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Publisher DOI: 10.1007/s10570-021-04032-0
Title: Spray coating of cellulose aerogel particles in a miniaturized spouted bed
Language: English
Authors: Schroeter, Baldur 
Yonkova, Velislava P. 
Goslinska, Monika  
Orth, Maike  
Pietsch-Braune, Swantje  
Gurikov, Pavel 
Smirnova, Irina 
Heinrich, Stefan 
Keywords: Aerogel;Cellulose;Drug release;Shellac coating;Spouted bed
Issue Date: 4-Jul-2021
Publisher: Springer Science + Business Media B.V
Source: Cellulose 28 (12): 7795-7812 (2021-08-01)
Journal: Cellulose 
Abstract (english): 
Aim of this work is to apply protective and homogeneous shellac coating layers on the surface of hydrophilic open-pore cellulose aerogel particles with low densities ≤ 0.1 g/cm3 and high specific surface areas in the range of ~ 400–450 m2/g while keeping the aerogels’ microstructure intact during processing. For this purpose, an innovative miniaturized spouted bed setup was used. Successful process settings for application of enclosed films on aerogel surfaces without intrusion of coating material into the pores were determined. Precise control of coating layer thickness in the range of 10–50 µm was achieved due to variation of coating solution amount without agglomeration and clogging events occurring during processing. Comparison of bulk densities and specific surface areas before and after coating proved the intactness of the porous structure. Coating of particles loaded with vanillin led to controlled release, enhancing release half-life times from 20 to 1600 min. Overall, a successful strategy for coating of organic low-density aerogels was developed.
DOI: 10.15480/882.3813
ISSN: 0969-0239
Institute: Thermische Verfahrenstechnik V-8 
Feststoffverfahrenstechnik und Partikeltechnologie V-3 
Entwicklung und Modellierung Neuartiger Nanoporöser Materialien V-EXK2 
Document Type: Article
Project: Strategieentwicklung zur Beschichtung von offenporigen, nanoporösen Materialien mit geringer Dichte 
Projekt DEAL 
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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