Please use this identifier to cite or link to this item:
https://doi.org/10.1016/j.powtec.2007.11.047
DC Field | Value | |
---|---|---|
dc.title | Yield stress-zeta potential relationship of oxide dispersions with adsorbed polyacrylate - Steric effect and zeta potential at the flocculated-dispersed transition state | |
dc.contributor.author | Ong, B.C. | |
dc.contributor.author | Leong, Y.K. | |
dc.contributor.author | Chen, S.B. | |
dc.date.accessioned | 2014-10-09T07:06:00Z | |
dc.date.available | 2014-10-09T07:06:00Z | |
dc.date.issued | 2008-08-11 | |
dc.identifier.citation | Ong, B.C., Leong, Y.K., Chen, S.B. (2008-08-11). Yield stress-zeta potential relationship of oxide dispersions with adsorbed polyacrylate - Steric effect and zeta potential at the flocculated-dispersed transition state. Powder Technology 186 (2) : 176-183. ScholarBank@NUS Repository. https://doi.org/10.1016/j.powtec.2007.11.047 | |
dc.identifier.issn | 00325910 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/90502 | |
dc.description.abstract | The yield stress-DLVO force relationship is obeyed by α-Al2O3 and alumina-coated TiO2 dispersions with adsorbed polyacrylate only if the yield stress and its corresponding zeta potential data were collected in the positively charged region. In this region, the underlying surface positive charge density of the particles exceeds the negative charge density of the polyacrylate. At this state the adsorbed polyelectrolyte lies flat on the particle surface forming a steric layer of fixed thickness at a given polymer concentration. In the negative charge region, the steric layer thickness is not constant and hence yield stress-DLVO relationship is not obeyed. The (critical) zeta potential at the flocculated-dispersed transition state decreases with increasing polymer concentration. This result reflects a decreasing van der Waals force as the steric layer increases in thickness. A steric layer ensured that the surface or zeta potential is sufficiently low in the flocculated regime for the DLVO theory to remain valid. The ratio of the critical zeta potential square between alumina-coated TiO2 and α-Al2O3 is an indication of their Hamaker constants ratio in water. The effect of alumina coating on the value of this ratio is presented and discussed. © 2007 Elsevier B.V. All rights reserved. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.powtec.2007.11.047 | |
dc.source | Scopus | |
dc.subject | Alumina | |
dc.subject | Coated titania | |
dc.subject | Critical zeta potential | |
dc.subject | Flocculated-dispersed transition state | |
dc.subject | Polyacrylate | |
dc.subject | Yield stress-DLVO relationship | |
dc.type | Article | |
dc.contributor.department | CHEMICAL & BIOMOLECULAR ENGINEERING | |
dc.description.doi | 10.1016/j.powtec.2007.11.047 | |
dc.description.sourcetitle | Powder Technology | |
dc.description.volume | 186 | |
dc.description.issue | 2 | |
dc.description.page | 176-183 | |
dc.description.coden | POTEB | |
dc.identifier.isiut | 000258364400008 | |
Appears in Collections: | Staff Publications |
Show simple item record
Files in This Item:
There are no files associated with this item.
SCOPUSTM
Citations
21
checked on Jan 15, 2021
WEB OF SCIENCETM
Citations
18
checked on Jan 7, 2021
Page view(s)
70
checked on Jan 10, 2021
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.