Journal
OPTICS AND LASERS IN ENGINEERING
Volume 47, Issue 5, Pages 532-538Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2008.10.011
Keywords
Pulsed laser ablation in liquids; Gold nanoparticles; Nanofluids; Stability; Surface charge; Isoelectric point
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Funding
- MEXT's
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Gold nanoparticles (Au-NPs) suspended in water where the suspension is a kind of nanofluid, were produced by pulsed laser ablation in liquids. Under the laser irradiation conditions up to 18h, the average size of the Au-NPs ranged from 7.1 to 12.1 nm while their size-distribution tended to become narrower with effects of laser-induced fragmentation. Interestingly, the nanofluid showed an outstanding colloidal stability even after 1 month although no dispersants were used. The characteristic stability of bare Au-NPs suspension in water was found to be due to a large negative zeta potential of Au-NPs in water. The thermal conductivity of the Au-NPs (0.018 vol%)/water suspension increased by 9.3 +/- 5.4% compared to that of pure water. (C) 2008 Elsevier Ltd. All rights reserved.
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