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Characterization of the SiO2@PNiPAm core–shell particles (dc = 160 nm) with varying shell thicknesses and cross-linking densities: Temperature-dependent hydrodynamic diameter (dH) measured by DLS for different shell thicknesses (a) and cross-linking densities (b). (c) Swelling ratio β of the SiO2@PNiPAm core–shell particles. We notice a strong dependence of the cross-linking density on the swelling behavior, whereas the shell thickness had no effect on the swelling behavior.
