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Synthesis of mono-dispersed nanofluids using solution plasma.

Authors
  • Heo, Yong Kang1
  • Bratescu, Maria Antoaneta
  • Ueno, Tomonaga
  • Saito, Nagahiro
  • 1 Graduate School of Materials Engineering, Nagoya University , Furo-cho, Chikusa-ku, Nagoya, Japan. , (Japan)
Type
Published Article
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Publication Date
Jul 14, 2014
Volume
116
Issue
2
Pages
24302–24302
Identifiers
PMID: 25114332
Source
Medline
Language
English
License
Unknown

Abstract

Small-sized and well-dispersed gold nanoparticles (NPs) for nanofluidics have been synthesized by electrical discharge in liquid environment using termed solution plasma processing (SPP). Electrons and the hydrogen radicals are reducing the gold ions to the neutral form in plasma gas phase and liquid phase, respectively. The gold NPs have the smallest diameter of 4.9 nm when the solution temperature was kept at 20 °C. Nucleation and growth theory describe the evolution of the NP diameter right after the reduction reaction in function of the system temperature, NP surface energy, dispersion energy barrier, and nucleation rate. Negative charges on the NPs surface during and after SPP generate repulsive forces among the NPs avoiding their agglomeration in solution. Increasing the average energy in the SPP determines a decrease of the zeta potential and an increase of the NPs diameter. An important enhancement of the thermal conductivity of 9.4% was measured for the synthesized nanofluids containing NPs with the smallest size.

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