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The dispersibility of hydrophobic carbon black particles in polar organic media and the effect of surfactants on the dispersibility were studied. The dispersibility was investigated for two kinds of carbon black particles (SR, SB-4) possessing different surface polarity in the absence or the presence of an anionic surfactant (AOT) and nonionic surfactant (NP-10) in 2-butanone. The dispersibility was quite different for the two different carbon black particles in the absence of the surfactants Good dispersibility for the system of SB-4 with a strong surface polarity and bad for SR with a weak surface polarity. This behavior is considered to be due to the difference in the nature of the solvation layer on the particle surface which is caused by the difference in surface polarity. The dispersibility of carbon black was quite different under the existence of the two kinds of surfactants. Although the C-potential decreased slightly by the addition of NP-10, it was not adsorbed on carbon black particles and no change in dispersibility was observed. On the other hand, the flocculation of carbon black was accelelated by addition of a small amount of AOT for both kinds of the particles, and even more so for SB-4 which showed a good dispersibility in the absence of AOT. This characteristic flocculation of carbon black in polar organic media in the presence of AOT was considered to be due to the following reasons. The desolvation proceeds on the particle surface due to the adsorption of a part of counter ions (Na+) formed by dissociation of AOT in the bulk solution, and which, in turn, causes a sudden decrease in c-potential.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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