<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Extension of BET theory to CO2 adsorption isotherms for ultra-microporosity of covalent organic polymers"^^ . "Usually, nitrogen and argon adsorption�desorption isotherms are used at their respective boiling points for the determination of specific surface area via the BET theory of microporous materials. However, for ultra-micropores, where nitrogen and argon cannot access at cryogenic temperatures, the CO2 adsorption�desorption isotherms have been considered as alternative options for the determination of specific surface area by extending BET theory, but the surface area determined by using CO2 adsorption�desorption isotherms is not significant due to strong CO2-CO2 interactions. In this study, the microporous covalent organic polymers are subjected to nitrogen and CO2 adsorption�desorption isotherms and the results showed that a clear linear region is available in isotherms, which confirms the presence of ultra-micropores. The surface area determined by the CO2 adsorption�desorption isotherms is higher than the surface area determined by N2 adsorption�desorption isotherms. These results indicate that the microporous covalent organic polymers contain ultra-micropores where only CO2 can reach, while nitrogen and argon cannot access at cryogenic conditions because their kinetic diameter is larger than CO2. © 2020, Springer Nature Switzerland AG."^^ . "2020" . . "2" . "7" . . "Springer Nature"^^ . . . "SN Applied Sciences"^^ . . . "25233971" . . . . . . . . . . . . . . . . . . . "M.A."^^ . "Bustam"^^ . "M.A. Bustam"^^ . . "N."^^ . "Mellon"^^ . "N. Mellon"^^ . . "A."^^ . "Mukhtar"^^ . "A. Mukhtar"^^ . . "S."^^ . "Saqib"^^ . "S. Saqib"^^ . . "S.-P."^^ . "Lee"^^ . "S.-P. Lee"^^ . . . . . "HTML Summary of #12925 \n\nExtension of BET theory to CO2 adsorption isotherms for ultra-microporosity of covalent organic polymers\n\n" . "text/html" . .