Materials Literature
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To explore the relationship between local electromagnetic field enhancement and the large SERS (surface enhanced Raman scattering) enhancement that enables the observation of single molecule Raman spectra, we measure both resonant Rayleigh scattering spectra and rhodamine 6G Raman spectra from single Ag particles. Our…
MnBi/Al/MnBi thin films were prepared by using an electron-beam evaporation method then vacuum annealing. The effective magnetic anisotropy constant K eff of the MnBi/Al/MnBi thin film increases compared with MnBi thin film of similar magnetic thickness without an Al interlayer. This increase of K eff may be caused by…
Pure and chromium substituted barium ferrites BaFe 12- x Cr x O 19 (0 x 6.0) have been synthesised in air by self-propagating high-temperature synthesis (SHS): a combustion process involving a reaction of barium peroxide, iron oxide, chromium oxide and iron metal powder. Two series of SHS samples were produced: series…
Burkholderia sp. was grown on sucrose-containing mineral salts medium with phosphate limitation to induce poly(hydroxyalkanoate) (PHA) accumulation. Under these conditions the cultures accumulated 3-hydroxybutyric acid (3HB) and 3-hydroxy-4-pentenoic acid (3HPE) containing polyesters. Solvent fractionation of the puri…
A series of phosphorus(V), germanium(IV), and tin(IV) porphyrin-based, "axial-bonding"-type hybrid trimers have been readily constructed by employing a new "building-block" approach. The approach is modular in nature, and it involves simple "inorganic" reactions such as axial bond formation of main group element conta…
Two series of redox-active, iron−sulfur core dendrimers of the general structure (nBu 4 N) 2 [Fe 4 S 4 (S-Dend) 4 ] (Dend = dendrons of generations 1 through 4) were prepared. Heterogeneous electron-transfer rate constants indicated that the rigid series of dendrimers were more effective at attenuating the rate of ele…
Transport behavior of monovalent and divalent solutes across mesoporous Anopore γ-alumina membranes was investigated as a function of pore diameter, pH, ionic strength, and nature of the salt or complexing species in solution. Radiotracers 137 Cs, 85 Sr, 22 Na, and 45 Ca were present in the feed solutions at very low…
Reduction in the amount of ammonia in fuel gas from biomass gasification was studied. Experiments were carried out in a fixed-bed reactor at 200−1000 °C, 21 atm. A kinetic model for ammonia decomposition was developed. The partial pressure of hydrogen in the fuel gas was a key factor to model ammonia decomposition. Ac…
The phenanthroline adduct of the tris(2-thenoyltrifluoroaceto- O, O ‘)europium(III) complex, Eu(TTA) 3 phen, was doped into organically modified silicate (ORMOSIL) matrixes via the sol−gel process, and the luminescence properties of the resultant ORMOSIL composite phosphors (ORMOSIL:Eu(TTA) 3 phen) were characterized.…
The charge-ordering states with lattice distortions of a halogen-bridged binuclear-metal mixed-valence complex (called MMX chain), Pt 2 ( dta ) 4 I ( dta = CH 3 CS 2 - ), have been investigated by transport, magnetic, and optical measurements. This complex is a binuclear unit-assembled conductor containing metal−metal…
Using Monte Carlo simulations, we investigate the possibility of an orientational melting transition within a "rope" of (10,10) carbon nanotubes. When twisting nanotubes bundle up during the synthesis, orientational dislocations or twistons arise from the competition between the anisotropic inter-tube interactions, wh…
We discuss the effects of an applied magnetic field on the low energy excitations in the low temperature phase of Yb4As3. We show also why the magnetic interaction of the Yb{3+} ions is nearly of an isotropic Heisenberg spin-1/2 type. A small anisotropy due to an intrachain dipolar interaction leads to the opening of…
Uniform inorganic and hybrid inorganic−organic hollow microspheres have been produced by coating colloidal core templates with alternating layers of oppositely charged nanoparticles and polymer, and thereafter removing the core either by heating or chemical treatment. The multilayers were constructed by consecutively…
The order−disorder transition temperature ( T ODT ) of symmetric styrene−isoprene diblock copolymers (AB) and its hetero-four-arm star analog (A 2 B 2 ) was measured using dynamic mechanical spectroscopy and small-angle X-ray scattering (SAXS). Care was taken to ensure that the arm molecular weights of both AB and A 2…
An analysis of the ligand field stabilization energy which makes allowance for the nephelauxetic effect is shown to give satisfactory results when applied to the hydration enthalpies of the hexaaqua 3+ complexes of the first transition series. The contribution from the nephelauxetic effect is substantial, and the base…
Intense visible upconversion luminescence is observed in a Re(4+)-doped low-phonon host material, Cs(2)ZrCl(6), with excitation in the near-infrared. The upconversion excitation wavelength, temperature, power, and time dependence is studied using variable-temperature absorption and luminescence spectroscopies, and mod…
Despite the great experimental effort carried out over the past years by means of different techniques, the segmental dynamics in the model blend system poly(vinylethylene)/polyisoprene (PVE/PI) is still a topic of strong debate. One of the most controversial questions is the possibility of a bimodal distribution of s…
Many biological processes, such as transmembrane signaling and pathogen-host interactions, are initiated by a protein recognizing a specific pattern of binding sites on part of a membrane or cell surface. By recognition, we imply that the polymer quickly finds and then adsorbs strongly on the pattern-matched region an…
Foreword. Preface. List of Contributors. VOLUME 1. Synthetic Methods. 1 Synthetic Methods for Semiconducting Polymers (Alberto Bolognesi and Maria Cecilia Pasini). 1.1 Introduction and Overview. 1.2 Synthetic Pathways for PA. 1.3 Conjugated Polymers by Step-Growth Polymerizations. 1.4 Block Copolymers. 1.5 Towards Aut…
An extremely easy method for accurately calculating the adiabatic connection of density functional theory is presented, and its accuracy tested on both Hooke's atom and the He atom. The method is easy because calculations are needed only for different values of parameters in the external potential, which can be achiev…