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Nanobrook Omni測量應用案例-99

發布時間:2019-04-18  點擊次數:79  新聞來源:
 

文獻名:Synthesis and Concentration of Organosols of Silver Nanoparticles Stabilized by AOT: Emulsion Versus Microemulsion

 

作者:Alexander I. Bulavchenko, Aida T. Arymbaeva, Marina G. Demidova, Pavel S. Popovetskiy*, Pavel E. Plyusnin, and Olga A. Bulavchenko

Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia

Boreskov Institute of Catalysis SB RAS, 5 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia

 

 

摘要:In this work, we tried to combine the advantages of microemulsion and emulsion synthesis to obtain stable concentrated organosols of Ag nanoparticles, promising liquid-phase materials. Starting reagents were successively introduced into a micellar solution of sodium bis-(2-ethylhexyl)sulfosuccinate (AOT) in n-decane in the dynamic reverse emulsion mode. During the contact of the phases, Ag+ passes into micelles and Na+ passes into emulsion microdroplets through the cation exchange AOTNaOrg + AgNO3Aq = AOTAgOrg + NaNO3Aq. High concentrations of NaNO3 and hydrazine in the microdroplets favor an osmotic outflow of water from the micelles, which reduces their polar cavities to 2 nm. As a result, silver ions are contained in the micelles, and the reducing agent is present mostly in emulsion microdroplets. The reagents interact in the polar cavities of micelles to form 7 nm Ag nanoparticles. The produced nanoparticles are positively charged, which permitted their electrophoretic concentration to obtain liquid concentrates (up to 30% Ag) and a solid AgAOT composite (up to 75% Ag). Their treatment at 250 °C leads to the formation of conductive films (180 mOhm per square). The developed technique makes it possible to increase the productivity of the process by 30 times and opens up new avenues of practical application for the well-studied microemulsion synthesis.

 
 
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