Scaling of polymer dynamics at an oil-water interface in regimes dominated by viscous drag and desorption-mediated flights

Journal of the American Chemical Society
Dapeng WangDaniel K Schwartz

Abstract

Polymers are found near surfaces and interfaces in a wide range of chemical and biological systems, and the structure and dynamics of adsorbed polymer chains have been the subject of intense interest for decades. While polymer structure is often inferred from dynamic measurements in bulk solution, this approach has proven difficult to implement at interfaces, and the understanding of interfacial polymer conformation remains elusive. Here we used single-molecule tracking to study the interfacial diffusion of isolated poly(ethylene glycol) molecules at oil-water interfaces. Compared to diffusion in dilute aqueous solution, which exhibited the expected dependence of the diffusion coefficient (D) upon molecular weight (M) of D ∼ M(-1/2) for a Gaussian chain, the behavior at the interface was approximately D ∼ M(-2/3), suggesting a significantly more expanded polymer conformation, despite the fact that the oil was a poor solvent for the polymer. Interestingly, this scaling remained virtually unchanged over a wide range of oil viscosity, despite the fact that at low viscosities the magnitude of the diffusion coefficient was consistent with expectations based on viscous drag (i.e., Stokes-Einstein diffusion), and for high viscosity oi...Continue Reading

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Citations

Dec 15, 2015·ACS Applied Materials & Interfaces·Yu Cai, Daniel K Schwartz
Nov 1, 2016·The Journal of Physical Chemistry Letters·Wenxiao WangChristy F Landes
May 19, 2017·Chemical Reviews·Hao ShenChristy F Landes
Mar 1, 2018·Annual Review of Physical Chemistry·Nicholas A MoringoChristy F Landes
Aug 25, 2018·Physical Chemistry Chemical Physics : PCCP·Boyao WenBofeng Bai
Feb 23, 2019·Analytical and Bioanalytical Chemistry·Yuanyuan MaLehui Xiao
May 9, 2019·Interface Focus·Giuliana Giunta, Paola Carbone
Sep 12, 2020·Soft Matter·Xiaoshuang WeiLaura C Bradley
Sep 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Nicholas A MoringoChristy F Landes
Oct 24, 2018·Analytical Chemistry·Herman CoceancighTakashi Ito
Sep 17, 2020·The Journal of Physical Chemistry. B·Fatemeh HassanpourAli Afkhami
Oct 6, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Yuehua ZhaoDapeng Wang

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