- Device and method for preparing high-valence silver nanometer material with proportions of Ag+2 and Ag+3 controllable
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The invention belongs to the technical field of nanometer materials and relates to a device and method for preparing a high-valence silver nanometer material with proportions of Ag+2 and Ag+3 controllable. The device comprises a reaction raw material storage part, a reaction occurrence part and a product collection part which are connected in sequence. A segmented oxidation method is adopted, so that part of Ag+2 is oxidized into Ag+3; the length of a distributor in the reaction occurrence part is controlled, reaction time is adjusted, and thus the proportions of Ag+2 and Ag+3 can be controlled; the production process is simple, and operation is convenient. The dimension of nanometer high-valence silver prepared through the method ranges from 50 nanometers to 300 nanometers, the proportions of Ag+2 and Ag+3 approximately range from 1.5: 1 to 2: 1, and sterilization efficiency of the nanometer silver is improved by 100-200 times or above.
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Paragraph 0022
(2017/04/19)
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- Synthesis of oxazoles by silver catalysed oxidative decarboxylation-cyclization of α-oxocarboxylates and isocyanides
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A silver catalysed synthesis of oxazoles by the oxidative decarboxylation-cyclization of α-oxocarboxylates and isocyanides was developed. This method provided a novel strategy to construct oxazole rings compared to traditional methods. Mechanistic investigations such as operando IR, EPR and radical inhibition experiments were carefully done and confirmed the acyl cation and Ag(ii) as the intermediates in this transformation, and the involvement of a radical decarboxylative process.
- Ma, Yiyang,Yan, Zhiyuan,Bian, Changliang,Li, Ke,Zhang, Xiaowen,Wang, Mengfan,Gao, Xinlong,Zhang, Heng,Lei, Aiwen
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supporting information
p. 10524 - 10527
(2015/06/25)
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- Spectrophotometric studies of [bis(pyrazine)silver(II)-peroxodisulphate] and kinetics and mechanism of oxidation of water by it in aqueous perchloric acid
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Pyrazine stabilises silver(II) through formation of complex, bis(pyrazine)silver(II)-peroxodisulphate in 4.0 M perchloric acid which has been studied spectrophotometrically at λmax 460 and 619 nm and the molar absorpuvities are found to be 2100 and 2242M-1 cm-1 respectively. Ag(pyz)22+ gradually oxidises water. The effect of [H+], [pyrazine], [AgII] and temperature on the rate constants have been determined. A mechanism has been proposed for the reduction of Ag(pyz)22+ to Ag+.
- Shukla,Indrayan
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- Kinetics of the reaction of silver(II) with dithionate
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The reaction 2Ag(II) + S2O62- + 2H2O = 2Ag+ + 2HSO4- + 2H+ proceeds by a mechanism in which the oxidizing agent, silver(II), participates in the rate-determining step. This is unlike previously known reactions of dithionate with certain strong oxidizing agents, for which disproportionation or hydrolysis of dithionate has been rate determining. The dominant term in the rate law is -d[Ag(II)]/dt = k[H+][Ag(II)][S2O62-], with k = 5.5 × 10-2 M-2 sec-1 at I = 3.5 M and 25.0°.
- Veith, Gilman,Guthals, Elise,Viste, Arlen
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p. 667 - 669
(2008/10/08)
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