Coexistence of micelles and crystallites in solutions of potassium myristate: Soft matter vs. solid matter

Boneva, Mariana P.; Danov, Krassimir D.; Kralchevsky, Peter A.; Kralchevska, Stefka D.; Ananthapadmanabhan, K.P.; Lips, Alex

doi:10.1016/j.colsurfa.2009.06.031

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…The interfacial structure of the TAHP is most reminiscent of the crystallites formed by acid soaps . Extensive work has been performed on these systems to understand the rather complex relationship between the stoichiometry, phase behavior, and concentration dependence of the crystallite morphology. − The marked similarity in crystallite morphology variation suggests that the work presented here is complementary to the extensive body of work already performed on acid soaps.…”

Section: Resultsmentioning

confidence: 87%

Temperature- and pH-Dependent Shattering: Insoluble Fatty Ammonium Phosphate Films at Water–Oil Interfaces

Forth

French²,

Gromov

et al. 2015

Langmuir

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We study the films formed by tetradecylamine (TDA) at the water-dodecane interface in the presence of hydrogen phosphate ions. Using Fourier transform infrared spectroscopy (FTIR), interfacial shear rheology, confocal fluorescence microscopy, cryo-scanning electron microscopy (cryo-SEM), and small-angle neutron scattering (SANS), we find that between pH 5 and 8 tetradecylammonium cations bind to hydrogen phosphate anions to form needle-shaped crystallites of tetradecylammonium hydrogen phosphate (TAHP). These crystallites self-assemble into films with a range of morphologies; below pH 7, they form brittle, continuous sheets, and at pH 8, they form lace-like networks that deform plastically under shear. They are also temperature-responsive: when the system is heated, the film thins and its rheological moduli drop. We find that the temperature response is caused by dissolution of the film in to the bulk fluid phases. Finally, we show that these films can be used to stabilize temperature-responsive water-in-oil emulsions with potential applications in controlled release of active molecules.

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Section: Resultsmentioning

confidence: 87%

Temperature- and pH-Dependent Shattering: Insoluble Fatty Ammonium Phosphate Films at Water–Oil Interfaces

Forth

French²,

Gromov

et al. 2015

Langmuir

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show abstract

“…Hamilton investigated the phase diagram of the binary 1:1 potassium hydrogen oleate-water and the phase structure of the mesophases by using X-ray diffractometry both above and below T c 15 . Kralchevsky also confirmed the coexistence of a micellar aqueous solution and 1:1 acid soap crystals below T c in the potassium myristate-water system through conductivity and surface tension measurements 16,17 .…”

Section: Introductionmentioning

confidence: 77%

“…This isotropic aqueous solution was referred to as a micellar solution. Kralchevsky reported the coexistence of micelles and acid soap crystallites in a KC 14 aqueous solution below T c , while no micelles formed in sodium myristate aqueous solution 17 . The solid crystal is believed to be composed that 1:1 acid soap because the 21 and Goddard 11 .…”

Section: Effect Of the Addition Of Glycerolmentioning

confidence: 99%

Stability Conditions and Mechanism of Cream Soaps: Role of Glycerol

Sagitani

2014

J. Oleo Sci.

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“…In these three polyol systems, the existence of two phases of anhydrous 1:1 KHC 14 crystals and an isotropic micellar solution formed in the system of higher neutralized KHC 14 was considered from the both results of the phase diagrams and the X-ray diffractograms. The report by Kralchevsky supports that the coexistence of surfactant micelles and acid-soap crystallites in solutions of potassium myristate 15,16 .…”

Section: Discussionmentioning

confidence: 76%