Synthesis of hollow metallic particles via ultrasonic treatment of a metal emulsion

摘要

We introduce a synthesis method in which liquid metals in an emulsion mix and solidify under the influence of ultrasound radiation. We use it to produce two types of metallic nano- and microparticles. The first group, formed by rapid droplet solidifica-tion, is characterized by a nearly perfect spherical shape. The second group consists of hollow particles which were probably formed by near-adiabatic cooling of the metal inside an expanding cavitation bubble.