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The Structure of Triton X 100 and Hexadecylpyridinium Chloride in Aqueous Solutions: Fluorescence and Small-Angle X-Ray Scattering Studies in the Presence of Hg(CN)2

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Surfactants in Solution

Abstract

Small-angle X-ray scattering experiments on hexadecylpyridinium chloride (CPCl) micelles and micelles of Triton X 100 in aqueous solutions were conducted in the presence and absence of Hg (CN)2 at 20°C. In addition, fluorescence measurements were performed by probing the hydrophobic nature of Hg(CN)2 in the hydrophobic core of both micelles. From fluorescence depolarisation experiments it was possible to determine the distance of Hg-(CN)2 to the pyridinium group of about 10-12 Å (20°C) from energy transfer calculations; and in Triton X 100 micelles the distance determined between Hg(CN)2 and the phenoxy group was estimated to be 16.5 Å. Smallangle X-ray scattering experiments support the spectroscopic results regarding the location of Hg(CN)2 within the hydrophobic moieties of both micelles by inspection of the radial net electron density distribution functions. Through variation of the contrast with H2 O the dependency of the apparent radius of gyration upon the density of the solvent was determined: it was discovered that the decrease of Rg with the solvent density is parabolic rather than linear, more pronounced in the presence of tightly bound Tl+ at the boundary between hydrocarbon and hydrophobic regions. In conjunction with ultracentrifugation experiments by varying the density of the solvent in addition to the molecular mass and aggregation numbers, the interaction parameter for several additives was determined.

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Author information

Authors and Affiliations

  1. Department Biotechnology and Physical Chemistry, Märkische Fachhochschule, Frauenstuhlweg 31, D-5860, Iserlohn, Germany

    Henrich H. Paradies

  2. Research and Development, Medice Inc., D-5860, Iserlohn, West Germany

    Henrich H. Paradies

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  1. Henrich H. Paradies
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Editor information

Editors and Affiliations

  1. IBM US Technical Education, 500 Columbus Ave., Thornwood, NY, 10594, USA

    K. L. Mittal

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© 1989 Plenum Press, New York

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Paradies, H.H. (1989). The Structure of Triton X 100 and Hexadecylpyridinium Chloride in Aqueous Solutions: Fluorescence and Small-Angle X-Ray Scattering Studies in the Presence of Hg(CN)2 . In: Mittal, K.L. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7984-7_9

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  • DOI: https://doi.org/10.1007/978-1-4615-7984-7_9

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-7986-1

  • Online ISBN: 978-1-4615-7984-7

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