Dipole–dipole interactions control the interfacial rheological response of cyclodextrin/surfactant solutions

Romero-Arias, J. Roberto; Luviano, Alberto S.; Costas, Marı́a Eugenia; Hernández–Machado, A.; Barrio, Rafael A.

doi:10.1039/d0sm01796e

Cited by 4 publications

(9 citation statements)

References 24 publications

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“…2 we show surface tension as function of the ratio R , obtained with the model presented in Ref. 11 and compared it with the experimental findings in Ref. 12 .…”

Section: Methodsmentioning

confidence: 79%

“…( 1 ) is where is the electrical dipole moment for complexes -CD :S, is the number of first neighbors, is the vacuum permitivity, h is the thickness of the surface layer where the dipoles are accommodated, is an effective distance between dipoles defined as , where d is the mean distance between dipoles used in Ref. 11 , in order to reproduce experimental data 12 for and ds is the element of area.…”

Section: Methodsmentioning

confidence: 99%

“…In Ref. 11 we showed that dipole–dipole interactions are responsible for the effective surface tension behavior as a function of the concentration of complexes in the bulk aqueous solution. These complexes are 2:1 entities i.e.…”

Section: Methodsmentioning

confidence: 99%

“…The surface tension is written as where is the surface tension of water, is the contribution of dipole charges on the surface and the term arises from the action of surfactant molecules concentration in the bulk . The surface tension due to charges is writen as 11 where is number of dipoles that could be accommodated on a surface layer and n is the number of moles of these dipoles.…”

Section: Methodsmentioning

confidence: 99%

“…In Ref. 11 we have studied the rheological behavior of a cyclodextrin-surfactant solution in water in the low concentration regime using the hanging drop technique as a function of the concentration. The striking increase of the viscoelastic response of this system and the unexpected variation of the surface tension when varying the composition was demonstrated to be due to the dipole–dipole interactions of the polar molecular complexes that order themselves on the surface of the droplet.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical shapes of droplets of cyclodextrin-surfactant solutions

Romero-Arias

Luviano

Costas

et al. 2022

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We present a series of experiments with droplets of aqueous cyclodextrin-surfactant solutions, in which the volume is reduced after the equilibrium spherical shape is reached. The final shape of the drop after this perturbation is found to be dependent on the concentration of inclusion complexes in the bulk of the solution. These inclusion complexes are formed by two cyclodextrin molecules and one surfactat molecule. We propose a model to describe these dynamical processes. Dipole–dipole interactions on the surface of the drop trigger a competition between water surface tension and dipole–dipole interaction energies. The results of the model reproduce the spherical and rod-like shapes found in the experiments.

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“…2 we show surface tension as function of the ratio R , obtained with the model presented in Ref. 11 and compared it with the experimental findings in Ref. 12 .…”

Section: Methodsmentioning

confidence: 79%