Effects of surfactants on the molecular aggregation of rhodamine dyes in aqueous solutions

Tajalli, H.; Gilani, A. Ghanadzadeh; Zakerhamidi, M.S.; Moghadam, M.

doi:10.1016/j.saa.2008.09.033

Cited by 83 publications

(40 citation statements)

References 22 publications

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“…On the other side, above CMC, the surfactant promotes the dissociation of aggregates (postmicellar condition), increasing the electrostatic repulsion of dye molecules [20], forcing that molecular structures in the solution tends to be a distribution of homomicelles with monomeric form of dyes dispersed in the hydrophobic core of surfactant micelles. The shielding provided by micelles is confirmed from the measurement of the fluorescence signal (established as a 2.5-fold increase [2]), a direct consequence of additional rigidity of molecular structure, minimizing the rotational movement and thermal fluctuations of monomers dispersed in water [6].…”

Section: Introductionmentioning

confidence: 99%

Dye aggregation and influence of pre-micelles on heterogeneous catalysis: A photophysical approach

Macedo

Boni

Misoguti

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Introductionmentioning

confidence: 99%

Dye aggregation and influence of pre-micelles on heterogeneous catalysis: A photophysical approach

Macedo

Boni

Misoguti

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Nature of the solvent (polar, nonpolar) have direct influence on the dimerization of the R6G dye. Apart from solvent effect, nature of surfactant (ionic and neutral) in dye-surfactant system exhibit direct influence on the ratio of their doublet intensity [37]. There are reports explaining the On the other hand, addition of CTAB in the aqueous solution of R6G does not show any substantial change in the intensity ratios of the doublet band which indicates that there is no prominent intermolecular interaction between R6G and CTAB.…”

Section: One Photon Absorption and Fluorescence Studymentioning

confidence: 96%

“…Interactions with other surfactants (anionic and neutral) pose strong intermolecular interaction with R6G dye. The interaction of R6G dye molecule with cationic surfactant CTAB in water shows enhancement in R6G absorbance [32] and almost no change in fluorescence behavior [37]. Extent of spectral shift in absorbance of R6G in water is larger for anionic surfactant as compared to that of cationic surfactant.…”

Section: Introductionmentioning

confidence: 96%

Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide

2016

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We investigate the effect of cetyl-trimethyl-ammonium-bromides (CTAB) concentration on the fluorescence of Rhodamine-6G in water. This spectroscopic study of Rhodamine-6G in presence of CTAB was performed using two-photon-induced-fluorescence at 780 nm wavelength using high repetition rate femtosecond laser pulses. We report an increment of ∼10 % in the fluorescence in accordance with ∼12 % enhancement in the absorption intensity of the dye molecule around the critical micellar concentration. We discuss the possible mechanism for the enhancement in the two-photon fluorescence intensity and the importance of critical micellar concentration.

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“…Metode spektrofotometri juga banyak digunakan untuk analisis surfaktan anionik. Analisis secara spektrofotometri dapat dilakukan dengan menggunakan pereaksi methylene blue (Ogeleka et al, 2010), ethyl violet (Yamamoto and Motomizu, 1987), rhodamine B dan rhodamine 6G (Tajalli et al, 2009), dan acridine orange ( Adak et al, 2005). Terdapat beberapa kekurangan dalam analisis surfaktan anionik dengan metode dan pereaksi tersebut, yaitu bahan yang kurang ramah lingkungan dan biaya operasionalnya mahal.…”

Section: Pendahuluanunclassified

Analitical Method Validation of Anionic Surfactant Sodium Dodecyl Benzene Sulfonate (Sdbs) in Catfish by Uv-Vis Spectrophotometry Using Acridine Orange

2017

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ABSTRAKPengembangan metode analisis surfaktan anionik natrium dodesil benzena sulfonat (SDBS) secara spektrofotometri UV-Vis menggunakan acridine orange (AO) dalam ikan lele telah dilakukan. Penelitian ini bertujuan untuk menentukan kondisi optimum analisis dan parameter validasi metode analisis SDBS dalam tubuh ikan lele. Penelitian ini dibagi dua tahap, yaitu isolasi SDBS dalam tubuh ikan lele dengan ekstraksi Soxhlet dan analisis SDBS. Analisis SDBS didasarkan pada pembentukan pasangan ion antara dodesil benzena sulfonat (DBS) dan AO. Hasil penelitian menunjukkan bahwa analisis dilakukan pada panjang gelombang maksimum pasangan ion DBS dan AO 499 nm dengan menggunakan etanol sebagai pelarut AO dan perbandingan mol DBS:AO sebesar 2:1, serta pH optimum 2,97. Validasi metode menunjukkan nilai linearitas (r) 0,998, batas deteksi 0,0343 mg/L, batas kuantifikasi 0,104 mg/L, presisi 0,382 -1,78 %, sensitivitas 4,64 x 10 4 L mol -1 cm -1 dan akurasi 82,11 -100,3 %.Kata kunci: acridine orange, lele, surfaktan, validasi. ABSTRACTThe analytical method development on an anionic surfactant of sodium dodecylbenzenesulfonate (SDBS) in a catfish using spectrophotometer UV-Vis using acridine orange (AO) has been conducted. This research aims to determine the optimum conditions of analysis and to determine validation parameters of sodium dodecylbenzenesulfonate (SDBS) analysis in a catfish. This study was divided into two steps, isolation of sodium dodecyl benzene sulfonate (SDBS) in the catfish with soxhlet extraction and the analysis of SDBS. The analysis of sodium dodecylbenzenesulfonate (SDBS) is based on the formation of ion pair between dodecylbenzenesulfonate (DBS) and acridine orange (AO). The results showed that the analysis can be performed at 499 nm, using ethanol as acridine orange (AO) solvent, the mole ratio of dodecylbenzenesulfonate (DBS) acridine orange (AO) 2:1, and pH 2.97. The parameters of

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Effects of surfactants on the molecular aggregation of rhodamine dyes in aqueous solutions

Cited by 83 publications

References 22 publications

Dye aggregation and influence of pre-micelles on heterogeneous catalysis: A photophysical approach

Dye aggregation and influence of pre-micelles on heterogeneous catalysis: A photophysical approach

Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide

Analitical Method Validation of Anionic Surfactant Sodium Dodecyl Benzene Sulfonate (Sdbs) in Catfish by Uv-Vis Spectrophotometry Using Acridine Orange

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