Spontaneous Ouzo Emulsions Coexist with Pre-Ouzo Ultraflexible Microemulsions

Prévost, Sylvain; Krickl, Sebastian; Marčelja, S.; Kunz, Werner; Zemb, Thomas; Grillo, Isabelle

doi:10.1021/acs.langmuir.0c02935

Cited by 25 publications

(16 citation statements)

References 53 publications

(121 reference statements)

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“…Moreover, comparing between the aggregates in the water–ethanol mixture and the previously studied aggregates in bilayer membranes ,, shows that the sponge-like structure is formed at the preliminary stage of bulk aggregation. This suggests a pathway for the formation of loose aggregates of small hydrophilic molecules that exhibit enhanced water transport once inserted into a membrane matrix. , Our numerical approach makes several quantitative predictions about the structural states of self-assembling AWCs in solution, and these hypotheses could be tested experimentally in the future …”

Section: Discussionmentioning

confidence: 94%

“…Nevertheless, it is possible to study the homogeneous liquid phase with MD simulations. In particular, one can characterize the phase diagram of the ternary systems and predict the aggregation patterns, which could be experimentally validated. , …”

Section: Introductionmentioning

confidence: 99%

“…In particular, one can characterize the phase diagram of the ternary systems and predict the aggregation patterns, which could be experimentally validated. 8,9 In this work, we performed MD simulations to study the aggregation of small amphiphilic molecules forming AWCs in a ternary mixture of water, ethanol, and solute. We address the following questions: (i) the effect of the concentration and the water−ethanol ratio on the stability and aggregation mechanism, (ii) the interplay between the solute and solvents in the aggregates, and (iii) the similarity between the aggregate structures in the ternary solution and the relaxed structures of AWCs in lipid membranes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Artificial Water Channels Form Precursors to Sponge-Like Aggregates in Water–Ethanol Mixtures

2022

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Self-assembled artificial water channels (AWCs) are reshaping current water desalination technologies. Recently, the improvements achieved by incorporating hydrophilic compounds into polyamide membranes (PA) at the interface were confirmed experimentally. However, the determination of the nanoscale structures of AWCs remains unclear. An important step in the preparation of PA membranes is the solubilization of a colloidal suspension of the solid phase in a water–ethanol mixture. We perform molecular dynamics simulations to study the nanoscale structures of AWC aggregates. We characterize the size and shape of the aggregates at several key locations in the ternary phase diagram. The role of ethanol in the formation of the interface between the solvent and the solute phase is highlighted. We found that the structure of the aggregates formed in the ternary solution resembled the disordered sponge-like structures observed when AWCs were inserted into lipid membranes. Such permeable sponge architectures allow the passage of water despite their noncrystalline organization and were previously shown to be consistent with AWC permeation measurements in membrane environments.

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Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Artificial Water Channels Form Precursors to Sponge-Like Aggregates in Water–Ethanol Mixtures

2022

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“…[36][37][38] In analogy, the droplet formation in the bulk mixtures is known as ouzo effect. [39,40] In the solvent exchange process, a one-phase ternary mixture of a good solvent, a poor solvent and an oil is replaced by the fresh poor solvent. Mixing between the ternary mixture and the fresh poor solvent leads to oil oversaturation and oil droplets nucleate and grow on the target substrate.…”

Section: Introductionmentioning

confidence: 99%

Tuning Composition of Multicomponent Surface Nanodroplets in a Continuous Flow‐In System

You

Lohse

Zhang

2021

Adv Materials Inter

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can be leveraged for speeding up chemical reactions, [14] concentrating chemicals from a sample based on partition coeffi cients. [15] Surface nanodroplets are femtoliter-scale droplets, with a height ranging from ≈5-1000 nm, formed on a target substrate. [16,17] The small volume and pinning effect around their boundary provide the stability of surface nanodroplets under the shear from the flow of an analyte or reactant solution, making surface nanodroplets suitable for rapid micro extraction [18] and droplet reactions [19] in continuous flowin systems. Recent advances in machine learning based methods may lead to rapid and automated droplet generation to establish training data for understanding dynamics of droplets consisting of complex media, [20] reaction kinetics in droplets, [21] and droplet based quantification and determination of chemical species. [22] In a variety of applications, the composition of multicomponent droplets is required to be optimized in order to achieve the desired functionality and performance of droplets. For example, in liquid-liquid extraction of chemical compounds from liquid solutions, binary droplets consisting of two solvents are used for the extraction performance which depends on the droplet composition because the solubility of a compound is different for every extractant. Binary organic droplets can be excellent media for efficient extraction of organic pollutants or drug compounds with different polarity from aqueous media at once. [23][24][25] Zhu et al. [23] used binary droplets of methylene chloride and n-hexane to extract and detect polycyclic aromatic hydrocarbons from environmental water samples down to a concentration of 2.1 ng L 1 − . Wang et al. [24] reported that the extraction efficiency of nicotine and cotinidine from urine sample was maximized when undecanol-chloroform binary droplets were used at a volumetric ratio of 1:1 with average recoveries of 91.5% and 79% for nicotine and cotinine, respectively. On the other hand, when only undecanol was used, the extraction efficiency for cotinine was less than 10% while the efficiency for nicotine reached 90%. This shows the strong influence of extractant type on the extraction performance. Thus, reliable formation of multicomponent droplets with optimized droplet composition is of high importance.Evaporation of deposited drops may be a simple approach leading to formation of nanodroplets on surfaces. However, different compounds in a droplet may lead to selective evaporation of more volatile liquid and complicated transport phenomena due to gradients in surface tension or chemical

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“…This significantly improves the lifetime of basic Ouzo emulsions (typically limited to hours, or days at most). 34 It is also noteworthy to underline the structural integrity of the NPshells even after drying, highlighted by the 3D structure shown by TEM-tomography in the ESI video. † Finally, an interesting observation is the of a hole on all shells (a few examples are highlighted in Fig.…”

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confidence: 96%

Synthesis of ultrasmall metal nanoparticles and continuous shells at the liquid/liquid interface in Ouzo emulsions

2022

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Spontaneous Ouzo Emulsions Coexist with Pre-Ouzo Ultraflexible Microemulsions

Cited by 25 publications

References 53 publications

Artificial Water Channels Form Precursors to Sponge-Like Aggregates in Water–Ethanol Mixtures

Artificial Water Channels Form Precursors to Sponge-Like Aggregates in Water–Ethanol Mixtures

Tuning Composition of Multicomponent Surface Nanodroplets in a Continuous Flow‐In System

Synthesis of ultrasmall metal nanoparticles and continuous shells at the liquid/liquid interface in Ouzo emulsions

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