Simple and material independent method for the determination of anchoring properties of rubbed polyimide surfaces

Bharat R. Acharya, Jae-Hoon Kim, Satyendra Kumar

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A method to determine liquid crystal (LC) anchoring properties, that exploits the changes induced in a rubbed polyimide (PI) film upon exposure to linearly polarized ultra-violet light, has been devised. The width of the Gaussian PI chain distribution is determined from the measured rotation of the PI film's index ellipsoid, the long axis of which is also the LC easy axis, as a function of exposure time. A quasi-microscopic surface free energy is used to model the anchoring properties. This approach provides a simple LC material independent method for determining the LC anchoring properties.

Original languageEnglish
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume38
Issue number12 B
StatePublished - 1999 Dec 1

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polyimides
liquid crystals
ellipsoids
ultraviolet radiation
free energy

Cite this

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Simple and material independent method for the determination of anchoring properties of rubbed polyimide surfaces. / Acharya, Bharat R.; Kim, Jae-Hoon; Kumar, Satyendra.

In: Japanese Journal of Applied Physics, Part 2: Letters, Vol. 38, No. 12 B, 01.12.1999.

Research output: Contribution to journalArticle

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AU - Kim, Jae-Hoon

AU - Kumar, Satyendra

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N2 - A method to determine liquid crystal (LC) anchoring properties, that exploits the changes induced in a rubbed polyimide (PI) film upon exposure to linearly polarized ultra-violet light, has been devised. The width of the Gaussian PI chain distribution is determined from the measured rotation of the PI film's index ellipsoid, the long axis of which is also the LC easy axis, as a function of exposure time. A quasi-microscopic surface free energy is used to model the anchoring properties. This approach provides a simple LC material independent method for determining the LC anchoring properties.

AB - A method to determine liquid crystal (LC) anchoring properties, that exploits the changes induced in a rubbed polyimide (PI) film upon exposure to linearly polarized ultra-violet light, has been devised. The width of the Gaussian PI chain distribution is determined from the measured rotation of the PI film's index ellipsoid, the long axis of which is also the LC easy axis, as a function of exposure time. A quasi-microscopic surface free energy is used to model the anchoring properties. This approach provides a simple LC material independent method for determining the LC anchoring properties.

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