کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
594760 1453992 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intermolecular interactions between a dye and cationic surfactants: Effects of alkyl chain, head group, and counterion
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Intermolecular interactions between a dye and cationic surfactants: Effects of alkyl chain, head group, and counterion
چکیده انگلیسی

The interactions between an anionic dye and cationic surfactants were investigated using surface tension measurements, spectroscopy, conductometry, and pulsed field gradient NMR (PFG-NMR). Spectroscopic and surface property characterization of the solution as a function of surfactant concentration in the presence of the dye revealed formation of three species: a dye–surfactant ion pair, small mixed aggregates of the dye and surfactant (below the critical micelle concentration (CMC) of these surfactants), and micelles composed of the cationic surfactant. Above the CMC, the dye reverted to its monomeric state or bound to the surface of the micelle. Chemometric resolution analysis confirmed the formation of three species. The hydrodynamic radii of the micelles were determined by self-diffusion coefficient measurements. The average size of the micelles was larger in the presence than in the absence of the dye. Regular solution theory was used to describe the synergistically enhanced ability to form mixed aggregates of dyes and surfactants.

Figure optionsDownload as PowerPoint slideHighlights
► The interactions between dye and surfactant molecules with opposite charges were discussed in detail.
► The results demonstrated that the interactions between surfactants and dyes may be divided into three processes: (1) Formation of hydrophobic and hydrophilic dye–surfactant ion pairs or complexes (Regions I and II). (2) Dye and surfactant aggregate formation over a size range of 0.73–0.86 nm (Region III). (3) Surfactant micelle formation (Region IV).
► These processes were observed as a function of surfactant concentration. The use of multivariate resolution methods was appropriate for studying and interpreting these processes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 380, Issues 1–3, 5 May 2011, Pages 119–127
نویسندگان
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