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Dynamic Equivalence between Soft Star Polymers and Hard Spheres



Zhe Wang, Antonio Faraone, Panchao Yin, Lionel Porcar, Yun Liu, Changwoo Do, Kunlun Hong, Wei-Ren Chen


We measure a series of star polymer dispersions to study the dynamics of soft colloidal liquids. We find that as the concentration increases, the slowing of the long-time self-diffusivity of the star polymer, normalized by the short-time self-diffusivity, can be mapped onto the hard-sphere behavior by using the condition of compressibility equivalence. This phenomenon reveals the dynamic equivalence between soft colloids and hard spheres, despite the apparent complexity of the interparticle interaction of the soft colloids. The novel methods for measuring the osmotic compressibility and the self-diffusivities of soft colloidal dispersions are also presented.
ACS Macro Letters


neutron spin echo, star polymers, colloid, diffusion


Wang, Z. , Faraone, A. , Yin, P. , Porcar, L. , Liu, Y. , Do, C. , Hong, K. and Chen, W. (2019), Dynamic Equivalence between Soft Star Polymers and Hard Spheres, ACS Macro Letters, [online], (Accessed June 21, 2024)


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Created November 18, 2019, Updated October 12, 2021