Surface charge density determination in electric double layered magnetic fluids

We analyze potentiometric and conductimetric measurements, simultaneously performed in several complex systems (Brönsted acid-base-type). The results show an excellent agreement between reported and obtained values of the dissociation constants of the involved equilibria. A similar analysis is propo...

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Bibliographic Details
Published in:Brazilian journal of physics 2002-06, Vol.32 (2b), p.501-508
Main Authors: Tourinho, F.A., Campos, A.F.C., Aquino, R., Lara, M.C.F.L., Silva, G. J. da, Depeyrot, J.
Format: Article
Language:English
Subjects:
PHYSICS, MULTIDISCIPLINARY
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Summary:We analyze potentiometric and conductimetric measurements, simultaneously performed in several complex systems (Brönsted acid-base-type). The results show an excellent agreement between reported and obtained values of the dissociation constants of the involved equilibria. A similar analysis is proposed to account, in electric double layered magnetic fluids (EDL-MF), for the charging of the particle surface based on a proton transfer proccess at the interface with the bulk dispersion. This model allows to relate the pH dependence of the phase diagram to the variations of the nanoparticle surface charge density, which leads to a useful method to monitor the colloidal stability of EDL-MF.
ISSN:0103-9733
1678-4448
DOI:10.1590/S0103-97332002000300008