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Microstructure of Gelled Bicontinuous Microemulsions

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Gelled Bicontinuous Microemulsions

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Abstract

To verify the orthogonal self-assembled character of gelled bicontinuous microemulsions it is important to study not only their phase behaviour and rheological properties (see Sect.4.3) but also their microstructure. In orthogonal self-assembled systems the microstructures of the base systems are maintained and coexist with each other. Thus in case of gelled bicontinuous microemulsions one expects bicontinuous microemulsion domains to coexist with a three-dimensional gelator network. In order to prove this assumption for the system H2O–n-decane/12-HOA–C10E4 the microstructure was investigated with different methods. Those methods were also applied to the base systems, i.e. the non-gelled bicontinuous microemulsion H2O–n-decane–C10E4 and the binary gel n-decane/12-HOA, to be able to disclose the structural similarities. First, the gelled and the non-gelled microemulsion were studied with 1H-NMR self-diffusion measurements. Those revealed that the microemulsion domains are indeed bicontinuous at the \(\widetilde{T}\) temperature, irrespective of the presence of the gelator network (Sect. 4.1). The coexistence of the bicontinuous microemulsion with the network of 12-HOA fibers was subsequently demonstrated with small angle neutron scattering (SANS, Sect. 4.2) and freeze-fracture transmission electron microscopy (FFEM, Sect. 4.3). The scattering curves of the gelled bicontinuous microemulsion comprise the characteristic scattering patterns of both base systems and the FFEM pictures visualize the coexisting microstructures.

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Notes

  1. 1.

    The measurement of the melting point was carried out in a Thiele tube SMP-20 from Büchi with a heating rate of 0.2 K min−1.

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  1. Institute of Physical Chemistry, University of Stuttgart, Stuttgart, Germany

    Michaela Laupheimer

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  1. Michaela Laupheimer
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Laupheimer, M. (2014). Microstructure of Gelled Bicontinuous Microemulsions. In: Gelled Bicontinuous Microemulsions. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-07719-2_4

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