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1. F. Castles, S. M. Morris, and H. J. Coles, “The limits of flexoelectricity in liquid crystals,” AIP Advances. 1, 032120 (2011).
2. J. Harden, B. Mbanga, N. Eber, K. Fodor-Csorba, S. Sprunt, J. T. Gleeson, and A. Jakli, “Giant flexoelectricity of bent-core nematic liquid crystals,” Phys Rev Lett. 97, 157802 (2006).
3. R. B. Meyer, “Piezoelectric Effects in Liquid Crystals,” Phys Rev Lett. 22, 918921 (1969).
4. W. Helfrich, “Inherent Bounds to Elasticity and Flexoelectricity of Liquid-Crystals,” Mol Cryst Liq Cryst. 26, 15 (1974).
5. J. Prost and P. S. Pershan, “Flexoelectricity in Nematic and Smectic-a Liquid-Crystals,” J Appl Phys. 47, 22982312 (1976).
6. S. A. Pikin, Structural transformations in liquid crystals (Gordon and Breach Science Publishers. xii, New York, 1991), p. 423.

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In their paper, using the principle of energy conservation, F. Castles, S. M. Morris, and H. J. Coles [AIP Advances1, 032120 (Year: 2011)]10.1063/1.3624725 establish inequalities involving the elastic and dielectric constants and flexoelectric coefficients of liquid crystals. They then argue that recently measured values of flexoelectric coefficients by Harden et al. do not obey these inequalities, hence they violate the principle of energy conservation. In this comment, we point out that in their calculation, Castles et al. use an inappropriate value for an elastic constant, hence their conclusions, predicated on the outcome of this calculation, are not justified.


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