Materials Literature
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This Account describes a new paradigm for the relationship between the geometry of metallic nanostructures and their optical properties. While the interaction of light with metallic nanoparticles is determined by their collective electronic or plasmon response, a compelling analogy exists between plasmon resonances of…
The structure of anthraflavic acid (2,6-dihydroxyanthraquinone), C14H8O4, an isomer of the alizarin dye, adopts a planar conformation, with crystallographic mm symmetry. Its crystal packing, which can be described as superimposed sheets of molecules (like a graphite structure), is very different from that of alizar…
New liquid-crystalline biphenyl carboxylates with an achiral swallow-tail derived from 1,3-dialkoxy-2-propanol <TEX>$[(ROCH_2)_2CHOH$</TEX>] where R is methyl, ethyl, propyl, butyl, <TEX>$CH_2CF_3$</TEX>, and <TEX>$CH_2CF_2CF_3$</TEX> were prepared. These achiral liquid crystals having 1,3-dialkoxy-2-propyl moieties e…
Abstract The in situ formation of an emitter in monocrystalline silicon thin‐film solar cells by solid‐state diffusion of dopants from the growth substrate during epitaxy is demonstrated. This approach, that we denote autodiffusion, combines the epitaxy and the diffusion into one single process. Layer‐transfer with po…
Abstract In this paper we describe the size‐controlled synthesis ofa silver nanocomplex based on the reduction of silvernitrate (AgNO 3 ) by UV‐irradiated tungstosilicate acid [H 4 (SiW 12 O 40 ), TSA] solution. This method allows the synthesis of ellipsoidal particles with an average size that is tunable between 2.4…
Abstract Summary: Dendrons and dendrimers with cationic amino groups at their periphery were successfully synthesized up to the third and second generation, respectively. The results obtained by 1 H NMR spectroscopy and gel permeation chromatography analysis supported the formation of the targeted dendrons and dendrim…
Cobalt (cyclam) complex has been successfully immobilized onto SBA-15, and proven to be an active catalyst for the epoxidation of styrene with tert-butyl hydroperoxide as a terminal oxidant. The selectivity for styrene oxide was observed to be up to 66% with 40% styrene conversion after 12h reaction time. The reversib…
We report here, for the first time, the role of the molecular design on the liquid crystalline and solid-state photoluminescent properties of soluble and thermally stable liquid crystalline perylenebisimide derivatives. A new series of perylenebisimides were designed and developed for this purpose by adopting the stoi…
A molecular dynamics (MD) simulation study has been carried out to understand the stability of the triple helical collagen models. The calculations show that the presence of the aspartic acid residue in different positions leads to the local variation in the structure. Analyses of root-mean-square deviation (RMSD), ra…
Using in situ schlieren microscopy, we have studied the growth process of nickel sulfate hexahydrate crystals in a gradient magnetic field under conditions where convection is suppressed, to investigate whether the features that occur here are the same as those that occur during microgravity crystal growth. An expansi…
Abstract We report the synthesis and characterization of 10 novel polyamides containing the benzo‐18‐crown‐6 subunit and its dipodal counterpart, along with their properties, and a comparison with homologous polyamides bearing benzo‐12‐crown‐4, benzo‐15‐crown‐5, and the corresponding dipodal systems. The anomalous pol…
It is shown that crystalline/crystalline and crystalline/noncrystalline blends can crystallize from the melt such that both components reside in the same spherulite. The observed morphology of such systems is that of growth arms of one component separated by regions rich in the other component. For crystalline/crystal…
The interaction of small gold clusters (Au(n), n = 1-4, 20) and a gold monolayer with the MgO (100) surface surrounding a neutral oxygen vacancy (F(s) center) is investigated using density-functional (DF) calculations. It is found that the presence of the defect modifies the interaction of gold not only with the vacan…
Precursor phenomena are critical issues for martensitic transformation, as they provide important clues for understanding the origin of the transformation and the structure of the transformation products. Prior to temperature-induced martensitic transformation, it has been recognized for a long time that the basal pla…
Abstract Novel hyperbranched poly(amido amine)s containing tertiary amines on the backbones and acryl or secondary amines as the surface groups were successfully synthesized via the Michael addition polymerizations of a triacrylamide [1,3,5‐triacryloylhexahydro‐1,3,5‐triazine (TT)] and a difunctional amine [ n ‐butyla…
Abstract Summary: A simple method for the fabrication of a chemical composition gradient from organic to inorganic by the pyrolysis of a polymethylsilsesquioxane (PMSQ) thin film in a gradient temperature field is reported. The resultant chemical gradient surface demonstrates gradual changes in wettability, and slight…
Abstract A series of cerium alkoxides were synthesized from the reaction of Ce{N[Si(CH 3 ) 3 ] 2 } 3 and the appropriate alcohol: neopentyl alcohol [H–OCH 2 C(CH 3 ) 3 = H‐ONep], tert ‐butyl alcohol [H–OC(CH 3 ) 3 = H‐O t Bu], o ‐( tert ‐butyl)phenol {H–OC 6 H 4 [C(CH 3 ) 3 ]‐2 = H‐ o BP}, 2,6‐dimethylphenol [H–OC 6 H…
The adsorbate species present during partial oxidation of methanol on a Cu(110) surface have been investigated in the 10(-5) mbar range with in situ x-ray photoelectron spectroscopy and rate measurements. Two reaction intermediates were identified, methoxy with a C 1s binding energy (BE) of 285.4 eV and formate with a…
Eine neue Geometrie für Polyoxoniobate findet sich in {Nb24O72H9}15−, dem größten bislang bekannten Isopolyoxoniobat-Clusteranion. Die Entwicklung seiner Struktur von isolierten Lindqvist-Anionen [Nb6O19]8− und der cyclischen Pyrochloreinheit [Nb6O30] hin zum komplexen Dimer [({Nb24O72H9}{Cu(en)2(H2O)}2{Cu(en)2})2]18−…
Angle-resolved photoemission spectroscopy (ARPES) has been performed on quasi-one-dimensional ${\mathrm{Li}}_{0.9}{\mathrm{Mo}}_{6}{\mathrm{O}}_{17}$ using photon energy $h\ensuremath{\nu}=500\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. Measured band dispersions are in agreement with those from both low-photon-energy meas…