Ultrasonication increases the vibration over the agglomerated solid particles.  Through which the loosely bound solid particles will be separated.  Which can be analysed by SEM or TEM.

Ultrasonic cavitation improves the material transfer at particle surfaces. This effect can be used to improve surface functionalization of materials having a high specific surface area. When exposing liquids to ultrasound the sound waves that propagate into the liquid result in alternating high-pressure and low-pressure cycles. This applies mechanical stress on the attracting forces between the individual particles. Ultrasonic cavitation in liquids causes high speed liquid jets of up to 1000km/hr. Such jets press liquid at high pressure between the particles and separate them from each other. Smaller particles are accelerated with the liquid jets and collide at high speeds.

Vibration increased without temperature increase.