Polyelectrolyte-compression forces between spherical DNA brushes

被引：45

作者：

Kegler, Kati ^{[1
]}

Konieczny, Martin ^{[2
]}

Dominguez-Espinosa, Gustavo ^{[1
]}

Gutsche, Christof ^{[1
]}

Salomo, Matthias ^{[1
]}

Kremer, Friedrich ^{[1
]}

Likos, Christos N. ^{[2
,3
]}

机构：

[1] Univ Leipzig, Inst Expt Phys 1, D-04103 Leipzig, Germany

[2] Univ Dusseldorf, Inst Theoret Phys 2 Soft Matter, D-40225 Dusseldorf, Germany

[3] Erwin Schrodinger Int Inst Math Phys, A-1090 Vienna, Austria

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.100.118302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Optical tweezers are employed to measure the forces of interaction within a single pair of DNA-grafted colloids, dependent on the molecular weight of the DNA chains, and the concentration and valence of the surrounding ionic medium. The resulting forces are short range and set in as the surface-to-surface distance between the colloidal cores reaches the value of the brush height. The measured force-distance relation is analyzed by means of a theoretical treatment that quantitatively describes the effects of compression of the chains on the surface of the opposite-lying colloid. Quantitative agreement with the experiment is obtained for all parameter combinations.

引用

页数：4

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