Droplets of structured fluid on a flat substrate
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- Droplets of structured fluid on a flat substrate
- Kim, Jaeup U.; Matsen, Mark W.
- AB diblock copolymers; Droplet shape; Equilibrium morphology; Flat substrates; Integer numbers; Internal structure; Lamellar layers; Self-consistent-field theory; Simple fluids; Spherical droplets; Spherical shape; Structured fluids; Substrate affinity; Top surface
- Issue Date
- ROYAL SOC CHEMISTRY
- SOFT MATTER, v.5, no.15, pp.2889 - 2895
- We study the equilibrium morphology of droplets of symmetric AB diblock copolymer on a flat substrate. Using self-consistent field theory (SCFT), we provide the first predictions for the equilibrium droplet shape and its internal structure. When the substrate affinity for the A component, eta(A), is small, the droplet adopts a nearly spherical shape much like that of simple fluids. Inside the spherical droplet, however, concentric circular lamellar layers stack on top of each other; hence the thickness of the droplet is effectively quantized by a half-integer or integer number of layers. At larger hA and smaller contact angle, the area of the upper-most layer becomes relatively large, resulting in a nearly flat, faceted top surface, followed by a semi-spherical slope. This geometry is remarkably reminiscent of the droplet shapes observed with smectic liquid crystals.
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