Materials Literature
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To understand quantum mechanical transport in a ferromagnetic semiconductor, the knowledge of basic material properties such as the phase coherence length and corresponding dephasing mechanism are indispensable ingredients. The lack of observable quantum phenomena has prevented experimental access to these quantities…
Abstract In recent years, there has been increased interest in using microphase‐separated block copolymer thin films as submicrometer/suboptical masks in next generation semiconductor and magnetic media fabrication. With the goals of removing metastable defects in block copolymer thin film simulations and potentially…
The growth of carbon nanotubes from Ni catalysts is reversed and observed in real time in a transmission electron microscope, at room temperature. The Ni catalyst is found to be Ni3C and remains attached to the nanotube throughout the irradiation sequence, indicating that C most likely diffuses on the surface of the c…
A series of novel dendritic polyphenylazomethines (DPA) with asymmetric morphologies was synthesized. Their physical properties, such as encapsulating effect, molecular dynamics, and metal assembly, are strongly dependent on the entire conformation of the molecules. The most important property is layer-by-layer metal…
The pulsed magnetron sputtering of transparent conductive oxide (TCO) films from powder targets is a promising technique, which produces films with dense columnar, defect-free structures and optical and electrical properties comparable to other deposition techniques. The targets are formed from loosely packed oxide po…
We have identified a second RpoH homolog, RpoH(II), in the alpha-proteobacterium Rhodobacter sphaeroides. Primary amino acid sequence comparisons demonstrate that R. sphaeroides RpoH(II) belongs to a phylogenetically distinct group with RpoH orthologs from alpha-proteobacteria that contain two rpoH genes. Like its pre…
The structures of two cyanoaurate-based coordination polymers, M(mu-OH(2))(2)[Au(CN)(2)](2) (M=Cu, Ni), were determined by using a combination of powder and single-crystal X-ray diffraction techniques. The basic structural motif for both polymers contains rarely observed M(mu-OH(2))(2)M double aqua-bridges, which gene…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTMultiporous Material from Fibrillar Syndiotactic Polystyrene IntercalatesSudip Malik, Denis Roizard, and Jean-Michel GuenetView Author Information Institut Charles Sadron, CNRS UPR 22, 6 rue Boussingault, BP 40016, F-67083 Strasbourg Ce…
Diatoms are eukaryotic, unicellular algae that are well known for the intricate architecture of their silica-based cell walls. Species identification is mainly based on variations of their hierarchically organized silica structures. Particularly striking silica frameworks are found among diatoms that belong to the gen…
Introduction Seeds and phytoplankton can be extremely mobile, but usually we are interested in surveying plants that cannot move. Sessile plants are usually arranged over a substrate (soil, sediment, etc.) and can be found, identified and examined at leisure. This characteristic means that, in many ways, it is much ea…
A new electronic structure principle, viz., the minimum magnetizability principle, has been proposed and also has been verified through ab initio calculations, to extend the domain of applicability of the conceptual density functional theory in explaining the magnetic interactions and magnetochemistry. This principle…
Anionic polymerizations of new styrene derivatives, 4-(1-adamantyl)styrene ( 1 ) and 3-(4-vinylphenyl)-1,1‘-biadamantane ( 2 ), were carried out with sec -butyllithium, cumylpotassium, and lithium- or potassium naphthalenide in THF at −78 °C for 3−4 h. The polymerizations of 1 and 2 quantitatively proceeded to afford…
Abstract A series of fully aliphatic polyimidosiloxanes (APISiO) were prepared by poly(addition/condensation) reaction of bicyclo [2,2,2] oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride or cyclobutane‐1,2,3,4‐tetracarboxylic dianhydride and varying compositions of 1,3‐bis (3‐amino propyl)‐tetra methyl disiloxane and rig…
BACKGROUND: The major royal jelly proteins/yellow (MRJP/YELLOW) family possesses several physiological and chemical functions in the development of Apis mellifera and Drosophila melanogaster. Each protein of the family has a conserved domain named MRJP. However, there is no report of MRJP/YELLOW family proteins in the…
Metal and semiconductor nanowire thin films with hierarchical pore structure were electrodeposited using mesoporous silica (primary porogens) containing colloidal silica particles (secondary porogens) as templates. The pore size of the nanowire thin films was independently controlled by the wall thickness of the surfa…
The reaction of M(O2CMe)2.4H2O (M = Ni, Co) with NaN3 in pyridine/MeOH under microwave irradiation and controlled pressure/temperature leads to the formation of the trimetallic species [M3(N3)3(O2CMe)3(py)5] (M = Ni, 1; Co, 2) in 4 min and in high yields. Both complexes display dominant ferromagnetic interactions and…
Abstract Poly( L ‐lactic acid) (PLLA) is generally produced by ring‐opening polymerization of ( S , S )‐lactide, which is prepared from dehydration polycondensation of lactic acid and successive depolymerization. Results of this study show that scandium trifluoromethanesulfonate [Sc(OTf) 3 ] and scandium trifluorometh…
We have studied the magnetic and structural properties of ${\mathrm{PrBaCo}}_{2}{\mathrm{O}}_{5.50}$ and ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.50}$ using neutron and synchrotron techniques between 10 and $425\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A unique structural transition has been detected in this temperature ra…
The diffusivity of spherical colloidal particles close to a planar hard wall is studied by dynamic light scattering with evanescent illumination. A novel setup allows us to independently vary the scattering vector components parallel Q parallel and normal Q perpendicular to the wall. An expression for the initial deca…
The consideration of space charge effects at interfaces results in the prediction of considerable storage anomalies in two-phase materials. They are particularly expected in nano-sized systems building a bridge between chemical and electrostatic storage. These effects are systematically treated in the model of an abru…