Depletion forces induce visco-elasto-capillary thinning of non-Brownian suspensions

• Published in: Europhysics letters Vol. 114; no. 5; p. 58006
• Main Authors: Harich, R., Deblais, A., Colin, A., Kellay, H.
• Format: Journal Article
• Language: English
• Published: Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.06.2016; IOP Publishing; European Physical Society / EDP Sciences / Società Italiana di Fisica / IOP Publishing
• Subjects: 82.70.Kj; 83.50.Jf; 83.80.Rs; Addition polymerization; Attraction; Condensed Matter; Depletion; Droplets; Drops (liquids); Dynamics; Filaments; Fluid dynamics; Liquid bridges; Liquids; Physics; Polymers; Soft Condensed Matter; Suspension bridges; Thinning; Three dimensional printing; Extensional flow and combined shear and extension; Polymer solutions; Emulsions and suspensions
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/0295-5075/114/58006

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.