10.1021/jp5118085.s001
Hiromitsu Ito
Hiromitsu
Ito
Taku Iiyama
Taku
Iiyama
Sumio Ozeki
Sumio
Ozeki
Kinetics
of Cluster-Mediated Filling of Water Molecules
into Carbon Micropores
American Chemical Society
2015
ACF
outgassing flow rates
adsorption rate constants
pore width
water vapor adsorption kinetics
novel pressure feedback method
water adsorption process
PFM
2015-02-26 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Kinetics_of_Cluster_Mediated_Filling_of_Water_Molecules_into_Carbon_Micropores/2192248
Understanding
the kinetics of water adsorption/desorption on activated
carbon is significant for chemical applications in which competitive
adsorption of water occurs. In this study, we investigated the water
adsorption process by determining the adsorption rate constant using
the novel pressure feedback method (PFM), which measures the rate
of adsorption directly with high precision (∼10 nmol s<sup>–1</sup>) by controlling the introducing and outgassing flow
rates. The PFM was used to investigate water vapor adsorption kinetics
on activated carbon fibers (ACFs) of different pore sizes and to obtain
a correlation of rate constant with pore size. The systems show good
agreement with the stretched exponential model. The adsorption rate
constants were found to be lower for ACFs with a larger pore width
(average pore width; <i>w</i> = 1.03 nm) as compared with
those for smaller pore systems (<i>w</i> = 0.57, 0.72 nm).