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https://hdl.handle.net/11147/1998
Title: | Influence of microstructure on the rheological behavior of dense particle gels | Authors: | Wyss, Hans M. Deliormanlı, Aylin M. Tervoort, Elena V. Gauckler, Ludwig Julius |
Keywords: | Alumina Catalysis Destabilization mechanism Gelation processes Stress transmission Microstructure |
Publisher: | John Wiley and Sons Inc. | Source: | Wyss, H.M., Deliormanlı, A.M., Tervoort, E.V., and Gauckler, L.J. (2005). Influence of microstructure on the rheological behavior of dense particle gels. AIChE Journal, 21(1), 134-141. doi:10.1002/aic.10296 | Abstract: | Rheological measurements are performed on highly concentrated alumina gels. By using an in situ mechanism based on enzyme-catalyzed internal reactions, we are able to form gels of highly concentrated particles without disturbing the microstructures that develop during the gelation process. These gels are produced by two different destabilization mechanisms: Either the pH of the suspension is shifted toward the isoelectric point (ΔpH method) or the ionic strength of the suspension is increased at a constant pH (ΔI method). The two destabilization mechanisms lead to gels of significantly different microstructures. We find notable differences in the rheological behavior of the two systems, suggesting a bond-bending mechanism for stress transmission in the case of ΔpH gels and a bond-stretching mechanism in the case of ΔI gels. In addition, for both kinds of gels we compare the in situ properties to those obtained after altering the microstructure by shearing. Results suggest an increase in elastic and yield properties of concentrated particle gels with decreasing homogeneity of their microstructures. | URI: | https://doi.org/10.1002/aic.10296 http://hdl.handle.net/11147/1998 |
ISSN: | 0001-1541 0001-1541 1547-5905 |
Appears in Collections: | Chemical Engineering / Kimya Mühendisliği Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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