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. 2020 Jul 2;9(7):1606. doi: 10.3390/cells9071606

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Frictional force F_s versus F_n between two mica surfaces across pure water following overnight incubation with HSPC SUVs dispersion (black symbols), where μ ≈ 0.00028 ± 0.00014, and across HA solution (red symbols), where μ ≈ 0.00041 ± 0.00016. (b) Frictional force F_s versus F_n between two mica surfaces across POPC SUVs dispersion following overnight incubation with POPC SUVs dispersion (black symbols) and across POPC-HA mixture (red symbols), where both of them showed μ < 0.0001. The inset shows directly measured shear traces F_s(t) for POPC layer across HA–POPC (2nd trace) and HSPC layer across HA (3rd trace) with similar normal force as a function of applied sliding motion (top trace). The low values of F_s are determined by fast Fourier transform of the shear traces [12].

(a) Frictional force F_s versus F_n between two mica surfaces across pure water following overnight incubation with HSPC SUVs dispersion (black symbols), where μ ≈ 0.00028 ± 0.00014, and across HA solution (red symbols), where μ ≈ 0.00041 ± 0.00016. (b) Frictional force F_s versus F_n between two mica surfaces across POPC SUVs dispersion following overnight incubation with POPC SUVs dispersion (black symbols) and across POPC-HA mixture (red symbols), where both of them showed μ < 0.0001. The inset shows directly measured shear traces F_s(t) for POPC layer across HA–POPC (2nd trace) and HSPC layer across HA (3rd trace) with similar normal force as a function of applied sliding motion (top trace). The low values of F_s are determined by fast Fourier transform of the shear traces [12].