Effect of head-group size of some tetradecylalkylammonium bromide surfactants on obtaining the lyotropic biaxial nematic phaseErol Akpinar, Emre Guner, Oznur Demir-Ordu and Antônio Martins Figueiredo NetoEur. Phys. J. E, 42 4 (2019) 44DOI: https://doi.org/10.1140/epje/i2019-11806-y