Ceramic foams shaped by oppositely charged dispersant and surfactant

[Display omitted] Wet foams fabricated by direct foaming for use as ceramic foams are usually fixed with extra additives. Here, we fabricated alumina ceramic foams involving only an anionic dispersant (ammonium polyacrylate, NHPA) and a cationic surfactant (dodecyltrimethylammonium chloride, DTAC) w...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2018-01, Vol.537, p.210-216
Main Authors: Zhao, Jin, Shimai, Shunzo, Zhou, Guohong, Zhang, Jian, Wang, Shiwei
Format: Article
Language:English
Subjects:
Ceramic foam
Dispersant
Hydrophobic interaction
Surfactant
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Summary:[Display omitted] Wet foams fabricated by direct foaming for use as ceramic foams are usually fixed with extra additives. Here, we fabricated alumina ceramic foams involving only an anionic dispersant (ammonium polyacrylate, NHPA) and a cationic surfactant (dodecyltrimethylammonium chloride, DTAC) without extra additives. DTAC interacted with the NHPA adsorbed on alumina particles and changed the zeta potential and hydrophobicity of the particles. In wet foam, the partially hydrophobic particles not only acted as foam stabilizers, but also formed a 3D network, which fixed the wet foam. By optimizing NHPA and DTAC concentration, alumina ceramic foam with high porosity (79.8%), small average cell size (50μm) and high compressive strength (30.3MPa) was obtained. This facile method is promising to fabricate any other ceramic foam due to its universal nature.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2017.10.022