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Water-insoluble dodecylphosphate (DP) was solubilized by a micelle of a nonionic surfactant such as Triton X-100(TX) and Triton N (TN) , f orming a mixed micelle. The mixed micelle was adsorbed by HAP after isomorphous substitution of phosphate group of DP for orthophosphate ion on HAP and electrostatic attractive force between a negative charge of DP and Ca2+ on HAP. As a result, nonadsorbable nonionic surfactant was adsorbed indirectly to HAP together with DP forming hemiand/or admicelle . In an aqueous solution of CaCl2, the solution of nonionic surfactant-DP became turbid. DP was selectively captured by Ca2+, resulting in formation of the Ca-DP precipitate, which was separated from the mixed micelle . However, nonionic surfactant remained in an aqueous phase . Thus, the mixed micelle showed different behavior on the surface of HAP and in an aqueous phase . INTRODUCTION It was shown in the previous papers that hydroxyapatite (Ca 10(PO4)6(OH)2, H AP) easily adsorbs sodium dodecylsulfate (SDS)1 and sodium dodecylbenzenesulfo nate (SDBS)2 by virtue of electrostatic attractive force between cationic sites on the surface and anionic head groups of these compounds and byvirtue of ion exchange of the head group(i.e ., sulfate and sulfonate group) with orthophosphate ion on the surface. Nonionic surfactant, which has polyoxyethylene chain as a hydrophilic group , i s non-adsorbable to HAP when it was added into an aqueous solution in asingle sh ot. However, it was adsorbed in the presence of SDS or SDBS , because nonionic surfactant and these compounds formed a mixed micelle which is adsorbable to HAP. Similar result was obtained from the mixed micelle of nonionic surfactant and water-insoluble dicetylphosphate(DCP) .3 In the present paper, the binding mechanism of nonionic surfactant , Triton

BINDING MECHANISM OF TRITON X-100 AND TRITON N TO THE SURFACE OF HYDROXYAPATITE IN AN AQUEOUS PHASE