کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
597486 | 1454067 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Aggregation of carboxylate gemini surfactant with p-Oxybenzene spacer in aqueous solution studied by intrinsic probe spectroscopy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
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چکیده انگلیسی
The micellization of C11pPHCNa, a carboxylated gemini surfactant with an p-Oxybenzene residue in the spacer, in aqueous solution at pH 12 was characterized by the absorption and the fluorescence spectra of the p-Oxybenzene residue. The critical micelle concentration of C11pPHCNa was determined by the absorption spectra to be 0.0940 mmol Lâ1, which agreed well with that measured by surface tension technique. The fluorescent intensity of C11pPHCNa aqueous solution rapidly increased with increasing C11pPHCNa concentration (C) then reduced when C was beyond 0.45 mmol Lâ1, which meant the self-quenching occurring. At fixed C, the time-resolved and the steady-state fluorescence quenching with the p-Oxybenzene residue as the intrinsic probe and with methyl viologen (MV2+) as the extrinsic quencher could be used to measure the aggregation number (N) of C11pPHCNa micelle. The results showed the N for the micelle formed at C = 1.5 mmol Lâ1 was 14.5 and gradually increased with further increasing C. This indicated the more and more molecules packed within a micelle with increasing C, which explained well the fluorescence self-quenching when C was beyond 0.45 mmol Lâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 304, Issues 1â3, 1 September 2007, Pages 25-30
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 304, Issues 1â3, 1 September 2007, Pages 25-30
نویسندگان
Jinyan Liu, Jianxi Zhao, Yunjing He,