Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon

Horikawa, Toshihide, Muguruma, Takahiro, Do, D. D., Sotowa, Ken-Ichiro and Alcántara-Avila, J. Rafael (2015) Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon. Carbon, 95 137-143. doi:10.1016/j.carbon.2015.08.034


Author Horikawa, Toshihide
Muguruma, Takahiro
Do, D. D.
Sotowa, Ken-Ichiro
Alcántara-Avila, J. Rafael
Title Scanning curves of water adsorption on graphitized thermal carbon black and ordered mesoporous carbon
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2015-10-11
Sub-type Article (original research)
DOI 10.1016/j.carbon.2015.08.034
Open Access Status Not Open Access
Volume 95
Start page 137
End page 143
Total pages 7
Place of publication Kidlington, United Kingdom
Publisher Pergamon Press
Collection year 2016
Language eng
Abstract Adsorption isotherms of water on porous carbons generally show large hysteresis loops whose origin is believed to be different from simple gases adsorption in mesoporous solids. In this paper, we discussed in details the behavior of water adsorption isotherms and their descending scanning curves for two carbons of different topologies, a highly graphitized thermal carbon black, Carbopack F, and a highly ordered mesoporous carbon, Hex. For both solids, very large hysteresis loops are observed, but their behaviors are different. For Carbopack F, the loop extends over a very wide range of pressure and the loop is larger when the descending is started from a higher loading; while for Hex, the hysteresis loop shows distinct steps, the number of which depends on the loading where the descending starts. By carefully analyzing the scanning curves from different loadings, we established the mechanism of water adsorption in Hex as a sequence of three steps: (1) water molecules adsorb on functional groups located at the junctions between adjacent basal planes of graphene layers, (2) growth of water clusters around the functional groups, and (3) bridging of adjacent clusters to form larger clusters, followed by a complete filling of mesopores.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
 
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