Depletion layer dynamics of polyelectrolyte solutions under Poiseuille flow

Proceedings of the National Academy of Sciences of the United States of America
Seong Jun ParkJohn T King

Abstract

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.

References

Jan 26, 2002·Science·Abraham D StroockGeorge M Whitesides
Aug 9, 2003·Physical Review Letters·Richard M JendrejackJuan J de Pablo
Jul 23, 2004·The Journal of Chemical Physics·Richard M JendrejackMichael D Graham
May 17, 2005·Biophysical Journal·M Abkarian, A Viallat
Aug 11, 2005·Physical Review Letters·Charles M SchroederSteven Chu
Jul 1, 1959·Proceedings of the National Academy of Sciences of the United States of America·D F Bradley, M K Wolf
Jun 29, 2006·Physical Review Letters·Rajesh KhareJuan J de Pablo
Oct 19, 2006·Proceedings of the National Academy of Sciences of the United States of America·Derek SteinCees Dekker
May 26, 2007·Science·Stefan W Hell
Aug 11, 1995·Science·J Klein, E Kumacheva
Jan 17, 2008·Chemical Society Reviews·Brandi L SchottelKim R Dunbar
Oct 11, 2008·Nature Biotechnology·Daniel BrantonJeffery A Schloss
Dec 29, 2011·Proceedings of the National Academy of Sciences of the United States of America·Huimin ChenLois Pollack
Sep 26, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Adelene Y L SimSebastian Doniach
Sep 9, 2016·Nature·Eleonora SecchiLydéric Bocquet
May 4, 2017·Proceedings of the National Academy of Sciences of the United States of America·David R JacobsonOmar A Saleh

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