Inertial cavitation initiated by polytetrafluoroethylene nanoparticles under pulsed ultrasound stimulation

	Inertial cavitation initiated by polytetrafluoroethylene nanoparticles under pulsed ultrasound stimulation
	Jin, Qiaofeng; Kang, Shih-Tsung; Chang, Yuan-Chih; Zheng, Hairong; Yeh, Chih-Kuang
刊名	ULTRASONICS SONOCHEMISTRY
	2016
英文摘要	Nanoscale gas bubbles residing on a macroscale hydrophobic surface have a surprising long lifetime (on the order of days) and can serve as cavitation nuclei for initiating inertial cavitation (IC). Whether interfacial nanobubbles (NBs) reside on the infinite surface of a hydrophobic nanoparticle (NP) and could serve as cavitation nuclei is unknown, but this would be very meaningful for the development of sonosensitive NPs. To address this problem, we investigated the IC activity of polytetrafluoroethylene (PTFE) NPs, which are regarded as benchmark superhydrophobic NPs due to their low surface energy caused by the presence of fluorocarbon. Both a passive cavitation detection system and terephthalic dosimetry was applied to quantify the intensity of IC. The IC intensities of the suspension with PTFE NPs were 10.30 and 48.41 times stronger than those of deionized water for peak negative pressures of 2 and 5 MPa, respectively. However, the IC activities were nearly completely inhibited when the suspension was degassed or ethanol was used to suspend PTFE NPs, and they were recovered when suspended in saturated water, which may indicates the presence of interfacial NBs on PTFE NPs surfaces. Importantly, these PTFE NPs could sustainably initiate IC for excitation by a sequence of at least 6000 pulses, whereas lipid microbubbles were completely depleted after the application of no more than 50 pulses under the same conditions. The terephthalic dosimetry has shown that much higher hydroxyl yields were achieved when PTFE NPs were present as cavitation nuclei when using ultrasound parameters that otherwise did not produce significant amounts of free radicals. These results show that superhydrophobic NPs may be an outstanding candidate for use in IC-related applications.
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1350417716300505
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/10463]
专题	深圳先进技术研究院_医工所
作者单位	ULTRASONICS SONOCHEMISTRY
推荐引用方式 GB/T 7714	Jin, Qiaofeng,Kang, Shih-Tsung,Chang, Yuan-Chih,et al. Inertial cavitation initiated by polytetrafluoroethylene nanoparticles under pulsed ultrasound stimulation[J]. ULTRASONICS SONOCHEMISTRY,2016.
APA	Jin, Qiaofeng,Kang, Shih-Tsung,Chang, Yuan-Chih,Zheng, Hairong,&Yeh, Chih-Kuang.(2016).Inertial cavitation initiated by polytetrafluoroethylene nanoparticles under pulsed ultrasound stimulation.ULTRASONICS SONOCHEMISTRY.
MLA	Jin, Qiaofeng,et al."Inertial cavitation initiated by polytetrafluoroethylene nanoparticles under pulsed ultrasound stimulation".ULTRASONICS SONOCHEMISTRY (2016).