Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
This paper presents results on the flashover of ice-covered insulators at low air pressure. The flashover performance of two different types of insulators covered with polluted ice was experimentally determined and the effects of several determining factors, such as the air pressure, ice severity, and pollution rate,…
Single-molecule (SM) spectroscopic methods were employed to study single site variations in the acidity properties of sol-gel-derived silicate films. The pH-sensitive dye Carboxy SNARF-1 (C.SNARF-1) was used to sense film acidity. Its concentration in the films was maintained at nanomolar levels to allow for SMs to be…
Roll drafting is a mechanical operation that is indispensable when manufacturing staple yams. However, a fiber bundle throughout this operation has a certain number of defects in its regularity of linear density, causing many problems not only for the quality of the textile product but also for the efficiency of the m…
We report theoretical calculations of the magnetoelectric properties in a three-phase multiferroic particulate composite of Terfenol-D, lead-zirconate-titanate (PZT), and polymer based on the Green's function technique. Our results show that the values of the magnetoelectric voltage coefficients are very sensitive to…
We investigate the impact of water on the optical absorption of prototypical silicon clusters. Our clusters contain 5 silicon atoms, tetrahedrally coordinated and passivated with either hydrogen or oxygen. We approach this complex problem by assessing the contributions of three factors: chemical reactivity, thermal eq…