Electrical Conductance of Sodium Dodecyl Sulfate in Calcium Nitrate Tetrahydrate + Acetamide Melts

and, S. Dev; Ismail, K.

doi:10.1021/je000333b

Cited by 9 publications

(5 citation statements)

References 25 publications

(37 reference statements)

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“…The conductivity study for ionic surfactants are very popular [1][2][3][4][5] . The addition of an electrolyte will, in general, tend to induce the formation of aggregates at concentrations below the critical micelle concentration (cmc) of the pure surfactant 6,7 .…”

Section: Introductionmentioning

confidence: 99%

CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE

2015

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Conductance measurement of sodium dodecylsulfate in the presence and in the absence of Na2SO4 and ZnSO4 in aqueous media was done. The results showed sharp increase in conductance with increase in concentration of sodium dodecylsulfate. Also, the conductance increases with addition of salts. The conductance of sodium dodecylsulfate is found more in the presence of Na2SO4 than ZnSO4 in aqueous media. In the presence of salts, the critical micelle concentration (cmc) value decreases which are explained on the basis of the nature and ion size of the added ion. The graph of conductance versus concentration is used in determining the critical micelle concentration (cmc).Scientific World, Vol. 12, No. 12, September 2014, page 41-43

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Section: Introductionmentioning

confidence: 99%

CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE

2015

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“…Since addition of inorganic salts lowers the melting temperature of acetamide considerably, molten binary and ternary mixtures of acetamide with metal halides have been used as reaction media and also in thermal salt cells to produce electricity. , The possibility of using acetamide as a suitable medium for electrodeposition of metals from salt solutions has also been investigated . Several other aspects such as ion conductance and micellization of surfactants in molten acetamide have been studied by several authors to understand the role of the ion−solvent interactions in controlling the ion transport and self-aggregation in this medium. – …”

Section: Introductionmentioning

confidence: 99%

Fluorescence Spectroscopic Studies of (Acetamide + Sodium/Potassium Thiocyanates) Molten Mixtures: Composition and Temperature Dependence

et al. 2010

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Steady state and time-resolved fluorescence spectroscopic techniques have been used to explore the Stokes' shift dynamics and rotational relaxation of a dipolar solute probe in molten mixtures of acetamide (CH(3)CONH(2)) with sodium and potassium thiocyanates (Na /KSCN) at T approximately 318 K and several other higher temperatures. The dipolar solute probe employed for this study is coumarin 153 (C153). Six different fractions (f) of KSCN of the following ternary mixture composition, 0.75 CH(3)CONH(2) + 0.25[(1 - f)NaSCN + fKSCN], have been considered. The estimated experimental dynamic Stokes' shift for these systems ranges between 1800 and 2200 cm(-1) (+/-250 cm(-1)), which is similar to what has been observed with the same solute probe in several imidazolium cation based room temperature ionic liquids (RTIL) and in pure amide solvents. Interestingly, this range of estimated Stokes' shift, even though not corresponding to the megavalue of static dielectric constant reported in the literature for a binary mixture of molten CH(3)CONH(2) and NaSCN, exhibits a nonmonotonic KSCN concentration dependence. The magnitudes of the dynamic Stokes' shift detected in the present experiments are significantly less than the estimated ones, as nearly 40-60% of the total shift is missed due to the limited time resolution employed (full-width at half-maximum of the instrument response function approximately 70 ps). The solvation response function, constructed from the detected shifts in these systems, exhibits triexponential decay with the fastest time constant (tau(1)) in the 10-20 ps range, which might be much shorter if measured with a better time resolution. The second time constant (tau(2)) lies in the 70-100 ps range, and the third one (tau(3)) ranges between 300 and 800 ps. Both these time constants (tau(2) and tau(3)) show alkali metal ion concentration dependence and exhibit viscosity decoupling at higher viscosity in the NaSCN-enriched region. Time dependent rotational anisotropy has been found to be biexponential at all mixture compositions studied. Both the average solvation () and rotation () times of C153 in these mixtures exhibit fractional power law dependence on medium viscosity ( is proportional to eta(p), x being solvation or rotation). For solvation, p is found to be 0.46, which is very different from that obtained for common polar and nonpolar solvents, and RTILs (p approximately = 1). For rotation, p approximately = 0.65, which is again different from the value (p approximately = 1) obtained for common polar solvents and RTILs but very similar to that (p approximately = 0.6) found for nonpolar solvents. In addition, experimentally measured average rotation times in these mixtures are found to exhibit slip behavior in the low eta/T region, which gradually transforms to subslip as eta/T increases. Calculations using a recently developed semimolecular theory predict a total dynamic Stokes' shift for C153 (dipolar solute) in these molten mixtures near approximately 1600 cm(-1) where the...

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“…A thermostated oil bath (INSREF make) was used to maintain the temperature at (89 ± 0.1) °C. The method of preparing the molten mixtures and measuring their electrical conductances is similar to that described in our earlier work . The uncertainty in the measured specific conductivity (κ) values was found to be ±0.5%.…”

Section: Methodsmentioning

confidence: 97%

Specific Conductivity Maxima of Ionic Surfactants in Acetamide Melt

2004

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The specific conductivity of sodium dodecyl sulfate, cetyl pyridinium chloride, and sodium nitrate in acetamide melt was measured at 89°C up to (2.067, 1.599, and 3.705) mol‚kg-1 , respectively. The specific conductivity maximum has been observed for sodium nitrate as well as for the two ionic surfactants. This is the first report on the observation of a specific conductivity maximum for any ionic surfactant, which is otherwise a general feature of a normal electrolyte in aqueous or nonaqueous media. In acetamide melt, the concentrations of sodium dodecyl sulfate and cetyl pyridinium chloride corresponding to their conductivity maxima are found to be less than that of sodium nitrate, which is probably due to micellization of ionic surfactants.

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Electrical Conductance of Sodium Dodecyl Sulfate in Calcium Nitrate Tetrahydrate + Acetamide Melts

Cited by 9 publications

References 25 publications

CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE

CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE

Fluorescence Spectroscopic Studies of (Acetamide + Sodium/Potassium Thiocyanates) Molten Mixtures: Composition and Temperature Dependence

Specific Conductivity Maxima of Ionic Surfactants in Acetamide Melt

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