Search results for "COATINGS"
showing 10 items of 2386 documents
Different regimes of electronic coupling and their influence on exciton recombination in vertically stacked InAs/InP quantum wires
2006
8 páginas, 8 figuras.
Symmetry and Stability of the Rutile-Based TiO2 Nanowires: Models and Comparative LCAO-Plane Wave DFT Calculations
2012
The rod symmetry groups for monoperiodic (1D) nanostructures have been applied for construction of models for bulk-like titania nanowires (NWs) cut from a rutile-based 3D crystal along the direction of a chosen crystallographic symmetry axis (in this study we consider only Ti atom-centered axes). The most stable [001]-oriented TiO2 NWs with rhombic cross sections are found to display the energetically preferable {110} facets only, while the nanowires with quasi-square sections across the [110] axis are formed by the alternating {110} and {001} facets. For simulations on rutile-based nanowires possessing four different diameters for each NW type, we have performed comparative large-scale ab …
Grazing-Incidence X-ray Diffraction Study of Octadecanoic Acid Monolayers
1998
We report the observation of X-ray scattering profiles from monolayers of octadecanoic acid in the vicinity of room temperature and evidence for the existence near room temperature of all four hexatic rotator phases L2d, Ov, L‘1, and LS, which differ in the details of their molecular tilt. While the incontrovertible triple-reflection signature of the chiral L‘1 phase was not observed, we propose that the previously reported rapid annealing behavior in this phase can lead to the disappearance of one, and in some cases two, of the three peaks.
Asymmetric [N–I–N]+ halonium complexes
2020
The first asymmetric halogen-bonded iodonium complexes [I(py)(4-DMAP)]PF6 (2c) and [I(py)(4-Etpy)]PF6 (2e) were prepared via [N–Ag–N]+ → [N–I–N]+ cation exchange of their analogous 2-coordinate silver complexes. The complexes were characterised by 1H and 1H–15N HMBC NMR spectroscopy, and single crystal X-ray crystallography.
Acyclic imidoselenium(ii) dihalides: synthesis and X-ray structures of ClSe[N(But)Se]nCl (n = 1, 2)
2000
The reaction of SeCl2 with tert-butylamine in THF yields the acyclic imidoselenium(II) dichlorides ClSeN(But)NSeCl and ClSeN(But)SeN(But)SeCl, in addition to the six-membered ring Se3(NBut)3.
Morphologische Strukturen und Rißbildung in kristallinen, makromolekularen Stoffen
1962
Nach einem kurzen Uberblick uber die heutigen Kenntnisse der morphologischen Strukturen (Lamellen, Fibrillen und Spharolithe) werden die Versuche besprochen, und mit Hilfe von Permeations- und Diffusionsmessungen an Terylenfilmen in Abhangigkeit vom Kristallisationsgrade und der Temperatur einen Einblick in das innere Rissystem won makromolekularen Werkstoffen zu bekommen. Es zeigt sich, das man bei schonender thermischer und mechanischer Behandlung eine grobere durchgehende Risbildung u. entsprechende Korrosionsanfalligkeit durchaus vermeiden werden kann. Kristallisiert man zu lange bei zu hohen Temperaturen so tritt Risbildung auf. Hier kommen dann mikroskopische Untersuchungen sowie solc…
Dynamic segregation during ferrite oxidation revealed by XPS
2002
Dynamic segregation phenomena were revealed by XPS during the oxidation of some ferrites (Fe 2.5 Ti 0.5 O 4 , Fe 2.5 Ni 0.5 O 4 , Fe 2 CrO 4 and FeCr 2 O 4 ). This kind of phenomenon induces, at a low temperature (below room temperature), drastic changes in the cationic composition of the most external layers. Dynamic segregation is a function of the cationic composition, the oxidation capability and the morphology of these ferrites. Although dynamic segregation seems to be a quite frequent phenomenon that often can be observed during ferrite oxidation, there are materials in existence where it does not appear, such as molybdenum ferrite.
Magnetic alignment of aliphatic lamellae
1993
Abstract Magnetic alignment of mesophases is normally only considered possible when the molecule contains an aromatic ring system. In this paper we report on the mesomorphous behaviour of a polyalkylacrylate resin with average sidechain length 22 and the alignment of its lamellae in cast films by annealing in a strong magnetic field.
Pressure-Induced Spin State Conversion in Antiferromagnetically Coupled Fe(II) Dinuclear Complexes
2001
The effect of pressure on the thermal dependence of the magnetic susceptibility has been investigated in the 2,2‘-bipyrimidine (bpm)-bridged iron(II) complexes of formula {[Fe(L)(NCX)2]2bpm} (X = S...
Epoxidation of stilbene using supported gold nanoparticles: cumyl peroxyl radical activation at the gold nanoparticle surface.
2014
The catalytic epoxidation of cis-stilbene using cumene as a solvent in the presence of supported gold nanoparticles (AuNP) yields a mixture of cis and trans-stilbene oxides. EPR and product distribution studies support a new mechanistic proposal where oxygen centred radicals activate the AuNP surface and form active surface oxygen species responsible for the epoxidation products.