Materials Literature
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Highly soluble [(tBu(4)PcM)(2)O] phthalocyanine dimers (M=Ga(III) (3), In(III) (4)) were prepared by the reaction of [tBu(4)PcMCl] (M=Ga(III) (1), In(III) (2)) with excess of concentrated H(2)SO(4) at -20 degrees C. The Mbond;Obond;M linkages in 3 and 4 are not stable against concentrated H(2)SO(4) at room temperature…
An effective method for incorporating cadmium ions into mesoporous silica SBA-15 is demonstrated. One of the novel features is the assembly of CdS nanoparticles inside the mesopores by selectively functionalizing the external surface of SBA-15 in order to avoid the possible adsorption of the cadmium ions onto this sur…
A series of homodinuclear platinum(II) complexes containing bridging chalcogenido ligands, [Pt(2)(mu-E)(2)(P empty set N)(4)] (P empty set N=dppy, E=S (1), Se (2); P empty set N=tBu-dppy, E=S (3)) (dppy=2-(diphenylphosphino)pyridine, tBu-dppy=4-tert-butyl-2-(diphenylphosphino)pyridine) have been synthesized and charac…
The preparation of a new beta-tetrasubstituted porphyrin through a short synthesis with liquid crystalline properties in a wide range of temperatures including room temperature is described.
Polymer electrodes for batteries is one possible application of hybrid polymer films synthesized from pyrrole and polyoxometalates (shown in the graphic). These materials have high specific charges, between 30 and 80 mA h g−1, and the dc conductivities at room temperature are between 20 and 220 S cm−1. The synthesis,…
The efficiency of producing biological damage varies with radiation quality. Conventional explanations rely on spatial differences in the radiation track structure; generally however there are also very large temporal differences in delivery of the radiation at the cellular level. High-LET radiation normally deposits…
ABSTRACT A (high strain) low‐cycle fatigue (LCF) life prediction model of ultrafine‐grained (UFG) metals has been proposed. The microstructure of a UFG metal is treated as a two‐phase ‘composite’ consisting of the ‘soft’ matrix (all the grain interiors) and the ‘hard’ reinforcement (all the grain boundaries). The disl…
Bio-inspired optical systems have the potential to transform the process of image collection and analysis in the future. Through simplicity and dynamics these collection systems may provide multiple functions with an excellent level of reliability. From the graded index of the fish-eye to the hyper-acuity of the compo…
The magnetic and electronic properties of the perovskite system $({\mathrm{La}}_{0.7\ensuremath{-}x}{\mathrm{Gd}}_{x}){\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ $(0<~x<~0.6)$ have been investigated by measurements of magnetization, resistivity and magnetoresistance. The substitution of Gd on La sites not only result…
Without large investments in new clean-room facilities, the nano- and microstructures described here can be achieved by the combination of wet-chemistry with existing conventional lithographic techniques. One of the advantages of the method is that it allows the specific formation of aperiodic patterns, which are of s…
The reaction of Zr(OR)4 (OR = OnBu, OnPr) with methacrylic acid was monitored by extended X-ray absorption fine structure (EXAFS), 1H and 13C NMR, HPLC, and Raman measurements. The study revealed that the initial dimeric zirconium alkoxides react rapidly with the carboxylic acid and form higher aggregated multinuclear…
Enhanced photocurrents are detected in the presence of bipyridinium-modified CdS nanoparticles associated with electrodes. The enhanced photocurrents originate from vectorial electron transfer that retards recombination processes. The Figure shows different architectures for CdS nanoparticles on Au electrodes.
Moieties that can be cross-linked appear to be the necessary feature of dendrimers that can be used to make poled polymers displaying high chromophore density, excellent electrooptic properties, and good thermal and temporal stability. Such materials could find use in optical telecommunications and public networking.
Highly ordered boron nanowire multiple nanojunctions (see Figure) with unilateral feather-like morphology have been created via a simple magnetron sputtering method. These T- and Y-type nanojunctions stand freely in line to form uniform and well-oriented arrays on the substrate surface over areas of up to several tens…
A series of chiral phosphine-functionalized poly(propyleneimine) (PPI) dendrimers was synthesized by the reaction of carboxyl-linked C(2)-chiral pyrphos ligand (pyrphos=3,4-bis(diphenylphosphino)pyrrolidine) with zeroth-fourth generation PPI using ethyl-N,N-dimethylaminopropylcarbodiimide (EDC)/1-hydroxybenzotriazol a…
The mechanism of alkene epoxidation by chromium(v) oxo salen complexes has been studied by DFT and experimental methods. The reaction is compared to the closely related Mn-catalyzed process in an attempt to understand the dramatic difference in selectivity between the two systems. Overall, the studies show that the re…
One-step simultaneous immobilization of two enzymes, horseradish peroxidase (HRP) and glucose oxidase (GOx), was achieved in mesoporous materials. β-D-Glucose was the substrate of GOx to yield H2O2, which became the substrate of the second enzyme, HRP. The mesoporous biogels showed two to three orders of magnitude fas…
A general force field methodology is developed for description of molecular interactions in carbon-based materials. The method makes use of existing parameters of potential functions developed for sp(2) and sp(3) carbons and allows accurate representation of molecular forces in curved carbon environment. The potential…
A new technique of metal nanopowder production and in situ coating using a microarc discharge is proposed. The feasibility of this method is demonstrated and preliminary results are presented. The microarc discharge was operated at 1 atm in both pure Ar and natural gas environments. Respectively, aluminium nanoparticl…
It was proposed that nanoparticles of layered compounds are not stable in the planar form and they spontaneously fold into fullerene-like structures and nanotubes (IF phases). Considering the spherical topology of the IF nanoparticles, it was proposed that they could ideally suit tribological applications. In this pap…