Flow-Induced Helical Coiling of Semiflexible Polymers in Structured Microchannels

被引：47

作者：

Chelakkot, Raghunath ^{[1
,2
,3
]}

Winkler, Roland G. ^{[1
,2
]}

Gompper, Gerhard ^{[1
,2
]}

机构：

[1] Forschungszentrum Julich, Theoret Soft Matter & Biophys, Inst Complex Syst, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[3] Brandeis Univ, Martin Fisher Sch Phys, Waltham, MA 02453 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 17期

关键词：

MULTIPARTICLE COLLISION DYNAMICS; EQUILIBRIUM; SIMULATION; MIGRATION;

D O I：

10.1103/PhysRevLett.109.178101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The conformations of semiflexible (bio)polymers are studied in flow-through geometrically structured microchannels. Using mesoscale hydrodynamics simulations, we show that the polymer undergoes a rod-to-helix transition as it moves from the narrow high-velocity region into the wide low-velocity region of the channel. The transient helix formation is the result of a nonequilibrium and nonstationary buckling transition of the semiflexible polymer, which is subjected to a compressive force originating from the fluid-velocity variation in the channel. The helix properties depend on the diameter ratio of the channel, the polymer bending rigidity, and the flow strength.

引用

页数：5

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