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Lattice-patterned LC-polymer composites containing various nanoparticles as additives

Title
Lattice-patterned LC-polymer composites containing various nanoparticles as additives
Author(s)
Sim, KyoseungSung, Shi JoonJung, Eun-AeSon, Dae HoKim, Dae HwanKang, Jin KyuCho, Kuk Young
DGIST Authors
Sim, KyoseungSung, Shi JoonJung, Eun-AeSon, Dae HoKim, Dae HwanKang, Jin KyuCho, Kuk Young
Issued Date
2012-01
Type
Article
Article Type
Article
ISSN
1556-276X
Abstract
In this study, we show the effect of various nanoparticle additives on phase separation behavior of a lattice-patterned liquid crystal [LC]-polymer composite system and on interfacial properties between the LC and polymer. Lattice-patterned LC-polymer composites were fabricated by exposing to UV light a mixture of a prepolymer, an LC, and SiO2 nanoparticles positioned under a patterned photomask. This resulted in the formation of an LC and prepolymer region through phase separation. We found that the incorporation of SiO2 nanoparticles significantly affected the electro-optical properties of the lattice-patterned LC-polymer composites. This effect is a fundamental characteristic of flexible displays. The electro-optical properties depend on the size and surface functional groups of the SiO2 nanoparticles. Compared with untreated pristine SiO2 nanoparticles, which adversely affect the performance of LC molecules surrounded by polymer walls, SiO2 nanoparticles with surface functional groups were found to improve the electro-optical properties of the lattice-patterned LC-polymer composites by increasing the quantity of SiO2 nanoparticles. The surface functional groups of the SiO2 nanoparticles were closely related to the distribution of SiO2 nanoparticles in the LC-polymer composites, and they influenced the electro-optical properties of the LC molecules. It is clear from our work that the introduction of nanoparticles into a lattice-patterned LC-polymer composite provides a method for controlling and improving the composite's electro-optical properties. This technique can be used to produce flexible substrates for various flexible electronic devices.
URI
http://hdl.handle.net/20.500.11750/5369
DOI
10.1186/1556-276X-7-46
Publisher
Springer
Related Researcher
  • 성시준 Sung, Shi-Joon 에너지융합연구부
  • Research Interests Compound Semiconductor Materials & Processes
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Appears in Collections:
Division of Energy Technology 1. Journal Articles

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