The presence of nanometer size particles within an evaporating water droplet, affects the heat transfer and temperature distribution within the droplet. Levitating the droplet acoustically allows the study of this phenomenon without the heat transfer interference that occurs with the use of other techniques, such as capillary suspension [1]. In addition to the heat transfer effects, the remaining particle after the water in the droplet is completely evaporated, agglomerate together to form bowl shaped and ring shaped structures. The suspended droplet was heated using a Carbon Dioxide Laser. The process has been imaged in-situ with an Infrared (IR) camera, registering the temperature profile around the droplet surface. A high speed camera simultaneously captured the formation of nanoparticle structures. The experiments were conducted for a range of 0.1% to 5% nanosilica volume concentration solutions. Scanning Electron Microscopy was performed on the remaining structures to observe the inner portion and the outer surface of the formed structures.

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