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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.31 no.1-2 (2004), pp. 68-75
Using Stroboscopic Illumination to Improve the Precision of the Bending Modulus Measurement
J. Genova1, V. Vitkova1, L. Aladgem1, P. Méléard2, M. D. Mitov1
1Laboratory of Liquid Crystals, Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
2UMR-CNRS 6052, ENSC-Rennes, avenue du General Leclerc, 35700 Rennes, France
go back1Laboratory of Liquid Crystals, Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
2UMR-CNRS 6052, ENSC-Rennes, avenue du General Leclerc, 35700 Rennes, France
Abstract. A new experimental set-up for measuring the bending elastic modulus, kc, by the analysis of thermally induced shape fluctuations of quasi spherical giant vesicles is proposed. The stroboscopic video microscopy has better time resolution than the continuous illumination video microscopy. Consequently, it is no more necessary to use a "correction factor" to account for the artifact due to the finite video camera integration time. The experimental data so obtained can be completely interpreted using only two model parameters, kc, and the dimensionless membrane tension,.