Thin Liquid Crystal Film for Corrosion Sensing

Abstract:

The anchoring energy of Liquid Crystals (LCs) is influenced by several parameters. Many scientists have exploited LCs anchoring in order to develop several LC based optical sensors. This paper proposes and proves a new principle of operation for corrosion sensing based on the anchoring energy of liquid crystals. For the work of this paper 5CB (4-cyano-4-n-pentylbiphenyl) nematic LCs were used to coat iron substrates forming films of about 7µm thickness. Both corroded and non-corroded iron substrates were coated and the differences in LC anchoring between the two substrates are reported. These differences were studied experimentally using the atomic force microscope (AFM) and the laser profilometer.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 477-480
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.477
• Online since: July 2008
• Authors: F. Kossivas, Andreas Kyprianou

References

[1] Peter J. Collings and Michael Hird, Introduction to Liquid Crystals, Chemistry and Physics, Taylor and Francis, Third Edition, (2004).

[2] Tomasz R. Woli´nski, Aleksandra Jarmolik, and Wojtek J. Bock, Development of Fiber Optic Liquid Crystal Sensor for Pressure Measurement, IEEE Transactions on Instrumentation and Measurement, 48(1), 1999, 1-6.

DOI: 10.1109/19.755041

[3] Byoungho Lee, Yoonchan Jeong, Seungin Baek, Hak-Rin Kim, Yonghyun Kim, Yong Wook Lee, and Sin-Doo Lee, Electromagnetic Field Sensing Using Liquid Crystal Optical Fibers, Optical Fiber Sensors Conference Technical Digest, 2, 2002, 403-406.

DOI: 10.1109/ofs.2002.1000648

[4] Hak-Rin Kim, Eunje Jang, and Sin-Doo Lee, Electrooptic Temperature Sensor Based on a Fabry-Pérot Resonator With a Liquid Crystal Film, IEEE Photonics Technology Letters, vol. 18, 2006, no. 8.

DOI: 10.1109/lpt.2006.872279

[5] T. J. Sluckin Anchoring transitions at liquid crystal intrerfaces, Physica A, 213, 1995, pp.105-109.

[6] Y. Hayashi, M. Masuda, J. Lee, M. Kojima, Study on corrosion properties of sputter coating of oxides on stainless steels, Materials Science and Engineering, A 198, 1995, 71-74.

DOI: 10.1016/0921-5093(95)80060-8

[7] M. G. Tomilin, S. A. Povzun, A. F. Kurmashev, E. V Gribaniva and T. A. Efimova, The application of nematic liquid crystals for objective microscopic diagnosis of cancer, Liquid Crystals Today, 10(2), 2001, 3-5.

DOI: 10.1080/14645180110074819

[8] M. Benounis, N. Jaffrezic, Elaboration of an optical fibre corrosion sensor for aircraft applications, Sensors and Actuators B 100, 2004, 1-8.

DOI: 10.1016/j.snb.2003.12.075

[9] S.A. Wade, C.D. Wallbrink, G. McAdam, S. Galea, B.R.W. Hinton, R. Jones, A fibre optic corrosion fuse sensor using stressed metal-coated optical fibres, Sensors and Actuators B , Article in press, (2008).

DOI: 10.1016/j.snb.2007.12.056