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。
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFrom Membranes to Melts, Rouse to Reptation: Diffusion in Polymersome versus Lipid BilayersJames C.-M. Lee, Maria Santore, Frank S. Bates, and Dennis E. DischerView Author Information School of Engineering and Applied Science, Unive…
Equilibrium adsorption isotherms for methane, ethane, ethylene, acetylene, propane, and propylene have been measured for the first time on mesoporous silica, SBA-15, and the data are analyzed by using the Langmuir−Freundlich adsorption isotherm model. The adsorption capacities for ethylene and propylene are found to b…
We consider a mean field model describing the free cooling process of a two component granular mixture, a generalization of so called Maxwell model. The cooling is viewed as an ordering process and the scaling behavior is attributed to the presence of an attractive fixed point at $v=0$ for the dynamics. By means of as…
Nanocomposites of polypropylene- graft -maleic anhydride with organically modified clays have been prepared and characterized by X-ray diffraction and transmission electron microscopy. Their combustion behavior has been evaluated using oxygen consumption cone calorimetry. Synergy is observed between the nanocomposite…
In this work, we present results of a periodic density-functional theory study of the adsorption of carbon monoxide (CO) and hydroxyl (OH) on platinum, ruthenium, and a series on platinum−ruthenium alloys. The surfaces are modeled as four-layer slabs. The binding energies and geometries of CO and OH are computed, as w…
A new approach for the synthesis of colloidal gold shell particles with a dielectric core is described. Small gold nanoclusters were attached to the functionalized surface of colloidal silica particles. Reductive growth and coalescence of these clusters lead to the formation of a closed gold layer. By variation of the…
A pseudo-pentagonal kernel is the central unit in the new quaternary intermetallic phase Li10Mg6Zn31Al3 (see structure). This unit can form the basis for decagonal and, possibly, icosahedral quasicrystals. The synthesis, crystal structure, and bonding of Li10Mg6Zn31Al3 are discussed in detail.
Ein trifunktioneller matrixgebundener Katalysator auf Basis der Metalle Pd, Os und W wurde für die Eintopf-Mehrstufen-Synthese von chiralen Diolen genutzt (siehe Schema; LDH=Schicht-Doppelhydroxid, (DHQD)2PHAL=1,4-Bis(9-O-dihydrochinidinyl)phthalazin, NMM=N-Methylmorpholin).
C3-symmetrische Lactame in der Röhre: Eigens entworfene starre Macrolactamscheiben ordnen sich über Rückgrat-Rückgrat-Wasserstoffbrücken und Van-der-Waals-Kontakte als Endlosröhren an (siehe Schema). Die Röhren bilden wiederum parallel angeordnete Aggregate aus gleichförmig ausgerichteten Dipolen.
Antiferroelectric lead zirconate titanate (PZT) thin films have been prepared by chemical solution deposition using oxide powders. The films were processed onto steel substrates coated with a conducting oxide layer of LaSrMnO3. Homogeneous and uniform films up to 3.4 μm thick and with polarization saturation values up…
Contrasting calixarenes: Thermodynamically stable and water-soluble calix[4]arene–LnIII (see picture) complexes may represent a new class of relaxation (Ln=Gd) or luminescent (Ln=Eu, Tb) probes for biomedical studies. The first complete characterization of one of these complexes in water is reported. The GdIII chelate…
A transition metal based biomimic approach is used to realize multistep reactions, composed of multicomponent systems, in a single-pot synthesis of chiral diols mediated by a trifunctional (Pd, Os, W) catalyst anchored to a single matrix (see scheme; LDH=layered double hydroxide, (DHQD)2PHAL=1,4-bis(9-O-dihydroquinidi…
A Ni4O2 core based on a “chair” topology forms the central unit of the tetranuclear nickel(II) complex 1, which possesses μ3-OH− and butane-2,3-dione-monooximate bridges and displays fascinating magnetic properties. The major Ni–Ni interactions in 1 are antiferromagnetic in nature, and the large Nicore-O-Niterminal an…
Abstract An already available non‐associated elastic–viscoplastic constitutive model with anisotropic strain hardening is modified in order to describe both the constitutive parameter dependency on relative density and the spatio‐temporal evolution of strain localization. To achieve this latter goal, two distinct but…
The paper is devoted to a study of hyperfine fields in partially disordered Fe-Si alloys in the concentration range near 25 at. % Si. Experimental data of the M\"ossbauer spectroscopy are explained with the help of the ``first-principles'' calculations.
We discuss the influence of dissipation at a system boundary (film-meniscus interface) on the dynamics of dislocation loops inside a smectic film. This dissipation induces a strong coupling between dislocations-effectively independent of their separation-leading to their nontrivial dynamics. Because of these dynamics,…
The method for quantitative determination of interatomic distances and coordination numbers (CN) in minerals and amorphous compounds by their x-ray absorption near edge structure (XANES) is proposed. The generation of the method and the proof of its main points are based on the revealed theoretical description of XANE…
Copper gets into the ring: A decanuclear cyclic CuII complex is synthesized by direct treatment of CuCl2 with a fluorinated amino alcoholate containing one secondary and one tertiary nitrogen donor (see space-filling diagram; Cu light blue, Cl yellow, O red, N dark blue, C gray). Possible factors that lead to the self…
Not a classical spin-crossover: The heat capacity of the mixed-valence complex {[(n-C3H7)4N][FeIIFeIII(dto)3]}∞ (dto=dithiooxalato, see scheme) exhibits a phase transition at 122.4 K as a result of electron transfer, and gives insight into the cooperative phenomena exhibited by the multifunctional material.
The temperature programmed reduction (TPR) of a single phase Ce0.5Zr0.5O2 solid solution is investigated by using 1H2/Ar and 2H2/Ar mixtures as reducing agents. The effects of mild (700 K) or severe (1273 K) pre-oxidation (MO, SO) on the TPR profile are analysed. It is observed that after SO pretreatment hydrogen acti…