To further confirm that co-adsorbed VOCs diffuse independently in ZIF-8, the multi-analyte measurements were analyzed using the Maxwell-Stefan model, which describes binary mixture diffusion based on three diffusivity terms. Two of these terms indicate the interaction of the diffusing molecules with the porous framework, and the third reflects interaction effects between the mixture components (SI Note 1, SI Table ) . When interactions between the diffusing molecules occur, the interaction term becomes smaller than the diffusivities of the individual components. In contrast, in our case, the interaction term is 500 times and 5 times larger than the slowest component in the acetone-hexane and 1-propanol-1-butanol mixtures, respectively, which indicates that the diffusion of each VOC is practically unaffected by the presence of the other component. This result can be rationalized based on the framework topology of ZIF-8, which consists of cages separated by narrow windows. The diffusion rate through the pores is determined by molecules jumping through these windows one at a time, while molecules can easily pass each other in the cages .