A study of α-cyclodextrin with a group of cationic gemini surfactants utilizing isothermal titration calorimetry and NMR

2006 ◽  
Vol 38 (6) ◽  
pp. 773-777 ◽  
Author(s):  
De-Zhi Sun ◽  
Xiao-Mei Qiu ◽  
Ling Li ◽  
Xi-Lian Wei ◽  
Bao-Lin Yin
Keyword(s):  
Isothermal Titration Calorimetry ◽  
Gemini Surfactants ◽  
Titration Calorimetry ◽  
Cationic Gemini Surfactants

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.

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