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。
Acoustic cavitation, the primary mechanism of sonochemical effects, is known to be induced more easily by standing waves than by progressive waves. It has been found that acoustic cavitation can be an order of magnitude enhanced by superimposing the second harmonic on the fundamental. Significant synergistic effects b…
Time-resolved studies of luminescence from ytterbium in solution are reported offering opportunities for luminescent imaging in the near IR, and allowing the use of a wide range of aromatic antennae to sensitise the metal centre; the luminescence of the solvated ion and of a wide variety of complexes is examined, both…
ZnS nanocrystals have been synthesized in polymer matrices. Absorption spectrum and small-angle X-ray scattering studies showed that the size of the ZnS nanoparticles wasca. 3.0 nm. Electron diffraction results showed that the ZnS nanocrystals have hexagonal structure. A ZnS nanoparticle/polymer composite as an emitte…
Cu I ions and ligand L self-assemble to generate in solution a mixture of the double helical 1, triangular 2 and square grid 3 complexes, from which 1 has been crystallized and its crystal structure determined.
Mechanical properties of pineapple leaf fiber reinforced low density polyethylene composites have been studied with special reference to the effects of interface modifications. Various chemical treatments using reagents such as NaOH, PMPPIC, silane and peroxide were carried out to improve the interfacial bonding. Both…
Interfaces in liquid-phase sintered Si3N4 materials were investigated employing both analytical and high-resolution transmission electron microscopy techniques (AEM, HREM). Owing to the sintering process that involves the addition of metal oxides to the Si3N4-starting powder, densified materials are composed of Si3N4-…
Synthetic CaCO 3 vaterite obtained by classical routes consists of shapeless particles. However, owing to their small size (50 nm), the particles tend to agglomerate strongly, thus resulting in spherical packs of 3 µm average diameter. Transmission electron microscopy studies of isolated particles are therefore very d…
Efficient second‐order nonlinear optical materials are produced by optimizing the orientation of non‐centro‐symmetrically packed donor–acceptor chromophores. Practical approaches for inducing the favored alignment, for example incorporation of chirality into the chromophore (as shown in the Figure) and H‐bond‐induced…
The modification of poly(propylene imine) dendrimers with apolar endgroups yields effective and highly selective basic extractants of anionic dye molecules from water to solvents, like dichloromethane and toluene.
Ti-β and Ti-MCM-41 catalysts are able to epoxidize methyl oleate using hydrogen peroxide or tert-butyl hydroperoxide as oxygen donors with high conversions and epoxide selectivities.
The evolution of microstructure in dry plain-weave fabric during large shear deformation is described. The entire geometry of the unit cell is defined by four sinusoidal curves in terms of the yarn width, yarn spacing and fabric thickness. The change in microstructure throughout shear deformation prior to wrinkling is…
The molecular charge-transfer salt β″-(bedt-ttf) 4 [(H 2 O)Cr(C 2 O 4 ) 3 ]·PhCN [bedt-ttf = bis(ethylenedithio)tetrathiafulvalene], containing paramagnetic Cr III ions (S = 3/2), is a superconductor with T c = 6.0(5) K.
Angle resolved X-ray photoelectron spectroscopy (AR-XPS) has been used for characterizing native oxide layers formed on the surface of ultra high-purity iron and copper by exposure to air at room temperature. Thickness of an oxide layer formed on the surface of ultra high-purity iron is found to be thicker than that f…
Abstract
This contribution is concerned with the synthesis and characterization of two new iron(II) spin-crossover dinuclear compounds of the formula [Fe(bpym)(NCSe) 2 ] 2 (bpym) ( 2 ) and [Fe(bt)(NCSe) 2 ] 2 (bpym) ( 4 ), where bpym = 2,2‘-bipyrimidine and bt = 2,2‘-bithiazoline. Evidence for a S = 2 (high spin, HS) ↔ S = 0 (…
The regeneration kinetics of the integral membrane protein bacteriorhodopsin have been investigated in a lipid-based refolding system. Previous studies on bacteriorhodopsin regeneration have involved detergent-based systems, and in particular mixed dimyristoylphosphatidylcholine (DMPC)/CHAPS micelles. Here, we show th…
The relative shift of the Eu(III) 7 F 0 − 5 D 0 transition toward lower energies due to the formation of inner-sphere Eu(III) complexes is shown to be linearly proportional to the total ligand donor number of the ligand bound to Eu(III) for 40 organic ligand complexed species in both water and DMSO solvents. Such a co…
This paper presents a brief survey of the structures and properties of early transition-metal oxides containing d0 and d1–d0 electronic configurations. The metal–oxygen (MO6) octahedron, which is the essential structure building unit of these materials, exhibits a characteristic out-of-centre distortion for the d0 con…
Template technique makes it possible to prepare Pt metal-filled uniform carbon nanotubes in which the metal is present as either nanorods or nanoparticles.
4-Substituted n -5,5,6,6,7,7,8,8,9,9,10,10,10-tridecafluorododecan-1-yloxybenzenes, n -5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,12-heptadecafluorododecan-1-yloxybenzenes, and 2-methyl-4-substituted n -5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,12-heptadecafluorododecan-1-yloxybenzenes were synthesized and characterized by a c…