Characteristic stability of bare Au-water nanofluids fabricated by pulsed laser ablation in liquids
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- Characteristic stability of bare Au-water nanofluids fabricated by pulsed laser ablation in liquids
- Kim, H.J.; Bang, In Cheol; Onoe, J.
- Gold nanoparticles; Isoelectric point; Nanofluids; Pulsed laser ablation in liquids; Stability; Surface charge
- Issue Date
- ELSEVIER SCI LTD
- OPTICS AND LASERS IN ENGINEERING, v.47, no.5, pp.532 - 538
- 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 18 h, 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.
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