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 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 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

A Sensitive Formaldehyde Sensor Based on Cataluminescence Coupled with Thermal Desorption

2014 ◽  
Vol 670-671 ◽  
pp. 1163-1166 ◽  
Author(s):  
Hong Wei Yang ◽  
Zheng Xing ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Formaldehyde In Air ◽  
Benzene Toluene ◽  
Versus Concentration

A sensitive cataluminescence-based detecting technology using nanosized Mo4V6Ti10O47 as a probe was proposed for determination of formaldehyde in air. Trace formaldehyde was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 75°C to determine. The method showed high selectivity to formaldehyde at wavelength of 575nm, satisfying activity at temperature of 260°C and good stability at carrier flow rate of 145 ml/min. The linear range of CTL intensity versus concentration of formaldehyde was 0.04~78 mg/m3, and the detection limit (3σ) was 0.02 mg/m3. The recovery of artificial sample was 96.8%-103.4% by this method. There was no response to CO, CO2, SO2, NH3, methanol, ethanol, benzene, toluene and xylenes.

A Novel Ammonia Sensor Utilizing Cataluminescence on Nano-TiW3Cr2O14

2011 ◽  
Vol 694 ◽  
pp. 184-188 ◽  
Author(s):  
Kao Wen Zhou ◽  
Zi Qiao Zhang ◽  
Li Jing Xing ◽  
Xin Li ◽  
Chun Xue Fu
Keyword(s):  
Detection Limit ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Ammonia Sensor ◽  
On Line ◽  
Versus Concentration

A new sensor based on cataluminescence (CTL) produced on the surface of nanosized TiW3Cr2O14 was demonstrated for direct determination of ammonia in air. Trace ammonia was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 105°C to determine. The sensor showed high selectivity to ammonia at wavelength of 540 nm, satisfying activity at temperature of 275°C and good stability at air carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of ammonia was 1.0~50 mg/m3 (γ=0.9990), and the detection limit (3σ) was 0.5 mg/m3. The recovery of artificial sample was 97.45%—102.73% by this method. There was no response to benzene, SO2, CO and formaldehyde, and insignificant response to ethanol. This gas sensor allows on-line monitoring of ammonia in air.

A Rapid and Sensitive Ether Sensor Utilizing Thermal Desorption Coupled with Cataluminescence

2013 ◽  
Vol 641-642 ◽  
pp. 238-241 ◽  
Author(s):  
Zhi Gang Cui ◽  
Shao Tong Zhang ◽  
Jin Zhao ◽  
Kao Wen Zhou
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Versus Concentration

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Y2Zr1.5O6 as a probe was proposed for direct determination of ether in air. Trace ether was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 65°C to determine. The sensor showed high selectivity to ether at wavelength of 510nm, satisfying activity at temperature of 310°C and good stability at carrier flow rate of 110 ml/min. The linear range of CTL intensity versus concentration of ether was 2~100 mg/m3, and the detection limit (3σ) was 1.1 mg/m3. The recovery of artificial sample was 95.4%—106.7% by this method. The response to formaldehyde, benzene, NH3 and ethanol was insignificant, and there was no response to SO2, CO and acetone. The technique is a convenient and fast way of determining ether in air.

scholarly journals Effects of ink characteristics and piezo-electric inkjetting parameters on lysozyme activity

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Tuser T. Biswas ◽  
Junchun Yu ◽  
Vincent A. Nierstrasz
Keyword(s):  
Ionic Strength ◽  
Critical Micelle Concentration ◽  
Inkjet Printing ◽  
Effective Viscosity ◽  
Room Temperature ◽  
Lysozyme Activity ◽  
Ionic Surfactant ◽  
Novel Applications ◽  
Printing Parameters ◽  
Ink Formulation

AbstractInkjet printing of enzymes can facilitate many novel applications where a small amount of materials need to be deposited in a precise and flexible manner. However, maintaining the satisfactory activity of inkjet printed enzyme is a challenging task due to the requirements of ink rheology and printhead parameters. Thus to find optimum inkjetting conditions we studied the effects of several ink formulation and jetting parameters on lysozyme activity using a piezoelectric printhead. Within linear activity range of protein concentrations ink containing 50 µg/mL lysozyme showed a satisfactory activity retention of 85%. An acceptable activity of jetted ink was found at pH 6.2 and ionic strength of 0.06 molar. Glycerol was found to be an effective viscosity modifier (10–15 mPa.s), humectant and protein structure stabilizer for the prepared ink. A non-ionic surfactant when used just below critical micelle concentration was found to be favourable for the jetted inks. An increase in activity retention was observed for inks jetted after 24 hours of room temperature incubation. However, no additional activity was seen for inkjetting above the room temperature. Findings of this study would be useful for formulating other protein-based inks and setting their inkjet printing parameters without highly compromising the functionality.

A Rapid and Sensitive Acetone Gas Sensor Utilizing Thermal Desorption Coupled with Cataluminescence on Nano-Cr4TiO8

2012 ◽  
Vol 468-471 ◽  
pp. 217-220 ◽  
Author(s):  
Kao Wen Zhou ◽  
Xin Li ◽  
Di Su ◽  
Hui Zhu Yang ◽  
Xu Shen
Keyword(s):  
Detection Limit ◽  
Gas Sensor ◽  
Thermal Desorption ◽  
Flow Rate ◽  
Active Carbon ◽  
Room Temperature ◽  
High Selectivity ◽  
Direct Determination ◽  
Versus Concentration

A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Cr4TiO8 as a probe was proposed for direct determination of acetone in air. Trace acetone was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 84°C to determine. The sensor showed high selectivity to acetone at wavelength of 430nm, satisfying activity at temperature of 366°C and good stability at carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of acetone was 2.5~150 mg/m3, and the detection limit (3σ) was 1.2 mg/m3. The recovery of artificial sample was 94.1%—106.2% by this method. The response to formaldehyde and ethanol was insignificant, and there was no response to SO2, CO and benzene.

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

Sign in / Sign up

Export Citation Format

Share Document