[직/편성물 염색] Dye-Surfactant Interactions Studied Using Job's Method 출판일 : 1999.04.01 저자 : Petra Forte Tavčer, Jože Špan 서지사항 : Textile Research Journal, Volume 69, No 4(1999), 278-284 페이지 등록일 : 2012.11.16 I 조회수 : 92 작성자 : admin |
Interactions between the anionic dye Acid Orange 7 and two cationic surfactants N-
cetylpyridinium chloride (CPC1) and cetyltrimethylammonium bromide (CTMABr) in aqueous
solutions far below the CMC are studied using the method of continuous variations, also
called Job's method. Light absorbance in the visible spectral range is measured. Both
surfactants form stable associates with the acid dye. Job's method is suitable for
determining the stoichiometric composition and equilibrium association constants of the
associates studied. The molar binding ratio of both surfactant/dye associates is 1:1. The
calculated equilibrium constants are high (about 106), indicating strong interactions. From
the constants calculated at different temperatures ( 15, 25, and 35°C), the corresponding
thermodynamic functions ΔG 0, ΔH0, and ΔS0 are ob tained. We have concluded that strong
interactions between cationic surfactants and anionic dyes are the result of attractions
between oppositely charged ions combined with hydrophobic and dispersive forces.
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