Figure 6.

SEM micrographs of nanofluids based on NaNO3-KNO3 with 0.5 wt.% (a,b,c,d), 1.0 wt.% (e,f,g,h), and 1.5 wt% (i,j,k,l) of nanoparticles. silica (a,e,i), alumina (b,f,j), titania (c,g,k) and alumina-silica nanoparticles (d,h,l).

Chieruzzi et al. Nanoscale Research Letters 2013 8:448   doi:10.1186/1556-276X-8-448
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