Solvation dynamics and rotational relaxation of coumarin 153 in mixed micelles of Triton X-100 and cationic gemini surfactants: effect of composition and spacer chain length of gemini surfactants

2016 ◽  
Vol 18 (3) ◽  
pp. 1551-1563 ◽  
Author(s):  
Sonu Sonu ◽  
Sunita Kumari ◽  
Subit K. Saha
Keyword(s):  
Chain Length ◽  
Gemini Surfactant ◽  
Mixed Micelles ◽  
Gemini Surfactants ◽  
Rotational Relaxation ◽  
Solvation Dynamics ◽  
Cationic Gemini Surfactants ◽  
Coumarin 153 ◽  
Spacer Chain Length ◽  
Triton X

To demonstrate simultaneously how the solvation dynamics and rotational relaxation in nonionic micelles change with the composition of a gemini surfactant and how this change depends on spacer chain length of gemini surfactants.

scholarly journals Effect of Urea on Solvation Dynamics and Rotational Relaxation of Coumarin 480 in Aqueous Micelles of Cationic Gemini Surfactants with Different Spacer Groups

ACS Omega ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 3079-3095 ◽  
Author(s):  
Sunita Kumari ◽  
Sonu ◽  
Sayantan Halder ◽  
Rishika Aggrawal ◽  
Ganapathisubramanian Sundar ◽  
...  
Keyword(s):  
Gemini Surfactants ◽  
Rotational Relaxation ◽  
Solvation Dynamics ◽  
Cationic Gemini Surfactants ◽  
Aqueous Micelles

Surface Activity Research of Cationic Gemini Surfactants

2013 ◽  
Vol 690-693 ◽  
pp. 2076-2080
Author(s):  
Zhen Zhong Fan ◽  
Lan Lan Li ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Surface Activity ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ph Value ◽  
Inorganic Salts ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants

Cationic Gemini surfactant concentration, the inorganic salts added and the pH value of surface tension obtained cationic gemini surfactant critical micelle concentration is 0.4mmol / L;by adding three kinds of inorganic salts NaCl, MgCl2, and Na2SO4 ,which Na2SO4 has the greatest impact on surface tension, followed by MgCl2.The surface minimum tension of the pH ranged from 9 to 11 , indicating that the surface activity of cationic gemini surfactants achieved the highest.

scholarly journals Can the Isothermal Calorimetric Curve Shapes Suggest the Structural Changes in Micellar Aggregates?

2020 ◽  
Vol 21 (16) ◽  
pp. 5828
Author(s):  
Katarzyna Łudzik ◽  
Sebastian Woloszczuk ◽  
Wojciech Zając ◽  
Monika Jazdzewska ◽  
Andrey Rogachev ◽  
...  
Keyword(s):  
Structural Changes ◽  
Gemini Surfactants ◽  
Point Of View ◽  
Titration Calorimetry ◽  
Colloidal Systems ◽  
Micellar Aggregates ◽  
Cationic Gemini Surfactants ◽  
Scanning Transmission ◽  
Spacer Chain Length ◽  
Calorimetric Curve

Inspired by the unusual shapes of the titration curve observed for many surfactants and mixed colloidal systems, we decided to extend the analysis to isothermal titration calorimetric curves (ITC) by paying special attention to potential structural changes in micellar aggregates. In this paper, we used isothermal titration calorimetry in conjunction with Scanning Transmission Electron Microscopy (STEM), Small-Angle Neutron Scattering (SANS) and X-ray Scattering (SAXS) methods support by Monte Carlo and semiempirical quantum chemistry simulations to confirm if the isothermal calorimetric curve shape can reflect micelle transition phenomena. For that purpose, we analysed, from the thermodynamic point of view, a group of cationic gemini surfactants, alkanediyl-α,ω-bis(dimethylalkylammonium) bromides. We proposed the shape of aggregates created by surfactant molecules in aqueous solutions and changes thereof within a wide temperature range. The results provide evidence for the reorganization processes and the relationship (dependence) between the morphology of the created aggregates and the conditions such as temperature, surfactant concentration and spacer chain length which affect the processes.

scholarly journals Surface tension study of cationic gemini surfactants binding to DNA

2014 ◽  
Vol 12 (5) ◽  
pp. 577-585 ◽  
Author(s):  
Martin Pisárčik ◽  
Ferdinand Devínsky
Keyword(s):  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Adsorption Behaviour ◽  
Binding Properties ◽  
Simple Method ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Methylene Groups ◽  
Weak Adsorption ◽  
Surface Tension Study

AbstractBinding of cationic gemini surfactants alkanediyl-a-ω-bis(dimethyldodecylammonium bromides) with variable polymethylene spacer length ranging from 2 to 12 methylene groups to DNA in NaBr solution is investigated utilizing the tensiometry method. A simple method is presented for calculating the number of surfactant molecules bound to DNA. The results are evaluated in terms of the gemini surfactant spacer length, showing that gemini molecules with either short spacers (2 methylene groups) or long spacers are most efficiently adsorbed to DNA. A weak adsorption to DNA was found for gemini molecules with a medium spacer length (6 methylene groups in the spacer). The binding properties of cationic gemini surfactants as a function of spacer length are consistent with the results obtained by other experimental methods (dynamic light scattering measurements, fluorescence spectroscopy), indicating identical adsorption behaviour of gemini molecules as a function of the spacer length.

Sign in / Sign up

Export Citation Format

Share Document