Tuning intermicellar potentials through adsorbed molecules: van der Waals and Coulombic contributions

Manohar, C.; Kelkar, V. K.; Mishra, Bijaya Kumar; Rao, K. Srinivasa; Goyal, P. S.; Dasannacharya, B.A.

doi:10.1016/0009-2614(90)85245-8

Cited by 12 publications

(17 citation statements)

References 16 publications

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“…However, the structural changes of nonionic micelles in the presence of hydrophobic salts or hydrotropes that are adsorbed on the surface of micelles have not been studied extensively. The effect of salicylic acid on the structure of Triton X-100 micelles has been investigated by SANS [3,4]. The aim of this study is to show the pH-induced changes in the surface charge of nonionic micelles.…”

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confidence: 99%

Tuning intermicellar potential of Triton X-100-anthranilic acid mixed micelles

et al. 2008

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Structural parameters of micelles formed by Triton X-100 in the presence of solubilized anthranilic acid at different pH values was investigated using light scattering and small angle neutron scattering. Analysis of the SANS data indicate that micelles are oblate ellipsoidal in nature with little variation in the dimensions, in the investigated pH range (from 0.5 to 6.0). The interaction potential of the micelles shows a minimum closer to the isoelectric point of anthranilic acid. A similar variation is observed in the cloud point of the micelles with pH. The observed variation in the interaction potential with pH of the micellar solution can be explained in terms of the reversal of charge on anthranilic acid due to shift in the acid-base equilibrium. The variation in interaction potential and cloud point with pH is modelled using Coulombic repulsion of charged molecules at the micelle interface.

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Section: Introductionmentioning

confidence: 99%

Tuning intermicellar potential of Triton X-100-anthranilic acid mixed micelles

et al. 2008

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“…In an attempt to test this conjecture and to find a suitable remedy, we have, in this paper, designed SANS experiments to investigate the nonionic-to-ionic-micelle transition where the Coulomb potential is continuously raised from zero to a finite value. The main motivation for these studies came from some of the recent studies on mixed micelles [11,12]. Several experiments on clouding of mixed nonionicionic surfactants indicated that the Coulomb and the attractive interactions can be tuned to vary the cloud points [11].…”

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“…The main motivation for these studies came from some of the recent studies on mixed micelles [11,12]. Several experiments on clouding of mixed nonionicionic surfactants indicated that the Coulomb and the attractive interactions can be tuned to vary the cloud points [11]. Attempts to interpret these results indicated that the value of the intermicellar potential at the hard core is decisively the most important parameter responsible for the phenomenon of clouding [12].…”

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“…A solution of 8 wt. % Triton-X 100 (corresponding to 0.127M) was investigated by SANS [11]and the aggregation number was found to be 95. The amount of SDS added was guided by using this aggregation number.…”

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“…The data of Ref. [11],for Triton-X 100 and salicylic acid, are recalculated using the present model. The improvements over the earlier fits [11] Fig.…”

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See 2 more Smart Citations

Transition from a nonionic to an ionic micelle

Kelkar¹,

Mishra²,

Rao³

et al. 1991

Phys. Rev. A

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The present paper was motivated by an attempt to understand the transition from a nonionic to an ionic micelle from both the experimental and theoretical points of view. Small-angle neutron-scattering experiments were performed on mixed micelles of nonionic-ionic surfactants as the charge was increased in steps. Evidence for the charge condensation on the surface of the micelles is obtained. An extension of the sticky-hard-sphere model to include the Coulomb potentials is presented and used to analyze experimental results on two systems. It is concluded that this model is more appropriate than the currently used models. PACS number(s): 82.70.Dd, 64.10.+ h, 64.60.Ht

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Surfactants: materials for interface design and spontaneous formation of structures

Manohar

1994

Bull. Mater. Sci.

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This paper mostly describes the research on surfactant solutions performed at this centre in the past few years. A correlation between mieroemulsion structure and precipitation reaction of AgC1 is described. Experimental and theoretical research culminating in the development of a theme for analysing the structure of colloidal systems is described. Recent results on the discovery of new viscoelastic surfactant systems are presented.

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Tuning intermicellar potentials through adsorbed molecules: van der Waals and Coulombic contributions

Cited by 12 publications

References 16 publications

Tuning intermicellar potential of Triton X-100-anthranilic acid mixed micelles

Tuning intermicellar potential of Triton X-100-anthranilic acid mixed micelles

Transition from a nonionic to an ionic micelle

Surfactants: materials for interface design and spontaneous formation of structures

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