Journal Article

FZJ-2023-00999

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Resolving the different bulk moduli within individual soft nanogels using small-angle neutron scattering

Houston, J. E.Extern* ; Fruhner, L.FZJ* ; de la Cotte, A. ; Rojo González, J.Extern* ; Petrunin, A. V. ; Gasser, U. ; Schweins, R. ; Allgaier, J.FZJ* ; Richtering, W.Extern* ; Fernandez-Nieves, A. ; Scotti, A. (Corresponding author)

2022
Assoc. Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/sciadv.abn6129  doi:10.34734/FZJ-2023-00999

Abstract: The bulk modulus, K, quantifies the elastic response of an object to an isotropic compression. For soft compressible colloids, knowing K is essential to accurately predict the suspension response to crowding. Most colloids have complex architectures characterized by different softness, which additionally depends on compression. Here, we determine the different values of K for the various morphological parts of individual nanogels and probe the changes of K with compression. Our method uses a partially deuterated polymer, which exerts the required isotropic stress, and small-angle neutron scattering with contrast matching to determine the form factor of the particles without any scattering contribution from the polymer. We show a clear difference in softness, compressibility, and evolution of K between the shell of the nanogel and the rest of the particle, depending on the amount of cross-linker used in their synthesis.

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Contributing Institute(s):

1. Neutronenstreuung (JCNS-1)
2. Neutronenstreuung und biologische Materie (IBI-8)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

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