Figure 3.

OM images of nanofluids when in liquid state. (a,b,c) OM images of the nanofluids containing 13-nm alumina NPs at 0.9, 2.7, and 4.6 vol.%, respectively, and (d,e,f) OM images of the nanofluids containing 90-nm alumina NPs at 0.9, 2.7, and 4.6 vol.%, respectively.

Lu and Huang Nanoscale Research Letters 2013 8:292   doi:10.1186/1556-276X-8-292
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