JOURNAL OF COSMETIC SCIENCE 624 type of polymer coating was shown to have more infl uence than its concentration, and the weight difference by mascara application increased, as cationic treatment resulted in a lower particle cluster size and surface charge modifi cation of the pigments. The biggest difference in weight on artifi cial eyelashes was obtained from treatment with 10% PQ-6, whereas 10% GHC coating showed the best texture and volume effects from the panel sensory test. From the fi ndings of this study, we can conclude that treating the surface of iron oxides with cationic polymers is an attractive approach in increasing the volume effect of eyelashes by mascara application. ACKNOWLEDGMENTS The authors express their thanks to Ms. J. S. Kim at Otsuka Electronics Korea for her support. REFERENCES (1) J. Hollenburg, Surface treatment of cosmetic pigments, Cosmet. Toiletr., 117, 51 (2002). (2) D. H. Song, Y. J. Choi, K. J. Kim, S. Y. Ko, S. H. Lee, J. U. Hong, H. H. Kang, I. S. Chang, and O. S. Lee, Silanyl glutamate as a surface treatment for pigments, Cosmet. Toiletr., 115, 53 (2000). (3) C. R. Robbins, Chemical and Physical Behavior of Human Hair, 4th ed. (Springer-Verlag, New York, 2002), pp. 345–385. (4) E. D. Goddard, J. A. Faucher, R. J. Scott, and M. E. Turney, Adsorption of polymer JR on keratinous surfaces—Part II, J. Soc. Cosmet. Chem., 26, 539 (1975). (5) R. B. Hannan, E. D. Goddard, and J. A. Faucher, Desorption of a cationic polymer from human hair: Surfactant and salt effects, Textile Res. J., 48, 57 (1978). (6) J. A. Faucher and E. D. Goddard, Infl uence of surfactants on the sorption of a cationic polymer by kera- tinous substrates, J. Colloid. Interface Sci., 55, 313 (1976). (7) T. Mitsui, New Cosmetics Science (Elsevier Science, The Netherlands, 1997), pp. 47–69. Figure 6. Correlation between weight difference by mascara application on eyelashes and sensory test score (n = 10).
CATIONIC TREATMENT OF IRON OXIDES 625 (8) J. Jachowicz, M. Berthiaume, and M. Garcia, The effect of the amphiprotic nature of human hair keratin on the adsorption of high charge density cationic polyelectrolytes, Coll. Polym. Sci., 263, 847 (1985). (9) J. I. Na, O. S. Kwon, B. J. Kim, W. S. Park, J. K. Oh, K. H. Kim, K. H. Cho, and H. C. Eun, Ethnic characteristics of eyelashes: A comparative analysis in Asian and Caucasian females, Br. J. Dermatol., 155, 1170 (2006). (10) V. M. Longo, V. F. Monteiro, A. S. Pinheiro, D. Terci, J. S. Vasconcelos, C. A. Paskocimas, E. R. Leite, E. Longo, and J. A. Varela, Charge density alterations in human hair fi bers: An investigation using electrostatic force microscopy, Int. J. Cosmet. Sci., 28, 95 (2006).
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