Scattering approach for fluctuation-induced interactions at fluid interfaces

Noruzifar, Ehsan; Wagner, Jef; Zandi, Roya

doi:10.1103/physreve.88.042314

Cited by 14 publications

(11 citation statements)

References 40 publications

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“…Although the ratio of the many-body contribution to the sum of the pairwise forces is calculated to be negligible at large separations, it reaches a factor of 2 at small separations and therefore strengthens the attraction. 46 , 47 …”

Section: Discussionmentioning

confidence: 99%

Mechanism of Shiga Toxin Clustering on Membranes

et al. 2016

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The bacterial Shiga toxin interacts with its cellular receptor, the glycosphingolipid globotriaosylceramide (Gb3 or CD77), as a first step to entering target cells. Previous studies have shown that toxin molecules cluster on the plasma membrane, despite the apparent lack of direct interactions between them. The precise mechanism by which this clustering occurs remains poorly defined. Here, we used vesicle and cell systems and computer simulations to show that line tension due to curvature, height, or compositional mismatch, and lipid or solvent depletion cannot drive the clustering of Shiga toxin molecules. By contrast, in coarse-grained computer simulations, a correlation was found between clustering and toxin nanoparticle-driven suppression of membrane fluctuations, and experimentally we observed that clustering required the toxin molecules to be tightly bound to the membrane surface. The most likely interpretation of these findings is that a membrane fluctuation-induced force generates an effective attraction between toxin molecules. Such force would be of similar strength to the electrostatic force at separations around 1 nm, remain strong at distances up to the size of toxin molecules (several nanometers), and persist even beyond. This force is predicted to operate between manufactured nanoparticles providing they are sufficiently rigid and tightly bound to the plasma membrane, thereby suggesting a route for the targeting of nanoparticles to cells for biomedical applications.

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Section: Discussionmentioning

confidence: 99%

Mechanism of Shiga Toxin Clustering on Membranes

et al. 2016

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“…This procedure, however, often generates many-body forces, beyond the linear superposition of basic pairwise forces. This kind of nonadditivity is present in various systems such as colloidal suspensions [1][2][3][4][5][6][7][8], systems governed by quantum-electrodynamic Casimir forces [9][10][11][12][13][14], polymers [15][16][17][18][19], granular systems [20][21][22], nematic colloids [23], and noble gases or nanoparticles with van der Waals forces acting among them [24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Three-body critical Casimir forces

2015

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Within mean-field theory we calculate universal scaling functions associated with critical Casimir forces for a system consisting of three parallel cylindrical colloids immersed in a near-critical binary liquid mixture. For several geometrical arrangements and boundary conditions at the surfaces of the colloids we study the force between two colloidal particles in the direction normal to their axes, analyzing the influence of the presence of a third particle on that force. Upon changing temperature or the relative positions of the particles we observe interesting features such as a change of sign of this force caused by the presence of the third particle. We determine the three-body component of the forces acting on one of the colloids by subtracting the pairwise forces from the total force. The three-body contribution to the total critical Casimir force turns out to be more pronounced for small surface-to-surface distances between the colloids as well as for temperatures close to criticality. Moreover, we compare our results with similar ones for other physical systems such as three atoms interacting via van der Waals forces.

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“…[20,21] and references therein). More recently, motivated by the possibility that the lipid mixtures composing biological membranes are poised at criticality [22,23], it has been proposed that inclusions (such as proteins) on such membranes are subject to 2D analogs of critical FIF [24].…”

mentioning

confidence: 97%

“…Two dimensional (2D) membranes have provided yet another arena for investigation of FIF, mostly focused on interactions arising due to modifications of capillary fluctuations (see, e.g. [15,16] and references therein). More recently, motivated by the possibility that the lipid mixtures composing biological membranes are poised at criticality [17,18], it has been proposed that inclusions (such as proteins) on such membranes are subject to 2D analogs of critical FIF [19].…”

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confidence: 99%

Reversing the critical Casimir force by shape deformation

2015

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The exact critical Casimir force between periodically deformed boundaries of a 2D semi-infinite strip is obtained for conformally invariant classical systems. Only two parameters (conformal charge, dimension of a boundary changing operator), along with the solution of an electrostatic problem, determine the Casimir force, rendering the theory practically applicable to any shape. The attraction between any two mirror symmetric objects follows directly from our general result. The possibility of purely shape induced reversal of the force, as well as occurrence of stable equilibrium is demonstrated for certain conformally invariant models, including the tricritical Ising mode

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Scattering approach for fluctuation-induced interactions at fluid interfaces

Cited by 14 publications

References 40 publications

Mechanism of Shiga Toxin Clustering on Membranes

Mechanism of Shiga Toxin Clustering on Membranes

Three-body critical Casimir forces

Reversing the critical Casimir force by shape deformation

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