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Title: Synthesis of mono-dispersed nanofluids using solution plasma

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.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [2] ;  [1] ;  [2] ;  [2] ;  [2]
  1. Graduate School of Materials Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
22308974
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AGGLOMERATION; CRYSTAL GROWTH; ELECTRIC DISCHARGES; GOLD; GOLD IONS; HYDROGEN; NANOFLUIDS; NANOPARTICLES; PLASMA; SURFACE ENERGY; SURFACES; SYNTHESIS; THERMAL CONDUCTIVITY