| Autor: |
Kremer, F., Lagaly, G., Solans, C., Infante, M. R., García-Celma, M. J., Peikov, V., Radeva, Ts., Stoylov, S. P., Hoffmann, H. |
| Zdroj: |
Trends in Colloid & Interface Science X; 1996, p64-67, 4p |
| Abstrakt: |
Aqueous suspensions of Polytetrafluorethylene (PTFE) rod-like particles have been studied by electric light scattering at different particle concentrations (0.05-4% w/w) and degrees of dialysis. For particle concentrations 1 and 4% w/w the electric light scattering effect changes its sign from positive to negative when going to lower frequencies at low electric field strengths for both undialyzed and dialyzed samples, which could be due to the interparticle interactions. Dialysis decreases the amount of the bound ionic surfactant and consequently, the surface charge of the particles. As a result, the interparticle electrostatic interactions are much stronger in the undialyzed samples in comparison to the dialyzed ones. The higher surface charge could also explain the observed increase of the relaxation frequency of the surface electric polarizability in the undialyzed suspensions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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