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(a) Photo showing freshly prepared 0.01 wt % GO dispersions by mixing aqueous GO stock solution with acetone. From left to right, the volume fractions of acetone are 0, 10, 30, 50, 70, and 90 vol %. (b) All of the samples exhibit obvious birefringence when viewed through a pair of cross-polarizers (directions marked by white arrows). Strong birefringence is also observed for all of the samples after the sheets were sedimented.
