Submicron gas bubbles in water
| العنوان: | Submicron gas bubbles in water |
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| المؤلفون: | Eklund, Fredrik, 1972 |
| مصطلحات موضوعية: | microbubbles, nanobubbles, ultrafine bubbles, digital holographic microscopy, nanoparticle tracking analysis |
| الوصف: | Gas bubbles smaller than 1 micrometre in water, commonly referred to as nanobubbles, is a growing field of research and innovation. Applications range from medical imaging and drug delivery to mining industry and environmental remediation. Despite much activity, important questions remain – which are the mechanisms that allow small gas bubbles to be stable against dissolution and are stable nanobubbles really as common and easily generated as is often claimed? This work demonstrates that several common nanobubble generation methods can generate particle agglomerates or oil droplets which can be mistaken for bubbles, whereas stable nano- and microbubbles are less easy to generate than commonly believed. The results further suggest that stable bubbles are normally stable due to a shell of surface-active organic compounds, whereas other proposed stability mechanisms are less likely. An unexpected finding was that sorbitan surfactant stabilized air nanobubbles can form long-lived bubble agglomerates. Holographic Nanoparticle Tracking Analysis (H-NTA) is demonstrated as a powerful new method to detect and differentiate between bubbles and particles in the same dispersion. As H-NTA determines the refractive index of tracked objects, bubbles will differ very significantly from solid particles or oil droplets. The method also enables detection of different populations of particles, agglomerates and oil droplets in the same dispersion. |
| وصف الملف: | electronic |
| URL الوصول: | https://research.chalmers.se/publication/518417 https://research.chalmers.se/publication/518417/file/518417_Fulltext.pdf |
| قاعدة البيانات: | SwePub |
| ردمك: | 9179053491 9789179053499 |
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