Entropic Attraction and Repulsion in Binary Colloids Probed with a Line Optical Tweezer

@article{citeulike:1410887, abstract = {The long-range entropic forces that arise between two micrometer-sized colloidal spheres in a fluid of much smaller colloidal spheres were directly measured using a line-scanned optical tweezer. This new technique allowed us to measure the functional form of the potential with sub- k B T energy and 15 nm spatial resolution. At the lowest small sphere concentrations; the potential was monotonically attractive; while at higher concentrations an oscillatory potential was observed; due to the liquid structure of the small spheres. Surprisingly; the large spheres came together only rarely at the higher concentrations; suggesting a new means for stabilizing suspensions using entropy alone.}, author = {Crocker, J. C. and Matteo, J. A. and Dinsmore, A. D. and Yodh, A. G. }, citeulike-article-id = {1410887}, comment = {journal club 5-17-02, 6-25-07}, doi = {http://dx.doi.org/10.1103/PhysRevLett.82.4352}, journal = {Physical Review Letters}, keywords = {colloids, depletion, journal-club, laser-tweezer}, month = {May}, number = {21}, pages = {4352+}, posted-at = {2007-09-19 14:51:20}, priority = {0}, publisher = {American Physical Society}, title = {Entropic Attraction and Repulsion in Binary Colloids Probed with a Line Optical Tweezer}, url = {http://dx.doi.org/10.1103/PhysRevLett.82.4352}, volume = {82}, year = {1999} }

TY - JOUR ID - citeulike:1410887 L3 - citeulike-article-id:1410887 TI - Entropic Attraction and Repulsion in Binary Colloids Probed with a Line Optical Tweezer JF - Physical Review Letters VL - 82 IS - 21 SP - 4352 PB - American Physical Society N2 - The long-range entropic forces that arise between two micrometer-sized colloidal spheres in a fluid of much smaller colloidal spheres were directly measured using a line-scanned optical tweezer. This new technique allowed us to measure the functional form of the potential with sub- k B T energy and 15 nm spatial resolution. At the lowest small sphere concentrations; the potential was monotonically attractive; while at higher concentrations an oscillatory potential was observed; due to the liquid structure of the small spheres. Surprisingly; the large spheres came together only rarely at the higher concentrations; suggesting a new means for stabilizing suspensions using entropy alone. KW - colloids KW - depletion KW - journal-club KW - laser-tweezer N1 - journal club 5-17-02, 6-25-07 AU - Crocker, JC AU - Matteo, JA AU - Dinsmore, AD AU - Yodh, AG PY - 1999/05/24/ UR - http://dx.doi.org/10.1103/PhysRevLett.82.4352 ER -