Materials Literature
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Abstract We report observations of single‐molecule detection of thionine and its dynamic interactions on aggregated gold nanoparticle clusters using surface enhanced Raman scattering (SERS). Spectral intensities were found to be independent of the size of Au nanoparticles studied (from 17 to 80 nm) at thionine concent…
A fully automated procedure for detecting and centering protein crystals in the X-ray beam of a macromolecular crystallography beamline has been developed. A cryo-loop centering routine that analyzes video images with an edge detection algorithm is first used to determine the dimensions of the loop holding the sample;…
We present a three-dimensional model based on the finite-element method for solving the time-harmonic Maxwell equation in optics. It applies to isotropic or anisotropic dielectrics and metals and to many configurations such as an isolated scatterer in a multilayer, bi-gratings, and crystals. We discuss the application…
New diyne monomers containing carbazolyl and/or fluorenyl chromophores, namely, 3,6-diethynyl-9-phenylcarbazole ( 1 ), 3,6-diethynyl-9-[6-(9-carbazolyl)hexyl]carbazole ( 2 ), and 2,7-diethynyl-9,9-bis[6-(9-carbazoyl)hexyl]fluorene ( 3 ), are synthesized. Alkyne polycyclotrimerizations are effected by TaX 5 −Ph 4 Sn (X…
Single-crystalline rocketlike tetrapodal CdS nanorods were synthesized via a one-step seed-epitaxial MOCVD approach by thermal decomposition of Cd(S 2 CNEt 2 ) 2 powders. This bottom-up method uses silver particles to initiate and guide the preferential orientation of the axial nanorods, whereas the epitaxial growth o…
The influence of the divalent cation on the thermal decomposition and subsequent reconstruction of Mg 3 −Al, Ni 3 −Al, and Mg 2 −Ni−Al hydrotalcite-like compounds has been investigated by in situ XRD. Diffraction studies were complemented by ICP-OES, AAS, TEM, N 2 adsorption, FT-IR, TGA, and TPD−MS characterizations.…
Abstract Deterioration after excavation of archaeological iron artefacts buried in soil is often associated with the presence of chlorinated phases in corrosion products, leading to serious problems for conservation of metallic objects of cultural heritage. Therefore, in order to better understand the corrosion proces…
A new type of encoded bead, which uses surface-enhanced Raman scattering (SERS), is described for multiplex immunoassays. Silver nanoparticles were embedded in sulfonated polystyrene (PS) beads via a polyol method, and they were used as SERS-active substrates. Raman-label organic compounds such as 4-methylbenzenethiol…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
The chemisorptive behavior of CO on Pd−Au alloy films has been studied by infrared reflection−adsorption spectroscopy (IRAS). Geometric (ensemble) and electronic (ligand) effects have been addressed by comparing the results with the corresponding single-component systems. A unique CO vibrational feature at 2088 cm -1…
The dynamics of dislocations is reported to exhibit a range of glassy properties. We study numerically various versions of 2D edge dislocation systems, in the absence of externally applied stress. Two types of glassy behavior are identified (i) dislocations gliding along randomly placed, but fixed, axes exhibit relaxa…
Classic and recent results for gauge effects on the properties of the normal-to-superconducting phase transition in bulk and thin film superconductors are reviewed. Similar problems in the description of other natural systems (liquid crystals, quantum field theory, early universe) are also discussed. The relatively st…
Phase transformation in finite-size ferroelectrics is of fundamental relevance for understanding collective behaviors and balance of competing interactions in low-dimensional systems. We report a first-principles effective Hamiltonian study of vortex-to-polarization transformation in Pb(Zr0.5Ti0.5)O3 nanoparticles, ca…
In this paper, a real-space analytical expression for the free Green's function (propagator) of bilayer graphene is derived based on the effective-mass approximation. Green's function displays highly spatial anisotropy with threefold rotational symmetry. The calculated local density of states (LDOS) of a perfect bilay…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
We report the synthesis of Cd-substituted ZnO nanostructures (Zn 1− x Cd x O with x up to ≈0.09) by the high-pressure solution growth method. The synthesized nanostructures comprise nanocrystals that are both particles (∼10–15 nm) and rods which grow along the [002] direction as established by transmission electron mi…
Surfactant-passivated germanium nanocrystals (Ge(0) NCs) 3-5 nm in diameter were synthesized and encapsulated with functionalized phospholipids to yield water-soluble Ge(0) NCs. Upon encapsulation, the NCs retained their cubic crystalline phase and displayed good resistance to oxidation, as determined by transmission…
The electronic structure of the interface between Tris (8-hydroxyquinolino)-aluminum (Alq3) and La0.7Sr0.3MnO3 manganite (LSMO) was investigated by means of photoelectron spectroscopy. As demonstrated recently this interface is characterized by efficient spin injection in organic spintronic devices. We detected a stro…
In this paper we show that the vortex states can be created not only in magnetically soft "small" (with the dipolar and exchange energy competition) cylindrical dots, but also in magnetically saturated "big" (when the exchange is neglected) cylindrical dots. A property associated with a vortex structure becomes eviden…
The near nucleus behavior of the exchange-correlation potential $v_{xc}({\bf r})$ in Hohenberg-Kohn-Sham density functional theory is investigated. It is shown that near the nucleus the linear term of $O(r)$ of the spherically averaged exchange-correlation potential ${\bar v}_{xc}(r)$ is nonzero, and that it arises pu…