Catherine Kamal

Negative Intrinsic Viscosity in Graphene Nanoparticle Suspensions Induced by Hydrodynamic Slip

Adyant Agrawal, Catherine Kamal, Simon Gravelle, Lorenzo Botto

The viscosity of nanoparticle suspensions is always expected to increase with particle concentration. However, a growing body of experiments on suspensions of atomically thin nanomaterials such as graphene contradicts this expectation. Some experiments indicate effective suspension viscosities below that of pure solvent …

de, us, gb, ca, fr, nl (code pays fourni par la source)

Slender body theory for ultrathin plates in two-dimensional viscous flow

Giulia Salussolia, Catherine Kamal

Modelling ultrathin platelike particles in viscous flow is notoriously difficult due to the influence of their edges. This work introduces a two-dimensional slender body theory that bypasses these complexities by systematically excluding edge effects. Derived from the boundary integral formulation of Stokes …

cl, gb (code pays fourni par la source)

Effect of thermal fluctuations on the average shape of a graphene nanosheet suspended in a shear flow

Simon Gravelle, Catherine Kamal, Lorenzo Botto

fr, gb, nl (code pays fourni par la source)

Flow and rheology of suspensions of two-dimensional cylindrical or anisotropic particles with Navier slip

Catherine Kamal, Lorenzo Botto

Through boundary integral simulations, we investigate, in the creeping flow limit and in the absence of Brownian noise, the effects of Navier slip on the orientational dynamics and effective shear viscosity of a semidilute suspension of two-dimensional particles with either circular or …

gb, nl (code pays fourni par la source)

The effect of Navier slip on the rheology of a dilute two-dimensional suspension of plate-like particles

Catherine Kamal, Lorenzo Botto

Through boundary integral simulations and asymptotic analysis, we investigate the effect of a finite Navier slip length on the rheological proprieties of a dilute two-dimensional suspension of plate-like particles in the creeping flow limit. Specifically, we study the effects of Navier slip, …

gb, nl (code pays fourni par la source)

Resistive-force theory of slender bodies in viscosity gradients

Catherine Kamal, Eric Lauga

In many natural settings, spatial variations in a fluid's viscosity arise due to changes in its local physico-chemical environment. We consider the low-Reynolds-number dynamics of slender bodies in fluids with a linearly varying viscosity. Assuming the spatial change in viscosity to be …

gb (code pays fourni par la source)

Simulation of interacting elastic sheets in shear flow: Insights into buckling, sliding, and reassembly of graphene nanosheets in sheared liquids

Giulia Salussolia, Catherine Kamal, Jason Stafford, Nicola M. Pugno et autres

In liquid-based material processing, hydrodynamic forces are known to produce severe bending deformations of two-dimensional (2D) materials such as graphene. The non-linear rotational and deformation dynamics of these atomically thin sheets is extremely sensitive to hydrodynamic particle-particle interactions. To investigate this problem, …

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Viscous peeling of a nanosheet

Adyant Agrawal, Simon Gravelle, Catherine Kamal, Lorenzo Botto

Combining molecular dynamics (MD) and continuum simulations, we study the dynamics of propagation of a peeling front in a system composed of multilayered graphene nanosheets completely immersed in water. Peeling is induced by lifting one of the nanosheet edges with an assigned …

gb, nl (code pays fourni par la source)

Alignment of a flexible platelike particle in shear flow: Effect of surface slip and edges

Catherine Kamal, Simon Gravelle, Lorenzo Botto

Rigid plate-like particles displaying interfacial slip can attain a constant orientation in a shear flow when the slip length is sufficiently large. But actual thin particles such as single-layer graphene are prone to bending deformations when exposed to shear stress. To study …

gb, nl (code pays fourni par la source)

Effect of hydrodynamic slip on the rotational dynamics of a thin Brownian platelet in shear flow

Catherine Kamal, Simon Gravelle, Lorenzo Botto

The classical theory by Jeffery predicts that, in the absence of Brownian fluctuations, a thin rigid platelet rotates continuously in a shear flow, performing periodic orbits. However, a stable orientation is possible if the surface of the platelet displays a hydrodynamic slip …

gb, nl (code pays fourni par la source)

Violations of Jeffery's theory in the dynamics of nanographene in shear flow

Simon Gravelle, Catherine Kamal, Lorenzo Botto

By using molecular dynamics simulations we demonstrate that at high P\'eclet numbers a nanographene suspended in a shear flow aligns at a constant orientation angle, in contrast with the rotary motion predicted by Jeffery's theory. This instantaneous alignment with the flow of …

gb (code pays fourni par la source)

Viscous peeling of a graphene sheet

Adyant Agrawal, Simon Gravelle, Catherine Kamal, Lorenzo Botto