PHC320H1 Lecture Notes - Lecture 7: Desorption, Dosage Form, Partial Pressure

• School: UTSG
• Department: Pharmaceutical Chemical Engineering and Applied Chemistry
• Course: PHC320H1
• Professor: Shirley Wu

Document Summary

Gives us a tool to predict if given solute is added to system with two phases (oil: water) and water:air will accumulate at interface or move away. So, we talk about positive or negative adsorption. Then, we started talking about adsorption at solid interfaces. Then, we talked about gas-solid interfaces, and we mentioned that there are two types of adsorption that can take place at gas-solid interfaces: physical adsoprtion. Weak van der waals interaction between absorbed gas and solid: chemical adsoprtion. Formation of covalent bonds between gas and solid. When, we deal with physical adsorption, we want to understand how much gas will be adsorbed on the surface of the solid. In this respect, we need to know only two parameters, to calculate the amount of adsorbed gas at any partial pressure: The max. amount that can be adsorbed before we have saturation.