Chiral molecules on curved colloidal membranes

Akram, Sk Ashif; Behera, Arabinda; Sharma, Prerna; Sain, Anirban

doi:10.1039/d0sm01276a

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…Next, we investigate how membrane curvature couples to the orientation of the constituent rods with respect to the surface normal ( 45 ). We imaged catenoid-like membranes that were sparsely doped with fluorescently labeled viruses ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Controlling the shape and topology of two-component colloidal membranes

Khanra

Jia

Mitchell

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Changes in the geometry and topology of self-assembled membranes underlie diverse processes across cellular biology and engineering. Similar to lipid bilayers, monolayer colloidal membranes have in-plane fluid-like dynamics and out-of-plane bending elasticity. Their open edges and micrometer-length scale provide a tractable system to study the equilibrium energetics and dynamic pathways of membrane assembly and reconfiguration. Here, we find that doping colloidal membranes with short miscible rods transforms disk-shaped membranes into saddle-shaped surfaces with complex edge structures. The saddle-shaped membranes are well approximated by Enneper’s minimal surfaces. Theoretical modeling demonstrates that their formation is driven by increasing the positive Gaussian modulus, which in turn, is controlled by the fraction of short rods. Further coalescence of saddle-shaped surfaces leads to diverse topologically distinct structures, including shapes similar to catenoids, trinoids, four-noids, and higher-order structures. At long timescales, we observe the formation of a system-spanning, sponge-like phase. The unique features of colloidal membranes reveal the topological transformations that accompany coalescence pathways in real time. We enhance the functionality of these membranes by making their shape responsive to external stimuli. Our results demonstrate a pathway toward control of thin elastic sheets’ shape and topology—a pathway driven by the emergent elasticity induced by compositional heterogeneity.

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Section: Resultsmentioning

confidence: 99%

Controlling the shape and topology of two-component colloidal membranes

Khanra

Jia

Mitchell

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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“…The Euler-Lagrange equation for eqn (3), for a cone, is given in the Appendix (see eqn (13)). We solve the non-linear differential equation (eqn (13)) numerically, using Mathematica.…”

Section: Theory: Nematic Ordering On Cone and Cylindermentioning

confidence: 99%

“…The monolayers can exhibit different shapes and curvatures depending on the experimental conditions. 12,13 While all these examples of self-assembled chiral membranes exhibit open structures with free edges, we will focus here on closed vesicles that are more constrained (by volume and area) in adjusting their shapes such that chiral interaction energy is minimized simultaneously. It has been proposed 14,15 that such chiral lipid membranes could form spherical buds of very small sizes in the order of 50 nm, although this has not been directly verified in experiments.…”

Section: Introductionmentioning

confidence: 99%

Deformation of membrane vesicles due to chiral surface proteins

et al. 2021

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“…25 Curvature driven dynamics also play an important role in different biological processes [26][27][28] as well as in different properties of colloidal systems. [29][30][31] Three dimensional uniaxial nematics are orientationally ordered fluids, and can be characterized by the three component unit director n ˆ= (n x (x,y,z),n y (x,y,z),n z (x,y,z)), whereas the unit director of two dimensional a Centre for Condensed Matter Theory, Department of Physics, Indian Institute of nematics in a plane has two components: n ˆ= (n x (x,y),n y (x,y)). On a curved surface such as a sphere, the two dimensional nematic director lies in the local tangent plane to the sphere.…”

Section: Introductionmentioning

confidence: 99%