Micro-rheology on (polymer-grafted) colloids using optical tweezers

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Optical tweezers are experimental tools with extraordinary resolution in positioning (+/- 1 nm) a micron-sized colloid and in the measurement of forces (+/- 50 fN) acting on it-without any mechanical contact. This enables one to carry out a multitude of novel experiments in nano- and microfluidics, of which the following will be presented in this review: (i) forces within single pairs of colloids in media of varying concentration and valency of the surrounding ionic solution, (ii) measurements of the electrophoretic mobility of single colloids in different solvents (concentration, valency of the ionic solution and pH), (iii) similar experiments as in (i) with DNA-grafted colloids, (iv) the nonlinear response of single DNA-grafted colloids in shear flow and (v) the drag force on single colloids pulled through a polymer solution. The experiments will be described in detail and their analysis discussed.
Publisher
IOP PUBLISHING LTD
Issue Date
2011-05
Language
English
Article Type
Article
Keywords

DILUTE POLYDISPERSE SYSTEM; INTERACTION POTENTIALS; INTERACTING SPHERES; CHARGED COLLOIDS; DNA; PARTICLES; SUSPENSIONS; SEDIMENTATION; BRUSHES; FORCES

Citation

JOURNAL OF PHYSICS-CONDENSED MATTER, v.23, no.18

ISSN
0953-8984
DOI
10.1088/0953-8984/23/18/184114
URI
http://hdl.handle.net/10203/103432
Appears in Collection
NT-Journal Papers(저널논문)
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