Collective stiffening of soft hair assemblies

Thomazo, Jean-Baptiste; Lauga, Eric; Révérend, Benjamin Le; Wandersman, Élie; Prevost, Alexis

doi:10.1103/physreve.102.010602

Cited by 9 publications

(6 citation statements)

References 28 publications

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“…5 papillae mm −2 ), at which non-trivial coupled elastohydrodynamic effects are likely to occur [37]. The effect of the surface density of papillae on their deflections under shear will be the core of a forthcoming paper that will address them both experimentally and theoretically [23]. This work is of relevance to the psychophysics community since it will also help to better understand the textural coding of complex fluids in the oral cavity and allow the design of future psychophysics studies associated with their soft matter physics interpretation.…”

Section: Discussionmentioning

confidence: 99%

“…These holes were distributed on a square grid with a 1 μm resolution, with a surface density of 10 holes cm −2 . With this density, hydrodynamic interactions between papillae are negligible [23]. In a third step, an isopropanol solution containing green fluorescent beads of diameter 1-5 μm (GFM, Cospheric, 1.3 g ml −1 ) at a concentration of 50 mg l −1 was poured onto the mould and left for 15 min at room temperature (figure 1b, upper panel).…”

Section: Artificial Tongue Fabricationmentioning

confidence: 99%

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Probing in-mouth texture perception with a biomimetic tongue

Thomazo

Pastenes

Pipe

et al. 2019

J. R. Soc. Interface.

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An experimental biomimetic tongue-palate system has been developed to probe human in-mouth texture perception. Model tongues are made from soft elastomers patterned with fibrillar structures analogue to human filiform papillae. The palate is represented by a rigid flat plate parallel to the plane of the tongue. To probe the behavior under physiological flow conditions, deflections of model papillae are measured using a novel fluorescent imaging technique enabling sub-micrometer resolution of the displacements. Using optically transparent newtonian liquids under steady shear flow, we show that deformations of the papillae allow determining their viscosity from 1 Pa.s down to the viscosity of water of 1 mPa.s, in full quantitative agreement with a recently proposed model [Lauga et al., Frontiers in Physics, 2016, 4, 35]. The technique is further validated for a shear-thinning and optically opaque dairy system.

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Section: Discussionmentioning

confidence: 99%

Section: Artificial Tongue Fabricationmentioning

confidence: 99%

Probing in-mouth texture perception with a biomimetic tongue

Thomazo

Pastenes

Pipe

et al. 2019

J. R. Soc. Interface.

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“…5), displaced a distance h ∼ L/2 from the surface. Near a no-slip wall, the far-field flow along x due to a force F x a distance δ upstream is simple shear [50,51],…”

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confidence: 99%

Swirling Instability of the Microtubule Cytoskeleton

Stein

Canio

Lauga

et al. 2020

Preprint

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In the cellular phenomena of cytoplasmic streaming, molecular motors carrying cargo along a network of microtubules entrain the surrounding fluid. The piconewton forces produced by individual motors are sufficient to deform long microtubules, as are the collective fluid flows generated by many moving motors. Studies of streaming during oocyte development in the fruit fly D. melanogaster have shown a transition from a spatially-disordered cytoskeleton, supporting flows with only short-ranged correlations, to an ordered state with a cell-spanning vortical flow. To test the hypothesis that this transition is driven by fluid-structure interactions we study a discrete-filament model and a coarse-grained continuum theory for motors moving on a deformable cytoskeleton, both of which are shown to exhibit a swirling instability to spontaneous large-scale rotational motion, as observed.

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“…They serve important roles in nutrient absorption [4,5], surface protection and flow control [6][7][8][9], surface adhesion [1, [10][11][12], and fluid entrainment [3,13,14]. They function as mechanosensors, detecting fluid flows [2,7,[15][16][17][18][19], predators [20,21], and electric fields [22].…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow Induced Deformation of a Boundary Hair

Smucker¹,

M.²,

Alvarado³

et al. 2022

Preprint

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The deformation of a dense carpet of hair due to Stokes flow in a channel can be described by a nonlinear integro-differential equation for the shape of a single hair, which possesses several solutions for a given choice of parameters. While being posed in a previous study and bearing resemblance to the pendulum problem from mechanics, this equation has not been analytically solved until now. Despite the presence on an integral with a nonlinear functional dependence on the dependent variable, the system is integrable. We compare the analytically obtained solution to a finite-difference numerical approach, identify the physically realizable solution branch, and briefly study the solution structure through a conserved energy-like quantity. Time-dependent fluid-structure interactions are a rich and complex subject to investigate and we argue that the solution discussed herein can be used as a basis for understanding these systems.

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Collective stiffening of soft hair assemblies

Cited by 9 publications

References 28 publications

Probing in-mouth texture perception with a biomimetic tongue

Probing in-mouth texture perception with a biomimetic tongue

Swirling Instability of the Microtubule Cytoskeleton

Fluid Flow Induced Deformation of a Boundary Hair

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