Depletion forces in thin liquid films due to nonionic and ionic surfactant micelles

Kralchevsky, Peter A.; Danov, Krassimir D.; Anachkov, Svetoslav E.

doi:10.1016/j.cocis.2014.11.010

Cited by 29 publications

(15 citation statements)

References 50 publications

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“…While the layering phenomenon is maximally prominent in a neat liquid of spherical molecules, the magnitude of the force modulation is now a function of concentration for dissolved spherical particles. 45,46 In agreement with theory, Richetti et al observed in a system with dissolved monodisperse spherical micelles in the SFA that an increasing micellar volume fraction in the solution resulted in more and stronger oscillations in the force profile due to the layering. 47 A similar trend was observed for mixtures of water and a protic ionic liquid by Horn and Israelachvili.…”

Section: Discussionsupporting

confidence: 80%

Stepwise collapse of highly overlapping electrical double layers

Zachariah

Espinosa‐Marzal

Spencer

et al. 2016

Phys. Chem. Chem. Phys.

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When two charged surfaces and their accompanying electrical double layers (EDLs) approach each other in an electrolyte solution, the EDLs first begin to overlap and finally collapse under confinement. During this collapse we can observe repulsive forces and film-thickness transitions, which contain valuable information about different structural elements present at the interface. Sensing and discriminating these transitions by size and frequency of occurrence is possible via direct force measurements. Changing salt concentration or pH provide additional means to shift chemical potentials and interfacial populations, and therefore also to shift the relative stability of these structural elements. We provide new evidence that the previously observed oscillatory surface force appearing at the final stages of collapse of the EDL is initially due to layering transitions between hydrated ions, which then develop into smaller transitions between highly confined adsorbed ion states.

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Section: Discussionsupporting

confidence: 80%

Stepwise collapse of highly overlapping electrical double layers

Zachariah

Espinosa‐Marzal

Spencer

et al. 2016

Phys. Chem. Chem. Phys.

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“…Triggered by the capabilities of replicating the naturally occurring structures, researchers attempt to fabricate surfaces that can have controllable bubble adhesion behavior. Understanding of air bubble behavior on solid surfaces is of paramount importance by taking into consideration of the vastness of its applications in diverse fields, which includes microfluidics, heat exchangers, boilers, enhanced oil recovery, froth floatation, drag reduction, mining, foams, emulsions, biomedical, industry, drug delivery, fuel cells, implanted sensors, chemical reactors, nuclear reactors, biotechnology, waste water treatment, de‐inking of waste paper …”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Fabricating Superaerophobic and Superaerophilic Surfaces

George

Chidangil

George

2017

Adv Materials Inter

102

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In spite of large amount of research in fabricating surfaces of varying wettability by biomimicking the naturally occurring surfaces, the work on fundamentally and industrially important air bubble adhesion on solid surfaces and its applications are still in the burgeoning stage. The present progress report provides a discussion and a critical evaluation of the recent literature available on the fabrication of superaerophilic/superaerophobic surfaces via synergic modification of surface topography and surface chemistry. An abridge on the physics behind bubble wetting on a solid in a liquid medium is deciphered here, considering the interfacial surface tension balance at the three‐phase contact line, Laplace pressure, hydrostatic pressure, and surface forces, respectively. Emphasis is made on the advancement in micro/nanofabrication technologies to fabricate surfaces that break the conventional wisdom of complementary behavior of water and air bubble contact angles. The progress report presented here also shines light on the mechanism of air bubble dynamics on solid surfaces and the latest developments in achieving surfaces of varied air bubble adhesion and its applications. Finally, the prospects of the superaerophobic and superaerophilic surfaces in the near future together with the challenges faced in accomplishing them are also insinuated.

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“…As demonstrated by Moncho-Jordá and Odriozola [13], the effective wall-wall interactions are notably influenced by the nature of the particle-particle and particle-wall interactions. (ii) Extension of the theory to higher concentrations of the smaller particles (the depletant), at which the interaction force oscillates with the surface-to-surface distance, so that the depletion force is identified with the first minimum of the oscillatory structural force at small distances [11,14]. A general analytical expression for calculating the structural and depletion forces at various concentrations of hard spheres has been derived by Trokhymchuk and Henderson [14].…”

mentioning

confidence: 98%

“…The invited review by Harries and Sapir [9] disentangles the deep link between enthalpy/entropy compensation and depletion, along with the approach well detailed by Dill and Bromberg in their classical and extremely pedagogic textbook [10]. The effects of soft electrostatic particle/particle and particle/wall interactions on the depletion force have been investigated both experimentally and theoretically [11]. Image-charge effects and saltingout phenomena have been studied by Curtis and Lue [12].…”

mentioning

confidence: 99%

“…This approach allows a very detailed analysis of surface layering of nonionic and charged micelles. Quantitative check of prediction of the effect of depletion force on the disjoining pressure can be obtained, and last but not least, counting of the micelles present per unit area for different thicknesses of a thin liquid film gives a clever and independent measurement of aggregation numbers, once the cmc is known, as shown by K. Danov and coauthors [11]. (iii) New aspects of the depletion surface force related to mixed dispersions of two and multiple depletants are reviewed by Ji and Walz [16].…”

mentioning

confidence: 99%

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