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Collapse and expansion kinetics of a single polyelectrolyte chain with hydrodynamic interactions

Journal of Chemical Physics, ISSN: 1089-7690, Vol: 160, Issue: 16
2024
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University of Tokyo Researcher Has Published New Study Findings on Chemical Physics (Collapse and expansion kinetics of a single polyelectrolyte chain with hydrodynamic interactions)

2024 MAY 10 (NewsRx) -- By a News Reporter-Staff News Editor at Chemicals & Chemistry Daily Daily -- Researchers detail new data in chemical physics.

Article Description

We investigate the collapse and expansion dynamics of a linear polyelectrolyte (PE) with hydrodynamic interactions. Using dissipative particle dynamics with a bead-spring PE model, long-range electrostatics, and explicit ions, we examine how the timescales of collapse t and expansion t depend on the chain length N and obtain scaling relationships t ∼ N and t ∼ N. For neutral polymers, we derive values of α = 0.94 ± 0.01 and β = 1.97 ± 0.10. Interestingly, the introduction of electrostatic interaction markedly shifts α to α ≈ 1.4 ± 0.1 for salt concentrations within c = 10 to 10 M. A reduction in the ion-to-monomer size ratio noticeably reduces α. On the other hand, the expansion scaling remains approximately constant, β ≈ 2, regardless of the salt concentration or ion size considered. We find β > α for all conditions considered, implying that expansion is always slower than collapse in the limit of long polymers. This asymmetry is explained by distinct kinetic pathways of collapse and expansion processes.

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