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Nanorheology of active–passive polymer mixtures differentiates between linear and ring polymer topology
Soft Matter ( IF 3.4 ) Pub Date : 2021-07-07 , DOI: 10.1039/d1sm00665g
Andrea Papale 1 , Jan Smrek 2 , Angelo Rosa 1
Affiliation  

We study the motion of dispersed nanoprobes in entangled active–passive polymer mixtures. By comparing the two architectures of linear vs. unconcatenated and unknotted circular polymers, we demonstrate that novel, rich physics emerge. For both polymer architectures, nanoprobes of size smaller than the entanglement threshold of the solution move faster as activity is increased and more energy is pumped in the system. For larger nanoprobes, a surprising phenomenon occurs: while in linear solutions they move qualitatively as before, in active–passive ring solutions nanoprobes decelerate with respect to the purely passive conditions. We rationalize this effect in terms of the non-equilibrium, topology-dependent association (clustering) of nanoprobes to the cold component of the ring mixture reminiscent of the recently discovered [Weber et al., Phys. Rev. Lett., 2016, 116, 058301] phase separation in scalar active–passive mixtures. We conclude with a potential connection to the microrheology of the chromatin in the nuclei of the cells.

中文翻译:

主动-被动聚合物混合物的纳米流变学区分线性和环状聚合物拓扑结构

我们研究了分散的纳米探针在缠结的主动-被动聚合物混合物中的运动。通过比较线性线性的两种架构。未连接和未打结的圆形聚合物,我们证明了新颖、丰富的物理学出现。对于这两种聚合物结构,尺寸小于溶液缠结阈值的纳米探针随着活性的增加和系统中泵送的能量增加而移动得更快。对于较大的纳米探针,会出现一个令人惊讶的现象:虽然在线性溶液中它们像以前一样定性移动,但在主动-被动环溶液中,纳米探针相对于纯被动条件减速。我们根据纳米探针与环混合物的冷成分的非平衡、拓扑相关关联(聚类)来合理化这种影响,这让人想起最近发现的 [Weber et al. 物理。牧师莱特。, 2016, 116, 058301] 标量主动-被动混合物中的相分离。我们得出与细胞核中染色质微流变学的潜在联系的结论。
更新日期:2021-07-13
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