Studies of the LB Deposition Process

A monolayer of Streptavidin containing 1.75 mg of protein/m gives a film pressure of 0.070 erg/m at 15°C. Calculate the molecular weight of the protein, assuming ideal-gas behavior. 

Describe situations that might result in the four types of isotherms shown in Fig-XV-3. 

Show under what limiting condition Eqs. XV-8 and XV-17 become the same. 

At what molecular area should a fatty-acid film spread on 0.05A/ NaOH have a film pressure of 4 dyn/cm, according to the Donnan treatment and to the Gouy treatment Assume the hydrocarbon part of the film to behave as an ideal gas. Assume 20°C. 

Davies [114] found that the rates of desorption of sodium laurate and of lauric acid films were in the ratio 6.70 1 at 21.5°C at molecular areas of 90 and 60 per molecule, respectively. Calculate o. the potential at the plane CD in Fig. XV-12. 

---