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Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles

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An Erratum to this article was published on 08 May 2010

Abstract

Mixtures of a hydrophobic triblock copolymer (L121, PEO5PPO68PEO5) and a hydrophobic anionic surfactant (AOT, Sodium bis(2-ethylhexyl)sulfosuccinate), each alone forming turbid vesicular solutions in water, aggregate to produce a thermodynamically stable, transparent, and isotropic solution. Mixed AOT/L121 aggregates could be confirmed by fluorescence, surface tension, differential scanning calorimetry (DSC), and isothermal titration calorimetry. In an isotropic region, where mixed aggregates are formed, there is a synergistic interaction between monomers of AOT and L121 in the mixture. In addition, small-angle neutron scattering experiments provided evidence that mixed aggregates have the shape of either spheres (with a certain polydispersity) or very short ellipsoids (axial ratio below 2), confirming a transition from giant multilamellar vesicles to small aggregates upon mixing the two hydrophobic amphiphiles. Upon dilution, the morphology changes to disk-like. From an examination of the results of all the methods the peculiar behavior of the mixed AOT/L121 system is explained.

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Acknowledgments

Authors are grateful to Dr. Sylvain Prévost (Meitner Institut, Berlin and Technischen Universität, Berlin, Germany) for his help in the analysis of SANS data and Dr. Alfredo González-Pérez (Lund University, Sweden) for Cryo-TEM observations. Authors also wish to thank Prof. Arturo Lopez-Quintela (Universidad Santiago de Compostela, Spain) for useful comments and Ana Maria Moreno (CSIC) for her help in the experiments.

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Authors and Affiliations

  1. Instituto de Química Avanzada de Cataluña, Consejo Superior de Investigaciones Científicas (IQAC-CSIC), Jordi Girona 18-26, 08034, Barcelona, Spain

    Carlos Rodríguez-Abreu

  2. CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain

    Carlos Rodríguez-Abreu & Margarita Sanchez-Domínguez

  3. Faculty of Chemistry and Chemical Technology, Aškerčeva 5, University of Ljubljana, Sl-1000, Ljubljana, Slovenia

    Bojan Šarac & Marija Bešter Rogač

  4. Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai 79-7, Hodogaya-ku, Yokohama, 240-8501, Japan

    Rekha Goswami Shrestha, Lok Kumar Shrestha & Dharmesh Varade

  5. UGC-DAE Consortium for Scientific Research, B.A.R.C., Trombay, Mumbai, 400 085, India

    Goutam Ghosh

  6. Solid State Physics Division, B.A.R.C., Trombay, Mumbai, 400 085, India

    Vinod K. Aswal

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  1. Carlos Rodríguez-Abreu
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Correspondence to Carlos Rodríguez-Abreu.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00396-010-2213-y

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Rodríguez-Abreu, C., Sanchez-Domínguez, M., Šarac, B. et al. Solution behavior of aqueous mixtures of low and high molecular weight hydrophobic amphiphiles. Colloid Polym Sci 288, 739–751 (2010). https://doi.org/10.1007/s00396-010-2188-8

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