Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering

H. Iijima; T. Kato; T. Seimiya; H. Yoshida; M. Imai

doi:10.1007/BF01189492

Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering

H. Iijima, T. Kato, T. Seimiya, H. Yoshida, M. Imai

SCI - Physics

Tokyo Metropolitan University

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Small-angle X-ray and neutron scattering (SAXS and SANS, respectively) have been measured in H₂O solutions of cesium perfluorooctanoate (CsPFO) in the concentration range 65-500 mM (below the phase boundary between micellar and discotic nematic phases). The data have been analyzed with a double-layered ellipsoid form factor combined with the rescaled meanspherical approximation for the intermicellar structure factor. The scattering curves in the lower-concentration range are fitted well with oblate ellipsoid rather than prolate ellipsoid. Both the aggregation number and the degree of counterion binding increase with increasing surfactant concentration, which is consistent with the concentration dependences of the ¹³³Cs and ¹⁹F NMR chemical shifts.

Original language	English
Pages (from-to)	61-63
Number of pages	3
Journal	Progress in Colloid and Polymer Science
Volume	106
DOIs	https://doi.org/10.1007/BF01189492
Publication status	Published - 1997

Keywords

Disk-like micelle
Fluorinated surfactant
Micelle
Small-angle scattering

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10.1007/BF01189492

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title = "Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering",

abstract = "Small-angle X-ray and neutron scattering (SAXS and SANS, respectively) have been measured in H2O solutions of cesium perfluorooctanoate (CsPFO) in the concentration range 65-500 mM (below the phase boundary between micellar and discotic nematic phases). The data have been analyzed with a double-layered ellipsoid form factor combined with the rescaled meanspherical approximation for the intermicellar structure factor. The scattering curves in the lower-concentration range are fitted well with oblate ellipsoid rather than prolate ellipsoid. Both the aggregation number and the degree of counterion binding increase with increasing surfactant concentration, which is consistent with the concentration dependences of the 133Cs and 19F NMR chemical shifts.",

keywords = "Disk-like micelle, Fluorinated surfactant, Micelle, Small-angle scattering",

author = "H. Iijima and T. Kato and T. Seimiya and H. Yoshida and M. Imai",

year = "1997",

doi = "10.1007/BF01189492",

language = "English",

volume = "106",

pages = "61--63",

journal = "Progress in Colloid and Polymer Science",

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TY - JOUR

T1 - Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering

AU - Iijima, H.

AU - Kato, T.

AU - Seimiya, T.

AU - Yoshida, H.

AU - Imai, M.

PY - 1997

Y1 - 1997

N2 - Small-angle X-ray and neutron scattering (SAXS and SANS, respectively) have been measured in H2O solutions of cesium perfluorooctanoate (CsPFO) in the concentration range 65-500 mM (below the phase boundary between micellar and discotic nematic phases). The data have been analyzed with a double-layered ellipsoid form factor combined with the rescaled meanspherical approximation for the intermicellar structure factor. The scattering curves in the lower-concentration range are fitted well with oblate ellipsoid rather than prolate ellipsoid. Both the aggregation number and the degree of counterion binding increase with increasing surfactant concentration, which is consistent with the concentration dependences of the 133Cs and 19F NMR chemical shifts.

AB - Small-angle X-ray and neutron scattering (SAXS and SANS, respectively) have been measured in H2O solutions of cesium perfluorooctanoate (CsPFO) in the concentration range 65-500 mM (below the phase boundary between micellar and discotic nematic phases). The data have been analyzed with a double-layered ellipsoid form factor combined with the rescaled meanspherical approximation for the intermicellar structure factor. The scattering curves in the lower-concentration range are fitted well with oblate ellipsoid rather than prolate ellipsoid. Both the aggregation number and the degree of counterion binding increase with increasing surfactant concentration, which is consistent with the concentration dependences of the 133Cs and 19F NMR chemical shifts.

KW - Disk-like micelle

KW - Fluorinated surfactant

KW - Micelle

KW - Small-angle scattering

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JO - Progress in Colloid and Polymer Science

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ER -

Micellar growth in dilute solutions of cesium perfluorooctanoate studied by small-angle X-ray and neutron scattering

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