Abstract
Carbon nanotubes (CNTs) coated by a poly(vinylpyrrolidone) (PVP) layer were doped in bistable cholesteric liquid crystal (ChLC) film to provide electric, thermal, or optical erasability controllable films. The CNT/PVP formed a compatible NIR-absorbing film that can generate heat to switch ChLC film from a planar texture to a focal conic texture. The appropriate content of CNT/PVP is provided to achieve a fast thermal response, satisfactory dispersion, and clear display brightness. The ChLC film containing CNT/PVP @ 0.8 (wt.%) saves 51% time at thermal erasing, compared to the ChLC mixture without NIR absorbent. The hybrid organic–inorganic bistable ChLC material reported here extends and offers new applications of ChLC writing tablets.
Highlights
Cholesteric liquid crystal (ChLC)-based reflex displays are being widely applied in the electronic paper area, owing to paper-like reflectance, flexibility, bistability, and energy efficiency [1–10]
Schneider reported a reflective bistable ChLC containing a malleable touch-sensitive writing tablet where ChLC was sealed between two polyethylene terephthalate substrates, and both substrates were coated with conductive polymers [24]
LC samples were injected into traditional indium tin oxide (ITO) glass cells to observe morphological and optical characteristics and into poly(ethylene terephthalate) (PET)/ITO glass cells to study the thermal erasing performance
Summary
Cholesteric liquid crystal (ChLC)-based reflex displays are being widely applied in the electronic paper area, owing to paper-like reflectance, flexibility, bistability, and energy efficiency [1–10]. When pressure is applied on the surface of the writing board, ChLC orientation transforms the focal conic texture into a planar reflective texture, and the tablet is displayed. An AC electric field is applied on the writing board, ChLC orientation transforms the planar reflective texture into focal conic texture, the incident light does not reflect, and the display image is erased. The most important challenge for the ChLC handwriting tablet is that users hope to clear part of the writing content To solve this problem, we introduce near-infrared (NIR) absorbent nanoparticles into the existing LC handwriting board. Coating the CNT surface with PVP reduced the incorporation percentage of CNT into the LCand mixture due to the presence of amide in the PVP layer
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