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

2015 ◽  
Vol 12 (12) ◽  
pp. 41-43 ◽  
Author(s):  
Ajaya Bhattarai ◽  
S K Shah ◽  
Kuber Limbu
Keyword(s):  
Critical Micelle Concentration ◽  
Sharp Increase ◽  
Room Temperature ◽  
Aqueous Media ◽  
Sodium Dodecylsulfate ◽  
Conductance Measurement ◽  
Scientific World ◽  
Presence And Absence ◽  
Ion Size ◽  
Versus Concentration

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        

scholarly journals Determination of critical micelle concentration of cetyltrimethylammonium bromide in presence and absence of KCl and NaCl in aqueous media at room temperature by viscosity measurement

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 131-135 ◽  
Author(s):  
Kabita Jha ◽  
Ajaya Bhattarai ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Ionic Strength ◽  
Critical Micelle Concentration ◽  
Sharp Increase ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Aqueous Media ◽  
Viscosity Measurement ◽  
Reference List ◽  
Versus Concentration

NOTE: The correct reference list was added to this article on 08/07/2014.Viscosity measurement of cetyltrimethylammonium bromide in presence and in absence of KCl and NaCl in aqueous media is done. The results showed a sharp increase in viscosity with increase in concentration of cetyltrimethylammonium bromide. Also, the viscosity increases with addition of salts. The viscosity of cetyltrimethylammonium bromide is found more in presence of KCl than NaCl in aqueous media. In presence of monovalent salts, the critical micelle concentration (cmc) value decreases which is explained on the basis of nature and ionic strength of the added ion. The graphs of viscosity versus concentration are used in determining the critical micelle concentration (cmc). DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10392BIBECHANA 11(1) (2014) 131-135

scholarly journals Surface Tension Studies on the Micellization of Cetyltrimethylammonium Bromide in Presence and Absence of KCL and NaCl in Aqueous Media at Room Temperature

BIBECHANA ◽  
2013 ◽  
Vol 10 ◽  
pp. 52-57 ◽  
Author(s):  
Kabita Jha ◽  
Ajaya Bhattarai ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Surface Tension ◽  
Free Energy ◽  
Critical Micelle Concentration ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Aqueous Media ◽  
Sharp Decrease ◽  
Presence And Absence ◽  
Versus Concentration

NOTE: on 27th May 2014 in the abstract, the sentence"The surface tension of cetyltrimethylammonium bromide is found less in presence of KCl than NaCl in aqueous media" was changed to read "The surface tension of cetyltrimethylammonium bromide is found more in presence of KCl than NaCl in aqueous media."In the Conclusion (p.56) the sentence"The surface tension of cetyltrimethylammonium bromide is found less in presence of KCl than NaCl in aqueous media." was changed to read"The surface tension of cetyltrimethylammonium bromide is found more in presence of KCl than NaCl in aqueous media." Precise measurements on Surface tension of cetyltrimethylammonium bromide in presence and in absence of KCl and NaCl in aqueous media are reported. The results showed a sharp decrease in surface tension with increase in concentration of cetyltrimethylammonium bromide and then almost constant value of surface tension was observed. Also, the surface tension decreases with addition of salts. The surface tension of cetyltrimethylammonium bromide is found less in presence of KCl than NaCl in aqueous media. In presence of monovalent salts, the critical micelle concentration (cmc) value decreases which is explained on the basis of the orientation of the surfactant and reduction of the free energy of the surface, thus decreasing surface tension. The graphs of surface tension versus concentration are used in determining the critical micelle concentration (cmc). BIBECHANA 10 (2014) 52-57 DOI: http://dx.doi.org/10.3126/bibechana.v10i0.9311

scholarly journals Micellization Behavior of Cetyltrimethylammonium bromide in Presence and Absence of Na2SO4 and MgSO4 in Aqueous media

BIBECHANA ◽  
2016 ◽  
Vol 14 ◽  
pp. 77-85 ◽  
Author(s):  
Chom Nath Adhikari ◽  
G S Shrivastav ◽  
Ajaya Bhattarai
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Cetyltrimethylammonium Bromide ◽  
Pure Water ◽  
Aqueous Media ◽  
Presence And Absence ◽  
Micellization Behavior

Viscosity and surface tension measurements of cetyltrimethylammonium bromide (CTAB) in presence and absence of Na2SO4 and MgSO4 in aqueous media are reported. The results showed an increase in viscosity with increase in concentration of cetyltrimethylammonium bromide in presence and absence of salts where as the decrease in surface tension with increase in concentration of cetyltrimethylammonium bromide in presence and absence of salts. The viscosity of CTAB was observed lowest in pure water and increases in presence of MgSO4 and then more increases in presence of Na2SO4 where as the surface tension of CTAB was observed highest in pure water and decreases in presence of Na2SO4 and then more decreases in presence of MgSO4.The critical micelle concentration (cmc) of CTAB decreases in presence of salts in both viscosity and surface tension measurements. The decreasing cmc of CTAB are found to be more in the presence of Na2SO4 in comparison with the presence of MgSO4 for both measurements. The graphs of viscosity versus log[C] and the surface tension versus log[C] are used in determining the critical micelle concentration (cmc).        BIBECHANA 14 (2017) 77-85

scholarly journals Micellisation behavior on the dodecyltrimethylammonium bromide in the presence of Brij-35 in pure water by conductivity measurement

BIBECHANA ◽  
2017 ◽  
Vol 15 ◽  
pp. 85-89
Author(s):  
Neelam Shahi ◽  
Ajaya Bhattarai
Keyword(s):  
Free Energy ◽  
Sharp Increase ◽  
Pure Water ◽  
Specific Conductivity ◽  
Aqueous Media ◽  
Conductivity Measurement ◽  
Ammonium Bromide ◽  
Dodecyltrimethylammonium Bromide ◽  
Brij 35 ◽  
Versus Concentration

