Soft Interactions Modify the Diffusive Dynamics of Polymer-Grafted Nanoparticles in Solutions of Free Polymer

Poling-Skutvik, Ryan; Slim, Ali H.; Narayanan, Suresh; Conrad, Jacinta C.; Krishnamoorti, Ramanan

doi:10.1021/acsmacrolett.9b00294

Title: Soft Interactions Modify the Diffusive Dynamics of Polymer-Grafted Nanoparticles in Solutions of Free Polymer

Journal Article · Tue Jul 16 00:00:00 EDT 2019 · ACS Macro Letters

DOI:https://doi.org/10.1021/acsmacrolett.9b00294· OSTI ID:1559452

^[1]; Slim, Ali H. ^[1]; Narayanan, Suresh ^[2];

^[1];

^[1]

Univ, of Houston, Houston, TX (United States). Dept. of Chemical and Biomolecular Engineering
Argonne National Lab. (ANL), Argonne, IL (United States)

We examine the dynamics of silica particles grafted with high molecular weight polystyrene suspended in semidilute solutions of chemically similar linear polymer using X-ray photon correlation spectroscopy. The particle dynamics decouple from the bulk viscosity despite their large hydrodynamic size and instead experience an effective viscosity that depends on the molecular weight of the free polymer chains. Unlike for hard-sphere nanoparticles in semidilute polymer solutions, the diffusivities of the polymer-grafted nanoparticles do not collapse onto a master curve solely as a function of normalized length scales. Instead, the diffusivities can be collapsed across two orders of magnitude in free polymer molecular weight and concentration and one order of magnitude in grafted molecular weight by incorporating the ratio of free to grafted polymer molecular weights. These results suggest that the soft interaction potential between polymer-grafted nanoparticles and free polymer allows polymer-grafted nanoparticles to diffuse faster than predicted based on bulk rheology and modifies the coupling between grafted particle dynamics and the relaxations of the surrounding free polymer.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Welch Foundation, Houston, TX (United States); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1559452

Journal Information:: ACS Macro Letters, Vol. 8, Issue 8; ISSN 2161-1653

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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