Fig. 1 Lipid and nanoparticle segregation at the cholesteric liquid crystal–water interface. Lipid and nanoparticle segregation at the cholesteric liquid.

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Presentation transcript:

Fig. 1 Lipid and nanoparticle segregation at the cholesteric liquid crystal–water interface. Lipid and nanoparticle segregation at the cholesteric liquid crystal–water interface. (A) Cholesterics (gray) must twist along the surface to have as much homeotropic anchoring as possible from the presence of lipids in the surrounding water phase. The hydrophobic tails of the lipids prefer the liquid crystal phase, causing liquid crystal molecules to lie parallel to the tail and thus perpendicular to the interface. Twist regions with molecules tangent to the interface exclude traditional, molecular surfactants, such as lipids (red). (B) Laser scanning confocal microscopy data of lipids (TR-DLPC, red) at the cholesteric-water interface demonstrate segregation of the lipids into stripes that follow the underlying cholesteric order. As lipid concentration increases (i to iii), surface stripes become wider and more disordered (ii) until twist regions are forced away from the surface as a result of the lipids saturating the interface (iii). (C) Surfactant-decorated nanoparticles, made surface active from the electrostatic grafting of molecular surfactants to the nanoparticle surface, are also found to align with molecules perpendicular to the interface, forming patterned assemblies. (D) Projections of laser scanning confocal microscopy z stacks of nanoparticles (green) on cholesteric droplets demonstrate how nanoparticles surface modified by surfactants can follow the underlying cholesteric patterning at the cholesteric-water interface. Electrostatic surface functionalization allows flexible surface chemistry. The data show that amine-functionalized silica nanoparticles, which have positive surface charge, now become surface active after modification by negatively charged surfactant, SOS. Increasing the SOS concentration to obtain nanoparticles with sufficiently negative zeta potentials is needed for the particles to segregate into stripes (iii). Numbers on the upper right corners of micrographs are system zeta potential measurements. Scale bars, 50 μm. Lisa Tran et al. Sci Adv 2018;4:eaat8597 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).