Depletion forces induce visco-elasto-capillary thinning of non-Brownian suspensions
1 Université de Bordeaux, Laboratoire Ondes et Matière d'Aquitaine, (UMR 5798 CNRS) - 351 cours de la Libération, 33405 Talence France
2 ESPCI, CNRS, SIMM UMR 7615 - 11 rue Vauquelin, 75005 Paris, France
Received: 22 March 2016
Accepted: 15 June 2016
Droplet pinch-off, which occurs when a drop of liquid detaches from a capillary, can be strongly modified in the presence of complex fluids such as polymer solutions and suspensions giving rise to long and slender filaments that thin slowly in time. While for polymers, the molecular conformations of the molecules in the filament are responsible for such a behavior, in suspensions the mechanisms at play remain to be deciphered. Here we show, experimentally, that while liquid bridges of non-Brownian suspensions of moderate concentrations have a thinning behavior very close to that of the solvent, the addition of short-chain polymers inducing depletion attractions between the particles in the suspension changes the thinning dynamics and gives rise to exponential thinning in time. The characteristic time of this dynamics increases with polymer concentration and therefore the intensity of the depletion forces at play. The tunability of this dynamics may be important for injket and 3D printing applications where short rupture times are sought for or in other situations where drop formation has to be minimized or inhibited.
PACS: 82.70.Kj – Emulsions and suspensions / 83.80.Rs – Polymer solutions / 83.50.Jf – Extensional flow and combined shear and extension
© EPLA, 2016