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Aqueous Foams Stabilized by in Situ Surface Activation of CaCO3 Nanoparticles via Adsorption of Anionic Surfactant

Cui, Z-G.; Cui, Y-Z.; Cui, C-F.; Chen, Z.; Binks, Bernard P

Authors

Z-G. Cui

Y-Z. Cui

C-F. Cui

Z. Chen



Abstract

The in situ surface activation of unmodified CaCO3 nanoparticles by interaction with surfactant in aqueous media has been studied, and the impact of this on the foamability and foam stability of aqueous dispersions was assessed. Using complementary experiments including measurement of particle zeta potentials, adsorption isotherms of surfactant, air-water surface tensions, and relevant contact angles, the mechanism of this activation was revealed. The results show that the non-surface-active CaCO3 nanoparticles cannot be surface activated by interaction with cationic or nonionic surfactants but can be surface activated by interaction with anionic surfactants such as SDS and AOT, leading to a synergistic effect in both foamability and foam stability. The electrostatic interaction between the positive charges on particle surfaces and the negative charges of anionic surfactant headgroups results in monolayer adsorption of the surfactant at the particle-water interface and transforms the particles from hydrophilic to partially hydrophobic such that particles become surface active and stabilize bubbles. SDS is a more efficient surfactant for this surface activation than AOT. Possible reasons for this difference are suggested.

Journal Article Type Article
Publication Date Aug 3, 2010
Journal LANGMUIR
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 26
Issue 15
Pages 12567-12574
APA6 Citation Cui, Z., Cui, Y., Cui, C., Chen, Z., & Binks, B. P. (2010). Aqueous Foams Stabilized by in Situ Surface Activation of CaCO3 Nanoparticles via Adsorption of Anionic Surfactant. Langmuir : the ACS journal of surfaces and colloids, 26(15), (12567-12574). doi:10.1021/la1016559. ISSN 0743-7463
DOI https://doi.org/10.1021/la1016559
Keywords Colloidal particles; Nonionic surfactants; Phase inversion; Silica water mixture