Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency
An ultrasonic microreactor with rough microchannels is presented in this study for oil-in-water (O/W) emulsion generation. Previous accounts have shown that surface pits or imperfections localize and enhance cavitation activity. In this study cavitation bubbles are localized on the rough microchanne...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Ultrasonics Sonochemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1350417723000354 |
| _version_ | 1797867673815613440 |
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| author | Aniket Pradip Udepurkar Christian Clasen Simon Kuhn |
| author_facet | Aniket Pradip Udepurkar Christian Clasen Simon Kuhn |
| author_sort | Aniket Pradip Udepurkar |
| collection | DOAJ |
| description | An ultrasonic microreactor with rough microchannels is presented in this study for oil-in-water (O/W) emulsion generation. Previous accounts have shown that surface pits or imperfections localize and enhance cavitation activity. In this study cavitation bubbles are localized on the rough microchannels of a borosilicate glass microreactor. The cavitation bubbles in the microchannel are primarily responsible for emulsification in the ultrasonic microreactor. We investigate the emulsification mechanism in the rough microchannels employing high-speed imaging to reveal the different emulsification modes influenced by the size and oscillation intensity of the cavitation bubbles. The effect of emulsification modes on the O/W emulsion droplet size distribution for different surface roughness and frequency is demonstrated. The positive effect of the frequency on minimizing the droplet size utilizing a reactor with large pits is presented. We also demonstrate microreactor systems for a successful generation of miniemulsions with high dispersed phase volume fractions up to 20%. The observed emulsification mechanism in the rough microchannel offers new insights into the utility and scale-up of ultrasonic microreactors for emulsification. |
| first_indexed | 2024-04-09T23:43:55Z |
| format | Article |
| id | doaj.art-8fda599461f34a0cba4d452cfd62b246 |
| institution | Directory Open Access Journal |
| issn | 1350-4177 |
| language | English |
| last_indexed | 2024-04-09T23:43:55Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ultrasonics Sonochemistry |
| spelling | doaj.art-8fda599461f34a0cba4d452cfd62b2462023-03-18T04:40:32ZengElsevierUltrasonics Sonochemistry1350-41772023-03-0194106323Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequencyAniket Pradip Udepurkar0Christian Clasen1Simon Kuhn2Department of Chemical Engineering, Process Engineering for Sustainable Systems (ProcESS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, BelgiumDepartment of Chemical Engineering, Soft Matter, Rheology and Technology (SMaRT), KU Leuven, Celestijnenlaan 200J, 3001 Leuven, BelgiumDepartment of Chemical Engineering, Process Engineering for Sustainable Systems (ProcESS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium; Corresponding author.An ultrasonic microreactor with rough microchannels is presented in this study for oil-in-water (O/W) emulsion generation. Previous accounts have shown that surface pits or imperfections localize and enhance cavitation activity. In this study cavitation bubbles are localized on the rough microchannels of a borosilicate glass microreactor. The cavitation bubbles in the microchannel are primarily responsible for emulsification in the ultrasonic microreactor. We investigate the emulsification mechanism in the rough microchannels employing high-speed imaging to reveal the different emulsification modes influenced by the size and oscillation intensity of the cavitation bubbles. The effect of emulsification modes on the O/W emulsion droplet size distribution for different surface roughness and frequency is demonstrated. The positive effect of the frequency on minimizing the droplet size utilizing a reactor with large pits is presented. We also demonstrate microreactor systems for a successful generation of miniemulsions with high dispersed phase volume fractions up to 20%. The observed emulsification mechanism in the rough microchannel offers new insights into the utility and scale-up of ultrasonic microreactors for emulsification.http://www.sciencedirect.com/science/article/pii/S1350417723000354Ultrasonic microreactorsEmulsificationCavitationO/W emulsionPitsUltrasound frequency |
| spellingShingle | Aniket Pradip Udepurkar Christian Clasen Simon Kuhn Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency Ultrasonics Sonochemistry Ultrasonic microreactors Emulsification Cavitation O/W emulsion Pits Ultrasound frequency |
| title | Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency |
| title_full | Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency |
| title_fullStr | Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency |
| title_full_unstemmed | Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency |
| title_short | Emulsification mechanism in an ultrasonic microreactor: Influence of surface roughness and ultrasound frequency |
| title_sort | emulsification mechanism in an ultrasonic microreactor influence of surface roughness and ultrasound frequency |
| topic | Ultrasonic microreactors Emulsification Cavitation O/W emulsion Pits Ultrasound frequency |
| url | http://www.sciencedirect.com/science/article/pii/S1350417723000354 |
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