Symmetry-breaking phase transitions in highly concentrated semen.

Symmetry-breaking phase transitions in highly concentrated semen.
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DOI:
10.1098/rsif.2016.0575
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发表时间:
2016-10
期刊:
Journal of the Royal Society, Interface
影响因子:
--
通讯作者:
Degond P
Degond P
中科院分区:
其他
文献类型:
--
作者:
Creppy A;Plouraboué F;Praud O;Druart X;Cazin S;Yu H;Degond P

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提出了约束主动悬架自运动的新的实验证据。将新鲜精液样品沉积在环形微流体芯片中导致流体在足够大的精子浓度下的自发涡旋状态。旋转不可预测地顺时针或逆时针发生,并且是稳健和稳定的。此外,对于高活性和高浓度的精液,可能会出现更丰富的动力学,例如自持或阻尼旋转振荡。与系统稀释获得的实验结果提供了一个明确的证据,集体运动的相变与局部对齐的精子类似的Vicsek模型。一个宏观理论的基础上推导出自组织流体动力学模型是适应这种情况下,并提供与所观察到的静止运动相一致的预测。
New experimental evidence of self-motion of a confined active suspension is presented. Depositing fresh semen sample in an annular shaped microfluidic chip leads to a spontaneous vortex state of the fluid at sufficiently large sperm concentration. The rotation occurs unpredictably clockwise or counterclockwise and is robust and stable. Furthermore, for highly active and concentrated semen, richer dynamics can occur such as self-sustained or damped rotation oscillations. Experimental results obtained with systematic dilution provide a clear evidence of a phase transition towards collective motion associated with local alignment of spermatozoa akin to the Vicsek model. A macroscopic theory based on previously derived self-organized hydrodynamics models is adapted to this context and provides predictions consistent with the observed stationary motion.
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