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A Novel Integration Strategy for the Foaming and Hydrophobization of Geopolymer Foams by Chunling Dong; Ningning Shao; Feng Yan; Ru Ji; Xuankun Wei; Zuotai Zhang is a Engineering article available to read on EtoBox.

What is A Novel Integration Strategy for the Foaming and Hydrophobization of Geopolymer Foams about?

Traditionally, hydrophobic geopolymer foams (GPFs) are prepared in two steps: GPFs hardening and hydrophobic treatment. Here, we reported a novel two-in-one strategy for the simultaneous foaming and hydrophobization of GPFs by using polymethylhydrosiloxane (PMHS) as the key double-functional agent and calcium stearate (CS) as the foam stabilizer. With the combined effect of PMHS and CS, the pore size could be controlled in the range of 0.27–6.82 mm and bulk density in 200–700 kg/m3, which further influenced the compressive strength and thermal conductivity. The as-prepared GPFs showed superhydrophobic properties, with contact angles as high as 170°. Theoretically, alkylated nano‐silicon fibers grew on the GPFs surface, which acted as a hydrophobic cover and increase the surface roughness, both contributing to the superhydrophobic. Overall, our work presents a novel two-in-one strategy for the preparation of superhydrophobic GPFs, which would be of great significance to the application of GPFs.

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Author

Chunling Dong; Ningning Shao; Feng Yan; Ru Ji; Xuankun Wei; Zuotai Zhang

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)