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Inclusion of Laponite nanoparticles in a lyotropic lamellar phase

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Abstract

In this work, we consider a ternary system formed by a surfactant with a lamellar phase (lecithin) that was doped with a solution of Laponite at 1% by volume. The inclusion of nanoparticles in the lamellar phase was investigated by the small-angle X-ray scattering (SAXS) technique, which revealed three types of structures according to the observed scattering pattern. The lamellar period increased linearly with hydration up to a certain limit; this type of behavior is not the same as that found for a similar system using AOT as a surfactant. In the region that corresponds to an isotropic phase, it was observed that the period corresponds to 60 Å, and in the lamellar system of pure lecithin, with the same volumetric fraction (1/φ = 0.66), the corresponding periodicity is 62 Å, indicating that the presence of Laponite nanoparticles increases the attractive interaction, reducing the lamellar period, causing the bilayer to become more rigid, that is, with less fluctuations. In the more diluted region, the periodicity reached a limit value of 64 Å, which is slightly higher than the lamellar system in the absence of Laponite particles, so there was an expansion of the lamellar phase due to the lack of consistency of Laponite nanoparticles. In the more concentrated lamellar phase (under strong confinement), it was observed that the distance between the bilayers decreased, establishing a long-range order.

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Acknowledgements

We are grateful to the Complex Fluids Group at UnB for letting us use the laboratory and to CAPES for the scholarship.

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  1. Departamento de Física, Universidade de Brasília, Brasília, Brazil

    Girlane Castro Costa Leite

  2. Departamento de Física, Universidade Federal do Maranhão, São Luís, MA, Brazil

    Gilson Carlos Castro Costa Leite

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  1. Girlane Castro Costa Leite
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  2. Gilson Carlos Castro Costa Leite
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Correspondence to Girlane Castro Costa Leite.

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Leite, G.C.C., Leite, G.C.C.C. Inclusion of Laponite nanoparticles in a lyotropic lamellar phase. J Biol Phys 47, 49–59 (2021). https://doi.org/10.1007/s10867-021-09564-x

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  • DOI: https://doi.org/10.1007/s10867-021-09564-x

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