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. 2016 Aug 24;6:31885. doi: 10.1038/srep31885

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Polarizing optical images obtained from liquid crystal cells with planar boundary conditions, filled with (GO-A) + 5CB mixtures at concentrations of 0.4, 0.6, 0.8, 1.0, 2.0 and 3.0 wt.%. Bright areas (inside the circle) indicate an undisturbed liquid crystal director orientation while darker areas show graphene oxide aggregates. The rubbing direction (blue arrow) is aligned at 45° to the crossed polarizers (crossed green arrows). (b) The bottom image is for a GO-A + 5CB filled cell at concentration 0.4 wt.% with the director parallel to one of the polarizers. One can clearly see remains of liquid crystal regions (black), surrounded by graphene oxide aggregates with a highly distorted director field. An equivalent behaviour is observed for the other samples.