Surface Force Arising from Adsorbed Graphene Oxide in Alumina Suspensions with Different Shape and Size

Title
Surface Force Arising from Adsorbed Graphene Oxide in Alumina Suspensions with Different Shape and Size
Authors
최형진
Keywords
graphene oxide, alumina morphology, yield stress, zeta potential, particle bridging
Issue Date
2013
Publisher
AICHE JOURNAL
Series/Report no.
AICHE JOURNAL; vol.59 startpage 3633 endpage 3641
Abstract
The effects of graphene oxide (GO) on the yield stress-pH of a-Al2O3 (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
URI
http://dspace.inha.ac.kr/handle/10505/31683
ISSN
0001-1541
Appears in Collections:
College of Engineering(공과대학) > Mechanical Engineering(기계공학) > Local Access Journal Papers, Reports(기계공학 논문, 보고서)

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