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The interactions of citrate-capped 10-nm gold nanoparticles with a cationic model surfactant, CTACl, and an anionic one, SDS, are explored. Results show that for CTACl, values of the c.m.c. close to those reported in the absence of nanoparticles can be obtained by simple colorimetric measurements. For SDS, its interaction with the same-charge nanoparticles is explored through the use of an indirect...