[article]
| Titre : |
Echo-nomical testing |
| Type de document : |
texte imprimé |
| Auteurs : |
Vitaly Buckin, Auteur ; Evgeny D. Kudryashov, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 10-14 |
| Langues : |
Anglais (eng) |
| Catégories : |
Contrôle non destructif
Spectroscopie de résonance acoustique
Ultrasons
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
It can be difficult and time-consuming to predict the behaviour of emulsions other complex systems, such as paints, but the use of ultrasound could offer some interesting alternatives. The author show how valuable information on liquid dynamics, such as stability prediction, can be obtained.
High-Resolution ultrasonic Spectroscopy (HR-US) is a new technique for material analysis. This is based on the measurements of velocity and attenuation on acoustical waves at high, ultrasonic frequencies propagating through materials. Optical transparency is not required because ultrasonic waves propagate through opaque systems, thereby making the technique relevant for non-transparent as well as transparent samples. In all cases the technique provides a fast and non-destructive analysis of samples. HR-US ultrasonic spectrometers can be used in a variety of segments, including the polymers, paints and coatings industry, for an equally versatile range of tests. A number of applications are shown in Table 1. |
| Note de contenu : |
- Application areas
- Stability testing
-Improving storage
- Understanding fluid dynamics
- Micelle formation
- Ultrasound and alternatives
- FIGURES : 1. Change in ultrasonic velocity and attenuation coefficient enables determination of agglomeration and precipitation as calcium is increased - 2. In the first emulsion, the regular cycle of ultrasonic velocity and attenuation with the thermal cycles shows that this emulsion has thermal stability. In contrast, the shape of the red line is more irregular, showing that emulsion 2 has destabilised on the first cycle (at 40°C) - 3. Ultrasound can be used to determine the Critical Micelle Concentration, as shown at 25mmol surfactant for the blue line. At this point the surfactant molecules form micelles, resulting in a drop in ultrasonic velocity |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27990 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4456 (09/2002) . - p. 10-14
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