| Titre : |
Ultrasonic milling of particles in micro- and nano-range |
| Type de document : |
texte imprimé |
| Auteurs : |
Kathrin Hielscher, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 29-32 |
| Langues : |
Anglais (eng) |
| Catégories : |
Cavitation
Dispersions et suspensions
Poudres
Ultrasons
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The dispersing and deagglomeration of solids into liquide is an important application of ultrasonic devices. If powders are wetted, the individual particles build agglomerates and are held together by attraction forces of various physical and chemical nature, including van der Waals forces and liquide surface tension. This effect is stronger for higher viscosity liquides, such as polymers or resins. The attraction forces must be overcome in order to deagglomerate and disperse the particles into liquid media. An even dispersion and deagglomeration is important to use the full potential of the particles. Especially nano particles offer extraordinary characteristics, which can only be exploited in a highly even dispersed state.
The application of mechanical stress - eg generated by ultrasonic cavitation - breaks the particle agglomerates apart. Also, liquid is pressed between the particles. Different technologies are commonly used for the dispersing of powders into liquides. These include high presure homogenisers, agitator bead mills,impinging jet mills and rotor-stator-mixers.
high intensity ultrasonication is an interesting alternative to these technologies and particularly for the particle treatment in the nano-size ranges the only effectual method to achieve the required results. |
| Note de contenu : |
- Ultrasonic cavitation
- Parameters
- Demonstration of ultrasonic milling and dispersing effects by means of specific materials examples
- Industrial implementation of ultrasound |
| En ligne : |
https://drive.google.com/file/d/1OGG0R59Y5L63gVdb38ceJwPwHxbebJh6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15562 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 202, N° 4574 (07/2012) . - p. 29-32
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Ultrasonic milling of particles in micro- and nano-range in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 202, N° 4574 (07/2012)
