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(a) Describe in detail three main methods of multilayer preparation and define most reproducible method (explain your answer). (7 marks) (b) The CHI/PAA multilayer growth
(a) Describe in detail three main methods of multilayer preparation and define most reproducible method (explain your answer). (7 marks) (b) The CHI/PAA multilayer growth in 0.1MKCl at 37C is characterized by the transition point at 12 bilayers. (i) Why does this occur and how is it related to polymer adsorption per a deposition step? (4 marks) (ii) Sketch the graph showing how the multilayer thickness depends on the number of bilayers. Show on the graph how the increase of CaCl2 concentration affects the position of the transition point? (3 marks) (c) Multiplayer capsules of poly(styrene sulfonate) (PSS, pKa 1.0) and poly(allylamine) (PAH, pKa 8.0) are assembled at a pH of 1. Describe the mechanism, with the aid of schematics, for the encapsulation of molecules through changes in pH. (10 marks) (d) Draw the scheme of protein encapsulation into multilayer capsules using mesoporous vaterite CaCO3 crystals. Explain all steps required for encapsulation. (6 marks)
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