Imprintable membranes from incomplete chiral coalescence

Zakhary, Mark; Gibaud, Thomas; Kaplan, C. Nadir; Barry, Evan; Oldenbourg, Rudolf; Meyer, Robert B.; Dogic, Zvonimir

doi:10.1038/ncomms4063

Cited by 33 publications

(42 citation statements)

References 49 publications

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“…It is worthwhile at this point to compare our theory with an alternative one, which we will refer to as the KM theory after its developers Kaplan and Meyer [8,42], that also produces results in very good agreement with experimental observations. First, it should be emphasized that the philosophical approaches of the two theories are different.…”

Section: Theoretical Development a Membrane Parametrization And mentioning

confidence: 84%

“…The twist associated with the membranes edge also leads to unconventional pathways of membrane coalescence [8]. As two membranes of same chirality approach each other laterally, the proximal membrane edges can partically coalesce and localize 180…”

Section: Overview Of Colloidal Membranesmentioning

confidence: 99%

“…Colloidal membranes exhibit an exceedingly rich phenomenology. They support a myriad of defects including twist domain walls and linear arrays of pores [8]. Increasing chirality induces a transition of flat 2D membranes into 1D twisted ribbons, and mixing rods of multiple lengths leads to formation of finite-sized colloidal rafts that are evocative of similar structures observed in conventional lipid bilayers [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…5(b), 5(d), and 5(e)] and twist domain wall retardance ( Fig. 8) [8,9]. Furthermore, we also discuss new predictions of our theoretical model, including how the structure of the membrane's edge depends on membrane radius (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Entropic forces stabilize diverse emergent structures in colloidal membranes

et al. 2016

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The depletion interaction mediated by non-adsorbing polymers promotes condensation and assembly of repulsive colloidal particles into diverse higher-order structures and materials. One example, with particularly rich emergent behaviors, is the formation of two-dimensional colloidal membranes from a suspension of filamentous fd viruses, which act as rods with effective repulsive interactions, and dextran, which acts as a condensing, depletion-inducing agent. Colloidal membranes exhibit chiral twist even when the constituent virus mixture lacks macroscopic chirality, change from a circular shape to a striking starfish shape upon changing the chirality of constituent rods, and partially coalesce via domain walls through which the viruses twist by 180• . We formulate an entropicallymotivated theory that can quantitatively explain these experimental structures and measurements, both previously published and newly performed, over a wide range of experimental conditions. Our results elucidate how entropy alone, manifested through the viruses as Frank elastic energy and through the depletants as an effective surface tension, drives the formation and behavior of these diverse structures. Our generalizable principles propose the existence of analogous effects in molecular membranes and can be exploited in the design of reconfigurable colloidal structures.

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Section: Theoretical Development a Membrane Parametrization And mentioning

confidence: 84%

Section: Overview Of Colloidal Membranesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entropic forces stabilize diverse emergent structures in colloidal membranes

et al. 2016

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“…Of particular interest in recent years [1][2][3][4][5][6][7][8][9][10][11] are assemblies of fd viruses in the presence of a polymer depletant which generates an attractive force between the viruses. Each virus is a rod of roughly one micron in length; the flexibility of the rods can be controlled by molecular engineering and highly monodisperse systems can be fabricated.…”

Section: Introductionmentioning

confidence: 99%

Probing a self-assembledfdvirus membrane with a microtubule

2016

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The self-assembly of highly anisotropic colloidal particles leads to a rich variety of morphologies, whose properties are just beginning to be understood. This article uses computer simulations to probe a particle-scale perturbation of a commonly studied colloidal assembly, a monolayer membrane composed of rodlike fd viruses in the presence of a polymer depletant. Motivated by experiments currently in progress, we simulate the interaction between a microtubule and a monolayer membrane as the microtubule "pokes" and penetrates the membrane face-on. Both the viruses and the microtubule are modeled as hard spherocylinders of the same diameter, while the depletant is modeled using ghost spheres. We find that the force exerted on the microtubule by the membrane is zero either when the microtubule is completely outside the membrane or when it has fully penetrated the membrane. The microtubule is initially repelled by the membrane as it begins to penetrate but experiences an attractive force as it penetrates further. We assess the roles played by translational and rotational fluctuations of the viruses and the osmotic pressure of the polymer depletant. We find that rotational fluctuations play a more important role than the translational ones. The dependence on the osmotic pressure of the depletant of the width and height of the repulsive barrier and the depth of the attractive potential well is consistent with the assumed depletion-induced attractive interaction between the microtubule and viruses. We discuss the relevance of these studies to the experimental investigations.

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