Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems
The generation of cavitation-free radicals through evanescent electric field and bulk-streaming was reported when micro-volumes of a liquid were subjected to 10 MHz surface acoustic waves (SAW) on a piezoelectric substrate [Rezk et al., J. Phys. Chem. Lett. 2020, 11, 4655–4661; Rezk et al., Adv. Sci...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-05-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417721000341 |
| _version_ | 1819295023357755392 |
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| author | Joydip Mondal Wu Li Amgad R. Rezk Leslie Y. Yeo Rajaram Lakkaraju Parthasarathi Ghosh Muthupandian Ashokkumar |
| author_facet | Joydip Mondal Wu Li Amgad R. Rezk Leslie Y. Yeo Rajaram Lakkaraju Parthasarathi Ghosh Muthupandian Ashokkumar |
| author_sort | Joydip Mondal |
| collection | DOAJ |
| description | The generation of cavitation-free radicals through evanescent electric field and bulk-streaming was reported when micro-volumes of a liquid were subjected to 10 MHz surface acoustic waves (SAW) on a piezoelectric substrate [Rezk et al., J. Phys. Chem. Lett. 2020, 11, 4655–4661; Rezk et al., Adv. Sci. 2021, 8, 2001983]. In the current study, we have tested a similar hypothesis with PZT-based ultrasonic units (760 kHz and 2 MHz) with varying dissolved gas concentrations, by sonochemiluminescence measurement and iodide dosimetry, to correlate radical generation with dissolved gas concentrations. The dissolved gas concentration was adjusted by controlling the over-head gas pressure. Our study reveals that there is a strong correlation between sonochemical activity and dissolved gas concentration, with negligible sonochemical activity at near-vacuum conditions. We therefore conclude that radical generation is dominated by acoustic cavitation in conventional PZT-based ultrasonic reactors, regardless of the excitation frequency. |
| first_indexed | 2024-12-24T04:35:37Z |
| format | Article |
| id | doaj.art-3f30c4f010684d90aae734ba2e400668 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-12-24T04:35:37Z |
| publishDate | 2021-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-3f30c4f010684d90aae734ba2e4006682022-12-21T17:15:12ZengElsevierUltrasonics Sonochemistry1350-41772021-05-0173105493Acoustic cavitation at low gas pressures in PZT-based ultrasonic systemsJoydip Mondal0Wu Li1Amgad R. Rezk2Leslie Y. Yeo3Rajaram Lakkaraju4Parthasarathi Ghosh5Muthupandian Ashokkumar6School of Chemistry, The University of Melbourne, VIC 3010, Australia; Cryogenic Engineering Centre, IIT Kharagpur, Kharagpur 721302, IndiaSchool of Chemistry, The University of Melbourne, VIC 3010, AustraliaMicro/Nanophysics Research Laboratory, School of Engineering, RMIT University, Melbourne, VIC 3000, AustraliaMicro/Nanophysics Research Laboratory, School of Engineering, RMIT University, Melbourne, VIC 3000, AustraliaDepartment of Mechanical Engineering, IIT Kharagpur, Kharagpur 721302, IndiaCryogenic Engineering Centre, IIT Kharagpur, Kharagpur 721302, India; Corresponding authors.School of Chemistry, The University of Melbourne, VIC 3010, Australia; Corresponding authors.The generation of cavitation-free radicals through evanescent electric field and bulk-streaming was reported when micro-volumes of a liquid were subjected to 10 MHz surface acoustic waves (SAW) on a piezoelectric substrate [Rezk et al., J. Phys. Chem. Lett. 2020, 11, 4655–4661; Rezk et al., Adv. Sci. 2021, 8, 2001983]. In the current study, we have tested a similar hypothesis with PZT-based ultrasonic units (760 kHz and 2 MHz) with varying dissolved gas concentrations, by sonochemiluminescence measurement and iodide dosimetry, to correlate radical generation with dissolved gas concentrations. The dissolved gas concentration was adjusted by controlling the over-head gas pressure. Our study reveals that there is a strong correlation between sonochemical activity and dissolved gas concentration, with negligible sonochemical activity at near-vacuum conditions. We therefore conclude that radical generation is dominated by acoustic cavitation in conventional PZT-based ultrasonic reactors, regardless of the excitation frequency.http://www.sciencedirect.com/science/article/pii/S1350417721000341Sonochemical activityAcoustic cavitationCavitation-free radical generationCavitation bubbles |
| spellingShingle | Joydip Mondal Wu Li Amgad R. Rezk Leslie Y. Yeo Rajaram Lakkaraju Parthasarathi Ghosh Muthupandian Ashokkumar Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems Ultrasonics Sonochemistry Sonochemical activity Acoustic cavitation Cavitation-free radical generation Cavitation bubbles |
| title | Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems |
| title_full | Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems |
| title_fullStr | Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems |
| title_full_unstemmed | Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems |
| title_short | Acoustic cavitation at low gas pressures in PZT-based ultrasonic systems |
| title_sort | acoustic cavitation at low gas pressures in pzt based ultrasonic systems |
| topic | Sonochemical activity Acoustic cavitation Cavitation-free radical generation Cavitation bubbles |
| url | http://www.sciencedirect.com/science/article/pii/S1350417721000341 |
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