| Titre : |
Optimum particle size is essential |
| Type de document : |
texte imprimé |
| Auteurs : |
Thomas Rentschler, Auteur ; Armin Reller, Auteur |
| Année de publication : |
1999 |
| Article en page(s) : |
p. 80-89 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Dioxyde de titane
Pigments inorganiques
Taille des particules
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The size of the TiO2 crystallites is of great importance for both the specific properties and the required qualities of the products, respectively. Primary particle sizes of different TiO2 pigments were determined by the Scherrer method applying synchrotron radiation. The results correspond to findings calculated from their BET surfaces for large pigments as well as for ultra-fine TiO2 samples. These methods were compared to additional indirect particle size analysis in dispersed media applying various dispersion energies. The particle diameters of the base pigments were correlated to the light scattering properties and durability data upon artificial weathering of the final products in varnishes. |
| Note de contenu : |
- Primary particles can flocculate, agglomerate or aggregate
- Highly coherent synchroton radiation determines crystallite particle size up to 1 µm
- Calciner discharges of rutile and anastase are tested
- Experimental conditions
- Each method of measurement may yield results unique to itself
- Increase of the particle size according to higher firing temperatures
- Spezific surface area confirms growth of the primary particles
- Particles size determination in dispersions provides complex information
- Exclusively primary particles of agglomerated rutile samples can not be attained
- Methods are applicable to industrial type TiO2 pigments
- Size of coherent scattering domains and actual prevailing particles are different for nanoscalic materials
- Particle sizes and size distibutions of final pigmentary products are practically constant
- Scaterring power increases strogly with increasing annealing temperature
- A sensitive method to monitor the correlation of pigment properties
- Anatase impurities deteriorate the durability of paints
- Conclusions |
| En ligne : |
https://drive.google.com/file/d/14bvj7VdQjJXgsUIM6KZw6-3txDNGRFeq/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11176 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 4/99 (04/1999) . - p. 80-89
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