Structure, Dynamics, and Rheology of Realistic Gaussian-Core Fluids: Unexpected Anomalies and Their Macromolecular Origin

Huarui Wu; Dejia Kong; Lin Feng Wu; Yubin Ke; Mark Robertson; Lilin He; Zhe Wang

doi:10.1021/acs.macromol.3c00607

Structure, Dynamics, and Rheology of Realistic Gaussian-Core Fluids: Unexpected Anomalies and Their Macromolecular Origin

Huarui Wu, Dejia Kong, Lin Feng Wu, Yubin Ke, Mark Robertson, Lilin He, Zhe Wang

SANS & Spin Echo

Research output: Contribution to journal › Article › peer-review

Abstract

We experimentally investigate the structure, dynamics, and linear rheology of dendrimer solutions as a model system of Gaussian-core fluids and ultrasoft colloids, and compare the results with those obtained by the coarse-grained approach. In the overpacked regime, particles pack in a way similar to Bernal’s celebrated plasticine model. Meanwhile, the interparticle interaction displays a counterintuitive softening under densification. Such behaviors result in transport properties remarkably different from the predictions of the simple Gaussian-core model. Particularly, we find a strong coupling between the rearrangement of interparticle configuration and intraparticle dynamics. These unexpected observations demonstrate the decisive role of intraparticle complexity in the structure and dynamics of ultrasoft colloids.

Original language	English
Pages (from-to)	5628-5634
Number of pages	7
Journal	Macromolecules
Volume	56
Issue number	14
DOIs	https://doi.org/10.1021/acs.macromol.3c00607
State	Published - Jul 25 2023

Funding

This research was supported by the National Natural Science Foundation of China (no. 11975136). A portion of this research used resources at the High Flux Isotope Reactor (HFIR), a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The authors are grateful to the BL01 SANS beamline at the Chinese Spallation Neutron Source and the CG-2 GP-SANS beamline at HFIR for the SANS beamtime.

Funders	Funder number
Office of Science
Oak Ridge National Laboratory
National Natural Science Foundation of China	11975136

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title = "Structure, Dynamics, and Rheology of Realistic Gaussian-Core Fluids: Unexpected Anomalies and Their Macromolecular Origin",

abstract = "We experimentally investigate the structure, dynamics, and linear rheology of dendrimer solutions as a model system of Gaussian-core fluids and ultrasoft colloids, and compare the results with those obtained by the coarse-grained approach. In the overpacked regime, particles pack in a way similar to Bernal{\textquoteright}s celebrated plasticine model. Meanwhile, the interparticle interaction displays a counterintuitive softening under densification. Such behaviors result in transport properties remarkably different from the predictions of the simple Gaussian-core model. Particularly, we find a strong coupling between the rearrangement of interparticle configuration and intraparticle dynamics. These unexpected observations demonstrate the decisive role of intraparticle complexity in the structure and dynamics of ultrasoft colloids.",

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AU - He, Lilin

AU - Wang, Zhe

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AB - We experimentally investigate the structure, dynamics, and linear rheology of dendrimer solutions as a model system of Gaussian-core fluids and ultrasoft colloids, and compare the results with those obtained by the coarse-grained approach. In the overpacked regime, particles pack in a way similar to Bernal’s celebrated plasticine model. Meanwhile, the interparticle interaction displays a counterintuitive softening under densification. Such behaviors result in transport properties remarkably different from the predictions of the simple Gaussian-core model. Particularly, we find a strong coupling between the rearrangement of interparticle configuration and intraparticle dynamics. These unexpected observations demonstrate the decisive role of intraparticle complexity in the structure and dynamics of ultrasoft colloids.

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Structure, Dynamics, and Rheology of Realistic Gaussian-Core Fluids: Unexpected Anomalies and Their Macromolecular Origin

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