TY - JOUR
T1 - Biaxially Morphing Droplet Shape by an Active Surface
AU - Wang, Ding
AU - Liu, Yingzhi
AU - Sridhar, Sreepathy
AU - Li, Yifan
AU - McHale, Glen
AU - Lu, Haibao
AU - Yu, Ziyi
AU - Wang, Steven
AU - Xu, Ben Bin
N1 - Funding Information: D.W. and Y.L. contributed equally to this work. The work was supported by the Engineering and Physical Sciences Research Council (EPSRC) grant-EP/N007921 and EP/L026899, Royal Society research grant-RG150662 and Kan Tong Po International Fellowship 2019-KTP\R1\191012. D.W. and B.B.X. thank Reece Innovation for the studentship support.
PY - 2021/1/22
Y1 - 2021/1/22
N2 - Drop morphology can be manipulated by designing localized solid/liquid interactions to create a favorable interfacial energy equilibrium. A topographical surface with hierarchical roughness can be harnessed to generate complex drop morphologies, enhance uniaxial and anisotropic spreading, in a designable fashion. Here, using an active surface is proposed with a responsive roughness (wrinkle patterns) under uniaxial compression/stretching, to morph droplet shape biaxially in a continuous and reversible manner. The keys to achieve biaxial drop shaping are the in‐plane confinement from lattice hole patterns and the programmable formation of roughness, to pin and guide contact line movement in both in plane directions. The complex interplay between wetting and the patterns is elucidated by both experiments and numerical analysis. The results enrich the current understanding of shaping droplets by managing the contact line pinning/movement on an engineered elastic substrate, and providing insights for emerging applications in the areas such as droplet emicrofluidics, liquid robotics, ink‐jet printing, 3D printing and healthcare.
AB - Drop morphology can be manipulated by designing localized solid/liquid interactions to create a favorable interfacial energy equilibrium. A topographical surface with hierarchical roughness can be harnessed to generate complex drop morphologies, enhance uniaxial and anisotropic spreading, in a designable fashion. Here, using an active surface is proposed with a responsive roughness (wrinkle patterns) under uniaxial compression/stretching, to morph droplet shape biaxially in a continuous and reversible manner. The keys to achieve biaxial drop shaping are the in‐plane confinement from lattice hole patterns and the programmable formation of roughness, to pin and guide contact line movement in both in plane directions. The complex interplay between wetting and the patterns is elucidated by both experiments and numerical analysis. The results enrich the current understanding of shaping droplets by managing the contact line pinning/movement on an engineered elastic substrate, and providing insights for emerging applications in the areas such as droplet emicrofluidics, liquid robotics, ink‐jet printing, 3D printing and healthcare.
KW - droplet shaping
KW - elastic instability
KW - surface wetting
KW - wrinkling
UR - http://www.scopus.com/inward/record.url?scp=85089977139&partnerID=8YFLogxK
U2 - 10.1002/admi.202001199
DO - 10.1002/admi.202001199
M3 - Article
VL - 8
SP - 1
EP - 7
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
SN - 2196-7350
IS - 2
M1 - 2001199
ER -