Electric-field-induced patterns in soft viscoelastic films: from long waves of viscous liquids to short waves of elastic solids.
We show that the electric field driven surface instability of viscoelastic films has two distinct regimes: (1) The viscoelastic films behaving like a liquid display long wavelengths governed by applied voltage and surface tension, independent of its elastic storage and viscous loss moduli, and (2) the films behaving like a solid require a threshold voltage for the instability whose wavelength always scales as approximately 4xfilm thickness, independent of its surface tension, applied voltage, loss and storage moduli. Wavelength in a narrow transition zone between these regimes depends on the storage modulus.
Arun
N
N
Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India.
Sharma
Ashutosh
A
Pattader
Partho S G
PS
Banerjee
Indrani
I
Dixit
Hemant M
HM
Narayan
K S
KS