449922 Shifting Isotropic-Nematic Transition in Strongly Confined Semi-Flexible Polymer Solutions

Monday, November 14, 2016: 10:08 AM
Yosemite B (Hilton San Francisco Union Square)
Yeng-Long Chen and Dmytro Luzhbin, Institute of Physics, Academia Sinica, Taipei, Taiwan

We investigated the phase behavior of semi-flexible polymer solutions under sub-persistence length slit confinement of height H.  Strong confinement leads to increased intra-polymer segmental correlation length (l//) in the unconfined dimensions that could reach up to twice the polymer persistence length P.  The increased l// results in better alignment of segments and shifts the isotropic-nematic transition density fIN.  We found that in unconfined systems (H >> P), the dependence of fIN on P follows Onsager theory predictions. Enhanced segmental alignment is also observed near walls. For strongly confined polymer solutions, fIN decreases as H decreases due to the increased segmental correlation length, and enhanced segmental alignment is found throughout the solution.  Qualitative agreements with mean-field theory are found.  The shift in fIN also affects the confined polymer solution dynamics. 

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See more of this Session: Effects of Confinement on Molecular Properties
See more of this Group/Topical: Engineering Sciences and Fundamentals