Materials Literature
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The syntheses, structures, and characterization of three new mixed metal selenites, Al 2 (Se 2 O 5 ) 3, Ga 2 (Se 2 O 5 ) 3, and In 2 (Se 2 O 5 ) 3 are reported. Al 2 (Se 2 O 5 ) 3 and Ga 2 (Se 2 O 5 ) 3 are isostructural to Cr 2 (Se 2 O 5 ) 3 and crystallize in the monoclinic space group P 2 1 / n (No. 14) with a = 10…
We show that the morphology of polyethylene oxide crystallization in thin films can be tuned to obtain circular spherulites, seaweed and symmetric dendrites, and fractal aggregation forms through the addition of clay particles and the amorphous polymer, polymethyl methacrylate. The thin-film polymer crystallization pa…
Nanosheet sols of exfoliated layered niobate K4Nb6O17 exhibited a drastic increase in viscosity upon acidification to form unusual pseudoplastic gels, which may be applicable as future soft nanomaterials.
A general synthetic approach to variously polarised merocyanines and a cyanine with enhanced thermal and (photo)chemical stability by a locked all-trans conformation (derived from a rigidified hexatriene unit and a variety of common donor and acceptor groups) is presented as well as a systematic study of their (non)li…
Globally conserved phase ordering dynamics is investigated in systems with short range correlations at t=0. A Ginzburg-Landau equation with a global conservation law is employed as the phase field model. The conditions are found under which the sharp-interface limit of this equation is reducible to the area-preserving…
Polyaniline (PANI)-intercalated graphite oxides (GOs) or FeOCl were synthesized via exchange reaction of n-hexadecylamine-intercalated graphite oxides or FeOCl by PANI in an organic solvent. PANI-intercalated GOs with interlayer spacings (Ic values) of 1.14–1.68 nm and compositions of (PANI)1.1–5.0GO were obtained, de…
Immobilized gold nanoparticles on a three-dimensionally ordered macroporous (3DOM) film were prepared by a dipping method. The localized surface plasmon resonance of the nanoparticles and the stop-band of the 3DOM film, both still evident after immobilization, are both dependent on the refractive index of the surround…
Intramolecular energy transfer from a non-protonated phenanthridine chromophore to ytterbium occurs rapidly despite negligible overlap of the triplet state of phenanthridine with the absorption band of the metal centre. This can be explained by a sequential electron transfer and back electron transfer, or redox, mecha…
Unknown in bulk BaI2: Ba coordination numbers of 5 and 6 are present in the one-dimensional (1D) crystal chains formed by BaI2 within single-walled carbon nanotubes (SWNTs). This is revealed by high-resolution transmission electron microscopy images (I). The derived structure model II shows the bond angles measured fo…
Immobilisation of Co-salen and Co-fluomine onto ordered mesoporous silica has been achieved through coordination of the cobalt to pyridine or imidazole groups covalently attached to the silica matrix. Two routes have been investigated to obtain mesoporous hybrid materials containing coordinating ligands: post synthesi…
The structures of the liquid crystalline chiral subphases exhibited by several materials containing either a selenium or sulphur atom have been investigated using a resonant x-ray scattering technique. This technique provides a unique structural probe for the ferroelectric, ferrielectric, antiferroelectric, and SmC(*)…
Alternating naphthyridine–pyrimidine strands self-organize into a helical conformation containing a strongly polar cavity. The binding of metal and ammonium cations promotes supramolecular self-assembly in a sort of effector-induced growth process to form polymolecular stacks (see schematic representation) and fibers…
A 3-D shape nonlinear optical chromophore encapsulated by highly-fluorinated dendrons exhibits significantly improved electro-optic properties and optical attenuation.
Orientierte Anlagerung macht's möglich: Einkristalline ZnO-Nanostäbchen von bis zu 500 nm Länge lassen sich schrittweise aus quasisphärischen Nanoteilchen herstellen. Erst nach der Bildung perlenkettenartiger Strukturen (Bild links) schließen sich die aggregierten Partikel beim Erhitzen zu Nanostäbchen zusammen (Bild…
Reaction of alpha-P(2)W(15)O(56)(12-) and Fe(III) in a saturated NaCl solution produces a trisubstituted Wells-Dawson structure with three low-valent metals, alpha-(Fe(III)Cl)(2)(Fe(III)OH(2))P(2)W(15)O(59)(11-) (1). Dissolution of this species into 1 M NaBr (Br(-) is non-coordinating) gives the triaquated species alp…
Molybdän-Monster: Die Herstellung eines gewaltigen Molybdän-Clusters wird beschrieben, wobei große Untereinheiten jeweils unterschiedliche lokale Symmetrien aufweisen (die Farben im Bild repräsentieren die kleineren Molybdat-Fragmente). Verknüpft werden diese Molybdat-Fragmente durch einen „Split-and-Link“-Prozess auf…
We present high-resolution measurements of the coefficient of thermal expansion $\ensuremath{\alpha}(T)=\ensuremath{\partial}\mathrm{ln}l(T)/\ensuremath{\partial}T$ of the quasi-two-dimensional (quasi-2D) salts $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}X$ with $X=\mathrm{Cu}(\mat…
We discuss crack propagation along the interface between two dissimilar materials. The crack edge separates two states of the interface, ``stick'' and ``slip''. In the slip region we assume that the shear stress is proportional to the sliding velocity, i.e. the linear viscous friction law. In this picture the static f…
Ein Wasser-Kontaktwinkel von über 170° kennzeichnet die Oberfläche von unbehandelten, ausgerichteten Polyacrylnitril(PAN)-Nanofasern (das Bild zeigt einen Querschnitt durch die Nanofasern direkt nach der Synthese). Die Nanofasern wurden mittels einfachem Extrudieren einer PAN-Lösung durch ein anodisches Aluminiumoxidt…
Interaction of the homotritopic guest 1,3,5-tris[p-(benzylammoniomethyl)phenyl]benzene tris(hexafluorophosphate) (1a) with dibenzo-24-crown-8 (DB24C8) leads to the sequential self-assembly of [2]-, [3]-, and [4]-pseudorotaxanes 7a, 8a, and 9a, respectively. The self-assembly processes were studied using NMR spectrosco…