Monolayers, critical layers and wetting films in a liquid‐liquid‐solid system undergoing a wetting transition. Experimental study

Privat, Mireille; Amara, Mongi Ben; Hamraoui, Ahmed; Sellami, Hamid; Méar, Anne-Marie

doi:10.1002/bbpc.19940980416

Cited by 12 publications

(8 citation statements)

References 14 publications

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“…This binary fluid system has a lower critical solution temperature. For samples beginning in the single-fluid phase, lutidine adsorbs on silica surfaces leading to particle aggregation [10] [11] (in a related system lutidine layer formation has been resolved [12]). Maximum adsorption occurs from solutions containing only a small proportion of lutidine, i.e.…”

Section: Introductionmentioning

confidence: 99%

Influence of particle composition and thermal cycling on bijel formation

White¹,

Schofield²,

Binks³

et al. 2008

J. Phys.: Condens. Matter

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Abstract. Colloidal particles with appropriate wetting properties can become very strongly trapped at an interface between two immiscible fluids. We have harnessed this phenomenon to create a new class of soft materials with intriguing and potentially useful characteristics. The material is known as a bijel: bicontinuous interfacially-jammed emulsion gel. It is a colloid-stabilized emulsion with fluid-bicontinuous domains. The potential to create these gels was first predicted using computer simulations. Experimentally we use mixtures of water and 2,6-lutidine at the composition for which the system undergoes a critical demixing transition on warming. Colloidal silica, with appropriate surface chemistry, is dispersed while the system is in the single-fluid phase; the composite sample is then slowly warmed well beyond the critical temperature. The liquids phase separate via spinodal decomposition and the particles become swept up on the newly created interfaces. As the domains coarsen the interfacial area decreases and the particles eventually become jammed together. The resulting structures have a significant yield stress and are stable for many months. Here we begin to explore the complex wetting properties of fluorescently-tagged silica surfaces in water-lutidine mixtures, showing how they can be tuned to allow bijel creation. Additionally we demonstrate how the particle properties change with time while they are immersed in the solvents.

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Section: Introductionmentioning

confidence: 99%

Influence of particle composition and thermal cycling on bijel formation

White¹,

Schofield²,

Binks³

et al. 2008

J. Phys.: Condens. Matter

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“…Most of the experiments have been done on a silica sample of 0.4 g, mixed with a volume of solution of about 20 cm 3 ; that is, 0.4 × 10 17 silica particles were dispersed in a 20 cm 3 volume. It is then easy to calculate the supposed cubic volume offered to each particle and to estimate the diameter of a particle covered with one or several flat layers of DMP from the diameter of the free particle (about 15 nm) and also to calculate the distance between the surfaces of two particles (about 64 nm) …”

Section: Methodsmentioning

confidence: 99%

“…It was shown that this system exhibits demixing in the liquid phase, wetting transition , and layering-like adsorption behavior . Adsorption isotherms in concentrated solutions showed successive waves of relative adsorption, , while in diluted solutions they adopt a stairlike shape …”

Section: Theorymentioning

confidence: 98%

Experimental Evidence of Pure Layering at the Solid/Liquid Binary Mixture Interface. Silica/Water−2,5-Dimethylpyridine System

et al. 1998

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Experimental evidence is brought for layering transitions at solid (silica) surfaces in contact with liquid mixtures, i.e., first-order transitions whereby the coverage of the surface jumps by an amount equivalent to one extra monolayer of 2,5-dimethylpyridine (2,5-DMP) adsorbed from a liquid mixture with water. These jumps are similar to surface phase changes whose aspects are all shown on the adsorption isotherms: coexistence of two values of adsorption for the same bulk equilibrium composition, adsorption plateaus, persistent metastability lines, characteristic evolution of the plateau's length with temperature, and the proximity of bulk demixing. Known for gas adsorption on a solid both experimentally and theoretically, this behavior is seen for the first time at a solid−liquid interface.

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“…3a, 44°C around x 2 ϭ 0.48, waves are perfectly drawn. As a first step, the study of 2,5DMP adsorption variation along the coexistence curve versus temperature shows a discontinuous divergence of adsorption close to 46°C (9). Figure 4c is the adsorption at coexistence in the nonwetting bulk phase, ␥, whereas Fig.…”

Section: Adsorption Isothermsmentioning

confidence: 98%