scholarly journals Effect of Solvent Composition on the Critical Micelle Concentration of Cetylpyridinium Chloride in Ethanol-Water Mixed Solvent Media

2013 ◽  
Vol 13 (1) ◽  
pp. 89-93 ◽  
Author(s):  
Ajaya Bhattarai ◽  
Sujit Kumar Shah ◽  
Ashok Kumar Yadav
Keyword(s):  
Critical Micelle Concentration ◽  
Room Temperature ◽  
Mixed Solvent ◽  
Volume Fraction ◽  
Science And Technology ◽  
Pure Water ◽  
Specific Conductivity ◽  
Cetylpyridinium Chloride ◽  
Solvent Composition ◽  
Effect Of Solvent

The accurate measurement of the specific conductivity of cetylpyridinium chloride in pure water and ethanol-water mixed solvent media containing 0.10, 0.20, 0.30 and 0.40 volume fraction of ethanol at room temperature are reported. The concentrations were varied from ~ 0.005 mol l-1 to ~ 0.0002 mol l-1.The conductivity of cetylpyridinium chloride decreases with the increase in the volume fraction of ethanol. The critical micelle concentration of cetylpyridinium chloride increases with the increase in the volume fraction of ethanol. Nepal Journal of Science and Technology Vol. 13, No. 1 (2012) 89-93 DOI: http://dx.doi.org/10.3126/njst.v13i1.7446

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 Micellization behavior of mixed surfactants in pure water and methanol-water mixed solvent media by density methods

BIBECHANA ◽  
2015 ◽  
Vol 13 ◽  
pp. 114-120
Author(s):  
Ajaya Bhattarai ◽  
Kavita Pathak ◽  
Bikash Dev
Keyword(s):  
Room Temperature ◽  
Mixed Solvent ◽  
Volume Fraction ◽  
Pure Water ◽  
Sodium Dodecylsulfate ◽  
Entire Concentration Range ◽  
Density Methods ◽  
The Given ◽  
Rich Mixtures ◽  
Micellization Behavior

The properties of anionic-rich and cationic-rich mixtures of dodecyltrimethylammonium bromide (DTAB) and sodium dodecylsulfate (SDS) in pure water and methanol-water mixed solvent media were studied using density measurements at room temperature. The results showed that density increases with increasing concentration of surfactant mixture over the entire concentration range investigated in pure water and in the given mixed solvent media and which are found to decrease with an increase in the volume fraction of methanol in the solvent composition. The critical micelle concentration increases with the increase in volume fraction of methanol for both the anionic-rich (SDS-DTAB) and cationic-rich (DTAB-SDS) systems.BIBECHANA 13 (2016) 114-120

scholarly journals Effects of concentration and solvent composition on the electrical conductivity of sodium bromide in pure water and ethanol-water mixed solvent media

2013 ◽  
Vol 8 (2) ◽  
pp. 1-6 ◽  
Author(s):  
Ajaya Bhattarai ◽  
Sanjay Neupane
Keyword(s):  
Electrical Conductivity ◽  
Sharp Increase ◽  
Room Temperature ◽  
Mixed Solvent ◽  
Electrolyte Concentration ◽  
Pure Water ◽  
Solvent Composition ◽  
Sodium Bromide ◽  
Volume Fractions ◽  
Engineering And Technology

Precise measurements on the conductivity of Sodium Bromide in pure water and ethanol-water mixed solvent media containing 0.10, 0.20, 0.30, 0.40, 0.50 and 0.60 volume fractions of ethanol at room temperature are reported. The concentrations were varied from ~ 0.010 to ~ 0.10 mol.L-1. The results showed a sharp increase in the conductivity with increasing electrolyte concentration. The conductivity of electrolyte decreases with increase in the amount of ethanol.Kathmandu University Journal of Science, Engineering and Technology Vol. 8, No. II, December, 2012, 1-6 DOI: http://dx.doi.org/10.3126/kuset.v8i2.7318 

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

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 The Effects of Concentration, Temperature and Solvent Composition on Partial Molar Volumes of Cetyltrimethylammonium Bromide in Methanol-Water mixed Solvent Media

1970 ◽  
Vol 24 ◽  
pp. 24-30 ◽  
Author(s):  
Sujit Kumar Shah ◽  
Ajaya Bhattarai ◽  
Ghanashyam Shrivastav ◽  
Sujeet Kumar Chatterjee
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Mixed Solvent ◽  
Pure Water ◽  
Partial Molar Volumes ◽  
Chemical Society ◽  
Solvent Composition ◽  
Entire Concentration Range ◽  
Molar Volumes ◽  
Increasing Temperature ◽  
Bromide Solutions

The author Ajay Bhattarai was changed to Ajaya Bhattarai and the author Kumar Chatterjee was changed to Sujeet Kumar ChatterjeePrecise measurements on the density of cetyltrimethylammonium bromide solutions in pure water and in methanol(1) + water (2) mixed solvent media containing 0.10, 0.20 and 0.30 volume fractions of methanol at 308.15, 318.15 and 323.15 K are carried out to calculate the partial molar volumes. The concentrations are varied from 0.3 - 1.0 x 10-1 mol.l-1. The results showed almost constant on the partial molar volumes with increasing surfactant concentration. Also, the partial molar volumes are found to increase with increasing temperature over the entire concentration range investigated in a given mixed solvent medium and these values are found to decrease with increasing methanol content in the solvent composition. Keywords: Mixed solvent; Cetyltrimethylammonium bromide; Surfactan; Partial molarDOI: 10.3126/jncs.v24i0.2383 Journal of Nepal Chemical Society, Vol. 24, 2009 Page: 24-30

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

The Study on Microstructural and Optical Properties of Nanocrystalline Germanium Films

2010 ◽  
Vol 663-665 ◽  
pp. 324-327
Author(s):  
Chao Song ◽  
Rui Huang
Keyword(s):  
Multilayer Structure ◽  
Room Temperature ◽  
Multilayer Film ◽  
Volume Fraction ◽  
Raman Scattering Spectroscopy ◽  
Force Microscopy ◽  
Room Temperature Photoluminescence ◽  
Atomic Force ◽  
Lower Volume Fraction ◽  
Lower Volume

The germanium film and Ge/Si multilayer structure were fabricated by magnetron sputtering technique on silicon substrate at temperatures of 500°C. Raman scattering spectroscopy measurements reveal that the nanocrystalline Ge occurs in both kinds of samples. Furthermore, from the atomic force microscopy (AFM) results, it is found that the grain size as well as spatially ordering distribution of the nc-Ge can be modulated by the Ge/Si multilayer structure. The room temperature photoluminescence was also observed in the samples. However, compared with that from the nc-Ge film, the intensity of PL from the nc-Ge/a-Si multilayer film becomes weaker, which is attributed to its lower volume fraction of crystallized component.

scholarly journals Effect of Trace Impurities in Pure Water on Corrosion of Carbon Steel at Room Temperature

1984 ◽  
Vol 33 (12) ◽  
pp. 689-693
Author(s):  
Takashi Honda ◽  
Eiji Kashimura ◽  
Akira Minato
Keyword(s):  
Carbon Steel ◽  
Room Temperature ◽  
Pure Water ◽  
Trace Impurities
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