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Microscopic Viscoelasticity: Shear Moduli of Soft Materials Determined from Thermal Fluctuations
Open accessAbstract
We describe a high-resolution, high-bandwidth technique for determining the local viscoelasticity of soft materials such as polymer gels. Loss and storage shear moduli are determined from the power spectra of thermal fluctuations of embedded micron-sized probe particles, observed with an interferometric microscope. This provides a passive, small-amplitude measurement of rheological properties over a much broader frequency range than previously accessible to microrheology. We study both F-actin biopolymer solutions and polyacrylamide (PAAm) gels, as model semiflexible and flexible systems, respectively. We observe high-frequency ${\ensuremath{\omega}}^{3/4}$ scaling of the shear modulus in F-actin solutions, in contrast to ${\ensuremath{\omega}}^{1/2}$ scaling for PAAm.
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Cites
Direct observation of kinesin stepping by optical trapping interferometry
Svoboda, K., Schmidt, C. F., Schnapp, B. J., & Block, S. M. (1993) · Nature · doi:10.1038/365721a0 · Cited by 1,910
Self-citation
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Metadata
- Authors
- Gittes, F., Schnurr, B., Olmsted, P. D., MacKintosh, F. C., & Schmidt, C. F.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 1997-10-27
- Volume
- 79
- Issue
- 17
- Pages
- 3286-3289
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2074347711
- Cited by
- 550
- References
- 1
- FWCI
- 20.14
- Type
- journal article
- Language
- en
- Open access
- green
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- Gittes, F., Schnurr, B., Olmsted, P. D., MacKintosh, F. C., & Schmidt, C. F. (1997). Microscopic Viscoelasticity: Shear Moduli of Soft Materials Determined from Thermal Fluctuations. Physical Review Letters. https://doi.org/10.1103/physrevlett.79.3286
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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