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Non Newtonian Fluid


I am working on non-Newtonian fluid project. I have experimented with cornstarch and water and achieved the consistency desired with 55% cornstarch and 45% water.

Now I want to create similar outcome using Silica Nano particles and Polyethylene glycol (PEG 400). However I am not able to reach a proper result. I used the following ratio:  60:40 (polyethylene and silica) But I got a paste-like material instead of a shear thickening fluid.
And ideas on how to find an accurate ratio for desired result? Is the problem regarding the ratio or the mixing steps? Do I need specific equipment for the process?
Thank you. 

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