The blistering of a viscoelastic filament of a droplet of saliva
Christian Wagner, Rainer Sattler, and Jens Eggers
TL;DR
This paper presents a fluid dynamics video demonstrating the breakup of a saliva droplet, highlighting the formation of a viscoelastic filament, blistering phenomena, and phase separation resulting in nanometer-sized biopolymer fibers.
Contribution
It provides visual evidence and analysis of the breakup process of saliva droplets, emphasizing the role of viscoelasticity and phase separation in biopolymer fiber formation.
Findings
Viscoelastic filament formation during saliva droplet breakup
Blistering behavior observed in the filament
Nanometer-sized biopolymer fibers resulting from phase separation
Abstract
A fluid dynamics video of the break up of a droplet of saliva is shown. First a viscoelastic filament is formed and than the blistering of this filament is shown. Finally, a flow induced phase separation takes place nanometer sized solid fiber remains that consist out of the biopolymers.
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Taxonomy
TopicsPickering emulsions and particle stabilization
The blistering of a viscoelastic filament
of a droplet of saliva
Christian Wagner1, Rainer Sattler1, and 2Jens Eggers
1Technical Physics, Saarland University, 66123 Saarbruecken, Germany
2School of Mathematics, University of Bristol,
University Walk, Bristol BS8 1TW United Kingdom
Abstract
A fluid dynamics video of the break up of a droplet of saliva is shown. First a viscoelastic filament is formed and than the blistering of this filament is shown. Finally, a flow induced phase separation takes place nanometer sized solid fiber remains that consist out of the biopolymers.
1 Introduction
The video shows the shadowgraph of a break-up of a capillary bridge of a droplet of saliva from a healthy donor. The droplet is placed between two steel plates that are gently drawn apart until the capillary bridge becomes unstable. The videos are rotated 90∘ to the right. In the first part, an overview is given of the formation of the elastic filament that blisters finally into a series of beads. The formation of the filament is related to the high elongational viscosity of saliva that originates from the polymeric biopolymers [1]. Second, it is shown that on the highly stretched filament a Rayleigh-Plateau like instability can grow [2]. The third part shows the final rupture of the filament. Apparently, the thin filaments that connect the remaining beads have a very high bending modulus. If they are captured on a metallic carrier it is possible tho show that they consist out of polymers only, which is shown in the fourth part of the movie.
E. Zussman, A.L. Yarin, R.M. Nagler, J. Dental Res. 86, 281 (2007) 2. 2.
R. Sattler, C. Wagner, J. Eggers, Phys. Rev. Lett. 100, 164502 (2008).