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Muhammad Ismail Popular answer

Centrifuge your particles and then re-dispersed in absolute ethanol or hexane

Dr. Anand Lodha

You can kept your particles in normal fridge in airtight container (after centrifuge). I think it is enough for you to stabilize the AgNps for weeks to months.

Muhammad Ismail

Titus Sobisch

maybe in case of ethanol, but surely in hexane particles stabilized by biomolecules will flocculate.

Prakash Rana

How to produce Ag nano particle of 40 nm?