorganic composite spheres are prepared by stepwise electrostatic assembly of polyelectrolytes and silica nanoparticles onto monodisperse polystyrene spheres. Hierarchically structured porous films of silica hollow spheres are fabricated from these composite spheres by layer-by-layer assembly wi…
Well-defined liquid crystal networks with controlled molecular weight between cross-links and cross-link functionality were prepared by "click" cross-linking of telechelic polymers produced by ring-opening metathesis polymerization (ROMP). The networks readily swell in a small molecule liquid crystal, 5CB, to form LC…
We report a new approach for progressive and well-controlled downsizing of nanostructures below the 10 nm scale. Low energetic ion beam (Ar+) is used for gentle surface erosion, progressively shrinking the dimensions with ~ 1 nm accuracy. The method enables shaping of nanostructure geometry and polishing the surface.…
High-level ab initio calculations using multiconfigurational perturbation theory [complete active space with second-order perturbation theory (CASPT2)] were performed on the transition energy between the lowest high-spin (corresponding to (5T2g) in Oh) and low-spin (corresponding to 1A1g in Oh) states in the series of…
We have investigated the role of doping and paramagnetic states on the electronic transport of networks assembled from freestanding Si nanocrystals (Si-NCs). Electrically detected magnetic resonance (EDMR) studies on Si-NCs films, which show a strong increase of conductivity with doping of individual Si-NCs, reveal th…
We present results from our joint experimental and theoretical study of the reactivity of anionic and cationic gold oxide clusters toward CO, focusing on the role of atomic oxygen, different charge states, and mechanisms for oxidation. We show that anionic clusters react by an Eley-Rideal-like mechanism involving the…
Magnetostructural instability in the ferromagnetic shape memory alloy of composition ${\mathrm{Ni}}_{2}{\mathrm{Mn}}_{1.4}{\mathrm{Sn}}_{0.6}$ is investigated by transport and magnetic measurements. Large negative magnetoresistance is observed around the martensitic transition temperature $(90--210\phantom{\rule{0.3em…
The image formation mechanism in Piezoresponse Force Microscopy (PFM) of capacitor structures is analyzed. We demonstrate that the spatial resolution is a bilinear function of film and top electrode thicknesses, and derive the corresponding analytical expressions. For many perovskites, the opposite contributions of d3…
The general approach for the consideration of the magnetoelectric effects in ferroic nanorods is proposed in the framework of the phenomenological theory. The intrinsic surface stress, magneto- and electrostriction, as well as piezoelectric and piezomagnetic effects are included in the free energy. The intrinsic surfa…
Small-angle neutron scattering with contrast variation can fill important gaps in our understanding of biomolecular assemblies, providing constraints that can aid in the construction of molecular models and in subsequent model refinements. This paper describes the implementation of simple tools for analysing neutron c…
Second-order correlation functions for photon pulses associated with exciton-biexciton cascades are theoretically derived. A finite efficiency in photon detection and statistical distribution in exciton numbers are taken into account. It is found that the bunching peak height of photon statistics (g(2)(0)) depends on…
Graphene nanoribbons (GNRs) based T junctions were designed and studied in this paper. These junctions were made up of shoulders (zigzag GNRs) joined with stems (armchair GNRs). We demonstrated the intrinsic transport properties and effective boron (or nitrogen) doping of the junctions by using first principles quantu…