Shear thickening happens for high filler concentrations and "odd shaped" particles, i.e. particles that have a rough surface that can connect to each other easily.

Therefore, I would suggest you to check the shape of your particles e.g. by SEM and increase the concentration in the STF

Hello Nitin Kumar

Yes, STFs can be prepared from the synthesised silica nanoparticles.

I hope you are refering 'standard STF viscosity profile' to the steep rise in viscosity at a certain value of shear rate. If yes, probably the solid content is lower. With silica and PEG, solid content of about or above 65% shows visible shear thickening.

Other possible solutions, if the STF is properly prepared.

# Try adjusting the gap between the plates (or cone and plate) of the rheometer.

# Check the temperature of the plates. Too hot a setting may not reveal the expected profile.

# Make sure the STF does not absorb moisture upon storage.

# Use preshear before the actual rheology test.

Otherwise, ensure proper dispersion through optimum sonication.

Hope this helps.

Hi Nitin Kumar ,

The above answers will adjust the shear thickening nature of the mixture, but it may be best to check your viscosity test method as well. When the sample thickens a lot and you force it to move still it will tend to fracture from the gap and you get incorrect measurements. An alternative way is to run a stress ramp test instead of a shear rate ramp test, as this should keep the sample in situ.

Best

Phil

Thank you all...i will try this

i know some novel ideas on shear thickening fluid. i would like to share it with you.

please email me.

email: [email protected]

Surely, Nitin you can prepare shear thickening fluids from Silica nanoparticles. You can refer to the following documents: Hope these help

DOI: 10.1088/2053-1591/ab1185

DOI: 10.3311/PPch.13626

Also Prof. Abhijit Majumdar, Department of Textile Technology, IIT Delhi, has a number of published articles on this. Since you are from the same Institute, maybe you can refer to his work.