Nanotechnology is the understanding and control of matter at dimensions between approximately 1 and 100 nanometers, where unique phenomena enable novel applications
The metallic nanofluid is a suspension of monocular metallic nanoparticles in the base fluid to enhance the heat transfer of the base fluid properties. Choi 2001 present first measurement of the thermal conductivity of nanofluid. The enhancement of thermal conductivity for metallic and other nanoparticles suspended in the base fluid but they didnot mentioned the bad effect of the nano particles or nano fluid.
Toxic effects of nanoparticles and nanomaterials: Implications for public health, risk assessment and the public perception of nanotechnology
I think that the little information about the nano technology will effect on the health of the researchers so they have to get more information about it.