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首页> 外文期刊>The Journal of Chemical Physics >Steady state sedimentation of ultrasoft colloids
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Steady state sedimentation of ultrasoft colloids

机译：超高速胶体的稳态沉降

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The structural and dynamical properties of ultra-soft colloids-star polymers-exposed to a uniform external force field are analyzed by applying the multiparticle collision dynamics technique, a hybrid coarse-grain mesoscale simulation approach, which captures thermal fluctuations and long-range hydrodynamic interactions. In the weak-field limit, the structure of the star polymer is nearly unchanged; however, in an intermediate regime, the radius of gyration decreases, in particular transverse to the sedimentation direction. In the limit of a strong field, the radius of gyration increases with field strength. Correspondingly, the sedimentation coefficient increases with increasing field strength, passes through a maximum, and decreases again at high field strengths. The maximum value depends on the functionality of the star polymer. High field strengths lead to symmetry breaking with trailing, strongly stretched polymer arms and a compact star-polymer body. In the weak-field-linear response regime, the sedimentation coefficient follows the scaling relation of a star polymer in terms of functionality and arm length. Published by AIP Publishing.
机译：通过施加多粒碰撞动力学技术，通过捕获热波动和远程流体动力学相互作用来分析超软胶体 - 星聚合物的超软胶体 - 星形聚合物的结构和动力学性能。捕获热波动和远程流体动力学相互作用。在弱场限制中，星形聚合物的结构几乎保持不变;然而，在中间方案中，旋转半径降低，特别是横向于沉降方向。在一个强场的极限中，陀螺率随着场强的增加而增加。相应地，沉降系数随着场强的增加而增加，通过最大值，并且在高场强度下再次降低。最大值取决于星形聚合物的功能。高场强导致对称性断裂，尾随，强烈拉伸的聚合物臂和紧凑的星形聚合物体。在弱场 - 线性响应方案中，沉降系数遵循恒星聚合物在功能性和臂长的缩放关系。通过AIP发布发布。

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