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. Author manuscript; available in PMC: 2023 Dec 11.
Published before final editing as: J Phys Chem Lett. 2022 Jun 8:5285–5290. doi: 10.1021/acs.jpclett.2c00824

Figure 4.

Figure 4.

Increase in pK:H droplet zero-shear viscosity and shear relaxation time by Ficoll70. (A) Measurement of viscoelasticity by oscillating an optically trapped bead inside a settled droplet. (B) Sample traces of the trap position (Xt; green) and trapping force (Ft; raw data, black; fit to a sinusoidal function, red), at 200 g/L Ficoll70. The laser power was given to a single beam and set at 10%. (C) Viscous (G") and elastic (G′) moduli over the frequency range of 0.5 to 40 Hz. Data are for 200 g/L Ficoll70 and presented as mean ± standard error of the mean (N = 6 replicate measurements); curves show fits to the Burgers model. (D) Amplitudes and relaxation times of the shear relaxation moduli at 50 and 200 g/L Ficoll70. Results are presented as fitted value ± standard error of the fit; those at 50 g/L Ficoll70 were published previously 17.