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arXiv 1006.3569cond-mat.softphysics.bio-phphysics.flu-dyn
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支撑膜中夹杂物的相关动力学

Correlated dynamics of inclusions in a supported membrane

Naomi Oppenheimer, Haim Diamant

摘要:

本文将非均相流体膜的流体力学理论推广到固体基底附近的情况。我们推导出的耦合扩散系数对膜夹杂物在大分离的限制相比,夹杂物的大小。二维压应力使耦合系数随粒子间距$r$以$1/r^2$的形式衰减。对于常见的情况下,其中到衬底的距离是亚微米尺度,我们提出的表达式之间的耦合遥远的盘状夹杂物,这是有效的任意夹杂物的大小。我们计算了夹杂物对膜的响应的影响,以及对夹杂物浓度中的耦合扩散系数的相关修正。虽然在短距离的响应被修改,如果膜是一个二维的悬浮液,大距离的响应是不重整化的夹杂物。

英文摘要:

The hydrodynamic theory of heterogeneous fluid membranes is extended to the case of a membrane adjacent to a solid substrate. We derive the coupling diffusion coefficients of pairs of membrane inclusions in the limit of large separation compared to the inclusion size. Two-dimensional compressive stresses in the membrane make the coupling coefficients decay asymptotically as $1/r^2$ with interparticle distance $r$. For the common case, where the distance to the substrate is of sub-micron scale, we present expressions for the coupling between distant disklike inclusions, which are valid for arbitrary inclusion size. We calculate the effect of inclusions on the response of the membrane and the associated corrections to the coupling diffusion coefficients to leading order in the concentration of inclusions. While at short distances the response is modified as if the membrane were a two-dimensional suspension, the large-distance response is not renormalized by the inclusions.

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