Publications [#348316] of Christoph F. Schmidt
search PubMed.Papers Published
- Schnurr, B; Gittes, F; Olmsted, PD; Schmidt, CF; Mackintosh, FC, Local viscoelasticity of biopolymer solutions,
Materials Research Society Symposium - Proceedings, vol. 463
(January, 1997),
pp. 15-20 .
(last updated on 2024/08/25)Abstract:
We describe a new, high-resolution technique for determining the local viscoelastic response of polymer gels on a micrometer scale. This is done by monitoring thermal fluctuations of embedded probe particles. We derive the relationship between the amplitude of fluctuations and the low-frequency storage modulus G′, as well as the relationship between the fluctuation power spectrum, measured between 0.1 Hz and 25kHz, and the complex shear modulus G(ω). For both, semiflexible F-actin solutions and flexible polyacrylamide (PAAm) gels we observe high-frequency power-law dependence in the spectra, which reflects the behavior of the shear modulus. However, we observe distinctly different scaling exponents for G(ω) in F-actin and PAAm gels - presumably due to the semiflexible nature of the actin filaments.