5 November 2010 Microrheology of sodium polystyrene sulfonate (NaPSS) solutions with different polymer concentrations and molecular weights studied by diffusing wave spectroscopy
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Proceedings Volume 7848, Holography, Diffractive Optics, and Applications IV; 78480H (2010); doi: 10.1117/12.870005
Event: Photonics Asia 2010, 2010, Beijing, China
Abstract
In this paper, we report the viscoelastic properties of sodium polystyrene sulfonate (NaPSS) solution with different concentrations (in the range of 10-4 M to 10-3 M) and with different molecular weights (70 kDa vs. 200 kDa) investigated via Diffusing Wave Spectroscopy (DWS). The viscoelastic properties of the sample solutions are characterized in terms of the elastic modulus G' and the viscous modulus G" as a function of frequency (f), and also in terms of the polymer disentanglement time (τ); the effect of polymer concentration and molecular weight on these parameters are presented. Our experimental results indicate that (1) both the viscous modulus G" and the disentanglement time (τ) increase with molecular concentration, whereas the elastic modulus G' is relatively insensitive to molecular concentration, and (2) for the same concentration, all the 3 parameters (i.e., the elastic modulus G', the viscous modulus G", and disentanglement time τ) increase as the molecular weight increases.
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Yin-Quan Chen, Chen-Yu Cheng, Chia-Chun Chiang, Ming-Tzo Wei, Yi-Chiao Huang, Olivier Lavastre, Husson Guillaume, Darsy Guillaume, Arthur Chiou, "Microrheology of sodium polystyrene sulfonate (NaPSS) solutions with different polymer concentrations and molecular weights studied by diffusing wave spectroscopy", Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 78480H (5 November 2010); doi: 10.1117/12.870005; https://doi.org/10.1117/12.870005
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KEYWORDS
Polymers

Spectroscopy

Sodium

Molecular spectroscopy

Microfluidics

Fluid dynamics

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