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http://dx.doi.org/10.1016/j.net.2015.06.007

INTERPARTICLE POTENTIAL OF 10 NANOMETER TITANIUM NANOPARTICLES IN LIQUID SODIUM: THEORETICAL APPROACH  

KIM, SOO JAE (Department of Mechanical Engineering, POSTECH)
PARK, GUNYEOP (Department of Mechanical Engineering, POSTECH)
PARK, HYUN SUN (Division of Advanced Nuclear Engineering, POSTECH)
KIM, MOO HWAN (Korea Institute of Nuclear Safety)
BAEK, JEHYUN (Department of Mechanical Engineering, POSTECH)
Publication Information
Nuclear Engineering and Technology / v.47, no.6, 2015 , pp. 662-668 More about this Journal
Abstract
A suspension of titanium nanoparticles (Ti NPs) in liquid sodium (Na) has been proposed as a method to mitigate the violent sodium-water reaction (SWR). The interparticle potential between Ti NPs in liquid Na may play a significant role in the agglomeration of NPs on the reaction surface and in the bulk liquid Na, since the potential contributes to a reduction in the long-term dispersion stability. For the effective control of the SWR with NPs, a physical understanding of the molecular dynamics of NPs in liquid Na is key. Therefore in this study, the nonretarded Van der Waals model and the solvation potential model are employed to analyze the interparticle potential. The ab initio calculation reveals that a strong repulsive force driven by the solvation potential exceeds the interparticle attraction and predicts the agglomeration energy required for two 10-nm Ti NPs to be $4{\times}10^{-17}J$. The collision theory suggests that Ti NPs can be effective suppressors of the SWR due to the high energy barrier that prevents significant agglomeration of Ti NPs in quiescent liquid Na.
Keywords
Ab initio calculation; Liquid sodium; Sodium-water reaction; Solvation potential; Titanium Nanoparticle; Van der Waals forces;
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