Abstract
The behavior of carbon black which was coated with palmitic acid in a detergent solution was discussed in terms of the ζ-potential and the potential energy of interaction. The detergent was composed of sodium dodecyl sulfate (SDS);20%;zeolite, 20%;sodium silicate, 5%;sodium carbonate, 3%;sodium carboxymethyl cellulose, 1%;and sodium sulfate, 51%. Theζ-potential of the coated carbon black (coated-CB) in each aqueous solution of SDS, various builders, and the detergent were measured by a microelectrophoresis. The potential energies of interactions between coated-CB and fabrics (nylon and cellulose), between coated-CB and zeolite, between coated-CB and clay, and between coated-CB and carbon black were calculated by the use of the theory of heterocoagulation and that between coated-CB particles by the use of the DLVO theory. It is suggested from the total potential energy curves thus obtained that the coated-CB particles deposit onto cotton fabrics easily in SDS solution, but this deposition can be prevented by the addition of builders to the solution.
