The cause of accelerated desorption of sparingly soluble dodecanol monolayers: Convection or leakage?

Minkov, I.; Dimitrova, Iglika M.; Arabadzhieva, D.; Mileva, Elena; Slavchov, Radomir I.

doi:10.1016/j.colsurfa.2021.127414

Colloids and Surfaces A: Physicochemical and Engineering Aspect

2021

DOI: 10.1016/j.colsurfa.2021.127414

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The cause of accelerated desorption of sparingly soluble dodecanol monolayers: Convection or leakage?

I. Minkov

Iglika M. Dimitrova

D. Arabadzhieva

et al.

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2024

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Cited by 1 publication

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Measuring the Equilibrium Spreading Pressure—A Tale of Three Amphiphiles

Peychev,

Arabadzhieva,

Minkov

et al. 2024

Molecules

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A surfactant’s equilibrium spreading pressure (ESP) is the maximum decrease in surface tension achievable at equilibrium below the Krafft point. Difficulties in measuring the ESP have been noted previously but no well-established experimental protocols to overcome them exist. We present a case study of three solid amphiphiles with different propensities to spread on the air–water interface. Starting with the partially water soluble n-dodecanol (C12H25OH), which spreads instantaneously. The strong Marangoni flows associated with the spreading result in the dislocating of the Wilhelmy plate or crystals attaching to it. A temporary mechanical barrier in front of the spreading crystals mitigates the flows disturbing the plate. Presaturating the subphase with the amphiphile prevents the establishment of dynamic steady states, reduces the standard error by a factor of three and causes faster equilibration. The perfluoroalkylated analog of dodecanol (11:1 fluorotelomer alcohol, C11F23CH2OH) is slow spreading. With surfactant crystals on the interface, the surface pressure reaches a pre-equilibrium plateau within an hour, followed by equilibration on day-long timescales. We show that it is better to estimate the ESP by averaging the values of multiple pre-equilibrium plateaus rather than waiting for equilibrium to be established. Finally, the nonspreading amphiphile DPPC exhibits a large barrier for the mass transfer from the DPPC crystal to the aqueous surface. This was overcome by introducing a volatile, water-immiscible solvent deposited on the surface next to the crystals to facilitate the spreading process and leave behind a monolayer.

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Measuring the Equilibrium Spreading Pressure—A Tale of Three Amphiphiles

Peychev,

Arabadzhieva,

Minkov

et al. 2024

Molecules

View full text Add to dashboard Cite

show abstract

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The cause of accelerated desorption of sparingly soluble dodecanol monolayers: Convection or leakage?

Cited by 1 publication

References 37 publications

Measuring the Equilibrium Spreading Pressure—A Tale of Three Amphiphiles

Measuring the Equilibrium Spreading Pressure—A Tale of Three Amphiphiles

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