Hydrodynamic interactions in two dimensions

被引：37

作者：

Di Leonardo, R. ^{[1
]}

Keen, S. ^{[2
]}

Ianni, F. ^{[1
,3
]}

Leach, J. ^{[2
]}

Padgett, M. J. ^{[2
]}

Ruocco, G. ^{[1
,3
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, CNR, INFM,CRS SOFT, I-00185 Rome, Italy

[2] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[3] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW E | 2008年 / 78卷 / 03期

关键词：

D O I：

10.1103/PhysRevE.78.031406

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We measure hydrodynamic interactions between colloidal particles confined in a thin sheet of fluid. The reduced dimensionality, compared to a bulk fluid, increases dramatically the range of couplings. Using optical tweezers we force a two body system along the eigenmodes of the mobility tensor and find that eigenmobilities change logarithmically with particle separation. At a hundred radii distance, the mobilities for rigid and relative motions differ by a factor of 2, whereas in bulk fluids, they would be practically indistinguishable. A two dimensional counterpart of Oseen hydrodynamic tensor quantitatively reproduces the observed behavior, once the relevant boundary conditions are recognized. These results highlight the importance of dimensionality for transport and interactions in colloidal systems and proteins in biological membranes.

引用

页数：4

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