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The LCPCF on a glass substrate with patterned electrodes and the magnification of the interface between the fluidic droplet and the LCPCF surface is exaggeratedly in the inlet. The chemical structures of LC(E7) compounds are listed as well.
(a) SEM image and (b) AFM image of LCPCF. (c) The voltage-dependent advancing angle (black dots), the voltage-dependent receding angle (red triangles), and the voltage-dependent hysteresis (gray squares) of the LCPCF. (Tcuring = 70 °C). (d) The surface free energy as a function of voltage of LCPCF (black dots) and LC molecules (pink triangles). The average tilt angle of LC molecules as a function of voltage is also shown (red squares).
(a) The experiment of measuring the surface free energy of 5CB. A water droplet was dropped on a thin layer of LC (5CB). The inlets are the top views of the water droplet and the droplet is rotated 90° under crossed polarizers. The transmissive axes of polarizer and analyzer are parallel to x-axis and y-axis, respectively. (b) The detail illustration of (a).
(a) At voltage-off state, the LC molecules are anchored among the polymer grains. (b) At voltage-on state, the LC molecules are reoriented by the electric field and the cyano groups of LC materials tilt toward the interface between the fluid and LC materials.
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