Reversible Size Control of Liquid‐Metal Nanoparticles under Ultrasonication. Issue 43 (31st August 2015)

• Record Type: Journal Article
• Authors: Yamaguchi, Akihisa; Mashima, Yu; Iyoda, Tomokazu
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 43(2015)
• Page Start: 12809
• Page End: 12813
• Publication Date: 2015-08-31
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201506469
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>This paper describes the reversible control of the size of liquid‐metal nanoparticles under ultrasonication. Gallium was utilized as a liquid metal, which has a melting point of 29.8 °C. Investigating the effects of ultrasonication (power, time, and temperature) on the formation of gallium nanoparticles revealed that the process is similar to the formation of oil in water (O/W) or water in oil (W/O) emulsions, as the temperature significantly affects the size of the gallium nanoparticles (GaNPs). Under ultrasonication, the balance between the break‐up and coalescence of the GaNPs can be adjusted by changing the temperature or adding acid through modulating the natural surface oxide layer (which can be removed with acid) and the stabilizing effect of the surfactant dodecanethiol. Coalescence was predominant at higher temperatures, whereas particle break‐up was found to be predominant at lower temperatures. Furthermore, the change in size was accompanied by a shift in the plasmonic absorption of the GaNPs in the UV region.</p> </abstract>