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Publisher DOI: 10.3390/gels8110691
Title: Organic bio-based aerogel from food waste : preparation and hydrophobization
Language: English
Authors: Gaggero, Giulia 
Subrahmanyam, Raman 
Schröter, Baldur  
Gurikov, Pavel 
Delucchi, Marina 
Keywords: aerogel; bio-based; organic; hydrophobization
Issue Date: 26-Oct-2022
Publisher: Multidisciplinary Digital Publishing Institute
Source: Gels 8 (11): 691 (2022)
Abstract (english): 
In this work, organic aerogels from spent ground coffee and apple pomace were prepared and characterized for the first time. Apple aerogel was found to be much lighter than that from coffee (0.19 vs. 0.016 g/cm₃, whereas the specific surface areas are comparable (229 vs. 208 m₂/g). Being intrinsically hydrophilic, these aerogels were silanized, both in liquid and gas phase, to increase stability in aqueous media. The latter modification method allowed chemical grafting of the silane to the aerogel surface (evidenced by FTIR and TGA) and resulted in certain hydrophobicity, as was evidenced via contact angle measurements: both aerogels possess a contact angle of ca. 100° after the gas hydrophobization, while for the pristine aerogels it was 50°. Furthermore, it was observed that the gas-phase silanization process is more applicable to apple aerogels.
DOI: 10.15480/882.4671
ISSN: 2310-2861
Journal: Gels 
Other Identifiers: doi: 10.3390/gels8110691
Institute: Thermische Verfahrenstechnik V-8 
Entwicklung und Modellierung Neuartiger Nanoporöser Materialien V-EXK2 
Document Type: Article
Project: Advanced Engineering and Research of aeroGels for Environment and Life Sciences 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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