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Depletion layer dynamics of polyelectrolyte solutions under Poiseuille flow

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Title
Depletion layer dynamics of polyelectrolyte solutions under Poiseuille flow
Author(s)
Seong Jun Park; Anisha Shakya; John T. King
Publication Date
2019-08
Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.116, no.33, pp.16256 - 16261
Publisher
NATL ACAD SCIENCES
Abstract
© 2019 National Academy of Sciences. All rights reserved.Complex liquids flow through channels faster than expected, an effect attributed to the formation of low-viscosity depletion layers at the boundaries. Characterization of depletion layer length scale, concentration, and dynamics has remained elusive due in large part to the lack of suitable real-space experimental techniques. The short length scales associated with depletion layers have traditionally prohibited direct imaging. By overcoming this limitation via adaptations of stimulated emission depletion (STED) microscopy, we directly measure the concentration profile of polymer solutions at a nonadsorbing wall under Poiseuille flow. Using this approach, we 1) confirm the theoretically predicted concentration profile governed by entropically driven depletion, 2) observe depletion layer narrowing at low to intermediate shear rates, and 3) report depletion layer composition that approaches pure solvent at unexpectedly low shear rates
URI
https://pr.ibs.re.kr/handle/8788114/6283
ISSN
0027-8424
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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