Citation: XU Wen-Li, CHEN Qing-De, SHEN Xing-Hai. Synthesis of BaSO₄ Nanofibers Controlled by the Yield of Hydrated Electrons in AOT-Based Microemulsions[J]. Acta Physico-Chimica Sinica, ;2014, 30(6): 1194-1200. doi: 10.3866/PKU.WHXB201404291 shu

Synthesis of BaSO₄ Nanofibers Controlled by the Yield of Hydrated Electrons in AOT-Based Microemulsions

1.
Beijing National Laboratory for Molecular Sciences, Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 28 March 2014
Available Online: 29 April 2014
Fund Project:

Single-crystal BaSO₄ nanofibers and multi-architecture bundles were successfully synthesized in sodium bis(2-ethylhexyl) sulfosuccinate (AOT)-based microemulsions containing K₂S₂O₈ and BaCl₂, in which the controlled release of SO₄^2-ions was realized in situ by the radiolytic reduction of S₂O₈^2-ions. The molar ratio of water to surfactant (ω values), the counterions of Ba²⁺, and the addition of aromatic compounds into the oil phase of the microemulsions were used to adjust the yield of hydrated electrons (e_aq^-). This allowed for controlling the reduction of S₂O₈^2- ions and the release of SO₄^2- ions, leading to the shape manipulation of BaSO₄ nanoparticle. With an increase in ω values or dose rate, the yield of e_aq^- increased, which led to a quicker release of SO₄^2- ions, and this did not favor the formation of BaSO₄ nanofibers. When BaCl₂ was replaced with Ba(NO₃)₂ the formation of nanofilaments became possible at a higher dose rate and a higher ω value, because NO₃-effectively decreased the yield of e_aq^- and the rate of S₂O₈^2- ion reduction. When toluene was added into the oil phase of the microemulsions, the excess electrons were effectively scavenged in the oil phase, and the concentration of e_aq^- in the water pool decreased. This favored the formation of nanofibers at higher dose rates. These results showed that the mechanism about morphology control by the yield of e_aq^- was verified in the syntheses of BaSO₄ nanoparticle.
- BaSO₄,
- γ-Irradiation,
- Hydrated electron,
- Reverse microemulsion,
- Nanofiber
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis of BaSO4 Nanofibers Controlled by the Yield of Hydrated Electrons in AOT-Based Microemulsions

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通讯作者: 陈斌, bchen63@163.com

Synthesis of BaSO₄ Nanofibers Controlled by the Yield of Hydrated Electrons in AOT-Based Microemulsions