TY - JOUR
T1 - Evaporation-Triggered Segregation of Sessile Binary Droplets
AU - Li, Yaxing
AU - Lv, Pengyu
AU - Diddens, Christian
AU - Tan, Huanshu
AU - Wijshoff, Herman
AU - Versluis, Michel
AU - Lohse, Detlef
PY - 2018/6/1
Y1 - 2018/6/1
N2 - Droplet evaporation of multicomponent droplets is essential for various physiochemical applications, e.g. in inkjet printing, spray cooling and microfabrication. In this work, we observe and study phase segregation of an evaporating sessile binary droplet, consisting of a mixture of water and a surfactant-like liquid (1,2-hexanediol). The phase segregation (i.e., demixing) leads to a reduced water evaporation rate of the droplet and eventually the evaporation process ceases due to shielding of the water by the non-volatile 1,2-hexanediol. Visualizations of the flow field by particle image velocimetry and numerical simulations reveal that the timescale of water evaporation at the droplet rim is faster than that of the Marangoni flow, which originates from the surface tension difference between water and 1,2-hexanediol, eventually leading to segregation.
AB - Droplet evaporation of multicomponent droplets is essential for various physiochemical applications, e.g. in inkjet printing, spray cooling and microfabrication. In this work, we observe and study phase segregation of an evaporating sessile binary droplet, consisting of a mixture of water and a surfactant-like liquid (1,2-hexanediol). The phase segregation (i.e., demixing) leads to a reduced water evaporation rate of the droplet and eventually the evaporation process ceases due to shielding of the water by the non-volatile 1,2-hexanediol. Visualizations of the flow field by particle image velocimetry and numerical simulations reveal that the timescale of water evaporation at the droplet rim is faster than that of the Marangoni flow, which originates from the surface tension difference between water and 1,2-hexanediol, eventually leading to segregation.
UR - http://www.scopus.com/inward/record.url?scp=85048246307&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.224501
DO - 10.1103/PhysRevLett.120.224501
M3 - Article
VL - 120
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 22
M1 - 224501
ER -