Materials Literature
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Abstract This study was carried out to investigate the influences of compounding process and surface treatment on calcium carbonate (CaCO 3 ) filled polypropylene. The compounding process is discussed with reference to a twin‐screw extruder and an internal mixer. The calcium carbonate filler was surface‐treated with a…
Muthmannite, AuAgTe 2 , a rare gold-silver telluride was discovered in a sample from the historical mineralogical collection of the Naturhistorisches Museum of Vienna. The sample is from the gold-telluride deposit of Sacarîmb, Metaliferi Mountains, western Romania. Muthmannite occurs as anhedral grains up to 200 µm as…
Machining of metals is characterised by plastic deformation occurring at high strains, strain-rates and temperatures. In the few predictive machining theories reported in literature, two types of constitutive equations, the power-law relation and Johnson-Cook equation, have mainly been used for describing the material…
For collectively interacting repulsive colloids driven on triangular substrates, we show that a number of distinct dynamical regimes arise as a function of the drive strength. Additionally, we show that for certain directions of drive a spontaneous-symmetry-breaking phenomenon occurs where all the colloids can flow in…
The selective meso-monobromination of 5,15-diarylporphyrins is difficult to achieve and extensive chromatography is required to obtain pure products. A sequence of (i) dibromination, (ii) selective monoinsertion of Pd ( dppe ) (dppe = 1,2-bis(diphenylphosphino)ethane) and (iii) hydrodepalladation using methanolic base…
Abstract A novel combined PE‐CVD/sol–gel approach to oxide‐based nanosystems is proposed and employed for the synthesis of CeO 2 –ZrO 2 nanocomposites. The method consists of the plasma‐enhanced (PE) CVD of ceria (guest) on a zirconia xerogel ZrO x (OH) y (OR) z (host) prepared by sol–gel (SG) at a temperature of 200…
Abstract Based on the latest available crystal data and the reported bond valence parameters, the linear correlation between the bond valence parameter R 0 with B = 0.37 Å for M—O bonds (M = V, Fe and Cu) and the metal oxidation state n is shown for the first time. For V—O bonds, a linear equation of R 0 ∼ n is perfec…
We review the time-dependent density functional theory (TDDFT) and its use to investigate excited states of nanostructures.These excited states are routinely probed using electromagnetic fields.In this case, two different regimes are usually distinguished: i) If the electromagnetic field is "weak" -as in optical absor…
Abstract New bifunctional coupling agents possessing one 2‐oxazoline group and one 2‐oxazinone group were converted in a Haake melt mixer or extruder with PA6 and PA12. It was shown by means of NMR spectroscopic investigations that the 2‐oxazoline group reacted mainly with carboxylic groups whereas the oxazinone group…
Hydrogen-terminated porous silicon (pSi-H) films were fabricated through electrochemical anodization of crystalline silicon in hydrofluoric-acid-based solutions. The pSi-H surface was chemically functionalized by thermal reaction with undecylenic acid to produce an organic monolayer covalently attached to the silicon…
We report a simple and effective method to generate hydrophilicity-contrasted patterns on porous thin films containing nanometer sized pores. The porous thin films were prepared by removal of the organic polymer phase, denoted as porogen, from the nanohybrid of poly (methylsilsesquioxane) (PMSSQ) and the porogen where…
Des anticorps dirigés contre des protéines spécifiques de la nacre, MSI 31 et MSI 60 (respectivement associées au dépôt de carbonate de calcium sous forme de calcite ou d’aragonite) ont été préparés. Ils révèlent par marquage immunohistochimique les régions de l’épithélium du manteau contenant les populati…
Abstract New synthetic methodologies towards hydrogen bonded supramolecular polymers are described. Focus is directed on synthetic work towards telechelics with hydrogen bonds either as side chain moieties or as endgroups. Physical ordering effects related to polymers and particles are discussed citing own and related…
Abstract The laminar liquid rivulet flow on an inclined flat metal plate and wavy metal plate is taken as a test case to validate the CFD‐simulation results using the VOF (Volume of Fluid) multiphase flow model. The local rivulet thickness was measured using an optically assisted mechanical sensor and compared with th…
The synthesis and characterization of a polycrystalline sample of the n = 1 Ruddlesden−Popper phase La 2 Sr 2 LiRuO 8 are reported. X-ray and neutron diffraction show that the six-coordinate sites are occupied by 1:1 ordered xy layers of Li:Ru, and the nine-coordinate sites are occupied by 1:1 ordered layers of La:Sr;…
Neutral amines-templated mesoporous silica systems impregnated with Reichardt's dye are pink in color if previously dehydrated and white if still covered with hydroxyls: the pink coloration is, however, reversibly restored by exposing the latter sample only to NH 3 and amines. The mechanism of color change is discusse…
X7R‐type BaTiO 3 materials were analyzed using X‐ray diffraction (XRD) and transmission electron microscopy (TEM). Powder XRD indicated that the materials had pseudocubic lattices, but core–shell grain structures predominated in bright‐field (BF) TEM images. Electron diffraction patterns across the core–shell boundari…
Abstract The title compound [Bi(OSi t BuPh 2 ) 3 ] ( 1 ) was prepared by the reaction of [Bi(O t Bu) 3 ] with t BuPh 2 SiOH in toluene at room temperature. The compound crystallizes in the monoclinic space group P 2 1 /n with the lattice constants a = 17.610(1), b = 20.153(1), c = 26.655(1) Å and β = 105.503(3)°. In t…
Two phenylpropanoids from Bupleurum fruticosum (Apiaceae/Umbelliferae) were shown to inhibit the transcriptional activity induced by PMA or TNFα of an NF-κB-controlled reporter gene. Western blot experiments indicated that the phenylpropanoids did not prevent IκBα degradation, suggesting that their molecular target is…
Europium-doped yttrium oxide (Y2O3:Eu3+) nanophosphors were synthesized by wet chemical routes with both combustion and coprecipitation techniques. We explicitly illustrate the dynamics of Y2O3:Eu3+ nanophosphors with a particle size that is influenced by extrinsic stress and revealed by x rays and Raman scattering. T…