Materials Literature
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The localized acid−base properties of different, aluminum oxide thin layer surfaces have been evaluated with X-ray photoelectron spectroscopy (XPS). Five types of oxide layers were studied, which were produced by oxidizing aluminum in a vacuum, with an alkaline and acidic pretreatment, and in boiling water. The photoe…
We report a lithographic process for creating high-resolution (<10 nm) carbon templates on Si(100). A scanning electron microscope, operating under low vacuum (10E-6 mbar), produces a carbon-containing deposit ("contamination resist") on the silicon surface via electron-stimulated dissociation of ambient hydrocarbons,…
We present the electrodynamic response of TiOBr, which undergoes a transition to a spin-singlet ground state for temperatures below T$_{C1}=28$ K. The temperature evolution of the phonon anomalies indicates, like in \cl, an extended fluctuation regime, extending well above T$_{C1}$. At low frequencies, the spectral we…
Soft X-ray Angle-Resolved Photoemission Spectroscopy is applied to study in-plane band dispersions of Nickel as a function of probing depth. Photon energies between 190 and 780 eV were used to effectively probe up to 3-7 layers. The results show layer dependent band dispersion of the Delta_2 minority-spin band which c…
We review key experimental and theoretical results on the Barkhausen effect, focusing on the statistical analysis of the noise. We discuss the experimental methods and the material used and review recent measurements. The picture emerging from the experimental data is that Barkhausen avalanche distributions and power…
When the surfaces of Ag nanowires were coated with thin sheaths of Pd/Ag alloys, they exhibited hydrogen absorption/desorption behaviors and capacities similar to those of pure Pd powders or nanotubes. The stronger mechanical strengths of these cable-like nanostructures also allowed them to undergo more absorption/des…
Abstract The common optimum operating conditions for sonochemical and photocatalytic oxidation coupled with the similarity in the mechanism of destruction leading to a possible synergism and the possible elimination of some of disadvantages observed for individual processing techniques due to the effects of the other…
The discovery of reversible 300 K ferromagnetic ordering in a diluted magnetic semiconductor is reported. Switching of room-temperature ferromagnetism between "on" and "off" states is achieved in Co2+:ZnO by lattice incorporation and removal of the native n-type defect, interstitial Zn. Spectroscopic and magnetic data…
We propose a new generation of materials to maximize reversible H2 storage at room temperature and modest pressures (<20 bars). We test these materials using grand canonical Monte Carlo simulations with a first-principles-derived force field and find that the Li pillared graphene sheet system can take up 6.5 mass% of…
Silver-needle shaped crystals of <TEX>$KLa_2Sb_3S_9$</TEX> from <TEX>$K_2S_x$</TEX> flux and <TEX>$KSm_2Sb_3Se_8$</TEX> from NaCl/KCl flux reactions were obtained and their crystal structures were determined by the single crystal X-ray diffraction method. <TEX>$KLa_2Sb_3S_9$</TEX> crystallizes in the orthorhombic nonc…
The relation between the dielectric constant and the particle polarizability for a polarizable liquid composed of Lennard-Jones particles carrying a saturable induced dipole is studied by computer simulations. It is shown that the widely accepted Clausius–Mossotti relation is only valid for low polarizabilities and fa…
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.