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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8847–8854

Optical tweezers based active microrheology of sodium polystyrene sulfonate (NaPSS)

Chia-Chun Chiang, Ming-Tzo Wei, Yin-Quan Chen, Pei-Wen Yen, Yi-Chiao Huang, Jun-Yeh Chen, Olivier Lavastre, Husson Guillaume, Darsy Guillaume, and Arthur Chiou  »View Author Affiliations

Optics Express, Vol. 19, Issue 9, pp. 8847-8854 (2011)

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We used oscillatory optical tweezers to investigate the microrheological properties of Sodium polystyrene sulfonate (NaPSS; Mw = 70kDa) polymer solutions with different concentrations from 0.001mM to 10mM in terms of elastic modulus G’(ω) and loss modulus G”(ω) as a function of angular frequency (ω) in the range of 6rad/s to 6000rad/s. The viscoelastic properties (including zero-shear-rate viscosity, crossing frequency and transition frequency) as a function of polymer concentration, deduced from our primary data, reveal the subtle structural changes in the polymer solutions as the polymer concentration increases from dilute to semi-dilute regimes, passing through the critical micelle formation concentration and the polymer overlapping concentration. The experimental results are consistent with the Maxwell model in some regime, and with the Rouse model in other, indicating the transient network character and the micelles formation in different regimes.

© 2011 OSA

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(160.5470) Materials : Polymers
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: March 1, 2011
Revised Manuscript: April 7, 2011
Manuscript Accepted: April 18, 2011
Published: April 21, 2011

Virtual Issues
Vol. 6, Iss. 5 Virtual Journal for Biomedical Optics

Chia-Chun Chiang, Ming-Tzo Wei, Yin-Quan Chen, Pei-Wen Yen, Yi-Chiao Huang, Jun-Yeh Chen, Olivier Lavastre, Husson Guillaume, Darsy Guillaume, and Arthur Chiou, "Optical tweezers based active microrheology of sodium polystyrene sulfonate (NaPSS)," Opt. Express 19, 8847-8854 (2011)

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