DVS experiments were conducted using a VTI-SA+ instrument (TA Instruments, USA). All samples were dried for 1 h under a stream of nitrogen to reach the equilibrium dry mass. The relative humidity (RH) sequence was varied from 0% to 95% RH with 10% RH increments. The temperature remained constant at 25 ± 0.1 °C. The sorption/desorption isotherms were calculated from the equilibrium mass values.
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