Inversion of ‘dry water’ to aqueous foam on addition of surfactant

Binks, Bernard P.; Johnson, Andrew J.; Rodrigues, Jhonny A.

doi:10.1039/b914706c

Cited by 43 publications

(47 citation statements)

References 34 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental c WA results are consistent with the data reported in a recent publication also using the pendant drop method [33] as well as with the data given in the old literature where equilibrium Wilhelmy plate [9] and activity measurements were used [34]. Adsorption of SDS at the air-water interface has been simulated by Schweighofer et al [35] at the limit of low surface coverage and the results show that the surfactant chain is strongly bent and tilted, and sulfate head group and the portion of the carbon chain adjacent to the head are immersed in water.…”

Section: Adsorption Of Sds At Water-air and Solid-water Interfacessupporting

confidence: 94%

“…2 are close to the results reported in Ref. [33], although glass slides coated with dichlorodimethysilane was used as the substrate in that work instead of TEFLON-FEP in ours. On the other hand, the dodecyl chain of the surfactant was directed to the air during the SDS adsorption at the WA interface.…”

Section: Adsorption Of Sds At Water-air and Solid-water Interfacessupporting

confidence: 86%

See 1 more Smart Citation

Diffusion-controlled evaporation of sodium dodecyl sulfate solution drops placed on a hydrophobic substrate

Doğancı

Sesli

Erbil

2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Adsorption Of Sds At Water-air and Solid-water Interfacessupporting

confidence: 94%

Section: Adsorption Of Sds At Water-air and Solid-water Interfacessupporting

confidence: 86%

Diffusion-controlled evaporation of sodium dodecyl sulfate solution drops placed on a hydrophobic substrate

Doğancı

Sesli

Erbil

2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…59 Inversion from dry water to aqueous foam is possible by the addition of a charge surfactant. 60 Thus, dry water is an example of a phase inverted particle stabilized foam and these systems provide potential for controlled release of liquid and gaseous components, respectively. A discussion of the operating conditions for production of dry water for storing water, particularly for large/industrial scale production, has been given by Forny et a/.…”

Section: Dry Water and Relationship To Emulsionsmentioning

confidence: 99%

Liquid marbles: principles and applications

2011

View full text Add to dashboard Cite

The ability of particles to adhere to a fluid-fluid interface can stabilize the formation of an emulsion. When the encapsulated fluid is a liquid and the fluid in which it is immersed is air, the object formed is called a "LiquidMarble". Here we discuss how liquid marbles can be created, their fundamental properties and their transport and potential uses. We show how they arise naturally as an insect waste disposal system, from impact of droplets on powders and on hydrophobic soil, and in the mixing of particulate containing liquids. Our principal aim is to review research on macroscopic single marbles and their potential uses in sensors and droplet microfluidics. However, we also illustrate the similarity between liquid marbles, Pickering emulsions and "Dry Water", and the potential application of assemblies of liquid marbles within cosmetics and pharmaceutical formulations. Finally, we discuss how modifying the surface structure of particles and providing heterogeneous surface chemistry on particles (e.g. Janus particles) might provide new types of liquid marbles and applications.

show abstract

“…It is presumed that o/w/a powdered emulsions prepared without coalescence of inner oil droplets behave like dry water in transformed into an a/w foam as demonstrated in ref. 7. By careful selection of nanoparticles of the required wettability, oil-water and air-water interfaces can be stabilised sequentially yielding a powdered emulsion.…”

Section: Doi: 101002/adma201104089mentioning

confidence: 99%

“…[1,2] It has been shown that, for mixtures of air and water, relatively hydrophilic particles (θ < 90°) preferably form air-in-water (a/w) materials, that is aqueous foams, while relatively hydrophobic particles (θ > 90°) are required for stabilizing water-in-air (w/a) materials. [5][6][7] The w/a materials are represented by water marbles and dry water. The latter behaves like a free-flowing powder but contains a large amount of water (up to 95 wt.% relative to the total mass) as micron-sized droplets.…”

mentioning

confidence: 99%

Particle Stabilization of Oil‐in‐Water‐in‐Air Materials: Powdered Emulsions

et al. 2012

Self Cite

View full text Add to dashboard Cite

Colloidal particles can be irreversibly adsorbed at fluid interfaces, such as oil-water and air-water interfaces. The particle adsorption leads to stabilization of dispersed systems of two immiscible fluids and particle-stabilized (or Pickering) emulsions and foams can be prepared. [1][2][3][4] These materials show some unique properties as a result of adsorption of the particles at the fluid-fluid interface. One of the striking phenomena is that liquid drops can be dispersed in air with the liquid-air surfaces coated by liquid-repellent particles. When the liquid is water, a water-in-air (w/a) material, named dry water, is produced by aerating water in the presence of extremely hydrophobic silica particles. [5][6][7][8][9] The dry water is a free-flowing powder which can contain significant quantities of water as micron-sized drops. One may imagine that when particle-stabilised emulsions with water as the continuous phase, i.e., oilin-water (o/w) emulsions, are aerated with similar hydrophobic particles, the surfaces between the emulsion drops and air can be encased in the hydrophobic particles and oil-in-water-in-air (o/w/a) materials may be prepared, Figure 1a. However, the preparation requires precise tuning of both the properties of the o/w emulsions and the mixing conditions. We have stabilized o/w/a materials using colloidal particles alone and found that control of the coalescence of oil droplets in o/w emulsions on aeration is crucial in the ability to produce powdered emulsions successfully.Dispersed systems consisting of two immiscible fluids, such as emulsions and foams, are usually prepared using molecular or polymeric surfactants. Colloidal particles also act as emulsifiers and foam stabilizers by adsorbing at oil-water and airwater interfaces and forming armoured layers around drops or bubbles, respectively. [1-3] Such particle-stabilized fluid systems show outstanding stability against coalescence and disproportionation. [1,2,10] The driving force for the adsorption of particles to fluid interfaces is the free energy gain in losing an area of interface obliterated by the particles. The types of material formed depend significantly on the wettability of the particles at the interface, quantified by their three-phase contact angle, θ, measured into the water phase. [1,2] It has been shown that, for mixtures of air and water, relatively hydrophilic particles (θ < 90°) preferably form air-in-water (a/w) materials, that is aqueous foams, while relatively hydrophobic particles (θ > 90°) are required for stabilizing water-in-air (w/a) materials. [5][6][7] The w/a materials are represented by water marbles and dry water. The latter behaves like a free-flowing powder but contains a large amount of water (up to 95 wt.% relative to the total mass) as micron-sized droplets. Dry water can be used as a delivery vehicle in the cosmetics and pharmaceutical sectors but also a Ryo Murakami, * Hiroshi Moriyama, Masahiro Yamamoto, Bernard P. Binks,* and Anaïs Rocher Particle Stabilization of Oil-in-Water-in-Air M...

show abstract

Inversion of ‘dry water’ to aqueous foam on addition of surfactant

Cited by 43 publications

References 34 publications

Diffusion-controlled evaporation of sodium dodecyl sulfate solution drops placed on a hydrophobic substrate

Diffusion-controlled evaporation of sodium dodecyl sulfate solution drops placed on a hydrophobic substrate

Liquid marbles: principles and applications

Particle Stabilization of Oil‐in‐Water‐in‐Air Materials: Powdered Emulsions

Contact Info

Product

Resources

About