- Thermal decomposition process of silver behenate
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The thermal decomposition processes of silver behenate have been studied by infrared spectroscopy (IR), X-ray diffraction (XRD), combined thermogravimetry-differential thermal analysis-mass spectrometry (TG-DTA-MS), transmission electron microscopy (TEM) and UV-vis spectroscopy. The TG-DTA and the higher temperature IR and XRD measurements indicated that complicated structural changes took place while heating silver behenate, but there were two distinct thermal transitions. During the first transition at 138 °C, the alkyl chains of silver behenate were transformed from an ordered into a disordered state. During the second transition at about 231 °C, a structural change took place for silver behenate, which was the decomposition of silver behenate. The major products of the thermal decomposition of silver behenate were metallic silver and behenic acid. Upon heating up to 500 °C, the final product of the thermal decomposition was metallic silver. The combined TG-MS analysis showed that the gas products of the thermal decomposition of silver behenate were carbon dioxide, water, hydrogen, acetylene and some small molecule alkenes. TEM and UV-vis spectroscopy were used to investigate the process of the formation and growth of metallic silver nanoparticles.
- Liu, Xianhao,Lu, Shuxia,Zhang, Jingchang,Cao, Weiliang
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- Hydroformylation of alkenes catalyzed by new dinuclear aryloxide- and carboxylate-bridged rhodium complexes
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The new dinuclear aryloxide- and carboxylate-bridged rhodium complexes bis[μ-(2-methylphenolato)]bis[(η2:η2-cycloocta- 1,5-diene)rhodium], di(μ-docosanoato)bis[(η2: η2-norborna-2,5-diene)rhodium] and bis[(μ-(adamant-1-yl) carboxylato]bis[(η2:η2-norborna-2,5-diene)rhodium] have been prepared. The complexes were tested as catalysts in the hydroformylation of styrene with a total pressure of CO/H2 (1:1) of 1000 psi, at 25 and 60°C, and displayed a regioselectivity towards the branched aldehyde of up to 97%. The same complexes as catalysts in the hydroformylation of 1-octene displayed a regioselectivity for the linear aldehyde of up to 55%.
- Kostas, Ioannis D.,Vallianatou, Kalliopi A.,Kyritsis, Panayotis,Zedník, Ji?í,Vohlídal, Ji?í
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p. 3084 - 3088
(2008/10/09)
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- Photothermographic recording material coatable from an aqueous medium
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A process for producing an aqueous dispersion I containing particles including a substantially light-insensitive organic heavy metal salt A with a solubility in 100mL of water of less than 10-3g at 20°C comprising the steps of: (i) producing an aqueous dispersion II containing particles including a salt B with a solubility in 100mL of water between 1.5g and 0.001g at 20°C; and (ii) converting the salt B in the particles of the aqueous dispersion II into the organic heavy metal salt A, characterized in that the organic heavy metal salt A and the salt B have a common cation; and a production process for thermographic and photothermographic materials therewith.
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- RELATION ENTRE STRUCTURE ET REACTIVITE DES SELS D'ARGENT DANS DES FILMS DE LANGMUIR-BLODGETT
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L.B.Films are highly oriented assemblies of organic molecules.An example of their reactivity is given here in the chemistry of silver.Distorsions in the structure of the matrix take place within the reactions.The silver clusters are characterized by electron microscopy, electron diffraction and visible absorption spectra.
- Leloup, J.,Maire, P.,Ruaudel-Teixier, A.,Barraud, A.
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p. 695 - 700
(2007/10/02)
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- Process for producing heat developable light-sensitive compositions and elements
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In a process for producing thermally developable light-sensitive composition which comprises heating a composition containing (a) an organic silver salt and (b) a light-sensitive silver halide, the improvement wherein the heating is conducted in the presence of (c) a sulfur-containing compound.
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