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The adsorption isotherms of nonionic surfactants Triton X-100 and Triton X-305 fromwater and cyclohexane on carbon black have been determined at 15 and 30℃. The Langmuir-typeand BET-type isotherms are obtained for adsorption of Triton X-100 and Triton X-305 from waterand cyclohexane respectively. Both the contact angles of water for graphite/water/air and graphite/water/cyclohexane decrease monotonously with increasing surfactant concentration. From theseresults, it is proposed that the adsorption of Triton X-100 and Triton X-305 on carbon black or gra-phite from water is monolayer. For the adsorption from cyclohexane solutions, the ethyleneoxidegroup of the surfactant molecules may be adsorbed onto the polar spot at the surface of carbon black,and the hydrophobic group of adsorbed molecules may direct toward the liquid phase or attaches tothe nonpolar surface region around the polar spot. As the concentration increases, the ethyleneoxide groups of the adsorbed molecules can be aggregated with each other via polar interactions toform hemi-reversed micelle.
The adsorption isotherms of nonionic surfactants Triton X-100 and Triton X-305 from water and cyclohexane on carbon black have been determined at 15 and 30 ° C. The Langmuir-type and BET-type isotherms are obtained for adsorption of Triton X-100 and Triton X Both these contact angles of water for graphite / water / air and graphite / water / cyclohexane decrease monotonously with increasing surfactant concentration. From these results, it is proposed that the adsorption of Triton X- 100 and Triton X- 305 on carbon black or gra-phite from water is monolayer. For the adsorption from cyclohexane solutions, the ethyleneoxidegroup of the surfactant molecules may be adsorbed onto the polar spot at the surface of carbon black, and the hydrophobic group of adsorbed molecules may direct toward the liquid phase or attaches tothe nonpolar surface region around the polar spot. As the concentration increases, the ethyleneoxide groups of the adsorbed molecules can be aggre gated with each other via polar interactions toform hemi-micelles.