Aggregation and adsorption properties of sodium dodecyl sulfate in water–acetamide mixtures

Das, Debesh K.; Ismail, K.

doi:10.1016/j.jcis.2008.07.045

Cited by 79 publications

(69 citation statements)

References 43 publications

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“…The cmc is a distinguishing property of the surfactants, which can vary with various physicochemical conditions. It is well known that the physicochemical and microstructural properties of a particular surfactant can be tuned to desired size, shape and application by varying the structure of surfactant monomers [2,3], and the solution conditions such as concentration, solvent polarity and type, temperature, pressure as well as by the presence of various additives [4][5][6][7][8].…”

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confidence: 99%

Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

2015

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Values of the critical micelle concentration (cmc) and degree of counterion dissociation (a) of four cationic surfactants: cetyltrimethylammonium bromide (CTAB), cetylpyridinium bromide (CPB), cetylpyridinium chloride (CPC) and benzyldimethylhexadecylammonium chloride (BDHAC) in aqueous-glycine medium (concentration of glycine (Gly) varied from 0 to 0.20 molÁdm -3 ) were determined through conductometric measurements at 303 K. The effect of temperature on the micellization in the presence of 0.10 molÁdm -3 Gly were studied for the surfactants CTAB, CPC and BDHAC. With respect to the concentration of Gly, a decrease in the cmc was observed for CTAB, CPC and CPB whereas an increase was observed for BDHAC. A regular increase in a was obtained for CPB, CPC and BDHAC with respect to the concentration of Gly whereas values were roughly constant in the case of CTAB. Thermodynamic parameters were computed from the temperature dependence of the cmc values and it was found that the micellization process is exothermic. Compensation of enthalpy and entropy was observed for the micellization of CTAB, CPC and BDHAC in the presence of 0.10 molÁdm -3 Gly.

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Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

2015

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“…The vibronic structure of the fluorescence spectrum of the monomeric pyrene is known to be sensitive to the local polarity. In particular, the I 1 /I 3 ratio of the intensities of the first and third vibronic peaks increases on going from aliphatic to polar solvents (Aguiar et al 2003;Kim et al 2000;Ismail 2008) and can be used as an index of the effective local polarity of the pyrene solubilization site in the hydrophobic domain. The ratio I 1 / I 3 is the ratio of the intensity of peak I 1 (374.0 nm) to that of peak I 3 (385.0 nm) of the vibration fine structure of pyrene monomer emission.…”

Section: Fluorescence Spectrum and Dlsmentioning

confidence: 99%

Factors influencing the aggregation behavior of residual associative polymer in produced oily fluids

Chen

Zhu

et al. 2016

Pet. Sci.

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The influence of emulsified oil, suspended solids, Fe 3? , Fe 2? , cationic water clarifier and sulfate-reducing (SR) bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oily wastewater from polymer flooding was studied by fluorescence spectroscopy and dynamic light scattering. The result of I 1 /I 3 showed that the polarity of hydrophobic microdomains increased, whereas the size of the hydrophobic microdomains may be decreased, where the value of I 1 /I 3 represents the ratio of the intensity of peak I 1 (374.0 nm) to that of peak I 3 (385.0 nm) of the vibration fine structure of pyrene monomer emission in residual polymer solution. The results of the ratio of I 1 at 48 h to I 1 at 0 h (I 1,48h /I 1,0h ) indicated that oil and cationic water clarifier could inhibit the aggregation to some extent, while Fe 2? and suspended solids were helpful for aggregation, and Fe 3? and SR bacteria had no significant influence on the aggregation of polymer.

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“…It equals to n c −1 [32], and n c is the number of carbon atoms in the hydrocarbon chain of [C n mim]Br. The radius (r) of the micelle, the surface area per head group (a 0 ), and the packing parameter (P) were calculated from the expressions r=[3vN agg /(4π)] 1/3 , a 0 =3v/r, and P=v/(a 0 l), respectively [43]. The values of r, a 0 , and P are also given in Table 5.…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures

et al. 2015

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Densities, conductivities, and fluorescence spectra of two imidazolium ionic liquids ([C n mim]Br, n=10, 14)-glycyl dipeptide-water mixtures were measured as a function of temperature. The density data have been utilized to calculate the apparent molar volumes, standard partial molar volumes (V 2,φ 0 ), standard partial molar volumes of transfer from water to aqueous ionic liquids solutions (Δ t V°), the hydration number (N H ), partial molar expansibility (E φ 0 ), and Hepler's constant of glycyl dipeptides. Through the electrical conductivity measurements, the c cmc values at different temperatures and a series of thermodynamic parameters (ΔG m o , ΔH m o , and ΔS m o ) of micellization of [C n mim]Br (n=10, 14) in aqueous glycyl dipeptides solutions are evaluated. The pyrene fluorescence spectra were used to study the change of micropolarity produced by the interaction of [C n mim]Br with glycyl dipeptide, and the aggregation behavior of [C n mim]Br (n=10, 14). The results shown above have been explained in terms of solutesolvent interactions and structural changes in the mixed solutions. The interaction between [C n mim]Br (n=10, 14) and glycyl dipeptide is affected by temperature and hydrocarbon chain length of the dipeptides.

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Aggregation and adsorption properties of sodium dodecyl sulfate in water–acetamide mixtures

Cited by 79 publications

References 43 publications

Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

Factors influencing the aggregation behavior of residual associative polymer in produced oily fluids

Apparent molar volume, conductivity, and fluorescence studies of ternary systems of dipeptides + ionic liquids ([Cnmim]Br, n = 10, 14) + water at different temperatures

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