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. 2015;5(95):78142-78149.
doi: 10.1039/C5RA12388G. Epub 2015 Sep 4.

Aggregate-based sub-CMC Solubilization of Hexadecane by Surfactants

Hua Zhong  1 , Lei Yang  2 , Guangming Zeng  2 , Mark L Brusseau  3 , Yake Wang  3 , Yang Li  4 , Zhifeng Liu  2 , Xingzhong Yuan  2 , Fei Tan  2
Affiliations

Aggregate-based sub-CMC Solubilization of Hexadecane by Surfactants

Hua Zhong et al. RSC Adv. 2015.

Abstract

Solubilization of hexadecane by two surfactants, SDBS and Triton X-100, at concentrations near the critical micelle concentration (CMC) and the related aggregation behavior was investigated in this study. Solubilization was observed at surfactant concentrations lower than CMC, and the apparent solubility of hexadecane increased linearly with surfactant concentration for both surfactants. The capacity of SDBS to solubilize hexadecane is stronger at concentrations below CMC than above CMC. In contrast, Triton X-100 shows no difference. The results of dynamic light scattering (DLS) and cryogenic TEM analysis show aggregate formation at surfactant concentrations lower than CMC. DLS-based size of the aggregates (d) decreases with increasing surfactant concentration. Zeta potential of the SDBS aggregates decreases with increasing SDBS concentration, whereas it increases for Triton X-100. The surface excess (Γ) of SDBS calculated based on hexadecane solubility and aggregate size data increases rapidly with increasing bulk concentration, and then asymptotically approaches the maximum surface excess (Γmax). Conversely, there is only a minor increase in Γ for Triton X-100. Comparison of Γ and d indicates that excess of surfactant molecules at aggregate surface has great impact on surface curvature. The results of this study demonstrate formation of aggregates at surfactant concentrations below CMC for hexadecane solubilization, and indicate the potential of employing low-concentration strategy for surfactant application such as remediation of HOC contaminated sites.

Keywords: SDBS; Triton X-100; aggregation; critical micelle concentration; solubilization; surfactant.

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References

    1. Abriola LM, Drummond CD, Hahn EJ, Hayes KF, Kibbey TCG, Lemke LD, Pennell KD, Petrovskis EA, Ramsburg CA, Rathfelder KM. Environ. Sci. Technol. 2005;39:1778–1790. - PubMed
    1. Childs J, Acosta E, Annable MD, Brooks MC, Enfield CG, Harwell JH, Hasegawa M, Knox RC, Rao PS, Sabatini DA, Shiau B, Szekeres E, Wood AL. J. Contam. Hydrol. 2006;82:1–22. - PubMed
    1. Masrat R, Maswal M, Dar AA. J. Hazard. Mater. 2013;244:662–670. - PubMed
    1. Pennell KD, Abriola LM, Weber WJ., Jr Environ. Sci. Technol. 1993;27:2332–2340.
    1. Kile DE, Chiou CT. Environ. Sci. Technol. 1989;23:832–838.

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