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Comparison of two different indentation techniques in studying the in-situ viscoelasticity of the liquid crystal

Soon, Chin Fhong and Kian, Sek Tee and Mansour Youseffi, Mansour Youseffi and Morgan Denyer, Clive Thomas (2015) Comparison of two different indentation techniques in studying the in-situ viscoelasticity of the liquid crystal. In: Advanced Research in Material Sciences, Manufacturing, Mechanical and Mechatronic Engineering Technology International Conference (AR4MET 2015), 2-4 June 2015, Bali, Indonesia.

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Abstract

Liquid crystal is a new emerging biomaterial. The physical properties of liquid crystal plays a role in supporting the adhesion of cells. Nano and microball indentation techniques were applied to determine the elastlc modulus or viscoelasticity of the cholesteryl ester l~qu~d crystals in the culture media. Nano-indentation results (108 k 19.78 kPa. N = 20) agreed well with the microball indentation (1 10 * 19.95 kPa, N = 60) for the liquid crystal samples incubated for 24 hours at 370C, respectively. However, nanoindentation could not measure the modulus of the liqu~d crystal (LC) incubated more than 24 hours. This is due to the decreased viscosity of the liquid crystal after immersion in the cell culture media for more than 24 hours. Alternatively, microball indentation was used and the elastic modulus of the LC immersed for 48 hours was found to decrease to 55 ? 9.99 kPa (N = 60). The microball indentation ind~catedth at the LC did not creep afler 40 seconds of indentation. However, the elastic modulus of the LC was no longer measurable after 72 hours of incubation due to the lost of elasticity. Microball indentation seemed to be a reliable technique in determining the elastic moduli of the cholesteryl ester liquid crystals

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Electrical and Electronic Engineering > Department of Electronic Engineering
Depositing User: Mrs. Nurhayati Ali
Date Deposited: 12 Aug 2015 02:35
Last Modified: 12 Aug 2015 02:35
URI: http://eprints.uthm.edu.my/id/eprint/6990
Statistic Details: View Download Statistic

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