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Transition from Newtonian to non-Newtonian surface shear viscosity of phospholipid monolayers
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the annular deep-channel surface viscometer and data acquisition system.

Image of FIG. 2.
FIG. 2.

Measured equation of state for DPPC on pure water in terms of surface pressure (reduction in the surface tension from that of a clean surface, about 72.3 dyne/cm at 22 °C) and area coverage. The BAM images, obtained at 45× magnification using an objective with NA = 0.28 (resolving power of 1.1 μm), show co-existing LE/LC phase domains in the intermediate range of monolayer concentration.

Image of FIG. 3.
FIG. 3.

Comparison between our measured equation of state (shown in Fig. 2 ) with data from the literature.

Image of FIG. 4.
FIG. 4.

Non-dimensionalized surface azimuthal velocity profile as measured in our apparatus using conventional particle tracking and cross correlated BAM images for and Π = 5 dyne/cm. For all BAM measurements presented here and in Figs. 5 and 6 , the magnification was 7× with resolving power of 3 μm.

Image of FIG. 5.
FIG. 5.

Azimuthal velocity profiles at the air/water surface for = 100; the experimentally measured profiles are shown as symbols at the surface pressures Π as indicated; the corresponding area per molecule are 0.79 nm, 0.54 nm, 0.51 nm, 0.48 nm, and 0.45 nm. The lines are computed profiles with non-dimensional surface shear viscosity μ as indicated.

Image of FIG. 6.
FIG. 6.

Same as in Fig. 5 , except for = 600.

Image of FIG. 7.
FIG. 7.

Surface shear viscosity of DPPC, μ, as determined from flows at = 100 and = 600, versus surface pressure Π. Also shown are μ from other experimental measurements.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Transition from Newtonian to non-Newtonian surface shear viscosity of phospholipid monolayers