Effect of pH on the critical micelle concentration of sodium dodecyl sulphate

1983 ◽  
Vol 28 (4) ◽  
pp. 1331-1334 ◽  
Author(s):  
A. Rahman ◽  
C. W. Brown
Keyword(s):  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Effect Of Ph

Spectrophotometric study of the effect of sodium dodecyl sulphate on the acid-base behaviour of 4-(2-pyridylazo)-resorcinol

1991 ◽  
Vol 56 (4) ◽  
pp. 785-795 ◽  
Author(s):  
Jiří Bílý ◽  
Ludmila Čermáková ◽  
Jiří Knapp
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Azo Dye ◽  
Dissociation Constants ◽  
Sodium Dodecyl ◽  
Spectrophotometric Study ◽  
Acid Base ◽  
Strong Electrolytes ◽  
The Given

The values of the apparent dissociation constants of the azo dye 4-(2-pyridylazo)-resorcinol (PAR) have been found in the presence of sub- and supercritical concentrations of the anionogenic tenside sodium dodecyl sulphate (SDS) and the effects of the strong electrolytes NaCl and NaNO3 were also evaluated. In both electrolytes, the pKan values initially are independent of the SDS concentration and then increase. Spectrophotometric and surface tension measurements were employed to determine the critical micelle concentration (cmc) of SDS alone and in the presence of PAR and the given electrolytes. The determined cmc values were in the range 0.20–3.02 mmol l-1 and dependent on the type and concentration of the particular additive.

scholarly journals Diffusion Interactions of Some Biologically Important Transition Metal Complexes on Micellar Properties of Sodium Dodecyl Sulphate

2011 ◽  
Vol 4 (1) ◽  
pp. 135
Author(s):  
M. A. Hossain ◽  
M. A. Rahman ◽  
M. A. Subhan
Keyword(s):  
Critical Micelle Concentration ◽  
Metal Complexes ◽  
Hydrophobic Interaction ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Specific Conductance ◽  
Micellar Aggregates ◽  
Counter Ions ◽  
Rate Of Increase ◽  
Anionic Micelle

The specific conductance of aqueous solutions of sodium dodecyl sulphate (SDS) was measured from 20 to 35 ºC with an interval of 5 °C in the absence and presence of metal complexes such as [Cr(acac)2(H2O)2]Cl, K3[Fe(C2O4)3] and (NH4)4[Co(C6H5O7)2] at concentrations ranging from 2.0 × 10-4 to 8.0 x 10-4 M. The specific conductance rapidly increased at the pre-micellar region with increasing of temperature and concentration of SDS, but after critical micelle concentration (CMC) the rate of increase was slower. As the concentrations of metal complexes [Cr(acac)2(H2O)2]Cl, K3[Fe(C2O4)3] and (NH4)4[Co(C6H5O7)2] increased, the CMC of SDS decreased exponentially, which was sharp with increasing temperature. The CMC decreases due to the formation of pre-micellar aggregates of the positive counter ions of the complexes with dodecyl sulphate ions (DS-) and hydrophobic interaction between ligands of complexes and hydrophobic tail of SDS. The pre-micellar aggregate formation was essentially influenced by the counter ions binding abilities to the anionic micelle. The effect of metal complexes on lowering the CMC of SDS was found to follow the order [Cr(acac)2(H2O)2]Cl < K3[Fe(C2O4)3] < (NH4)4[Co(C6H5O7)2]. Thermodynamics of metal complexes with SDS and parameters of micellization ΔG°mic, ΔH°mic and TΔS°mic  were calculated.Keywords:  Surfactants; Sodium dodecyl sulphate; Critical micelle concentration; Pre-micellar aggregate; Hydrophobic interaction.© 2011 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i1.7989J. Sci. Res. 4 (1), 135-141 (2012) 

scholarly journals A comparative study of Critical Micelle Concentration (CMC) and Free Energy of Micellization of cationic surfactant and anionic surfactant in different composition of methanol-water mixed solvent media by conductometric method at 308.15 K

BIBECHANA ◽  
2012 ◽  
Vol 8 ◽  
pp. 37-45 ◽  
Author(s):  
Sujit Kumar Shah ◽  
Tulsi Prasad Niraula ◽  
Ajaya Bhattarai ◽  
Sujit Kumar Chattarjee
Keyword(s):  
Free Energy ◽  
Critical Micelle Concentration ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Mixed Solvent ◽  
Specific Conductivity ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Volume Fractions ◽  
Free Energy Of Micellization

