Polyelectrolyte-Compression Forces between Spherical DNA Brushes

by: Kati Kegler, Martin Konieczny, Gustavo D Espinosa, Christof Gutsche, Matthias Salomo, Friedrich Kremer, Christos N Likos

Physical Review Letters, Vol. 100, No. 11. (2008)

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Abstract

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.

@article{citeulike:2767397, abstract = {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.}, author = {Kegler, Kati and Konieczny, Martin and Espinosa, Gustavo D. and Gutsche, Christof and Salomo, Matthias and Kremer, Friedrich and Likos, Christos N. }, citeulike-article-id = {2767397}, doi = {10.1103/PhysRevLett.100.118302}, journal = {Physical Review Letters}, keywords = {biology, colloids, interaction, opticaltweezer}, number = {11}, posted-at = {2008-05-07 22:18:09}, priority = {2}, publisher = {APS}, title = {Polyelectrolyte-Compression Forces between Spherical DNA Brushes}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000100000011118302000001\&idtype=cvips\&gifs=yes}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2767397 TI - Polyelectrolyte-Compression Forces between Spherical DNA Brushes JF - Physical Review Letters VL - 100 IS - 11 PB - APS N2 - 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. KW - biology KW - colloids KW - interaction KW - opticaltweezer AU - Kegler, Kati AU - Konieczny, Martin AU - Espinosa, Gustavo AU - Gutsche, Christof AU - Salomo, Matthias AU - Kremer, Friedrich AU - Likos, Christos PY - 2008/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000100000011118302000001&idtype=cvips&gifs=yes ER -

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