The average aggregate number（N）of electrostatically stabilizedaggregate（ESAg）composed of oppositely-charged long-chain molecules,i.e.,sodium ω-[α-（nathphyl）ethoxyl]undecanoate（FP-）and cetyltrimethyl ammoniumchloride（CTAC）,in aqueous solution at 25℃ has been measured to be 11 to 16in the CTAC-concentration range of 11×10-5 M to 30×10-5 M at a fixed FP-concentration of 1.0×10-5M by the photon counting method.
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