Materials Literature
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The structural, electrical transport and magnetic properties of perovskite oxides La1-xTexMnO3 have been investigated and thus the magnetic phase diagram of La1-xTexMnO3 compounds as a function of temperature and the doping level x has been obtained. All samples have rhombohedral structure and undergo paramagnetic-fer…
A prototype Hamiltonian for the generic patterned magnetic structures, of dipolar interaction with perpendicular anisotropy, is investigated within the finite-size framework by Landau-Lifshift-Gilbert classical spin dynamics. Modifications on the ground state phase diagram are discussed with an emphasis on the disappe…
Temperature-programmed reduction (TPR), synchrotron-based time-resolved X-ray diffraction (TR-XRD), extended X-ray absorption fine-structure (EXAFS), and X-ray absorption near-edge structure (XANES) were employed in this work to systematically study the reaction of CuO and Cu 2 O with CO gas molecules. Both TPR and is…
The growth dynamics of water drops condensed on a superhydrophobic geometrically patterned surface were studied. Drop size evolution at early and intermediate times is self-similar. Drop growth laws do not differ for a flat surface because of a reduction of both drop and substrate dimensionality. A striking observatio…
An alternating-current (ac) magnetic susceptibility measurement for the [(Pc)(2)Tb(III)](0) complex (Pc = phthalocyaninato) has shown that ligand oxidation of the anionic [(Pc)(2)Tb(III)](-) complex gives rise to a significant upward shift of the temperature range where the magnetization response shows a phase lag beh…
Carbon nanotubes, which consist of rolled graphene sheets built from sp(2) hybridized carbon atoms, are now attracting scientists from various disciplines due to their fascinating physico-chemical properties. In this account, we will review the recent progress on the synthetic techniques for the large-scale production…
Die hierarchische Mikro-/Nanostruktur und die niedrige Oberflächenenergie sind die Ursachen der Superhydrophobie eines Polystyrolfilms, der nach einem elektrohydrodynamischen Verfahren erzeugt wurde: Poröse Mikrokügelchen steigern die Superhydrophobie, indem sie die Oberflächenrauheit erhöhen, und eingewobene Nanofase…
Magnetic, highly porous ordered carbon of the CMK-3 and CMK-5 type and with pure carbon or carbon–nitrogen framework were nanoengineered by a sequence of bulk manipulation steps. The materials can be used as efficient magnetic adsorbents (see picture) or catalysts, but applications going far beyond these can be envisa…
A review of the electronic, thermal and mechanical properties of nanotubes is presented, with particular reference to properties that differ from those of the bulk counterparts and to potential applications that might result from the special structure and properties of nanotubes. Both experimental and theoretical aspe…
The oxides that contain both a d 0 transition metal (Ti 4+, Nb 5+, W 6+, etc.) and a lone-pair cation (Sn 2+, Se 4+, Te 4+, etc.) are examined to investigate the influence of the lone-pair cation on the intra-octahedral distortion of the d 0 transition metal. The direction and magnitude of the out-of-center distortion…
A hierarchical micro/nanostructure and low surface energy result in superhydrophobicity in a polystyrene film prepared by the electrohydrodynamics method. The composite film consists of porous microspheres, which contribute to superhydrophobicity by increasing the surface roughness, and interwoven nanofibers, which re…
Highly fluorescent, water-soluble, few-atom Au quantum dots have been created that behave as multielectron artificial atoms with discrete, size-tunable electronic transitions throughout the visible and near IR. Correlation of nanodot sizes with emission energies fits the simple relation, EFermi/N1/3, predicted by the…
When a crystal deforms plastically, phenomena such as dislocation storage, multiplication, motion, pinning, and nucleation occur over the submicron-to-nanometer scale. Here we report measurements of plastic yielding for single crystals of micrometer-sized dimensions for three different types of metals. We find that wi…
The anion-exchange property of upgraded metal cation-mediated bridged hybrid mesoscopic material (MBH-S) is greatly improved by replacing initial unidentate ligands with chelating ligands in the framework. Compared to conventional MBH samples, the upgraded MBH-S shows a well-ordered hexagonal mesostructure and a remar…
Abstract Poly(9‐fluoreneyl methacrylate) was obtained through anionic polymerization with t ‐BuLi and t ‐BuMgBr and through radical polymerization with α,α′‐azobisisobutyronitrile. Anionic polymerization with t ‐BuLi in tetrahydrofuran and radical polymerization afforded syndiotactic polymers ( rr ∼ 90%), whereas anio…
Ammonia adsorption on Ni(111) and on oxygen-pretreated Ni(111) has been studied using metastable induced electron spectroscopy and ultraviolet photoelectron spectroscopy at room temperature. Both techniques allowed us to report on the electronic structure of the valence band. The nickel oxidation leads to the existenc…
Abstract The novel family of the Dawson‐type tungstomonoarsenate [H 4 AsW 18 O 62 ] 7− has been extended by preparing for the first time its monolacunary species and its first‐row transition‐metal ion substituted derivatives. All compounds were characterized by elemental analysis, IR and UV/Vis spectroscopy and repres…
Abstract Broadband dielectric spectroscopy was used to study the segmental (α) and secondary (β) relaxations in hydrogen‐bonded poly(4‐vinylphenol)/poly(methyl methacrylate) (PVPh/PMMA) blends with PVPh concentrations of 20–80% and at temperatures from −30 to approximately glass‐transition temperature ( T g ) + 80 °C.…
Abstract The melting temperature and heat of fusion were measured for an extensive series of compositionally uniform copolymers of ethylene with butene‐1, hexene‐1, and octene‐1. Fractions and whole polymers that exhibited minimal interchain compositional heterogeneity were from commercial copolymers made with either…
An on-line X-ray diffraction system capable of monitoring and identifying the polymorphic form of organic materials crystallized during batch crystallization processes is described. The overall system comprises a conventional X-ray source, monochromator, collimator, slits, curved position sensitive detector, and a flo…