Materials Literature
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The crystal structures of two CN - bridged bimetallic copper(II)−chromiun(III) complexes, [{(Cu(dien)) 2 Cr(CN) 6 } n ][Cu(dien)(H 2 O)Cr(CN) 6 ] n ·4 n H 2 O ( 1 ) and [(Cu(edma)) 3 Cr(CN) 6 ] ( 2 ) (where dien and edma are diethylenetriamine and ethylenediaminemonoacetate respectively), have been determined. Complex…
The characteristics of infrared (IR) microbolometer arrays utilizing semiconducting YBaCuO and operating at room temperature are presented. Surface-micromachined structures in the form of 1/spl times/10 arrays of pixel size 40 /spl mu/m/spl times/40 /spl mu/m and 60 /spl mu/m/spl times/60 /spl mu/m as well as single p…
Кристаллические структуры в плазме с сильным взаимодействием макрочастиц, Нефедов А.П., Петров О.Ф., Фортов В.Е.
Equilibrium O 2 and CO binding behaviour of two dendritic iron(II) porphyrin systems is reported.
The acid properties of Al-, Ga- and Fe-substituted mesoporous silicates have been investigated using ammonia as a probe molecule. Substitution leads to the formation of Brønsted and Lewis acid sites of different type and strength. The IR spectra of ammonia-loaded samples show bending vibration bands near 1450 cm -1 (a…
The production of triplet states in basic solution of tetrakis(tetrasulfonated-phenyl)porphyrin (TPPS 4 ) is accompanied by a contraction of (10 ± 3) mL/mol as determined by laser-induced optoacoustic spectroscopy (LIOAS) at different temperatures. The contraction is reverted as the triplet decays. The volume changes…
The mesoporous silicate, MCM-41 is modified by grafting the chiral alkene polymerisation catalyst rac-ethenebis(indenyl)zirconium dichloride onto the surfaces of the mesopore and used to produce highly isotactic polypropene with a unique spherulite morphology.
Adsorption of nitrogen oxides (NO, NO2) and their coadsorption with oxygen on Co2+/SiO2 samples has been investigated by IR spectroscopy with a view to elucidating the mechanism of selective catalytic reduction (SCR) of NOx with hydrocarbons. A Co2+/SiO2 sample synthesized by ion exchange is characterized by a highly…
A facile divergent synthesis of monodisperse polyphenylene dendrimers having diameters of 21–55 Å is presented. These nanoparticles have been preparedvia a [2+4]cycloaddition–deprotection sequence using an excess of tetraphenylcyclopentadienone 1a as monomer and the tetraethynylbiphenyl 2 as core. Due to the dense pac…
Benzyl aryl ether dendrimers with azobenzene central linkers undergo reversible cis/trans isomerization of the azobenzene moiety upon exposure to ultraviolet light.
The postulated intermediates in the base-free and base-assisted addition of OsO 4 to olefins have been optimized using density functional theory (DFT). Ammonia was chosen as the base and ethylene as the olefin. The corresponding transition states have been characterized fully. Further, the activation barriers have bee…
This review describes current trend in research and development of a slight degree of corrosion of stainless steel for semiconductor processing. Although organic materials such as polyvinyl chloride have been used for ultra-pure water piping in semiconductor processing, it has been pointed out that there are several p…
Simultaneous additions of Co, Al, and Zr to Nd(Dy)FeB alloys substantially improve the coercivity and corrosion resistance, and somewhat increases the Curie temperature. It was found that the microstructure of starting materials affects the final magnetic properties of the resulting sintered magnets. A cast ingot havi…
Promoted ignition and more recently promoted combustion are terms which have been used to describe a situation where a substance with low oxygen compatibility ignites and supports the combustion of a more combustion resistant material. Previous work has been reported on the investigation of this phenomenon as it relat…
A MCS (Monte Carlo simulation) method of charge accumulation based on the SEEA (secondary emission electron avalanche) mechanism is applied to the design of effective corrugation on an insulator surface used in vacuum. The electric field distribution on the cathode in the vicinity of a triple junction is analyzed taki…
Over the last several years, the International Standards Organization (ISO) has developed standards which require pneumatic impact testing on valves, regulators, and other oxygen components used in Europe in medical, industrial, and commercial applications. The several standards involved all reference a test system de…
A prototype of integrated micropermeameter has been achieved, using the batch process on silicon wafers developed for the fabrication of magnetic heads for helical scan recorders. Measuring the inductance of the integrated solenoids as a function of the frequency gives information on the effective permeability of the…
A Mn-Zn ferrite with fine grain size and low core loss at 0.5 to 2 MHz was developed, and a conductor-embedded-type planar transformer was made using the developed ferrite. The Bm/spl middot/f value in the loss level of 400 kW m/sup -3/ of the developed ferrite at f=1 MHz is 2.2 times larger than that of the commercia…
The phosphorescence decays of β-cyclodextrin (β-CD) complexes of xanthione (XT) and 4H-1-benzopyran-4-thione (BPT) show that self-quenching and oxygen quenching are not important in such complexes, and that the existence of bimodal inclusion in solid complexes can be identified using the width of the distribution para…
The protective performance against molten metal has commonly been measured for the outer layers of garments. Heavy-weight wool melton offers the best overall protection against molten metal owing to its metal-shedding property coupled with high thermal insulation. Reflective aluminized materials, which also protect ag…