Details

Autor(en) / Beteiligte

• Xu, Shanshan
• Chang, Nan
• Wang, Rui
• Liu, Xiaodong
• Guo, Shifang
• Wang, Supin
• Zong, Yujin
• Wan, Mingxi

Titel

Acoustic droplet vaporization and inertial cavitation thresholds and efficiencies of nanodroplets emulsions inside the focused region using a dual-frequency ring focused ultrasound

Ist Teil von

• Ultrasonics sonochemistry, 2018-11, Vol.48, p.532-537

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Effect of dual frequency US on nanodroplet vaporization threshold was studied.•Effect of dual frequency US on nanodroplet vaporization area was studied.•Effect of dual frequency US on vaporized microbubbles IC threshold was studied.•Effect of dual frequency US on vaporized microbubbles IC area was studied.•Effect of dual frequency US on efficiency of ADV and IC was studied. In this work, in order to develop a low-acoustic-intensity, high-efficiency and precise-treatment strategy, the vaporization of droplets and the inertial cavitation of vaporized microbubbles, using a dual-frequency focused ultrasound transducer, were investigated. The effect of a low frequency (LF), 1.1-MHz, sonication on droplet vaporization and the following inertial cavitation by the introduction of a high frequency (HF), 5-MHz, sonication was studied. It is shown that acoustic droplet vaporization (ADV) threshold is the lowest at dual-frequency sonication (LF of 18.9 W/cm2 and HF of 4.1 W/cm2); moreover, the ADV efficiency is the highest at intensity threshold. The ADV area can be minimized to 2 mm2 using a dual-frequency sonication (LF of 38.1 W/cm2 and HF of 8.5 W/cm2). The IC area and efficiency can also be modulated using a dual-frequency sonication. Consequently, it can be concluded that in contrast to the single-frequency sonication, using the dual-frequency ultrasound, the vaporization of nanodroplets and the following inertial cavitation of the vaporized microbubbles can be modulated. Besides, a dual-frequency can result in the minimum ADV/IC area, lowest ADV/IC threshold, and highest ADV/IC efficiency.