High-porosity geopolymer foams with tailored porosity for thermal insulation and wastewater treatment. Issue 17 (17th April 2017)

• Record Type: Journal Article
• Authors: Bai, Chengying; Franchin, Giorgia; Elsayed, Hamada; Zaggia, Alessandro; Conte, Lino; Li, Hongqiang; Colombo, Paolo
• Is Part Of: Journal of materials research. Volume 32:Issue 17(2017)
• Page Start: 3251
• Page End: 3259
• Publication Date: 2017-04-17
• Subjects: foam, -- adsorption, -- thermal conductivity; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2017.127
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : High-porosity metakaolin-based geopolymer foams (GFs) were fabricated by a gelcasting technique using hydrogen peroxide (foaming agent) in combination with Tween 80 (surfactant). Slurries processed in optimized conditions enabled to fabricate potassium based GFs with a total porosity in the range of ∼67 to ∼86 vol% (∼62 to ∼84 vol% open), thermal conductivity from ∼0.289 to ∼0.091 W/mK, and possessing a compressive strength from ∼0.3 to ∼9.4 MPa. Moreover, factors that influence the compressive strength, the porosity, the thermal conductivity, and the cell size distribution were investigated. The results showed that the cell size and size distribution can be controlled by adding different content of surfactant and foaming agent. The foamed geopolymer can also be used as adsorbents for the removal of copper and ammonium ions from wastewater. The foams, due to their low thermal conductivity, could also be used for thermal insulation. It was also possible to produce geopolymer formulations that could be printed using additive manufacturing technology (Direct Ink writing), which enabled to produce components with nonstochastic porosity.