Figure 5.

Damping factor (tg δ). As a function of frequency at 1% strain for various concentrations of EG/Fe2O3 nanofluids: empty circle, 5 wt.%; empty inverted triangle, 10 wt.%; empty square, 15 wt.%; empty diamond, 20 wt.%; and empty triangle, 25 wt.%. The inset shows maximum damping factor as a function of the weight concentration of nanofluids.

Pastoriza-Gallego et al. Nanoscale Research Letters 2011 6:560   doi:10.1186/1556-276X-6-560
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