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- W2103997543 abstract "The frequency-dependent shear modulus and viscosity of suspensions of charged liposomes were measured by use of an oscillating optical trap. Deionized suspensions of extruded 100 nm unilamellar liposomes composed of PG:PC mixtures form electrostatically-stabilized gels. A 1.5 μm polystyrene probe particle is suspended in the gel, trapped by optical tweezers, and the trap is oscillated over a frequency range ω = 1-1000 Hz. The relative displacement and phase of the probe in the trap yield the complex response function G(ω), whose real and imaginary parts G′(ω) and G″(ω) are the storage and loss moduli, respectively, which are related to the shear modulus and viscosity of the gel. The dependence of shear modulus on liposome charge can thus be measured. For PG:PC 1:5 (mol:mol) liposomes at 12% volume fraction, we find G′(ω) ∼ 1000 dyne/cm2 over the entire frequency range. This result is consistent with earlier measurements on similar liposome suspensions by an oscillating bobbin technique and is comparable to the shear moduli of colloidal crystals composed of polystyrene spheres of similar size at similar volume fractions. Given the polydispersity of the liposomes (Δr/r ∼ 0.3) compared to that of the polystyrene spheres (Δr/r ∼ 0.02), the liposome suspension is surprisingly rigid. We use the analysis of Joanny (1979) with Poisson-Boltzmann potentials to relate the shear modulus of the liposome gel to the average liposome charge. Such measurements offer a new way to determine the charge of liposomes, biological vesicles, and other nanoparticles." @default.
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- W2103997543 date "2012-01-01" @default.
- W2103997543 modified "2023-10-16" @default.
- W2103997543 title "Shear Modulus and Viscosity of Deionized Suspensions of Charged Liposomes" @default.
- W2103997543 doi "https://doi.org/10.1016/j.bpj.2011.11.555" @default.
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