Q1

a. There are six different types of gas adsorption isotherms. The six categories of isotherm (IUPAC classification) distinguish microporous (type I), nonporous or macroporous (types II, III, and VI), and mesoporous (type VII) adsorbents (types IV and V). Illustrate at least 5 types with the aid of diagrams. (20 marks)

b. The effects on polymer addition to the mixture of colloidal particles has been widely reported. With the aid of a diagram, demonstrate the role of adsorbing and nonadsorbing polymers in colloidal stability. (10 marks)