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Dynamics of oil–water interface at the beginning of the ultrasonic emulsification processBoček, Žan ...A lot of effort has been dedicated in recent years towards understanding the basics of cavitation induced emulsification, mainly in the form of single cavitation bubbles. Regarding bulk acoustic ... emulsification, a lot less research has been done. In our here presented work we utilize advanced high-speed observation techniques in visible light and X-Rays to build upon that knowledge and advance the understanding of bulk emulsion preparation. During research we discovered that emulsion formation has an acute impact on the behavior of the interface and more importantly on its position relative to the horn, hence their interdependence must be carefully studied. We did this by observing bulk emulsification with 2 cameras simultaneously and corroborating these measurements with observation under X-Rays. Since the ultrasonic horns location also influences interface behavior, we shifted its initial position to different locations nearer to and further away from the oil–water interface in both phases. We found that a few millimeters distance between the horn and interface is not enough for fine emulsion formation, but that they must be completely adjacent to each other, with the horn being located inside the oil–water interface. We also observed some previously undiscovered phenomena, such as the splitting of the interface to preserve continuous emulsion formation, climbing of the interface up the horn and circular interface protrusions towards the horn forming vertical emulsion streams. Interestingly, no visible W/O emulsion was ever formed during our experiments, only O/W regardless of initial horn position.Source: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 101, Dec. 2023, str. 1-20)Type of material - article, component part ; adult, seriousPublish date - 2023Language - englishCOBISS.SI-ID - 170581251
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Boček, Žan | 56845 |
Petkovšek, Martin | 35069 |
Clark, Samuel J. | |
Fezzaa, Kamel | |
Dular, Matevž | 23471 |
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