Coating of fine Aerogel particles using spouted bed technology

Start Page
525
End Page
531
Citation
12th International Conference on Fluidized Bed Technology, CFB 2017: 525-531 (2017-05)
Contribution to Conference
12th International Conference on Fluidized Bed Technology, CFB 2017 
Scopus ID
2-s2.0-85052301404
Aerogels are porous and light-weighting materials with high inner surface area. Their properties enable to use them in many fields, e.g. as acoustic and thermal insulation materials, catalyst, adsorber or drug carriers. However, open pore structure does not allow their application in different areas because of change of the structure caused by liquid-contact. Therefore there is a protective layer on their surface needed, which provides new fields of application, e.g. in food products. In this work coating of the protein-based aerogel microspheres (dP < 100 μm) with shellac using spouted bed technology was performed. This method enables applying of dense, uniform and thin coating layer on fine particles. To improve the uniformity of the coating layer the specific surface area before and after the coating procedure was measured and showed clear decrease after longest coating time. To investigate the behavior ofaerogels in water containing medias the particles were exposed to water drops using sessile drop protocol. The coating protects the aerogel particles from water influence.
DDC Class
600: Technik
620: Ingenieurwissenschaften
More Funding Information
We gratefully acknowledge German Ministry of Economics and Energy (via AiF) and the FEI (Forschungskreis der Ernährungsindustrie e.V., Bonn) for financial support. Project number AiF 17485 N.