Effect of binary solvents on the critical micelles concentration by using 1-methyl-4-[4′-aminostyryl]pyridinium iodide

Al-Sherbini, El-Sayed A.M.; Abdel‐Kader, Mahmoud H.; Hamzah, Riyad Y.

doi:10.1016/s0927-7757(01)00784-1

Cited by 10 publications

(9 citation statements)

References 25 publications

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“…Sjöberg et al [6,7] observed higher critical micelle concentration (CMC) and smaller aggregation number for cationic surfactants with increasing fractions of EG in water. Al-Sherbini et al [8] attributed the increase in CMC of sodium dodecyl sulfate (anionic surfactant) with the addition of EG to the lower polarity, the lower dielectric constant and the larger hydrophobic surface of the co-solvent molecules. However, the effect of dielectric constant is debatable.…”

Section: Introductionmentioning

confidence: 99%

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Zhang

Schmidt

Talmon

et al. 2005

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Zhang

Schmidt

Talmon

et al. 2005

Journal of Colloid and Interface Science

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“…The micellar deformation rearranged around the small hydrophobic surface (glycerol) decreasing the overall dielectric constant. Sherbini et al [21] studied the effect of the dielectric constant and the effect of hydrophobic surface on the c.m.c in binary glycerol/water ratios. The results obtained illustrated that the smaller in hydrophobic surface, and the larger in dielectric constant, the weakest the effect on the denaturation of c.m.c.…”

Section: Resultsmentioning

confidence: 99%

Thermal Reshaping of Gold Nanorods in Micellar Solution of Water/Glycerol Mixtures

Al-Sherbini

2010

Journal of Nanomaterials

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Gold nanorods (Nds) with aspect ratios of 4, 3.5, and 2.8 were prepared by the electrochemical method. The nanorods were thermally studied in binary solvents of aqueous glycerol at different ratios (25%–75%). The results illustrated that the longitudinal surface plasmon resonance (SPL) is strongly dependent on the dielectric constant. The maximum absorption is red shifted with increasing the glycerol/water ratio. This was attributed to the decreasing value of the dielectric constant of the binary solvents. Moreover, by increasing the temperatures, the results showed relative instability of the gold nanorods. This attributed to the relative instability of the micelle capping the nanorods.

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“…In the presence of DMSO, acetonitrile and methanol, the enrichment factors of all analytes decreased. This can be explained by polarity and dielectric constant of the organic solvents [28,29]. As it can be observed, the lowest and highest enrichment factors (among the solvents with dielectric constant lower than water) were obtained when methanol and DMSO were used as organic dispersive solvents, respectively.…”

Section: Effect Of Type and Volume Of Disperser Solventmentioning

confidence: 94%

“…Characteristics of dispersive solvents such as polarity and dielectric constant can affect the stability of micelles and change the CMC of the surfactants. The lower the polarity and the dielectric constant of the dispersive solvent, the greater the increase in the CMC [28]. Therefore, the selection of disperser solvent is a critical factor in CP-DLLME.…”

Section: Effect Of Type and Volume Of Disperser Solventmentioning

confidence: 99%

Cloud Point‐Dispersive Liquid‐Liquid Microextraction for Extraction of Organic Acids from Biological Samples

Daneshfar

Khezeli

2014

J Surfact & Detergents

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A new method combining cloud point extraction (CPE) with dispersive liquid–liquid microextraction (DLLME) named “cloud point‐dispersive liquid–liquid microextraction (CP‐DLLME)” was presented in this work for the first time for the determination of organic acids as model compounds in biological samples using high performance liquid chromatography and UV detection (HPLC–UV). Water (disperser solvent) containing tert‐octylphenol ethoxylate (7.5EO) as extraction solvent, was rapidly injected into a warmed sample solution and cloudy state formed immediately. After that, phase separation was performed by centrifugation. The surfactant‐rich phase was diluted with acetonitrile and injected into a HPLC–UV apparatus. The influence of several important parameters on the extraction efficiencies was evaluated. Under optimized experimental conditions, the calibration graphs were linear in the range of 0.06–1,500 µg L−1 for target analytes. Coefficient of determination (r2) ranged from 0.9985 to 0.9994. The limits of detection were in the range of 0.05–17.1 µg L−1. The new method was successfully applied with satisfactory results for analysis of target analytes in spiked samples. The relative mean recoveries of the spiked samples ranged from 91.8 to 107.1 % with relative standard deviations in the range of 2.1 to 4.3 %.

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Effect of binary solvents on the critical micelles concentration by using 1-methyl-4-[4′-aminostyryl]pyridinium iodide

Cited by 10 publications

References 25 publications

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Co-solvent effects on drag reduction, rheological properties and micelle microstructures of cationic surfactants

Thermal Reshaping of Gold Nanorods in Micellar Solution of Water/Glycerol Mixtures

Cloud Point‐Dispersive Liquid‐Liquid Microextraction for Extraction of Organic Acids from Biological Samples

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