Zeta potential carbon black dispersions

Zeta-Potentials of Carbon Black Dispersions in Hydrocarbons with OLOA-1200 Dispersant (14-16)... 

Figure 9. Zeta-potential of carbon black dispersed in dodecane with OLOA-1200 dispersant (23°C.). Sampled from dispersions of 3.33 g of carbon black per liter of dodecane. Reproduced with permission from Ref. (14). Copyright 1983, Elsevier Science Publishers.

Initial studies were made with the Rank Bros, electrophoresis unit, using the dilute supernatant suspension over a dispersion of 3.33g of carbon black per liter of dodecane equilibrated for 24 hours with the added 0L0A-1200. The electrophoretic mobility (u) of 1-3 pm clumps of particles was observed at a field of 100 volts per centimeter. The zeta-potentials ( ) were calculated... 

The surface of FW200 carbon black exhibited an electron acceptor (acidic) characteristics. On the other hand, the N550 showed electron donor (basic) character which was reflected by the zeta potential analysis. The addition of dispersing agents changed the character of filler s surface as shown in Figure 3. 

Zeta potential analysis of fillers dispersed in water. The surface of N550 and Printex carbon black exhibited an electron donor (basic) characteristics. The isoelectric point for semi-active black and conductive occurred at respectively pH=9,5, pH=10,5. On the other hand the FW200 carbon black showed electron acceptor (acidic) characteristics in whole pH measuring range. 

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