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Characterization of Y2BaCuO5 nanoparticles synthesized by nano-emulsion method

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Abstract

Nanoscale yttrium–barium–copper oxide (Y2BaCuO5, Y211) particles were synthesized using the emulsion method and the solution method. The basic water-in-oil (w/o) emulsion system consisted of n-octane (continuous oil phase), cetyltrimethylammonium bromide (cationic surfactant), butanol (cosurfactant) and water. The composition of the emulsion system was varied and characterized by measuring the conductivity of the solutions and droplet size. The droplet size of emulsion was determined by using the dynamic light scattering method. The water content, cosurfactant content, and surfactant/n-octane ratio affected the droplet size which was in the range of 3–8 nm, and hence the w/o emulsion system was referred to as a nano-emulsion system. A model was used to verify the droplet size. The influence of salt (Y2(NO3)3) content on the droplet size was investigated and the addition of salt reduced the droplet size. The effects of reaction time and temperature on the Y211 particle sizes were also investigated. The particles were characterized using the TEM, SEM, and XRD. Nanoparticles produced by the nano-emulsion method were calcined at 850°C to form the Y211 phase as compared to solid state processing temperature of 1050°C. Based on the TEM analysis, the average diameter of the Y211 particles produced using the nano-emulsion method was in the range of 30–100 nm. The effect of adding 15% Y211 nanoparticles to the superconductor YBCO-123 as flux pinning centers, was investigated, and the transition temperature was reduced by 3 K.

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Acknowledgements

The author would like to thank Dr. M.K. Mironova for helping with the TEM work and related discussion. This work was supported by a grant from the Texas Center for Superconductivity and Advanced Materials (TCSAM) at University of Houston, Houston, Texas.

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  1. Texas Center for Superconductivity and Advanced Materials (TcSAM) and College of Engineering, University of Houston, Houston, TX, 77204-4003, USA

    Fang Li & Cumaraswamy Vipulanandan

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  1. Fang Li
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  2. Cumaraswamy Vipulanandan
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Correspondence to Cumaraswamy Vipulanandan.

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Li, F., Vipulanandan, C. Characterization of Y2BaCuO5 nanoparticles synthesized by nano-emulsion method. J Nanopart Res 9, 841–852 (2007). https://doi.org/10.1007/s11051-006-9144-z

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  • DOI: https://doi.org/10.1007/s11051-006-9144-z

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