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

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

scholarly journals Physicochemical Studies on the Interaction between Sodium Dodecyl Sulfate and Methylene Blue in Methanol-Water Mixed Solvent Media

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Pawan Shah ◽  
Nilam Jha ◽  
Ajaya Bhattarai
Keyword(s):  
Methylene Blue ◽  
Free Energy ◽  
Sodium Dodecyl Sulfate ◽  
Mixed Solvent ◽  
Volume Fraction ◽  
Sodium Dodecyl ◽  
Standard Free Energy ◽  
Solvent System ◽  
Volume Fractions ◽  
Dodecyl Sulfate

The surface activity and the process of micellization of sodium dodecyl sulfate (SDS) with methylene blue (MB) in a methanol-water mixed solvent system were investigated by tensiometry and conductometry at 298.15 K. The measurements of surface tension and conductivity of SDS-MB complex were carried up to 0.3 volume fractions of methanol because the resulting complex appeared turbid above 0.3 volume fractions of methanol. The critical micelle concentration (CMC) of the SDS was determined from both tensiometry and conductometry. The CMC of SDS increased with the increasing volume fraction of methanol due to the inclusion of methanol in the micelles and decreased in the presence of methylene blue due to the reduction of electrostatic repulsion within the anionic moiety of SDS by the positive charge of the added dye. Different properties like surface excess concentration Γ max , minimum surface area A min , Gibbs free energy of micellization Δ G m o , surface pressure ( π CMC ), efficiency of a surfactant ( p C 20 ), packing parameter P , and standard free energy interfacial adsorption Δ G ads o of SDS in the absence/presence of MB were calculated. On the basis of Δ G m o values, it was noticed that the increasing volume fraction of methanol disfavors the micellization of SDS, while the presence of MB increased the efficiency of SDS making the micellization process more spontaneous.

Conductance of Sodium dodecyl sulphate in Presence and in Absence of KCl and NaBr in Methanol-Water mixed solvent media at 308. 15 K

2013 ◽  
Vol 29 ◽  
pp. 5-10
Author(s):  
Tulasi Prasad Niraula ◽  
Sujeet Kumar Chatterjee ◽  
Ajaya Bhattarai
Keyword(s):  
Sodium Dodecyl Sulphate ◽  
Sharp Increase ◽  
Mixed Solvent ◽  
Sodium Dodecyl ◽  
Volume Fractions

Correction: On 10/01/2014, the first author of this paper was changed from Tulsi Ram Niraula to Tulasi Prasad NiraulaPrecise measurements on conductivity of sodium dodecyl sulphate in presence and in absence of KCl and NaBr in methanol-water mixed solvent media containing 0.1, 0.2, 0.3, and 0.4 volume fractions of methanol at 308.15K are reported. The concentrations were varied from ~ 0.001 to ~ 0.05 mol-1. The results showed a sharp increase in conductivity with increase in concentration of sodium dodecyl sulphate. Also,the conductivity of sodium dodecyl sulphate increases with addition of salts. The conductivity of sodium dodecyl sulphate decreases with increase in amount of methanol. The conductance of sodium dodecyl sulphate is found more in presence of KCl than NaBr in methanol-water mixed solvent media containing 0.1, 0.2, 0.3, and 0.4 volume fractions of methanol. DOI: http://dx.doi.org/10.3126/jncs.v29i0.9230Journal of Nepal Chemical SocietyVol. 29, 2012Page: 5-10Uploaded date : 12/3/2013

scholarly journals Influence of Valsartan on the thermodynamics of micellization of anionic surfactant Sodium Dodecyl Sulphate

2016 ◽  
Vol 63 (2) ◽  
pp. 30-36
Author(s):  
L. Stopková ◽  
A. Hriňaková ◽  
Ž. Bezáková ◽  
F. Andriamanty ◽  
V. Žufková
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Uv Spectrophotometry ◽  
Micellar Media ◽  
Different Temperatures ◽  
Enthalpy And Entropy

AbstractIn this manuscript was investigated behaviour of drug valsartan by micellar media of anionic surfactant sodium dodecyl sulphate. As the method was used electrical conductivity for the determination of critical micelle concentration at different temperatures (T = 293.15 - 313.15 K), as well as calculated thermodynamic parameters like standard Gibbs free energy, enthalpy and entropy of micellization. According to contribution of Gibbs free energy is the process of micellization primarily controlled by entropy. Solubilization of valsartan was studied in surfactant system at 298.15 K and physiological conditions pH 7.4 using UV-spectrophotometry at different concentration range (0.001 - 0.07 mol/l) of sodium dodecyl sulphate. The solubilization of drug was observed with increasing concentration of surfactant in aqueous solution.

scholarly journals Effects of concentration, relative permittivity on the transport properties of Sodium dodecyl sulphate in presence and in absence of potassium bromide and Sodium chloride in methanol-water mixed solvent media at 308. 15 K

BIBECHANA ◽  
2012 ◽  
Vol 9 ◽  
pp. 159-164
Author(s):  
Tulasi Prasad Niraula ◽  
Ajaya Bhattarai ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Sodium Chloride ◽  
Transport Properties ◽  
Sodium Dodecyl Sulphate ◽  
Relative Permittivity ◽  
Sharp Increase ◽  
Mixed Solvent ◽  
Sodium Dodecyl ◽  
Potassium Bromide ◽  
Volume Fractions

Precise measurements on conductivity of sodium dodecyl sulphate in presence and in absence of KBr and NaCl in methanol-water mixed solvent media containing 0.1, 0.2 and 0.4 volume fractions of methanol at 308.15K are reported. The concentrations were varied from ~ 0.001 to ~ 0.03 mol.l-1. The results showed a sharp increase in conductivity with increase in concentration of sodium dodecyl sulphate. Also, the conductivity of sodium dodecyl sulphate increases with addition of salts. The conductivity of sodium dodecyl sulphate decreases with increase in amount of methanol. The conductance of sodium dodecyl sulphate is found more in presence of KBr than NaCl in methanol-water mixed solvent media containing 0.1, 0.2 and 0.4 volume fractions of methanol. DOI: http://dx.doi.org/10.3126/bibechana.v9i0.7191 BIBECHANA 9 (2013) 159-164

The Kinetics of Methyl Methacrylate Miniemulsion Polymerization Characterized through a Fluorescence Method

2012 ◽  
Vol 178-181 ◽  
pp. 609-612
Author(s):  
Hai Ke Feng ◽  
Hua Yu Qiu ◽  
Li Yuan Ding ◽  
Cun Jin Xu
Keyword(s):  
Methyl Methacrylate ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Miniemulsion Polymerization ◽  
Time Measurement ◽  
Fluorescence Method ◽  
Real Time Measurement ◽  
Measurement Results ◽  
Kinetics Of

In this paper, we followed the kinetics of methyl methacrylate (MMA) through a novel fluorescence method. The real-time measurement results show that in the regime of very low monomer contents, such as a solution containing 0.1 wt% of MMA with respect to water and with the anionic surfactant of sodium dodecyl sulphate (SDS), the kinetic of the miniemulsion could be followed by this embed fluorescence method. The processes of changing from emulsion to miniemulsion with different amount of surfactant and cosurfactant also have been monitored.

scholarly journals Effect of solvent composition on the critical micelle concentration of sodium deoxycholate in ethanol-water mixed solvent media

BIBECHANA ◽  
2012 ◽  
Vol 9 ◽  
pp. 63-68 ◽  
Author(s):  
Ajaya Bhattarai ◽  
Sujit Kumar Shah ◽  
Ashok Kumar Yadav ◽  
Janak Adhikari
Keyword(s):  
Critical Micelle Concentration ◽  
Precise Measurement ◽  
Mixed Solvent ◽  
Volume Fraction ◽  
Pure Water ◽  
Specific Conductivity ◽  
Sodium Deoxycholate ◽  
Solvent Composition ◽  
Effect Of Solvent

The precise measurement of the specific conductivity of sodium deoxycholate in pure water and ethanolwater mixed solvent media containing 0.10 and 0.20 volume fraction of ethanol at 303.15 K are reported. The concentration were varied from ~ 0.01 mol L-1 to ~ 0.0002 mol L-1.The conductivity of sodium deoxycholate decreases with the increase in the volume fraction of ethanol. The critical micelle concentration of sodium deoxycholate increases with the increase in the volume fraction of ethanol. DOI: http://dx.doi.org/10.3126/bibechana.v9i0.7176 BIBECHANA 9 (2013) 63-68

scholarly journals Conductivity Study of DTAB in Water and Ethanol-Water Mixture in the Presence and Absence of ZnSO4

2020 ◽  
Vol 17 (4) ◽  
pp. 1207
Author(s):  
Sangita Acharya ◽  
Tulasi Niraula ◽  
Ajaya Bhattarai
Keyword(s):  
Free Energy ◽  
Critical Micelle Concentration ◽  
Volume Fraction ◽  
Standard Free Energy ◽  
Water Mixture ◽  
Dodecyltrimethylammonium Bromide ◽  
Degree Of Dissociation ◽  
Ethanol Content ◽  
Presence And Absence ◽  
Free Energy Of Micellization

The physicochemical behaviour of dodecyltrimethylammonium bromide (DTAB) in water and ethanol-water mixture in the presence and absence of ZnSO4 were studied by measuring the conductivity at 298.15 K. The pre-micellar (S1) and post-micellar slopes (S2) were obtained and calculated the degree of dissociation (α) and the critical micelle concentration (cmc). With an increase in ethanol content, the cmc and α of DTAB increased whereas, in the presence of ZnSO4, the cmc and α decreased. By using cmc and α, thermodynamic properties as the standard free energy of micellization ( ) were evaluated. With an increase in ethanol content, the negative values of  are decreased indicating less spontaneous in the micellization which makes micellization less favourable. The correlation of the pre-micellar and post-micellar slopes with the volume fraction of ethanol were discussed. DTAB micellization was tested in contexts of specific solvent parameters and solvophobic parameter.

scholarly journals Study of Elodea canadensis elimination of Sodium Dodecyl Sulphate and NH4Cl

2021 ◽  
Vol 866 (1) ◽  
pp. 012025
Author(s):  
S E Sergienko ◽  
S S Timofeeva ◽  
A B Kupchinsky ◽  
G Chaneva ◽  
D I Stom ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Ammonium Nitrogen ◽  
Elodea Canadensis ◽  
Initial Value ◽  
Dodecyl Sulfate ◽  
Negative Effect ◽  
Wet Weight

Abstract The absorption of an anionic surfactant - sodium dodecyl sulfate (SDS) by a Elodea canadensis was studied. Macrophyte (20 g/L wet weight) reduced the concentration of this surfactant from 2 mg/L by 90% within 2 days. A negative effect of SDS on the elimination of ammonium nitrogen by E. canadensis was shown with its content from 1·10-4 M. Thus, in the presence of 1·10-4 M SDS, E. canadensis reduced the concentration of ammonium nitrogen by 51% of the initial value in 2 days (in the control - without surfactants - 92% of the pollutant was absorbed).

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.

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