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Swelling and shrinking kinetics of a lamellar gel phase
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View: Figures


Image of FIG. 1.
FIG. 1.

Swelling of lamellar phase with an initial total surfactant concentration . To illustrate the square-root growth behavior, images at times , 1, 4, 9, 16, 25, 36, 49, and (left to right) are shown. The right-most image is the digitized version used for the analysis.

Image of FIG. 2.
FIG. 2.

Nonequilibrium diagram in the initial total surfactant concentration -polymer concentration plane indicating the compositions of samples that swell (upwards triangles) or shrink (downwards triangles). Solid circles indicate where no change in volume is expected, based on data in Fig. 4. The solid line represents the fitted boundary [Eq. (1)]. The right hand axis indicates the osmotic pressure of the polymer solution .

Image of FIG. 3.
FIG. 3.

Change in sample height as a function of time since contact for lamellar phase (initial total surfactant concentration ) contacted with polymer solutions with concentration , 0.3, 4.9, 7.6, 10.0, and , top to bottom. The solid lines are fits for the swelling coefficients : data up to were used, but only early times are shown.

Image of FIG. 4.
FIG. 4.

Measured swelling coefficients as a function of polymer concentration . The lines are fits with as the only free parameter. Symbols and lines are for initial total surfactant concentration , blue, crosses, solid line, for 12%, red, hollow squares, dashed line and for 24%, green, filled triangles, dash-dotted line. Solid circles show estimate of where each data-set cross the axis, with thick horizontal lines indicating uncertainties. The inset shows the same values of plotted against the velocity coefficient , where is the relative supersaturation [Eqs. (3) and (4)]. The best fit line has a negative slope of . Samples contacted with pure water are indicated by arrows.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Swelling and shrinking kinetics of a lamellar gel phase