Entropic Colloidal Interactions in Concentrated DNA Solutions

by: Ritu Verma, JC Crocker, TC Lubensky, AG Yodh

Physical Review Letters, Vol. 81, No. 18. (2 November 1998), 4004.

View FullText article

DOI, PROLA (abstract), PROLA (pdf)

Reviews [Write a review of this article]

There are no reviews of this article

Find related articles from these CiteULike users

hirokiS, weeks

Find related articles with these CiteULike tags

depletion, dna, laser-tweezer, polymer

Abstract

We explore the entropic interactions between a pair of micron-sized colloidal spheres in DNA solutions. By confining the particles in a line-scanned optical tweezer; we directly measured the functional form of the interaction potential with sub- k B T resolution in samples where the spheres and the polymer coils were of comparable size. The potential is well described by the Asakura-Oosawa depletion model even in the semidilute regime where DNA coils overlap strongly. Its range and depth increase with increasing concentration in a manner consistent with a crossover from a dilute solution of Gaussian coils to the weakly fluctuating semidilute regime dominated by two-point collisions which is unique to semiflexible polymers.

@article{citeulike:941006, abstract = {We explore the entropic interactions between a pair of micron-sized colloidal spheres in DNA solutions. By confining the particles in a line-scanned optical tweezer; we directly measured the functional form of the interaction potential with sub- k B T resolution in samples where the spheres and the polymer coils were of comparable size. The potential is well described by the Asakura-Oosawa depletion model even in the semidilute regime where DNA coils overlap strongly. Its range and depth increase with increasing concentration in a manner consistent with a crossover from a dilute solution of Gaussian coils to the weakly fluctuating semidilute regime dominated by two-point collisions which is unique to semiflexible polymers.}, author = {Verma, Ritu and Crocker, J. C. and Lubensky, T. C. and Yodh, A. G. }, citeulike-article-id = {941006}, doi = {10.1103/PhysRevLett.81.4004}, journal = {Physical Review Letters}, keywords = {depletion, laser-tweezer, polymer}, month = {November}, number = {18}, pages = {4004+}, posted-at = {2007-09-27 05:35:16}, priority = {2}, publisher = {American Physical Society}, title = {Entropic Colloidal Interactions in Concentrated DNA Solutions}, url = {http://dx.doi.org/10.1103/PhysRevLett.81.4004}, volume = {81}, year = {1998} }

RIS record

TY - JOUR ID - citeulike:941006 L3 - citeulike-article-id:941006 TI - Entropic Colloidal Interactions in Concentrated DNA Solutions JF - Physical Review Letters VL - 81 IS - 18 SP - 4004 PB - American Physical Society N2 - We explore the entropic interactions between a pair of micron-sized colloidal spheres in DNA solutions. By confining the particles in a line-scanned optical tweezer; we directly measured the functional form of the interaction potential with sub- k B T resolution in samples where the spheres and the polymer coils were of comparable size. The potential is well described by the Asakura-Oosawa depletion model even in the semidilute regime where DNA coils overlap strongly. Its range and depth increase with increasing concentration in a manner consistent with a crossover from a dilute solution of Gaussian coils to the weakly fluctuating semidilute regime dominated by two-point collisions which is unique to semiflexible polymers. KW - depletion KW - laser-tweezer KW - polymer AU - Verma, Ritu AU - Crocker, JC AU - Lubensky, TC AU - Yodh, AG PY - 1998/11/02/ UR - http://dx.doi.org/10.1103/PhysRevLett.81.4004 ER -

RIS BibTeX