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Diffusion of rigid nanoparticles in crowded polymer-network hydrogels: dominance of segmental density over crosslinking density

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Abstract

Swollen polymer-network gels usually exhibit notable spatial inhomogeneity of their crosslinking density. The effect of this inhomogeneity on the permeability of the gel to small particles is of major importance in many applications such as those in analytical separation technology. To systematically address this effect, we mimic inhomogeneous polymer-network gels by dense-packed pastes of sub-micrometer-sized microgel building blocks with two distinctly different crosslinking degrees. The diffusive mobility of rigid nanoparticle tracers within these inhomogeneous pastes that contain purposely imparted densely and loosely cross-linked local domains is studied by spatially resolved dual-focus fluorescence correlation spectroscopy on a sub-micrometer length scale. The outcome of this investigation is that the sub-micrometer-scale tracer diffusivity of the tracers is not affected by the gel-matrix crosslinking density, and hence, also not by its spatial inhomogeneity. Instead, the tracer diffusion is dominantly hindered by the high density of polymer segments in the deswollen gel matrixes.

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Acknowledgements

K.M. and U.W. acknowledge support by the National Cancer Institute of the National Institutes of Health under Award Number U54CA199081.

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Authors and Affiliations

  1. RWTH Aachen University, Institute of Physical Chemistry, JARA, Soft Matter Science, D-52074, Aachen, Germany

    Stefan Walta & Walter Richtering

  2. Physical-Chemistry Department, Adocia SA, 69003, Lyon, France

    Fany Di Lorenzo

  3. Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA

    Kai Ma & Ulrich Wiesner

  4. Johannes Gutenberg-Universität Mainz, Institute of Physical Chemistry, 55128, Mainz, Germany

    Sebastian Seiffert

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  1. Stefan Walta
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  2. Fany Di Lorenzo
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  3. Kai Ma
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  4. Ulrich Wiesner
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  5. Walter Richtering
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Correspondence to Walter Richtering or Sebastian Seiffert.

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Walta, S., Di Lorenzo, F., Ma, K. et al. Diffusion of rigid nanoparticles in crowded polymer-network hydrogels: dominance of segmental density over crosslinking density. Colloid Polym Sci 295, 1371–1381 (2017). https://doi.org/10.1007/s00396-017-4069-x

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  • DOI: https://doi.org/10.1007/s00396-017-4069-x

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