Abstract: The comprehension and analysis of adsorption isotherms constitute a fundamental aspect of research in physical chemistry, materials chemistry, and porous materials characterization. While the classical six types of adsorption isotherms remain effective for evaluating the pore characteristics of rigid porous materials, the emergence of flexible porous materials have introduced new complexities. These materials exhibit dynamic responses such as gate-opening, multi-step opening, pore collapse, or negative gas adsorption upon guest induction, posing new challenges for specific surface area calculation, pore size distribution prediction, and performance evaluation. Considering issues in current teaching, such as outdated content on adsorption isotherms and insufficient integration of cutting-edge cases on dynamic adsorption behavior, this paper systematically reviews the key features of new types of adsorption isotherms, pore characterization methodologies, and relevant research applications. By incorporating these advancements into classroom instruction and experimental teaching, this work aims to broaden students' understanding of emerging adsorption isotherms, acquaint them with contemporary research trends, and foster their interest in scientific inquiry.

Key words: Adsorption isotherm, Pore type, Pore-opening adsorption, Pore evaluation, Teaching reform