Surface Behavior and Thickness Measurement of Free Standing Thin Film of Liquid Crystal Compound Biphenyl (E7)


 Thin film, Biphenyl (E7), Polarizing Optical Technique, Beer-Lambert’s Law

How to Cite

Asif Siddiqui, Zaheer Uddin, & S. Naseem Shah. (2016). Surface Behavior and Thickness Measurement of Free Standing Thin Film of Liquid Crystal Compound Biphenyl (E7). Journal of Basic & Applied Sciences, 12, 118–123.


A simple experimental setup based on a polarizing optical technique is designed to find the thickness of free standing thin film of Biphenyl (E7). Monochromatic light is passed through a liquid crystal thin film in two different modes of placement. In each mode approximately 10 mg of Biphenyl is used. The films of varying area were used in this study. The thin films were highly stable and could survive more than one day. The intensity of transmitted monochromatic radiation is measured using this technique by placing thin film in horizontal and vertical modes. Using Beer-Lambert’s Law the thickness of thin film is also measured using polarizing optical technique. In both the modes (horizontal and vertical) different behaviors of thickness of thin film are observed..


Paschke A, Herbel W, Steinhart H. Determination of mono- to tetracyclic aromatic hydrocarbons in lubricating oil. Journal of High Resolution Chromatography 1992; 15: 827-833.

Boehncke A, Koennecker G, Mangelsdorf I, Wibbertmann A. CICAD6, Biphenyl, World Health Organization Geneva 1999.

Huppert HE, Simpson JE. The slumping of gravity currents. J Fluid Mech 1980; 99: 785-799.

Huh C, Scriven LE. Hydrodynamic model of a steady movement of a solid/liquid/fluid contact line. J Colloid Interface Sci 1971; 35: 85-101.

Oswald P, Pieranski P. Smectic and Columnar Liquid Crystals: Concepts and Physical Properties Illustrated by Experiments. Taylor & Francis, Boca Raton 2005.

Loudet JC, Dolganov P, Patr´?cio P, Saadaoui H, Cluzeau P. Phys Rev Lett 2011; 106: 117802.

Harth K, Schulz B, Bahr C, Stannarius R. Soft Matter 2011; 7: 7103.

Harth K, Stannarius R. Deep Holes in Free-Standing Smectic C Films. Ferroelectrics 2014; 468: 92-100.

Geminard JC, Ho?yst R, Oswald P. Meniscus and dislocations in free-standing films of smectic A liquid crystals. Phys Rev Lett 1997; 78: 1924.

Picano F, Ho?yst R, Oswald P. Coupling between meniscus and smectic-A films: circular and catenoid profiles, induced stress, and dislocation dynamics. Phys Rev E 2000; 62: 3747.

Oswald P, Picano F, Caillier F. Dislocation loop dynamics in freestanding smectic films: The role of the disjoining pressure and of the finite permeability of the meniscus. Phys Rev E 2003; 68: 061701.

Harth K, Stannarius R. Corona patterns around inclusions in freely suspended smectic films. Eur Phys J E 2009; 28: 265.

Conradi M, Ziherl P, Sarlah A, Musevi I. Colloids on free-standing smectic films. Eur Phys J E 2006; 20: 231.

Harth K, Eremin A, Stannarius R. A Gallery of Meniscus Patterns of Free-Standing Smectic Films. Ferroelectrics 2012; 431: 59.

Reynolds O. On the theory of lubrication and its application. Philos Trans R Soc London 1886; A177: 157.

Zhao S, Ma F, Song Z. Thickness-dependent structural and optical properties of sputter deposited ZrO2 films. Opt Mater 2008; 30: 910-915.

Shaaban ER, Abd El-Sadek MS, El-Hagary M, Yahia IS. Spectroscopic ellipsometry investigations of the optical constants of nanocrystalline SnS thin films. Phys Scr 2012; 86: 015702-015707.

Rodriguez J. B.S. Thesis, Semiconductor detector and optical system alignment for optical thin-film thicknesses using a modified reflectometry method, Brigham Young University—Idaho 2012.

Hore D, Jena K. A simple transmission-based approach for determining the thickness of transparent films. American Journal of Physics 2011; 79: 256-260.

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Copyright (c) 2016 Asif Siddiqui, Zaheer Uddin , S. Naseem Shah