Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 10, 2022 | Supplemental Material
Journal Article Open

Mechanisms of Flow-Induced Polymer Translocation


Flow-induced translocation of linear and ring polymers is studied by using a combination of multiparticle collision dynamics and molecular dynamics. The results show that both end capture and fold capture are present in the capture process of linear chains in weak flows, whereas fold capture becomes dominant in strong flows, resulting in similar behavior for the linear and ring chains in the strong flow regime. For narrow channels, the critical flux decreases with the increase of channel size, which is qualitatively consistent with the prediction by Wu et al.; for large channel sizes (which are still smaller than the polymer size), the critical flux is independent of channel size, in agreement with an earlier prediction by de Gennes et al. The presence of these two scaling regimes indicates that the confined blob exhibits a crossover from free draining to nondraining as the channel size increases. Moreover, we found that the conformation of the polymer exhibits a flow-induced coil–compact–stretch transition, and the transition does not appear to be first order. In addition, we observed that the monomers far from the channel and in the channel exhibit independent dynamics.

Additional Information

© 2022 American Chemical Society. Received 11 February 2022. Revised 11 April 2022. Published online 27 April 2022. Published in issue 10 May 2022. We thank Professor Lianwei Li (Shenzhen University) for valuable discussions. This work was supported by the Science Challenge Project (Grant TZ2018004), the National Key R&D Program of China (Grant 2020YFA0713601), the National Natural Science Foundation of China (Grants 21790340 and 22073092), and the Key Research Program of Frontier Sciences, CAS (Grant QYZDY-SSW-SLH027). Additional support for Y.L. was provided by the Youth Innovation Promotion Association of CAS (Grant Y202054). The authors declare no competing financial interest.

Attached Files

Supplemental Material - ma2c00288_si_001.pdf

Supplemental Material - ma2c00288_si_002.mp4

Supplemental Material - ma2c00288_si_003.mp4

Supplemental Material - ma2c00288_si_004.mp4

Supplemental Material - ma2c00288_si_005.mp4


Files (15.6 MB)
Name Size Download all
3.9 MB Download
3.4 MB Download
3.4 MB Download
3.1 MB Download
1.7 MB Preview Download

Additional details

August 22, 2023
October 24, 2023