Globule–stretch transition of a self-attracting chain in the repulsive active particle bath

Xia, Yiqi; Tian, Wen‐de; Chen, Kang; Ma, Yu‐qiang

doi:10.1039/c8cp05976d

Cited by 21 publications

(9 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We used a standard bead-and-spring model, which includes elastic springs connecting consecutive beads and a Weeks-Chandler-Anderson (WCA) potential to mimic steric interactions among monomers. Similar to our previous studies, ,− each bead has an intrinsic orientation, û (see Figure ). The active force exerted on each bead is F a = F û where F is a constant magnitude.…”

Section: Model and Methodssupporting

confidence: 62%

Desorption of a Flexible Polymer with Activity from a Homogeneous Attractive Surface

Feng

Tian

2023

Macromolecules

Self Cite

View full text Add to dashboard Cite

The interfacial behavior of a flexible polymer with activity, which is named active Brownian polymer (ABPO), is studied by Langevin dynamics simulations. On the dependence of the adsorption strength and activity characterized by the Pećlet number (Pe), the polymer displays two typical states on the surface: adsorption and desorption states. We find that the diffusion behavior of ABPO that is parallel to the surface yields the "active Rouse model" and the activity causes the adsorption− desorption transition at a certain adsorption strength. Particular attention is given to how the desorption time, τ des , changes with the activity. At intermediate activity, τ des displays an exponential decay with the inverse of the effective temperature, T eff ∝1 + Pe 2 /18, which is reminiscent of the mechanism of thermal activation. At higher activity, due to easily overcoming the attractive energy barrier, τ des ∝Pe −1 is found. At lower activity, a power-law dependence of τ des on the diffusion coefficient perpendicular to the surface (D ⊥ ) is observed (τ des ∼D ⊥ −1.28 ). Further, we observed a non-monotonic dependence of desorption time on the rotation diffusion coefficient D R of the monomer and found that τ des exists on a scaling relation with the chain length N, τ des ∼ N ϕ , and the scaling exponent ϕ decreases with the increase of activity. Our results highlight that the activity can be used to regulate the polymer adsorption and desorption behavior.

show abstract

Section: Model and Methodssupporting

confidence: 62%

Desorption of a Flexible Polymer with Activity from a Homogeneous Attractive Surface

Feng

Tian

2023

Macromolecules

Self Cite

View full text Add to dashboard Cite

show abstract

“…Already systems of ABPs mixed with passive colloids exhibit phase separation 235,245,246 and a collective interface dynamics. 235 Passive semiflexible polymers embedded in an active bath of ABPs exhibit novel transient states in 2D, 151,[247][248][249] where an activity-induced bending of the polymers implies an asymmetric exposure to active particles, with ABPs accumulating in regions of highest curvature, as has been observed for ABPs in confinement. 250 This leads to particular polymer conformations such as hairpins, structures which are only temporarily stable and dissolve and rebuild in the course of time.…”

Section: Discussionmentioning

confidence: 92%

The physics of active polymers and filaments

Winkler,

Gompper

2020

Preprint

View full text Add to dashboard Cite

Active matter agents consume internal energy or extract energy from the environment for locomotion and force generation. Already rather generic models, such as ensembles of active Brownian particles, exhibit phenomena, which are absent at equilibrium, in particular motility-induced phase separation and collective motion. Further intriguing nonequilibrium effects emerge in assemblies of bound active agents as in linear polymers or filaments. The interplay of activity and conformational degrees of freedom gives rise to novel structural and dynamical features of individual polymers as well as in interacting ensembles. Such outof-equilibrium polymers are an integral part of living matter, ranging from biological cells with filaments propelled by motor proteins in the cytoskeleton, and RNA/DNA in the transcription process, to long swarming bacteria and worms such as Proteus mirabilis and Caenorhabditis elegans, respectively. Even artificial active polymers have been synthesized. The emergent properties of active polymers or filaments depend on the coupling of the active process to their conformational degrees of freedom, aspects which are addressed in this article. The theoretical models for tangentially and isotropically self-propelled or active-bath driven polymers are presented, both in presence and absence of hydrodynamic interactions. The consequences for their conformational and dynamical properties are examined, emphasizing the strong influence of the coupling between activity and hydrodynamic interactions. Particular features of emerging phenomena, induced by steric and hydrodynamic interactions, are highlighted. Various important, yet theoretically unexplored, aspects are featured and future challenges are discussed.

show abstract

“…A study of APs links the knowledge of polymer physics to the nonequilibrium and nonlinear physics of active matter, [8][9][10] and hence has attracted much research interest. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Several theoretical and simulation models of APs, addressing the propulsion in different ways, have been developed. [11][12][13]15,28 And unusual configurations and self-assembling behaviors have been revealed based on these models.…”

Section: Introductionmentioning

confidence: 99%