Materials Literature
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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…
In this paper, an extract from fruits pods of Caesalpinia spinosa (tara) a native leguminosae widely distributed in Peru, known by its high tannin content is evaluated for its utilization in wood adhesives. Commercial pods of tara were extracted for 1 hour with water (1:4w/v) at 65°C. The extract was spray-dried to ob…
The mechanism of the oxidation of cycloalkanes by tertiary alkyl hydroperoxides catalysed by iron(III) dichlorotris(2-pyridylmethyl)amine [FeIIICl2(TPA)]+ and by the acetate bridged (µ-oxo) di-iron complex [Fe2III(TPA)2O(OAc)]3+ has been investigated. Product studies do not support oxidation via a high valent iron–oxo…
We describe a simple method of controlling the channel diameter of the mesoporous molecular sieve MCM-41 in the 26.1–36.5 Å range and the wall thickness in the 13.4–26.8 Å range while using the same gel mixture. This is achieved by varying the synthesis temperature in the 70–200°C range and/or reaction times in the 0.…
Organ or tissue failure remains a frequent, costly, and serious problem in health care despite advances in medical technology. The large number of patients suffering from tissue losses or organ failures is demonstrated by the approximately 8 million surgical procedures and 40 to 90 million hospital days required annua…
The new oxygen-ion conductor La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3-x has been prepared by conventional solid-state reaction at high temperatures and characterised by X-ray diffraction, scanning and transmission electron microscopy, and conductivity (four-probe dc and impedance) measurements. The room-temperature structure i…
Electrical wear-out and dielectric breakdown of insulating polymers involve dissipation to the lattice of the energy of mobile or trapped space charges. Optical emissions are proof of such energy releases and can be used to define the onset of electrical aging and to investigate the dissipation mechanisms. They also c…
In a real system the heating is nonuniform, and a second-order phase transition to a broken-symmetry phase occurs by propagation of a temperature front. Two parameters, the cooling rate τ Q and the transition front velocity ν T determine the nucleation of topological defects. Depending on the relation of these paramet…