Conductivity measurement of dodecyltrimethylammonium bromide in the presence of Brij-35 in aqueous media at 289.15 K is performed. The result showed a sharp increase in conductivity with increase in the concentration of dodecyltrimethylammonium bromide in the presence of Brij-35. The graph of specific conductivity versus concentration is used in determining the critical micelle concentration (CMC). There is the decrease in CMC of  dodecyltrimethylammonium bromide in the presence of  Brij-35 in comparison with the CMC of  dodecyltrimethyl ammonium bromide [DTAB]. Gibbs free energy of micellisation has also been evaluated.   BIBECHANA 15 (2018) 85-89

scholarly journals Study of critical micelle concentration of cetyltrimethylammonium bromide (CTAB) in pure water in presence and absence of magnesium sulphate and sodium sulphae by measuring conductivity meter

BIBECHANA ◽  
2014 ◽  
Vol 11 ◽  
pp. 123-127 ◽  
Author(s):  
Ajaya Bhattarai ◽  
Ghanashyam Shrivastav ◽  
Chom Nath Adhikari
Keyword(s):  
Critical Micelle Concentration ◽  
Magnesium Sulphate ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Precise Measurement ◽  
Pure Water ◽  
Specific Conductivity ◽  
Sodium Sulphate ◽  
Distilled Water ◽  
Presence And Absence

The precise measurement of specific conductivity of cetyltrimethylammonium bromide (CTAB) in distilled water at room temperature was reported and also the specific conductivity of cetyltrimethylammonium bromide was measured in the presence of magnesium sulphate and sodium sulphate using a conductivity meter. The critical micelle concentration of three systems was calculated. The comparison of cmc among them was also performed. DOI: http://dx.doi.org/10.3126/bibechana.v11i0.10390 BIBECHANA 11(1) (2014) 123-127

Temperature Dependence of the Self-Assembled Styrene Based Random Ionomers in Aqueous Solution

2003 ◽  
Vol 775 ◽  
Author(s):  
Sung-Hwa Oh ◽  
Ju-Myung Song ◽  
Joon-Seop Kim ◽  
Hyang-Rim Oh ◽  
Jeong-A Yu
Keyword(s):  
Partition Coefficients ◽  
Room Temperature ◽  
Aqueous Media ◽  
The Self ◽  
Spectroscopic Methods ◽  
Ion Content ◽  
Repeat Units ◽  
Notable Effect ◽  
Order Of Magnitude ◽  
Experimental Errors

AbstractSolution behaviors of poly(styrene-co-sodium methacrylate) were studied by fluorescence spectroscopic methods using pyrene as a probe. The mol% of methacrylate was in the range 3.6–9.4. Water and N,N-dimethylforamide(DMF) mixture was used as a solvent (DMF/water = 0.2 mol %). The critical micelle (or aggregation) concentrations of ionomers and the partition coefficients of pyrene were obtained the temperature range 10–80°C. At room temperature, the values of CMCs (or CACs) were in the range 4.7 ×10-6 5.3 ×10-6 g/mL and we could not find any notable effect of the content of ionic repeat units within the experimental errors. Unlike CMCs, as the ion content increased, partitioning of pyrene between the hydrophobic aggregates and an aqueous media decreased from 1.5 ×105 to 9.4 ×104. As the temperature increased from 10 to 80 °C, the values of CMCs increased less than one order of magnitude. While, the partition coefficients of pyrene decreased one order of magnitude and the effect of the ion content became negligible.

One-Pot Synthesis of Water Soluble, Extremely Small-Sized Superparamagnetic Magnetite Nanoparticles

2012 ◽  
Vol 531 ◽  
pp. 219-222
Author(s):  
Li Hua Shen ◽  
Ting Shang ◽  
Jun Zhou ◽  
Dong Wang ◽  
Yu Han ◽  
...  
Keyword(s):  
Magnetite Nanoparticles ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Aqueous Media ◽  
Mri Contrast Agents ◽  
Water Soluble ◽  
Potential Candidate ◽  
One Pot ◽  
Mri Contrast

Extremely small-sized superparamagnetic magnetite nanoparticles of 3Cit). The resulting Cit-coated magnetite nanoparticles exhibited long-term colloidal stability in aqueous media without any surface modification. Regarding the magnetic properties, the nanoparticles were superparamagnetic at room temperature, and might be the potential candidate for MRI contrast agents.

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.

Influence of Surfactant Concentration on Laser-Based Gold Nanoparticle Formation and Stability

2012 ◽  
Vol 65 (2) ◽  
pp. 97 ◽  
Author(s):  
Yuen-Yan Fong ◽  
Jason R. Gascooke ◽  
Gregory F. Metha ◽  
Mark A. Buntine
Keyword(s):  
Critical Micelle Concentration ◽  
Laser Irradiation ◽  
Gold Nanoparticle ◽  
Sodium Dodecylsulfate ◽  
Formation Kinetics ◽  
Transmission Electron ◽  
Bulk Gold ◽  
Microscopy Images ◽  
Apparent Influence

The time evolution of gold nanoparticle (AuNP) yields by in-situ laser irradiation from bulk gold in aqueous solutions containing the surfactant sodium dodecylsulfate (SDS) at concentrations above and below the critical micelle concentration in water is reported. These studies are augmented by transmission electron microscopy images of AuNP samples at each SDS concentration recorded after 90 min of laser irradiation. The results show that while a low concentration of SDS plays a role in the formation kinetics, there is no apparent influence of the SDS concentration around the surfactant critical micelle concentration on particle size during AuNP production.

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