Title: Nanoscale viscosity of confined polyethylene oxide

Abstract

Complex fluids near interfaces or confined within nanoscale volumes can exhibit substantial shifts in physical properties compared to bulk, including glass transition temperature, phase separation, and crystallization. Because studies of these effects typically use thin film samples with one dimension of confinement, it is generally unclear how more extreme spatial confinement may influence these properties. In this work, we used x-ray photon correlation spectroscopy and gold nanoprobes to characterize polyethylene oxide confined by nanostructured gratings (<100nm width) and measured the viscosity in this nanoconfinement regime to be ~500 times the bulk viscosity. Here, this enhanced viscosity occurs even when the scale of confinement is several times the polymer's radius of gyration, consistent with previous reports of polymer viscosity near flat interfaces.

Authors:

Zhang, Zheng ^[1]; Ding, Junjun  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-7025-0617"
• Search orcid.org for ORCID "0000-0002-7025-0617"

Ocko, Benjamin M. ^[1]; Fluerasu, Andrei ^[1]; Wiegart, Lutz ^[1]; Zhang, Yugang ^[1]; Kobrak, Mark ^[3]; Tian, Ye ^[1]; Zhang, Honghu ^[1]; Lhermitte, Julien ^[1]; Choi, Chang-Hwan ^[2]; Fisher, Frank T.  ^[2];

• Search DOE PAGES for author "Fisher, Frank T."
• Search DOE PAGES for ORCID "0000-0003-4476-5040"
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Yager, Kevin G.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-7745-2513"
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Black, Charles T. ^[1]

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+ Show Author Affiliations

1. Brookhaven National Lab. (BNL), Upton, NY (United States)
2. Steven Inst. of Technology, Hoboken, NJ (United States)
3. Brooklyn College and the Graduate Center of the City University of New York, Brooklyn, NY (United States)

Publication Date:

2019-12-19

Research Org.:

Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

OSTI Identifier:

1593244

Report Number(s):

BNL-213558-2020-JAAM
Journal ID: ISSN 2470-0045; PLEEE8

Grant/Contract Number:  

SC0012704

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review E

Additional Journal Information:

Journal Volume: 100; Journal Issue: 6; Journal ID: ISSN 2470-0045

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE