Salt-induced counterion condensation and related phenomena in sodium carboxymethylcellulose–sodium halide–methanol–water quaternary systems

Soft Matter ◽  
2015 ◽  
Vol 11 (20) ◽  
pp. 4133-4140 ◽  
Author(s):  
Bijan Das ◽  
Amritendu Chatterjee
Keyword(s):  
Mixed Solvent ◽  
Counterion Condensation ◽  
Sodium Carboxymethylcellulose ◽  
Volume Fractions ◽  
Quaternary Systems ◽  
Frictional Behaviour

Transport and frictional behaviour of sodium carboxymethylcellulose dissolved in methanol–water mixed solvent media with varying volume fractions (v) of methanol have been investigated conductometrically in presence of different concentrations of NaCl and NaBr.

scholarly journals Electrical Conductivity of a Semidilute Polyelectrolyte in Mixed Solvent Media

1970 ◽  
Vol 9 ◽  
pp. 163-170 ◽  
Author(s):  
Ajaya Bhattarai
Keyword(s):  
Electrical Conductivity ◽  
Theoretical Prediction ◽  
Key Words ◽  
Sodium Salt ◽  
Mixed Solvent ◽  
Dilute Solution ◽  
Counterion Condensation ◽  
Semidilute Solutions ◽  
Experimental Conductivity ◽  
Added Salt

The electrical conductivity of solutions of sodium salt of polystyrenesulfonate in methanol-water mixed solvent media containing 8, 16, 25, and 34 weight per cent of methanol at 308.15, 313.15, 318.15 and 323.15 K was studied earlier. In that report, an attempt was made to interprete the results using the Manning Counterion Condensation Theory. Unfortunately, a major deviation of the theoretical prediction from the experimental results was noticed and the possible reasons for this discrepancy have been discussed. In this communication, the experimental conductivity have been analyzed on the basis of a new model for semi-dilute polyelectrolyte conductivity which takes into electrical conductivity of semidilute solutions of polyelectrolytes without added salt has been recently described by Colby et al. (1997) using the scaling description proposed by Dobrynin et al. (1995) for the configuration of a polyelectrolyte chain in semi-dilute solution. The predictions are found to be compared favorably well with the observed conductivity over the whole range of concentrations investigated. Key Words: conductivity; counterion; condensation; semi-dilute; Manning theory DOI: 10.3126/njst.v9i0.3182 Nepal Journal of Science and Technology 9 (2008) 163-170

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.

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 Effect of Methanol on Viscosity of Aqueous Solutions of Cationic Surfactants at 298.15 to 323.15 K

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Sujit Kumar Shah ◽  
Sujeet Kumar Chatterjee ◽  
Ajaya Bhattarai
Keyword(s):  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Cationic Surfactants ◽  
Cetyltrimethylammonium Bromide ◽  
Mixed Solvent ◽  
Relative Viscosity ◽  
Dodecyltrimethylammonium Bromide ◽  
Solvent Interactions ◽  
Volume Fractions ◽  
Surfactant Solutions

Viscosity measurements have been made to the solutions of dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) in 0.10, 0.20, 0.30, and 0.40 volume fractions of methanol in methanol-water mixed solvent media at 298.15, 308.15, 318.15, and 323.25 K. Critical micelle concentration (CMC) values have been determined. From relative viscosity for surfactant solutions, related viscosityBcoefficients are calculated and the values are interpreted in terms of solute-solvent interactions.

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

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