Unformatted text preview: tion is 72.93 mJ/m .
a. Plot the data and use the Gibbs adsorption isotherm equation to calculate the surface
excess concentration of SDS, ΓSDS, in molecules per 1000 Å2 for each concentration.
Plot γ vs concentration and find linear regression with intercept=72.93. Slope = 23.295
mJ/m2mM. Then, calculate ΓSDS for each concentration.
( )
( ( )( )( ) ( ) Where c is the concentration of SDS at a particular data point.
See Excel file for data and plot.
b. Plot the spreading pressure, ΠS versus effective area per molecule, a0, and plot the
compressibility factor (ΠS a0/kT) versus spreading pressure for this system. Comment on
the deviation from ideality.
This part of the problem was dropped from the problem set. )...
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 Spring '11
 Moudgil
 EMA4121, Interfacial Engineering, UF, MSE, Surface tension

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