Parametric scheme for rapid nanopattern replication via electrohydrodynamic instability

Abstract

1/τm-dependent electrohydrodynamic replication of a hexagonally ordered hole array nanopattern by adjusting the filling ratio. As the 1/τm increases, the morphology evolves into the perfectly replicated hole features with increasing filling ratio.

Electrohydrodynamic Nanopatterning: A Novel Solvent-Assisted Technique for Unconventional Substrates

“…In this study, the time-scale parameter, 1/τ m , was adjusted as a parametric guide to control the growth velocity. As previously reported, − 1/τ m not only indicates the growth velocity of the EHD-induced structure but also strongly affects the feature uniformity over the entire surface of the film in a facile and controllable manner (Experimental Section). To describe the degree of growth velocity, τ 0 /τ m was introduced, where the value of 1/τ 0 was defined as 0.346 s –1 .…”

“…Figure a shows the structured area with columnar-shaped features having a typical diameter of 1–3 μm. The structured film area was extended to the area of the top electrode (2 × 2 cm 2 ) by increasing τ 0 /τ m from 0.419 – 6.709 because the fast structure growth permits a broader range of valid parameters for a large-scale structure formation. − After EHD-induced structure formation, the sample was dipped into cyclohexane for 11 s to selectively and partially remove the PS thin film. One edge of the sample was dipped into a water bath to initiate water permeation through the PS–substrate interface.…”

Pattern formation in thin polymeric films via electrohydrodynamic patterning

“…In addition, increasing the pattern growth velocity not only shortens the patterning time but also exhibits enhanced scalability for replicating small and geometrically diverse features. 72 …”

Study on the Formation and Controllable Movement of Polymer Liquid Columns Based on Dynamic Control of Spatial Electric Field Distribution

“…Since that electrowetting manipulation and movement/deformation of liquids can be driven only through the change or adjustment of the electrical signals, it exhibits very extraordinary high research value and attracts much research interest. − It was discovered that dielectric liquid is unstable in the electric field generated by two parallel electrodes for a long time. , Dielectric liquid can be pulled into the air gap of two parallel electrodes when a voltage is applied to both electrodes. − A large number of scholars have studied the use of this phenomenon to liquid films unstable and have prepared various polymer array microstructures, such as some circular arrays . Hwang et al fabricate periodic line microstructures at the submicron scale. , Vespini et al produced various microlens arrays . However, during the preparation process of these microstructures, the entire upper substrate is the same electrode, forming a fixed-shaped microstructure in which morphology and movement cannot be controlled in real-time, and the liquid rise height is only at the micrometer level.…”