Droplet durotaxis on very soft substrates (Manchester)

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Droplet durotaxis on very soft substrates
Prof Anne Juel, Manchester Centre for Nonlinear Dynamics,
University of Manchester, UK
(anne.juel@manchester.ac.uk)
The spreading of liquid droplets on stiff, flat surfaces is governed by the
contact angle. In equilibrium, a small droplet takes the shape of a spherical
cap with uniform contact angle θ determined by Young’s law:
γLV cos θ =γSV −γSL, where the indices L, S, and V for the interfacial energies
γ, refer to liquid, solid, and vapor, respectively. Recent experiments have
shown that on soft substrates, the apparent contact angle varies with droplet
size and substrate stiffness. This is because a partially-wetting liquid can
deform the underlying elastic substrate upon which it rests. Hence,
modulations in the substrate stiffness can lead to spontaneous droplet motion
– a simple mechanical analogue of durotaxis by which numerous types of
cells show a remarkable ability to detect and move along gradients in
stiffness of an underlying substrate.

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