Carbon black selective neutralization

Selective neutralization experiments provide another method for evaluating the relationship between the absorption spectra and the identity of the surface species [6,16]- Samples of Monarch 1300 carbon black which had been back titrated with different strength bases as per the Boehm scheme (see Table I) were filtered, washed with neutral water and then reacidified with dilute HC1. Spectra were obtained on samples dried after each of these steps. In these samples, the reacidification process completely reversed the changes in the spectra which had been produced by the selective neutralizations. Figure 10 compares the result of the NaHC03 titration with that of the reacidified black. This weak base, which is used to measure the carboxylic acid content of the black, reduces the 1725 cm 1 band and increases the intensity of the 1595 cm 1 band. Futhermore, there... 

---