Rheological microscopy: local mechanical properties from microrheology
We demonstrate how tracer microrheology methods can be extended to study submicron scale variations in the viscoelastic response of soft materials; in particular, a semidilute solution of lambda-DNA. The polymer concentration is depleted near the surfaces of the tracer particles, within a distance c...
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| Veröffentlicht in: | Physical review letters 2003-03, Vol.90 (10), p.108301-108301 |
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| container_title | Physical review letters |
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| creator | Chen, D T Weeks, E R Crocker, J C Islam, M F Verma, R Gruber, J Levine, A J Lubensky, T C Yodh, A G |
| description | We demonstrate how tracer microrheology methods can be extended to study submicron scale variations in the viscoelastic response of soft materials; in particular, a semidilute solution of lambda-DNA. The polymer concentration is depleted near the surfaces of the tracer particles, within a distance comparable to the polymer correlation length. The rheology of this microscopic layer alters the tracers' motion and can be precisely quantified using one- and two-point microrheology. Interestingly, we found this mechanically distinct layer to be twice as thick as the layer of depleted concentration, likely due to solvent drainage through the locally perturbed polymer structure. |
| doi_str_mv | 10.1103/PhysRevLett.90.108301 |
| format | Article |
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| ispartof | Physical review letters, 2003-03, Vol.90 (10), p.108301-108301 |
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| language | eng |
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| source | MEDLINE; American Physical Society Journals |
| subjects | Bacteriophage lambda - genetics DNA, Viral - chemistry Elasticity Fluorescent Dyes - chemistry Microscopy - methods Models, Chemical Polystyrenes - chemistry Rheology - methods Rhodamines - chemistry Viscosity |
| title | Rheological microscopy: local mechanical properties from microrheology |
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