- A novel route for the preparation of monodisperse silver nanoparticles via a pulsed sonoelectrochemical technique
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Monodisperse silver nanoparticles stabilized with PVP have been prepared in a saturated solution of silver citrate (Ag3C6H 5O7) in the presence of poly(vinyl pyrrolidone) (PVP) by a pulsed sonoelectrochemical technique.
- Jiang, Li-Ping,Wang, An-Ning,Zhao, Yu,Zhang, Jian-Rong,Zhu, Jun-Jie
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- Enhanced photocatalytic properties of a novel GO-Ag-C6H5Ag3O7 nanocomposite
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A novel graphene oxide-Ag-C6H5Ag3O7 nanocomposite was prepared by a facile precipitation reaction with the aid of photo-reduction. The rich surface functional groups of graphene oxide (GO) interacted with silver cations, provided the nucleation sites and induced the formation of C6H5Ag3O7 nanoparticles on the GO surface uniformly. The nanocomposite displayed an enhanced photocatalytic activity compared with pure C6H5Ag3O7 and GO under simulated sunlight, due to the reduced recombination of plasmon-induced electron-hole pairs on the Ag nanoparticles by the GO. This study likely provides one possibility of exploiting stable Ag/silver (I) complex photocatalysts in dealing with environmental contaminants.
- Liu, Fenglin,Chen, Xianjie,Tian, Lihong,Liu, Bing,Xia, Qinghua,Chen, Xiaobo
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- Mechanochemical and solution synthesis, and crystal structures and IR and solid-state (CPMAS) NMR spectroscopy of some bis(triphenylphosphine)silver(i) mono- and di-hydrogencitrate systems
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The complex [(Ph3P)2Ag(H2cit)]·EtOH (1; H2cit- = dihydrogencitrate = C6H 7O7-) contains [(Ph3P) 2Ag(H2cit)] molecules in which the silver atom is coordinated to two PPh3 molecules and the two oxygen atoms of one of the 'terminal'/1-carboxylate groups of the dihydrogencitrate group. The molecules form centrosymmetric hydrogen-bonded dimers in the solid. In [{(Ph3P)2Ag}2(Hcit)], (2), unsymmetrical deprotonation of the citrate grouping is found, from the 1- and 3- (i.e. terminal and central) carboxylates: [(Ph3P)2Ag(O 2CCH2C(OH) (CH2COOH)CO2)Ag(PPh 3)2]. The above complexes, as well as [(Ph 3P)3Ag(H2cit)] (3) were prepared via conventional solution methods, involving the reaction of trisilver(i) citrate, citric acid and triphenylphosphine, and by a mechanochemical method involving the reaction of silver(i) oxide, citric acid and triphenylphosphine. IR studies of 1-3 show the presence of coordinated carboxylate and free carboxylic acid groups in the mono- and di-hydrogencitrate ligands, and the formation of 2 from 1 shows that dihydrogencitrate deprotonation can occur upon dissolution of 1 in protic solvents. High-field (9.40 T) 31P CPMAS NMR spectra were recorded and analysed, yielding heteronuclear 1J( 107/109Ag,31P) and homonuclear 2J( 31P,31P) spin-spin coupling constants.
- Bowmaker, Graham A.,Hanna, John V.,Skelton, Brian W.,White, Allan H.
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p. 5409 - 5417
(2012/05/20)
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- ANTIMICROBIAL SILVER SOLUTIONS
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A method for preparing a concentrated solution containing water, citrate ions and silver ions, including providing an amount of trisilver citrate, providing an amount of citric acid, wherein the amount of the citric acid is at least 19 times the amount of the trisilver citrate by weight, and mixing the trisilver citrate and the citric acid in an amount of water to produce the concentrated solution, wherein the amount of water is selected so that the concentrated solution has a citrate ion concentration which is at least 300 grams per liter. A concentrated solution containing water, citrate ions and silver ions, wherein the concentrated solution has a silver ion concentration which is at least 10 grams per liter. A diluted solution prepared by adding water to a concentrated solution containing water, citrate ions and silver ions.
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Page/Page column 9
(2010/03/04)
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