Materials Literature
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A series of secondary ammonium monocarboxylate salts have been prepared by reacting variously substituted cinnamic acids and benzoic acids with dibenzylamine. Gelation tests reveal that 19 salts (9 cinnamates and 10 benzoates) are moderate to good gelators of various organic fluids, including commercial fuels such as…
Low-coordinated gold atoms play a decisive role in the catalytic cycle of low-temperature CO oxidation or the selective oxidation of olefins. A comparative study of argon and oxygen ion-bombarded Au(111) surfaces (see microstructure images) reveals a threefold role of adsorbed oxygen: structure formation, stabilizatio…
In this communication we present a detailed study of the magnetic properties of ordered Ni-Pt alloys. We study the alloys through field-cooled and zero-field cooled dc magnetization, nonlinear ac susceptibility and sound velocity and internal friction experiments. We also present a theoretical analysis of the magnetic…
The subject of this work is new method of the synthesis of biodegradable copolymers compatible with brain tissue. Copolymerization of glycolide with lactide was conducted in solution or in bulk in the presence of LiBu, LiAcac, MgBu(2), Mg(acac)(2) as initiators. In all cases, copolymers with molecular weight of 20000-…
Electronic assemblies rely heavily on soldering to attach components to the interconnect wiring on printed circuit boards and other types of substrates. In response to environmental legislation, the lead-tin alloys commonly used for soldering are being replaced with lead-free alloys and electrically conductive adhesiv…
The two-photon-resonant first hyperpolarizabilities associated with hyper-Rayleigh and hyper-Raman scattering are reported for 4-dimethylamino-4-nitrostilbene in 1,4-dioxane, dichloromethane, acetonitrile, and methanol, and for an ionic analog, 4-N,N-bis(6-(N,N,N-trimethylammonium)-hexyl)amino-4-nitrostilbene dibromid…
LC-MS/MS was used to identify secreted proteins in the Antarctic archaeon Methanococcoides burtonii. Seven proteins possessing a classical class 1 signal peptide were identified in the supernatant from cultures grown at 4 and 23 degrees C. The proteins included a putative S-layer cell surface protein, cell surface pro…
High-resolution electron energy loss spectroscopy was used to investigate the low-energy collective excitations of the $\mathrm{Cu}(111)$ surface. Measurements showed a collective mode with an energy of $1.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The measured dispersion of the plasmon mode was negative. We suggest th…
Abstract X 1 ‐Y 2 SiO 5 :Eu 3+ and X 1 ‐Y 2 SiO 5 :Ce 3+ and/or Tb 3+ phosphor layers have been coated on nonaggregated, monodisperse, submicron spherical SiO 2 particles by a sol–gel process, followed by surface reaction at high temperature (1000 °C), to give core/shell structured SiO 2 @Y 2 SiO 5 :Eu 3+ and SiO 2 @Y…
Abstract The synthesis, crystal structures, spectroscopic and magnetic properties studies of four trinuclear oxo‐centered carboxylate complexes are reported and discussed: [Cr 3 (μ 3 ‐O){O 2 C(OH)Ph 2 } 6 (H 2 O) 3 ](NO 3 ) · 2H 2 O · 3Me 2 CO ( 1· 2H 2 O · 3Me 2 CO), [Cr 3 (μ 3 ‐O)(O 2 CPh) 6 (H 2 O) 3 ](NO 3 ) · 1.9…
A distinction between two common definitions of Seebeck coefficient is clarified. The effective Seebeck coefficient, which describes the effective electric field induced by a temperature gradient, is found to be a constant for a homogeneous doped semiconductor regardless of its doping.
We describe the small-biomolecule (glycyl glycine)-directed synthesis of single-crystalline silver nanoplates, and different experimental conditions have been explored for a more thorough understanding of the growth mechanism. The yield of silver nanoplates relative to the total number of nanoparticles formed was as h…
Even–odd effects: Oxidation patterns of the mass-selected Aun (n=2–10) clusters deposited on silica surfaces are reported. An additional Au atom can drastically change the oxidation pattern of the Au clusters. Au5 and Au7 (see picture) are suggested to be highly stable upon oxygen exposure. Formation of AuO bonds is…
Abstract A series of heteroleptic and homoleptic bis(phthalocyaninato) lanthanide(III) complexes, namely M(Pc)[Pc(OPh) 8 ], M[Pc(OPh) 8 ] 2 , Eu(Pc)[Pc(SPh) 8 ], and Eu[Pc(SPh) 8 ] 2 [M = Eu, Ho, Lu; Pc = unsubstituted phthalocyaninate; Pc(OPh) 8 = 2,3,9,10,16,17,23,24‐octaphenoxyphthalocyaninate; Pc(SPh) 8 = 2,3,9,10…
Abstract Ordered meso/macroporous hierarchical silica materials have been prepared using block copolymer P123 (EO 20 PO 70 EO 20 ) and an inverse carbon replica of diatom as templates. The silica wall of the diatom was replaced by ordered mesoporous silica, while the micron‐sized diatom architecture was replicated by…
X-ray Photon Correlation Spectroscopy is used here to probe for the first time a glass-forming dispersion of repulsive particles spherical and 10 nm sized. The highly concentrated colloidal system is based on the magnetic and charge-stabilized nanoparticles of a ferrofluid. Their out-of-equilibrium translational dynam…
A study of the structure of isotactic propylene−hexene random copolymers, prepared with single-center metallocene catalysts, is reported. For low concentrations of hexene comonomeric units, up to nearly 10 mol %, copolymers crystallize in the α form of isotactic polypropylene. Copolymers with hexene contents higher th…
Recent progress in the understanding of the fascinating catalysis of CO combustion by supported gold particles is summarized. Focusing on size-selected gold clusters consisting of only a few atoms, that is, the size regime with properties nonscalable from the bulk properties, we discuss the current knowledge of the di…
We study the optical properties of a single core-shell GaAs-AlGaAs nanowire (grown by VLS method) using the technique of micro-photoluminescence and spatially-resolved photoluminescence imaging. We observe large linear polarization anisotropy in emission and excitation of nanowires.
A combined experimental, using X-ray Magnetic Circular Dichroism and theoretical investigation, using full-potential Korringa-Kohn-Rostoker (KKR) Green function method, is carried out to study the spin structure of small magnetic Cr adatom--clusters on the surface of 3 monolayers of $fcc$ Fe deposited on Cu(001). The…