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Pickering emulsions stabilized by surface-modified Fe3O4 nanoparticles

Zhou, Jun; Wang, Lijun; Qiao, Xiuying; Binks, Bernard P.; Sun, Kang


Jun Zhou

Lijun Wang

Xiuying Qiao

Kang Sun


Unmodified Fe 3 O 4 nanoparticles do not stabilize Pickering emulsions of a polar oil like butyl butyrate. In order to obtain stable emulsions, the Fe 3 O 4 nanoparticles were modified by either carboxylic acid (RCOOH) or silane coupling agents (RSi(OC 2 H 5 ) 3 ) to increase their hydrophobicity. The influence of such surface modification on the stability of the resultant Pickering emulsions was investigated in detail for both a non-polar oil (dodecane) and butyl butyrate in mixtures with water. The stability of dodecane-in-water emulsions in the presence of carboxylic acid-coated part icles decreases as the length of the alkyl group (R) and the coating extent increase. However, such particles are incapable of stabilizing butyl butyrate-water emulsions even when the carboxylic acid length is decreased to two. However, the silane-coated Fe 3 O 4 nanoparticles can stabilize butyl butyrate-in-water emulsions, and they also increase the stability of dodecane-in-water emulsions. Thermal gravimetric analysis indicates that the molar quantity of silane reagent is much higher than that of carboxylic acid on nanoparticle surfaces after modification, raising their hydrophobicity and enabling enhanced stability of the resultant polar oil-water emulsions. © 2011 Elsevier Inc.

Journal Article Type Article
Publication Date Feb 1, 2012
Print ISSN 0021-9797
Electronic ISSN 1095-7103
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 367
Issue 1
Pages 213-224
APA6 Citation Zhou, J., Wang, L., Qiao, X., Binks, B. P., & Sun, K. (2012). Pickering emulsions stabilized by surface-modified Fe3O4 nanoparticles. Journal of colloid and interface science, 367(1), (213-224). doi:10.1016/j.jcis.2011.11.001. ISSN 0021-9797
Keywords Pickering emulsion; Fe3O4; Nanoparticles