Role of chain length and electrolyte on the micellization of anionic fluorinated surfactants in water
Role of chain length and electrolyte on the micellization of anionic fluorinated surfactants in water
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链长和电解质对阴离子氟化表面活性剂在水中胶束化的作用
DOI:
10.1016/j.colsurfa.2021.127313
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Alexandridis, Paschalis
中科院分区:
文献类型:
--
作者:
Kancharla, Samhitha;Jahan, Ruksana;Bedrov, Dmitry;Tsianou, Marina;Alexandridis, Paschalis
The micellization of ionic surfactants in aqueous media reflects a balance between the hydrophobic attraction of surfactant tails and the electrostatic repulsion of surfactant headgroups. We investigate here the effect on surfactant micellization of the hydrophobic chain length and electrolyte composition, by focusing on the fluorinated surfactants sodium perfluorohexanoate (NaPFHx) and sodium perfluorooctanoate (NaPFO) in aqueous solution without/with NaCl, and analyzing experimental data from surface tension, pyrene fluorescence, small-angle neutron scattering (SANS), and viscosity techniques. The CMC of NaPFHx in water was 200 mM, much higher than that of NaPFO, 30 mM, due to the additional two -CF2- groups of the latter. Upon addition of 0.25 M NaCl to the aqueous solution, the CMC of NaPFHx and NaPFO decreased by about 50% and 80%, respectively. The NaPFHx and NaPFO micelles are both ellipsoid in shape. NaPFHx forms smaller micelles compared to NaPFO: the association number for NaPFHx in D2O was 15 compared to 25 for NaPFO. Upon NaCl addition, the micelle shape became more elongated. This is the first report on the NaPFHx micelle structure. The information presented here supports the re-formulation and replacement of long-chain fluorinated surfactants with relatively safer long-chain surfactants.
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DOI:
10.1021/j100388a016
发表时间:
1990
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
P. Mukerjee;M. Gumkowski;Chun;Ravi Sharma
通讯作者:
Ravi Sharma
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
E. Blanco;P. Messina;J. Ruso;G. Prieto;F. Sarmiento
通讯作者:
F. Sarmiento
影响因子:
3.9
作者:
BERR, SS;JONES, RRM
通讯作者:
JONES, RRM
影响因子:
2.4
作者:
Ryan A. Orizondo;Diane L. Nelson;M. Fabiilli;K. Cook
通讯作者:
K. Cook
影响因子:
5.6
作者:
Kancharla, Samhitha;Canales, Emmanuel;Alexandridis, Paschalis
通讯作者:
Alexandridis, Paschalis