Precise measurements on the specific conductivity of cationic surfactant (Dodecyltrimethyl ammonium bromide) and anionic surfactant (Sodium Dodecyl Sulphate) in methanol water mixed solvent media containing 0.1, 0.2 and 0.3 volume fractions of methanol are reported at 308.15 K. Specific conductivities of Dodecyltrimethyl ammonium bromide and Sodium Dodecyl Sulphate increase with increase in concentration and decrease with increase in the volume fractions of methanol.  Critical micelle concentration (cmc) increases with increase in volume fraction of methanol in case of both surfactants. Free energy of micellization (ΔGºm) has been calculated. Increase in cmc with increase in volume fractions of methanol has been explained in terms of breaking of structure of water due to co-solvent effect.Keywords: Critical micelle concentration; methanol-water mixed solvent media; Specific conductivity; Dodecyltrimethylammonium Bromide; Sodiumdodecyl SulphateDOI: http://dx.doi.org/10.3126/bibechana.v8i0.4883  BIBECHANA 8 (2012) 37-45

Electron transfer from excited molecules of anthracene derivatives to methylviologen. Generation of the cation-radical and hydrogen

1987 ◽  
Vol 52 (7) ◽  
pp. 1666-1671 ◽  
Author(s):  
Viktor Řehák
Keyword(s):  
Electron Transfer ◽  
Sodium Dodecyl Sulphate ◽  
Aqueous Media ◽  
Sodium Dodecyl ◽  
Cation Radical ◽  
Quantum Yields ◽  
Micellar Media ◽  
Effect Of Ph ◽  
Colloidal Platinum ◽  
Anthracene Derivatives

The quantum yields of formation of the methylviologen cation-radical were measured, the effect of pH was studied, and the possibility of photogeneration of hydrogen was examined for systems with disodium 1,5- and 1,8-anthracenedisulphonate in aqueous media or 9-acetylanthracene in micellar media of sodium dodecyl sulphate, in the presence of methylviologen, triethanolamine, and colloidal platinum.

scholarly journals Micellization behaviour of sodium dodecyl sulphate in presence and absence of sodium sulphate and zinc sulphate in distilled water by surface tension measurement

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 79-85 ◽  
Author(s):  
Kuber Limbu ◽  
Sujit Kumar Shah ◽  
Ajaya Bhattarai
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Room Temperature ◽  
Zinc Sulphate ◽  
Sodium Dodecyl ◽  
Sodium Sulphate ◽  
Distilled Water ◽  
Surface Tension Measurement ◽  
Weight Method

The accurate measurements of surface tension of sodium dodecyl sulphate (SDS) in distilled water and in presence of 0.01M Na2SO4 and 0.01M ZnSO4 at room temperature were reported by drop weight method using a stalagmometer. The critical micelle concentration (cmc) of sodium dodecyl sulphate (SDS) in distilled water was obtained higher than in presence of Na2SO4 and ZnSO4. The decrease of cmc of sodium dodecyl sulphate in the presence of salts has been discussed. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10383 BIBECHANA 11(1) (2014) 79-85

scholarly journals Critical micelle concentration of sodium dodecyl sulphate in pure water and in methanol-water mixed solvent media in presence and absence of KCl by surface tension and viscosity methods

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 103-112 ◽  
Author(s):  
Tulasi Prasad Niraula ◽  
Ajaya Bhattarai ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Sodium Dodecyl Sulphate ◽  
Mixed Solvent ◽  
Pure Water ◽  
Sodium Dodecyl ◽  
Volume Fractions ◽  
Presence And Absence

Careful measurements of surface tension and viscosity of sodium dodecyl sulphate (SDS) in presence and absence of KCl in pure water and methanol-water mixed solvent media containing 0.1, 0.2, 0.3 and 0.4 volume fractions of methanol at 308.15 K are reported. The concentration of KCl is 0.01M. The concentration of SDS varies from 4.86×10-3 to 29.56×10-3 mol.l-1. The critical micelle concentration (cmc) increases with increase in percentage of methanol and decreases with addition of salt. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10388 BIBECHANA 11(1) (2014) 103-112

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