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Implosive collapse of cavitation bubbles near the bulk metal surface generates powerful microjets, leading to material ejection. This liberated material is captured and stabilized by a surfactant bilayer in the form of nanoparticles. The method is characterized in detail using gold, but is also demonstrated on other metals and alloys, and is generally applicable. It is shown that nanoparticles can be produced regardless of the bulk metal form factor, and the method is extended to an environmentally important problem, the reclamation of gold from an electronic waste stream.<\/jats:p>","DOI":"10.1002\/smll.201703615","type":"journal-article","created":{"date-parts":[[2018,3,24]],"date-time":"2018-03-24T23:55:22Z","timestamp":1521935722000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Formation of Metal Nanoparticles Directly from Bulk Sources Using Ultrasound and Application to E\u2010Waste Upcycling"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8012-9837","authenticated-orcid":false,"given":"John","family":"Watt","sequence":"first","affiliation":[{"name":"Center for Integrated Nanotechnologies Sandia National Laboratories  Albuquerque NM 87185 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