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Surface force arising from adsorbed graphene oxide in alumina suspensions with different shape and size
Author(s) -
Husin Hazlina,
Leong YeeKwong,
Liu Jishan,
Choi Hyoung Jin,
Zhang Wen Ling
Publication year - 2013
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14133
Subject(s) - adsorption , zeta potential , graphene , oxide , chemical engineering , materials science , particle (ecology) , particle size , nanotechnology , composite material , chemistry , nanoparticle , organic chemistry , metallurgy , oceanography , geology , engineering
The effects of graphene oxide (GO) on the yield stress‐pH of α‐Al 2 O 3 (alumina) suspensions were investigated. For micron‐sized platelet alumina suspensions, micron‐sized GO additive increased the maximum yield stress by as much as six‐folds. This was attributed to GO‐mediated bridging interactions between the platelet particles. This type of bridging interactions was much less effective with submicron‐sized, spherical, and irregular shape alumina. Adsorption of the anionic GO reflected by the shift of pH of zero zeta potential to a lower pH is particularly high for platelet alumina. The 1.0 dwb % GO concentration added is sufficient to reinforce each platelet particle–particle bond, assisted by a directed GO–platelet interaction configuration. This is, however, not true with submicron‐sized particles as the particle concentration increases sharply with the inverse of the particle diameter to power of 3. Moreover, a GO sheet can adsorb several submicron‐sized particles and this does not produce the right interaction configuration. © 2013 American Institute of Chemical Engineers AIChE J , 59: 3633–3641, 2013