There are plenty of stabilization techniques, mainly using a surfactant, or functional group to generate repulsive forces to counteract the Wan der Waal attraction forces.
This article outline the basic methods in a straight forward way:
Article Stability of nanofluid: A review
Nanoparticles tend to form agglomerated zones naturally. The main reason is their high surface to volume ratio and presence of strong Wan der Waal forces. It would be better if you could state the material of the powder you have referred to in your question. Generally, surface modifications, using acid stearic and ultrasonic vibration are possible solutions for avoiding and breaking nanoparticles agglomeration. Take a look at the paper below, if your work is somehow related to the powder metallurgy technique:
Article Warm dynamic compaction of Al6061/SiC nanocomposite powders
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