You can make graphene nanofluids with various liquids. When you ask "the best liquid" for what? nanofluids stability? Dispersion? Thermal enhancement?
i think you have to ask for what application you want to used nano fluids?! And then choose the fluid appropriate for that application.
As you know graphene or(graphene oxide) is polar so the fluid must be polar too to dispesion
but in process industries we are dealing with equipments that polar liquids are dangerous for them(corrosion)
so im trying to find a way to produce nonpolar graphene(or graphene oxide) and find a nonpolar fluid to disperse in it
For heat transfer applications is normally used a ethylene glicol liquid (polar liquid) or a mixture of EG with water, and there are no significante corrosion in the pipes or in other componentes. If you are trying to disolve the graphene in a non polar liquid you will never get a stable nanofluid, the nanoparticles will setle.
If u r using 2 step method for the preparation of nanofluids.... the selection of base fluid is very important which depend on the application.... most of the previous studies have used DI water as base-fluid but there are some studies available for Ethylene glycol and water mixture (Ratio 60:40)
The main concern is the stability of your nanofluid... I am not sure how graphene or graphene oxide will behave in such conditions but you can use mechanical mixing or suitable surfactant as well (depending on zeta potential) to make it more stable
I have ever noticed that researchers added SDS with mass concentration of 200 ppm to graphene nanofluid and demonstrated relatively better stability. You could have a try.
Hi,Amir,could you give me a detailed explaination that why graphene is polar? From my point of view, graphene is sheet in nanoscale with highly symmetrical structure,which colud illustrate its nonpolar structure.Thanks a lot.
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