Aggregation of sodium dodecylsulfate in aqueous nitric acid medium

Dey, Jahar; Ismail, K.

doi:10.1016/j.jcis.2012.04.015

Cited by 16 publications

(4 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The replacement of Na + by H + ions in the micellar phase indicates the possible protonation of the anionic head groups of SaS in the presence of HNO3. Thus, in this case, the SaS micellar solution contains Na + and H + counterions, which tend to bind to the ionic micelle and form ion pairs [17,18]. In addition, it should be noted that the presence of nitric acid in a SaS solution, in addition to electrostatic interactions, could also lead to chemical ones, in particular to SaS hydrolysis.…”

Section: Discussionmentioning

confidence: 97%

Colloid-chemical properties of surfactant–nitric acid–water systems

Danilin,

Lugovitskaya,

Kolmachikhina

et al. 2023

Chim.Tech.Acta

View full text Add to dashboard Cite

The behavior of the surfactants Tween 80, SaS and alkyl betaine in aqueous and nitric acid environments as promising additives for nitrate leaching of hard-to-process ore concentrates of non-ferrous metals was studied. The influence of surfactant concentration (0.04–1.28 g/dm3), nitric acid concentration (0.1–10 g/dm3) and temperature (295–343 K) on the surface tension, critical micelle concentration (CMC), pH and optical density of aqueous surfactant solutions and surfactant–HNO3–H2O systems was found. The critical micelle concentration of the surfactants used was estimated. A positive effect of nitric acid on the surface activity of surfactants was discovered, which manifests itself in a decrease in both the CMC and the surface tension at the liquid–gas interface. The values of surface activity and Gibbs energy of surfactant micelle formation in aqueous and nitric acid media were calculated. Associative processes in the solutions and compositions were confirmed by measuring the optical density of the systems under study.

show abstract

Section: Discussionmentioning

confidence: 97%

Colloid-chemical properties of surfactant–nitric acid–water systems

Danilin,

Lugovitskaya,

Kolmachikhina

et al. 2023

Chim.Tech.Acta

View full text Add to dashboard Cite

show abstract

“…Sodium dodecyl sulfate (SDS), an anionic surfactant, is known to undergo hydrolysis. 18 In a recent study 19 on the aggregation behavior of SDS in aqueous nitric acid, we detected from conductivity data hydrolysis of the surfactant when the concentration of HNO 3 was about 0.02 M or more. Visualizing that hydrolysis of SDS monomers might facilitate the formation of nitronium ions, 19 it occurred to us that an aqueous solution of SDS-HNO 3 (with concentration > 0.02 M) may act as a nitrating mixture.…”

Section: Introductionmentioning

confidence: 96%

“…18 In a recent study 19 on the aggregation behavior of SDS in aqueous nitric acid, we detected from conductivity data hydrolysis of the surfactant when the concentration of HNO 3 was about 0.02 M or more. Visualizing that hydrolysis of SDS monomers might facilitate the formation of nitronium ions, 19 it occurred to us that an aqueous solution of SDS-HNO 3 (with concentration > 0.02 M) may act as a nitrating mixture. Accordingly, we report in this paper a simple methodology for the nitration of aromatic compounds that offers a mild route to the synthesis of monosubstituted products in aqueous medium at room temperature.…”

Section: Introductionmentioning

confidence: 96%

Regioselective nitration of aromatic compounds in an aqueous sodium dodecylsulfate and nitric acid medium

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Scattered reports on micellar catalysis by SDS in the presence of some strong acids showed evidently unexpected variations in rate constant obtained with acid concentrations or pHs [12,15,16]. However, in many of these reports, high concentrations of acids have been used with little or no considerations for the effect of the acids on the micellisation process and very few works are known on the interaction of SDS with these strong electrolytes [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and FTIR studies of the interactions between sodium dodecyl sulphate and strong acids – atypical conductivity pattern

Ogunlusi

Ige

Owoyomi

2013

Physics and Chemistry of Liquids

View full text Add to dashboard Cite

Micellisation of sodium dodecyl sulphate (SDS) was studied in the presence of hydrochloric acid (HCl) and perchloric acid (HClO 4 ) using conductometry method. The conductivity-[SDS] plots showed abnormal profile pattern at [HCl] > 0.002 mol dm −3 and [HClO 4 ] > 0.001 mol dm −3 . Below these acid concentrations, conductivity pattern was normal, and the critical micelle concentration (CMC) values of SDS were lower in both acids than in water. At high acid concentrations, post-micellar slopes were negative. Fourier transform infrared (FTIR) analysis showed significant shifts in the bands suggesting the formation of dodecyl hydrogen sulphate by SDS at high acid concentrations. Thermodynamic parameters for SDS micellisation at low acid concentrations ([HCl] = 0.002 mol dm −3 and [HClO 4 ] = 0.001 mol dm −3 ) were determined in the temperature range 15-40°C. As temperature increases, the change in enthalpy and entropy of micellisation becomes less positive, and the change in free energy of micellisation becomes increasingly negative.

show abstract

Aggregation of sodium dodecylsulfate in aqueous nitric acid medium

Cited by 16 publications

References 41 publications

Colloid-chemical properties of surfactant–nitric acid–water systems

Colloid-chemical properties of surfactant–nitric acid–water systems

Regioselective nitration of aromatic compounds in an aqueous sodium dodecylsulfate and nitric acid medium

Thermodynamic and FTIR studies of the interactions between sodium dodecyl sulphate and strong acids – atypical conductivity pattern

Contact Info

Product

Resources

About