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Emergence of a thread-like pattern with charged phospholipids on an oil/water interface
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View: Figures


Image of FIG. 1.
FIG. 1.

Confocal microscopic images of W/O droplets at different focal planes with compositions of (a) DOPC/Chol = 8:2, (b) DOPS/Chol = 8:2, (c) DOPS/DOPC/Chol = 4:4:2, (d) DOPS/DPPC/Chol = 4:4:2, and (e) DOPS/DOPC/Chol = 4:4:2 that aqueous solution is NaCl aq. 100 mM. These pictures were captured at around 15–30 min after the samples were prepared. All scale bars correspond to 50 μm.

Image of FIG. 2.
FIG. 2.

Time-course of the pattern on the interface of a W/O droplet at DOPS/DOPC/Chol = 4:4:2, as revealed by fluorescence microscopy. (a) (Left) Cross-sectional images of the droplet with the pattern at each time. Scale bar is 50 μm. (Right) Profiles of fluorescence intensities along the circular circumference line as depicted by the white arrow. (b) Power spectra P of fluorescence intensity vs. wave number 2π/λ.

Image of FIG. 3.
FIG. 3.

Time-course of fluorescence intensity near the interface of the droplet, measured along the radial distance. (a) Fluorescence images near the interface. Scale bar is 50 μm. (b) Change in fluorescence intensity I over time, which was evaluated as the spatial average along the circle, vs. radial distance r from the interface of the W/O droplet.

Image of FIG. 4.
FIG. 4.

(a) The results of the numerical simulation on the formation of a thread-like pattern obtained by the Monte Carlo method; (i) a thread composed of particles in early process and (ii) a branched thread-like pattern composed of coarse-grained threads in late process, after each Monte Carlo steps τ 1 and τ 2, respectively. In early process (i), we set a time-constant increase in micelles of 1 per 105 steps. Scale bars correspond to 5σ in both (i) and (ii). (b) Schematic illustration of the potential profile in Eq. (2).

Image of FIG. 5.
FIG. 5.

Schematic illustration of the mechanism of thread-like pattern formation. In Step 1, micelles in the 3D oil phase undergo random walk and gradually fall on the interface of a droplet. In Step 2, they diffuse on the 2D surface of the droplet and collide/stick with each other to form a thread-like pattern.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Emergence of a thread-like pattern with charged phospholipids on an oil/water interface