Materials Literature
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Center for Smart Light-Harvesting Materials and Department of Polymer Science & Engineering,Hannam University, Daejeon 306-791, KoreaReceived December 23, 2003Key Words : Luminescent lanthanide complexes, Energy transfer pathways, Photosensitization, Planarwaveguide amplifiersLuminescent lanthanide complexes have attr…
Hydrophilic silver nanoparticles (5-30 nm) were prepared as hydrosols in the presence of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), at relatively high Ag + concentrations (up to 0.1 M). The hydrophilic silver nanoparticles could be transferred to an organic phase by solvent exchange induced by inorg…
Abstract The six‐membered ring Hg 3 Te 3 of [Hg 3 Cl 3 (μ‐TePh) 3 ]·2 DMSO {(Ph = C 6 H 5 ; DMSO = (CH 3 ) 2 SO} was opened by redissolution with DMSO, reacting with Co[Hg(SCN) 4 ] and affording polymeric $ {\rm [(DMSO)_2 Co(NC \overline{S)_4(Hg}-TePh)_2]_{\rm n} }$ . The monoclinic novel compound belong to the space…
First-principles electronic structure calculations have been performed to predict chromogenic properties of various candidate structures, including pyrrole monomers and dimers and their derivatives, of the chromophores formed from the reactions of 2,5-hexanedione (2,5-HD), a prototype of neurotoxic aliphatic γ-diketon…
Abstract Three new N ‐salicylidene‐ N ′‐aroylhydrazines tridentate ligands have been prepared: N ‐4‐diethylaminosalicylidene‐ N′ ‐(4‐nitrocinnamoylhydrazine (L 1 ), N ‐4‐diethylaminosalicylidene‐ N′ ‐4‐(2,4‐dinitrophenylethylidene)benzoylhydrazine (L 2 ), N ‐4‐diethylaminosalicylidene‐ N′ ‐4‐(6‐nitro‐2‐benzoxazolyl)be…
Isomerization of all-trans β-carotene and canthaxanthin embedded in solid MCM-41 and Ti−MCM-41 occurs during photoirradiation. The isomerization proceeds with high efficiency, primarily via the carotenoid radical cation (Car •+ ). The intermediacy of Car •+ was confirmed by studies of the isomerization caused by oxida…
Abstract Free radical polymerization of styrene in supercritical CO 2 requires addition of a surfactant to produce polystyrene (PS) in high conversion and molecular weight with well‐defined particle sizes. In this work, we examined a new stabilizer that can provide effective stabilization for the polymerization of sty…
Abstract The incorporation of SO 3 − groups into a polypyrrole backbone was successfully carried out using FSO 3 H/acetonitrile medium. The degree of sulfonation (sulfonation or sulfur‐to‐nitrogen ratio) of polymer was controlled by varying FSO 3 H concentration while the film was being electrodeposited. The cyclic vo…
In a molecular semiconductor, the carrier is dressed with a polarization cloud that we treat as a quantum field of Frenkel excitons coupled to it. The consequences of the existence of this electronic polaron on the dynamics of an extra charge in a material like pentacene can thus be evaluated.
Phosphorylation of phenylalanine hydroxylase (PAH) at Ser16 by cAMP-dependent protein kinase increases the basal activity of the enzyme and its resistance to tryptic proteolysis. The modeled structures of the full-length phosphorylated and unphosphorylated enzyme were subjected to molecular dynamics simulations, and w…
Abstract Single crystals of BPO 4 were grown by chemical transport reactions with PCl 5 using a gradient from 1073 K to 973 K as well as with solvothermal syntheses in the temperature range between 413 K and 523 K using water, ethanol or 2‐propanol as polar protic solvents. The atomic arrangement of BPO 4 was reinvest…
Crystallization is usually a highly selective process, and this selectivity is exploited in the pharmaceutical and other industries as a method of chemical purification. Relatively little is known about how polymorphism and solvate formation can influence the selectivity of crystallizations. We describe a piperidene p…
The chromonic mesogens shown were designed to absorb at different wavelengths and yet display chromonic liquid-crystalline properties in a common solvent. Induced orientation of the mixed liquid crystals by a mechanical shearing force followed by evaporation of solvent produced anisotropic solid films that polarize li…
The Phosphorylation Site Database [http://vigen.biochem.vt.edu/xpd/xpd.htm] provides ready access to information from the primary scientific literature concerning those proteins from prokaryotic organisms, i.e., the members of the domains Archaea and Bacteria, that have been reported to undergo covalent phosphorylatio…
In this work, an integrated thermal gas flow sensor was fabricated and evaluated using a new thermal isolation technique based on a porous silicon membrane over an air cavity in silicon. The fabrication process of a thermal gas flow sensor employing this type of micro-hotplate is described together with the theoretica…
Summary Preservation of organic matter in soils depends on the chemical structure of organic compounds and on the surface properties of the mineral matrix. We tested the effect of mineral surface reactivity on organic matter decomposition by (i) investigating changes of organic matter composition in clay subfractions…
Lithium-sputtering erosion and transport has been measured in the outer divertor of the DIII-D tokamak. The Divertor Materials Evaluation System (DiMES) mechanism places a 2.5 cm lithium spot as a plasma-facing surface in the divertor. Plasma diagnostics and atomic lithium visible spectroscopy are used to measure the…
We report an inelastic neutron scattering (INS) study under a magnetic field on the frustrated molecular spin cluster V 15 . Several field-dependent transitions are observed and provide a comprehensive understanding of the low-energy quantum spin states. The energy gap 2Δ 0 ≈ 27(3) μeV between the two lowest S = 1/2 K…
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Macromolecules, copyright © American Chemical Society after peer review and technical editing by publisher. To access the final edited and published work see https://doi.org/10.1021/ma035542q
The temperature dependence of the electronic and atomic structure of the colossal magnetoresistive oxides La1-xSrxMnO3 (x=0.3, 0.4) has been studied using core and valence level photoemission, x-ray absorption and emission, and extended x-ray absorption fine structure spectroscopy. A dramatic and reversible change of…